EML1-related Ribbon-like Subcortical Heterotopia

Mendelian MONDO:0020491 Pathograph 10 Show in embeddings browser congenital nervous system disorder disorder of development or morphogenesis hereditary neurological disease

EML1-related ribbon-like subcortical heterotopia (EML1-associated brain overgrowth syndrome) is a rare autosomal recessive malformation of cortical development caused by biallelic loss-of-function variants in EML1, which encodes Echinoderm microtubule-associated protein-like 1 (EMAP-1), a microtubule-associated protein of the EMAP family. EML1 is required in apical radial glia (aRG) for normal microtubule dynamics, centrosome and primary cilium integrity, and mitotic spindle length and orientation. Loss of EML1 function perturbs these progenitor microtubule mechanisms, causing apical radial glia to delaminate and become abnormally positioned away from the ventricular zone. These ectopic progenitors continue to proliferate within the cortical wall and generate neurons that are produced and retained ectopically, giving rise to a strikingly specific imaging signature of megalencephaly with bilateral giant ribbon-like subcortical heterotopia, partial or complete agenesis of the corpus callosum, and an overlying polymicrogyria-like cortical malformation. Affected individuals present with severe developmental delay, drug-resistant epilepsy and visual impairment, and hydrocephalus is seen in a substantial fraction. The mechanism is a primary progenitor (centrosome / spindle / cilium) defect rather than a postmitotic neuronal migration defect: neuronal migration speed per se is normal, and the migration disturbance is secondary to loss of the normal radial glial scaffold. This distinguishes the disorder mechanistically from the classical subcortical band heterotopia of DCX / PAFAH1B1 (a microtubule-dependent neuronal migration defect) and from FLNA periventricular nodular heterotopia (an apical-junction/actin defect), justifying a distinct entry built on the neural-progenitor centrosome/spindle skeleton.

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1
Inheritance
5
Pathophys.
14
Phenotypes
1
Gaps
10
Pathograph
1
Genes
2
Medical Actions
6
References
1
Deep Research
👪

Inheritance

1
Autosomal recessive inheritance HP:0000007
Autosomal recessive inheritance
Show evidence (1 reference)
PMID:31710781 SUPPORT Human Clinical
"From review of the clinical and imaging data of eight individuals from five families with biallelic EML1 variants, a very consistent imaging phenotype emerges"
The human cohort reports affected individuals from multiple families with biallelic EML1 variants, supporting autosomal recessive inheritance.
?

Discussions and Knowledge Gaps

1
Which EML1 progenitor defects are conserved between mouse cortical heterotopia models and human iPSC-derived cerebral organoids, and which disease branches depend on human-specific basal radial glia, extracellular matrix, or OSVZ-like biology?
HUMAN MODEL MISMATCH OPEN gap_eml1_mouse_organoid_translatability
Attached to
pathophysiology#Centrosome, Cilium and Mitotic Spindle Perturbation in Apical Radial Glia pathophysiology#Apical Radial Glia Delamination and Ectopic Progenitors pathophysiology#Ectopic Neurogenesis and Cortical Neuron Misplacement pathophysiology#Ribbon-like Subcortical Heterotopia and Brain Overgrowth
Mouse HeCo, knockout and conditional Eml1 models establish the conserved centrosome/cilium/spindle lesion and in vivo microtubule-rescue effect, but human cerebral organoids add disease-specific evidence for ectopic neural rosettes, heterotopic neuron clusters, basal radial glial marker expansion and human-specific extracellular matrix signatures. The open question is whether these organoid phenotypes are direct consequences of the same EML1-centrosome lesion or a human-amplified OSVZ/oRG branch that is only partly represented in lissencephalic rodent cortex.
Proposed experiments
EML1 isogenic organoid microtubule and YAP1 rescue panel
isogenic cerebral organoid rescue assay
exp_eml1_isogenic_organoid_microtubule_yap1_rescue
Compare patient-derived EML1 organoids, CRISPR-corrected isogenic organoids and knock-in mutant controls, with orthogonal rescue arms that restore microtubule formation or dampen YAP1-triggered expansion. Quantify centrosome/cilium integrity, spindle orientation, radial-glial delamination, ectopic rosette formation, basal radial glial markers, extracellular matrix programs and heterotopic neuron clusters.
Model systems
Human iPSC-derived cerebral organoid EML1 model
Patient-derived or genome-edited human cerebral organoids carrying EML1 loss-of-function or patient missense variants, with matched isogenic corrected controls.
ORGANOID namo:Organoid link
human NCBITaxon:9606
cerebral cortex UBERON:0000956
radial glial cell CL:0000681 neural progenitor cell CL:0011020
Perturbations
EML1 variant correction or knock-in
pathophysiology#EML1 Loss of Function and Microtubule Dysregulation
Correct patient EML1 variants or introduce matched variants into control iPSCs to separate causal EML1 effects from donor background.
Microtubule formation rescue
pathophysiology#Apical Radial Glia Delamination and Ectopic Progenitors
Test whether the mouse in vivo microtubule-rescue effect also rescues human organoid radial-glial delamination and ectopic rosette formation.
YAP1 pathway dampening
pathophysiology#Ectopic Neurogenesis and Cortical Neuron Misplacement
Perturb the organoid YAP1 expansion branch to test whether it is necessary for ectopic progenitor expansion and heterotopic neuron clusters downstream of EML1 loss.
Readouts
Progenitor architecture and heterotopic neuron output
pathophysiology#Ribbon-like Subcortical Heterotopia and Brain Overgrowth
Quantify ectopic neural rosettes, basal radial glial markers, extracellular matrix programs and heterotopic neuron clusters across mutant, corrected and rescue conditions.
immunostaining single-cell transcriptomic profiling
Direction: POSITIVE
Controls
Isogenic corrected organoids
Matched organoids in which the EML1 variant is corrected.
Isogenic knock-in organoids
Wild-type-background organoids carrying introduced EML1 variants.
Decision criterion
A conserved EML1-centrosome skeleton is supported if variant correction or microtubule rescue normalizes both mouse and organoid progenitor delamination readouts. A human-specific branch is supported if organoid basal radial glial, extracellular-matrix or YAP1 phenotypes persist as separable outputs not captured by the mouse model.
Would support
pathophysiology#Apical Radial Glia Delamination and Ectopic Progenitors pathophysiology#Ectopic Neurogenesis and Cortical Neuron Misplacement
Show evidence (2 references)
PMID:35289477 SUPPORT In Vitro
"The lack of human-specific models hampers our understanding of the molecular underpinnings of the intricate processes leading to MCD."
Supports treating mouse-to-human translatability as an explicit knowledge gap for EML1-linked malformations of cortical development.
PMID:35289477 SUPPORT In Vitro
"Single-cell RNA sequencing shows an upregulation of basal radial glial (RG) markers and human-specific extracellular matrix components in the ectopic cell population."
Supports a human organoid branch involving basal radial glial and human-specific extracellular matrix programs that is not fully resolved by mouse models alone.
⚙

Pathophysiology

5
EML1 Loss of Function and Microtubule Dysregulation
Biallelic loss-of-function variants in EML1 abolish full-length EMAP-1, a microtubule-associated protein expressed in cortical apical radial glia. In the spontaneous HeCo mouse, a retrotransposon insertion eliminates full-length Eml1 transcripts, and knockdown reproduces the progenitor phenotype while re-expression rescues it, establishing EML1 loss as the initiating molecular lesion. EML1 loss perturbs microtubule dynamics in progenitor cells, the proximal cytoskeletal defect from which the centrosome, cilium and spindle abnormalities follow.
apical radial glial cell CL:0000681
microtubule cytoskeleton organization GO:0000226 ↕ DYSREGULATED
Downstream
Centrosome, Cilium and Mitotic Spindle Perturbation in Apical Radial Glia
Show evidence (2 references)
PMID:24859200 SUPPORT Model Organism
"We identified Eml1, encoding a microtubule-associated protein, as the gene mutated in HeCo mice"
Identifies Eml1 (a microtubule-associated protein) as the gene mutated in the HeCo heterotopia mouse, establishing the molecular lesion.
PMID:29229923 SUPPORT In Vitro
"MT dynamics are perturbed in mutant progenitor cells in vitro"
Demonstrates that Eml1 loss perturbs microtubule dynamics in progenitor cells, the proximal cytoskeletal defect.
Centrosome, Cilium and Mitotic Spindle Perturbation in Apical Radial Glia
Microtubule dysregulation in EML1-deficient apical radial glia disrupts the centrosome and primary cilium and abnormally elongates the mitotic spindle. Cilia are shorter, less numerous and aberrantly oriented within vesicles, and centrosomes and microtubule regrowth are impaired in both mouse mutant radial glia and human patient cells, placing the proximal lesion at the progenitor centrosome/spindle apparatus.
apical radial glial cell CL:0000681
mitotic spindle organization GO:0007052 ↕ DYSREGULATED centrosome cycle GO:0007098 ↕ DYSREGULATED cilium assembly GO:0060271 ↓ DECREASED
Downstream
Apical Radial Glia Delamination and Ectopic Progenitors
Show evidence (4 references)
PMID:29229923 SUPPORT Model Organism
"centrosome and primary cilia were altered and spindles were found to be abnormally long in HeCo progenitors"
Documents altered centrosome and primary cilia with abnormally elongated mitotic spindles in EML1-deficient progenitors.
PMID:31390572 SUPPORT Model Organism
"In HeCo aRGs, cilia are shorter, less numerous, and often found aberrantly oriented within vesicles"
Documents the primary-cilium defect in EML1-deficient apical radial glia.
PMID:39316454 SUPPORT Model Organism
"In a forebrain conditional Eml1 mutant model"
Identifies the mouse conditional Eml1 model used to show early centrosomal dysfunction.
+ 1 more reference
Apical Radial Glia Delamination and Ectopic Progenitors
Centrosome/spindle perturbation causes apical radial glia to lose their apical anchoring and delaminate from the ventricular zone, so that dividing progenitors become abnormally distributed throughout the cortical wall rather than confined to the ventricular and subventricular zones. Misplaced apical progenitors are the critical initiating event for heterotopia formation, and rescuing microtubule formation in vivo reduces both delamination and heterotopia volume, establishing the causal link.
apical radial glial cell CL:0000681 neural progenitor cell CL:0011020
establishment of mitotic spindle orientation GO:0000132 ↕ DYSREGULATED
Downstream
Ectopic Neurogenesis and Cortical Neuron Misplacement
Show evidence (4 references)
PMID:24859200 SUPPORT Model Organism
"While HeCo neurons migrated at the same speed as wild type, abnormally distributed dividing progenitors were found throughout the cortical wall from embryonic day 13"
Shows that the primary defect is abnormally distributed dividing progenitors, not slowed neuronal migration.
PMID:31390572 SUPPORT Model Organism
"In HeCo mice, some aRGs are abnormally positioned away from the ventricular zone (VZ)"
Documents delamination of apical radial glia away from the ventricular zone in the EML1-deficient cortex.
PMID:39316454 SUPPORT Model Organism
"By rescuing microtubule formation in Eml1 mutant embryonic brains, abnormal radial glia delamination and heterotopia volume were significantly reduced"
Causal rescue experiment linking microtubule-dependent radial glia delamination to heterotopia formation.
+ 1 more reference
Ectopic Neurogenesis and Cortical Neuron Misplacement
Ectopic progenitors retained within the cortical wall continue to divide and generate neurons outside their normal niche. These neurons are produced and trapped ectopically, accounting for the excessive number of cortical neurons found in the subcortical white matter rather than in the cortical plate.
neural progenitor cell CL:0011020 cortical neuron CL:0000540
neuroblast proliferation GO:0007405 ↕ DYSREGULATED
Downstream
Ribbon-like Subcortical Heterotopia and Brain Overgrowth
Show evidence (1 reference)
PMID:39316454 SUPPORT Other
"Subcortical heterotopia is a cortical malformation associated with epilepsy, intellectual disability, and an excessive number of cortical neurons in the white matter"
This background statement from a mechanistic model paper defines the heterotopia as an excess of cortical neurons retained in the white matter, the output of ectopic neurogenesis.
Ribbon-like Subcortical Heterotopia and Brain Overgrowth
The distorted progenitor output produces the characteristic malformation: bilateral megalencephaly with a giant ribbon-like subcortical heterotopia, partial or complete callosal agenesis and an overlying polymicrogyria-like cortex. EML1 mutations underlie ribbon-like heterotopia in humans, and the spindle, ectopic-progenitor and heterotopia phenotypes are linked across mouse and human.
cortical neuron CL:0000540
neuron migration GO:0001764 ⚠ ABNORMAL
Downstream
Hypotonia The severe malformation syndrome can include hypotonia on physical examination.
Spastic tetraplegia The neurodevelopmental malformation syndrome can progress to severe spastic motor impairment.
Feeding difficulties Severe neurologic impairment in the malformation syndrome can be accompanied by feeding difficulty.
Strabismus Ophthalmologic involvement can include strabismus.
Optic atrophy Ophthalmologic involvement can include optic atrophy.
Show evidence (2 references)
PMID:31710781 SUPPORT Human Clinical
"On brain imaging there is megalencephaly with a characteristic ribbon-like subcortical heterotopia combined with partial or complete callosal agenesis and an overlying polymicrogyria-like cortical malformation"
Documents the defining imaging signature of the EML1 disorder in the human cohort.
PMID:24859200 SUPPORT Human Clinical
"We further found EML1 to be mutated in ribbon-like heterotopia in humans"
Establishes EML1 mutations as the cause of human ribbon-like heterotopia.
⬡

Pathograph

Use the checkboxes to hide or show graph categories. Hover nodes for evidence and cross-linked metadata.
Pathograph: causal mechanism network for EML1-related Ribbon-like Subcortical Heterotopia Interactive directed graph showing how pathophysiology mechanisms, phenotypes, genetic factors and variants, experimental models, environmental triggers, and treatments relate through causal and linked edges.
●

Phenotypes

14
Digestive 1
Feeding difficulties Feeding difficulties HP:0011968
Show evidence (1 reference)
PMID:31710781 SUPPORT Human Clinical
"He frequently aspirated on liquids and was unable to eat solid foods."
Documents aspiration on liquids and inability to eat solid foods in an affected individual.
Eye 3
Visual Impairment Visual impairment HP:0000505
Show evidence (1 reference)
PMID:31710781 SUPPORT Human Clinical
"biallelic EML1 disease-causing variants cause a highly specific pattern of congenital brain malformations, severe developmental delay, seizures and visual impairment"
Documents visual impairment as part of the consistent EML1 clinical phenotype.
Strabismus Strabismus HP:0000486
Show evidence (1 reference)
PMID:31710781 SUPPORT Human Clinical
"Ophthalmological assessment showed strabismus and optic atrophy."
Documents strabismus in an affected individual.
Optic atrophy Optic atrophy HP:0000648
Show evidence (1 reference)
PMID:31710781 SUPPORT Human Clinical
"Ophthalmological assessment showed strabismus and optic atrophy."
Documents optic atrophy in an affected individual.
Head and Neck 1
Macrocephaly Macrocephaly HP:0000256
Show evidence (1 reference)
PMID:31710781 SUPPORT Human Clinical
"All individuals were macrocephalic (>2.5 SD)"
Captures macrocephaly as a clinical sign distinct from the imaging term megalencephaly.
Musculoskeletal 1
Hypotonia Hypotonia HP:0001252
Show evidence (1 reference)
PMID:31710781 SUPPORT Human Clinical
"Physical examination revealed macrocephaly, deformational plagiocephaly, and hypotonia."
Documents hypotonia in an affected individual with biallelic EML1 disease.
Nervous System 5
Agenesis of Corpus Callosum Agenesis of corpus callosum HP:0001274
Show evidence (1 reference)
PMID:31710781 SUPPORT Human Clinical
"combined with partial or complete callosal agenesis and an overlying polymicrogyria-like cortical malformation"
Documents partial or complete callosal agenesis in the EML1 cohort.
Polymicrogyria-like Cortical Malformation Polymicrogyria HP:0002126
Show evidence (1 reference)
PMID:31710781 SUPPORT Human Clinical
"an overlying polymicrogyria-like cortical malformation"
Documents the overlying polymicrogyria-like cortex in the EML1 cohort.
Severe Developmental Delay Severe global developmental delay HP:0011344
Show evidence (1 reference)
PMID:31710781 SUPPORT Human Clinical
"The clinical syndrome is characterized by mainly neurological features including severe developmental delay, drug-resistant seizures and visual impairment"
Documents severe developmental delay as a core clinical feature of the EML1 syndrome.
Drug-resistant Seizures VERY_FREQUENT Seizure HP:0001250
Show evidence (1 reference)
PMID:31710781 SUPPORT Human Clinical
"The clinical syndrome is characterized by mainly neurological features including severe developmental delay, drug-resistant seizures and visual impairment"
Documents drug-resistant seizures as a characteristic feature of the EML1 syndrome.
Hydrocephalus FREQUENT Hydrocephalus HP:0000238
Show evidence (1 reference)
PMID:31710781 SUPPORT Human Clinical
"hydrocephalus (in half of the cases)"
Documents hydrocephalus in approximately half of the EML1 cohort, supporting a FREQUENT band.
Other 3
Ribbon-like Subcortical Heterotopia Gray matter heterotopia HP:0002282
Show evidence (1 reference)
PMID:31710781 SUPPORT Human Clinical
"On brain imaging there is megalencephaly with a characteristic ribbon-like subcortical heterotopia combined with partial or complete callosal agenesis and an overlying polymicrogyria-like cortical malformation"
Documents the characteristic ribbon-like subcortical heterotopia in the EML1 human cohort.
Megalencephaly Megalencephaly HP:0001355
Show evidence (1 reference)
PMID:31710781 SUPPORT Human Clinical
"On brain imaging there is megalencephaly with a characteristic ribbon-like subcortical heterotopia"
Documents megalencephaly as a consistent imaging feature in the EML1 cohort.
Spastic tetraplegia Spastic tetraplegia HP:0002510
Show evidence (1 reference)
PMID:31710781 SUPPORT Human Clinical
"wheelchair dependent with spastic tetraplegia"
Documents spastic tetraplegia in an affected individual.
🧬

Genetic Associations

1
EML1 (Loss of function)
Gene: EML1 (EMAP-1) hgnc:3330
Show evidence (2 references)
PMID:24859200 SUPPORT Human Clinical
"We further found EML1 to be mutated in ribbon-like heterotopia in humans"
Founding identification of EML1 mutations as the cause of human ribbon-like heterotopia.
PMID:31710781 SUPPORT Human Clinical
"From review of the clinical and imaging data of eight individuals from five families with biallelic EML1 variants, a very consistent imaging phenotype emerges"
Confirms biallelic (recessive) EML1 variants across multiple families with a consistent phenotype.
💊

Medical Actions

2
Anti-Seizure Medication
Action: pharmacotherapy Ontology label: Pharmacotherapy NCIT:C15986
Agent: levetiracetam CHEBI:6437
Symptomatic management of the drug-resistant epilepsy associated with the EML1 syndrome using standard anti-seizure medications selected by seizure type. No disease-modifying therapy exists; management is supportive.
Supportive and Rehabilitative Care
Action: supportive care MAXO:0000950
Multidisciplinary supportive care including physical, occupational and developmental therapies for the severe developmental delay, motor impairment and visual impairment, plus neurosurgical management of hydrocephalus where present.
{ }

Source YAML

click to show 
name: EML1-related Ribbon-like Subcortical Heterotopia
creation_date: "2026-06-12T00:00:00Z"
category: Mendelian
disease_term:
  preferred_term: EML1-associated ribbon-like subcortical heterotopia
  term:
    id: MONDO:0020491
    label: subcortical band heterotopia
inheritance:
- name: Autosomal recessive inheritance
  inheritance_term:
    preferred_term: Autosomal recessive inheritance
    term:
      id: HP:0000007
      label: Autosomal recessive inheritance
  evidence:
  - reference: PMID:31710781
    reference_title: "EML1-associated brain overgrowth syndrome with ribbon-like heterotopia."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      From review of the clinical and imaging data of eight individuals from five
      families with biallelic EML1 variants, a very consistent imaging phenotype
      emerges
    explanation: >-
      The human cohort reports affected individuals from multiple families with
      biallelic EML1 variants, supporting autosomal recessive inheritance.
description: >-
  EML1-related ribbon-like subcortical heterotopia (EML1-associated brain
  overgrowth syndrome) is a rare autosomal recessive malformation of cortical
  development caused by biallelic loss-of-function variants in EML1, which
  encodes Echinoderm microtubule-associated protein-like 1 (EMAP-1), a
  microtubule-associated protein of the EMAP family. EML1 is required in apical
  radial glia (aRG) for normal microtubule dynamics, centrosome and primary
  cilium integrity, and mitotic spindle length and orientation. Loss of EML1
  function perturbs these progenitor microtubule mechanisms, causing apical
  radial glia to delaminate and become abnormally positioned away from the
  ventricular zone. These ectopic progenitors continue to proliferate within the
  cortical wall and generate neurons that are produced and retained ectopically,
  giving rise to a strikingly specific imaging signature of megalencephaly with
  bilateral giant ribbon-like subcortical heterotopia, partial or complete
  agenesis of the corpus callosum, and an overlying polymicrogyria-like cortical
  malformation. Affected individuals present with severe developmental delay,
  drug-resistant epilepsy and visual impairment, and hydrocephalus is seen in a
  substantial fraction. The mechanism is a primary progenitor (centrosome /
  spindle / cilium) defect rather than a postmitotic neuronal migration defect:
  neuronal migration speed per se is normal, and the migration disturbance is
  secondary to loss of the normal radial glial scaffold. This distinguishes the
  disorder mechanistically from the classical subcortical band heterotopia of
  DCX / PAFAH1B1 (a microtubule-dependent neuronal migration defect) and from
  FLNA periventricular nodular heterotopia (an apical-junction/actin defect),
  justifying a distinct entry built on the neural-progenitor centrosome/spindle
  skeleton.
parents:
- congenital nervous system disorder
- disorder of development or morphogenesis
- hereditary neurological disease
references:
- reference: PMID:24859200
  title: "Mutations in Eml1 lead to ectopic progenitors and neuronal heterotopia in mouse and human."
- reference: PMID:31710781
  title: "EML1-associated brain overgrowth syndrome with ribbon-like heterotopia."
- reference: PMID:39316454
  title: "Forebrain Eml1 depletion reveals early centrosomal dysfunction causing subcortical heterotopia."
- reference: PMID:29229923
  title: "Eml1 loss impairs apical progenitor spindle length and soma shape in the developing cerebral cortex."
- reference: PMID:31390572
  title: "Mutations in the Heterotopia Gene Eml1/EML1 Severely Disrupt the Formation of Primary Cilia."
- reference: PMID:35289477
  title: "Human cerebral organoids reveal progenitor pathology in EML1-linked cortical malformation."
pathophysiology:
- name: EML1 Loss of Function and Microtubule Dysregulation
  description: >-
    Biallelic loss-of-function variants in EML1 abolish full-length EMAP-1, a
    microtubule-associated protein expressed in cortical apical radial glia. In
    the spontaneous HeCo mouse, a retrotransposon insertion eliminates
    full-length Eml1 transcripts, and knockdown reproduces the progenitor
    phenotype while re-expression rescues it, establishing EML1 loss as the
    initiating molecular lesion. EML1 loss perturbs microtubule dynamics in
    progenitor cells, the proximal cytoskeletal defect from which the centrosome,
    cilium and spindle abnormalities follow.
  cell_types:
  - preferred_term: apical radial glial cell
    term:
      id: CL:0000681
      label: radial glial cell
  biological_processes:
  - preferred_term: microtubule cytoskeleton organization
    term:
      id: GO:0000226
      label: microtubule cytoskeleton organization
    modifier: DYSREGULATED
  evidence:
  - reference: PMID:24859200
    reference_title: "Mutations in Eml1 lead to ectopic progenitors and neuronal heterotopia in mouse and human."
    supports: SUPPORT
    evidence_source: MODEL_ORGANISM
    snippet: >-
      We identified Eml1, encoding a microtubule-associated protein, as the gene
      mutated in HeCo mice
    explanation: >-
      Identifies Eml1 (a microtubule-associated protein) as the gene mutated in
      the HeCo heterotopia mouse, establishing the molecular lesion.
  - reference: PMID:29229923
    reference_title: "Eml1 loss impairs apical progenitor spindle length and soma shape in the developing cerebral cortex."
    supports: SUPPORT
    evidence_source: IN_VITRO
    snippet: >-
      MT dynamics are perturbed in mutant progenitor cells in vitro
    explanation: >-
      Demonstrates that Eml1 loss perturbs microtubule dynamics in progenitor
      cells, the proximal cytoskeletal defect.
  downstream:
  - target: Centrosome, Cilium and Mitotic Spindle Perturbation in Apical Radial Glia
- name: Centrosome, Cilium and Mitotic Spindle Perturbation in Apical Radial Glia
  conforms_to: "neural_progenitor_centrosome_spindle_dysfunction#Centrosome and Mitotic Spindle Perturbation"
  description: >-
    Microtubule dysregulation in EML1-deficient apical radial glia disrupts the
    centrosome and primary cilium and abnormally elongates the mitotic spindle.
    Cilia are shorter, less numerous and aberrantly oriented within vesicles,
    and centrosomes and microtubule regrowth are impaired in both mouse mutant
    radial glia and human patient cells, placing the proximal lesion at the
    progenitor centrosome/spindle apparatus.
  cell_types:
  - preferred_term: apical radial glial cell
    term:
      id: CL:0000681
      label: radial glial cell
  biological_processes:
  - preferred_term: mitotic spindle organization
    term:
      id: GO:0007052
      label: mitotic spindle organization
    modifier: DYSREGULATED
  - preferred_term: centrosome cycle
    term:
      id: GO:0007098
      label: centrosome cycle
    modifier: DYSREGULATED
  - preferred_term: cilium assembly
    term:
      id: GO:0060271
      label: cilium assembly
    modifier: DECREASED
  evidence:
  - reference: PMID:29229923
    reference_title: "Eml1 loss impairs apical progenitor spindle length and soma shape in the developing cerebral cortex."
    supports: SUPPORT
    evidence_source: MODEL_ORGANISM
    snippet: >-
      centrosome and primary cilia were altered and spindles were found to be
      abnormally long in HeCo progenitors
    explanation: >-
      Documents altered centrosome and primary cilia with abnormally elongated
      mitotic spindles in EML1-deficient progenitors.
  - reference: PMID:31390572
    reference_title: "Mutations in the Heterotopia Gene Eml1/EML1 Severely Disrupt the Formation of Primary Cilia."
    supports: SUPPORT
    evidence_source: MODEL_ORGANISM
    snippet: >-
      In HeCo aRGs, cilia are shorter, less numerous, and often found aberrantly
      oriented within vesicles
    explanation: >-
      Documents the primary-cilium defect in EML1-deficient apical radial glia.
  - reference: PMID:39316454
    reference_title: "Forebrain Eml1 depletion reveals early centrosomal dysfunction causing subcortical heterotopia."
    supports: SUPPORT
    evidence_source: MODEL_ORGANISM
    snippet: >-
      In a forebrain conditional Eml1 mutant model
    explanation: >-
      Identifies the mouse conditional Eml1 model used to show early
      centrosomal dysfunction.
  - reference: PMID:39316454
    reference_title: "Forebrain Eml1 depletion reveals early centrosomal dysfunction causing subcortical heterotopia."
    supports: SUPPORT
    evidence_source: IN_VITRO
    snippet: >-
      human patient cells, primary cilia and centrosomes are altered.
    explanation: >-
      Separately captures the patient-cell component of the same study as
      in-vitro evidence for centrosome and primary-cilium alteration.
  downstream:
  - target: Apical Radial Glia Delamination and Ectopic Progenitors
- name: Apical Radial Glia Delamination and Ectopic Progenitors
  conforms_to: "neural_progenitor_centrosome_spindle_dysfunction#Abnormal Progenitor Division and Fate Choice"
  description: >-
    Centrosome/spindle perturbation causes apical radial glia to lose their
    apical anchoring and delaminate from the ventricular zone, so that dividing
    progenitors become abnormally distributed throughout the cortical wall rather
    than confined to the ventricular and subventricular zones. Misplaced apical
    progenitors are the critical initiating event for heterotopia formation, and
    rescuing microtubule formation in vivo reduces both delamination and
    heterotopia volume, establishing the causal link.
  cell_types:
  - preferred_term: apical radial glial cell
    term:
      id: CL:0000681
      label: radial glial cell
  - preferred_term: neural progenitor cell
    term:
      id: CL:0011020
      label: neural progenitor cell
  biological_processes:
  - preferred_term: establishment of mitotic spindle orientation
    term:
      id: GO:0000132
      label: establishment of mitotic spindle orientation
    modifier: DYSREGULATED
  evidence:
  - reference: PMID:24859200
    reference_title: "Mutations in Eml1 lead to ectopic progenitors and neuronal heterotopia in mouse and human."
    supports: SUPPORT
    evidence_source: MODEL_ORGANISM
    snippet: >-
      While HeCo neurons migrated at the same speed as wild type, abnormally
      distributed dividing progenitors were found throughout the cortical wall
      from embryonic day 13
    explanation: >-
      Shows that the primary defect is abnormally distributed dividing
      progenitors, not slowed neuronal migration.
  - reference: PMID:31390572
    reference_title: "Mutations in the Heterotopia Gene Eml1/EML1 Severely Disrupt the Formation of Primary Cilia."
    supports: SUPPORT
    evidence_source: MODEL_ORGANISM
    snippet: >-
      In HeCo mice, some aRGs are abnormally positioned away from the
      ventricular zone (VZ)
    explanation: >-
      Documents delamination of apical radial glia away from the ventricular
      zone in the EML1-deficient cortex.
  - reference: PMID:39316454
    reference_title: "Forebrain Eml1 depletion reveals early centrosomal dysfunction causing subcortical heterotopia."
    supports: SUPPORT
    evidence_source: MODEL_ORGANISM
    snippet: >-
      By rescuing microtubule formation in Eml1 mutant embryonic brains,
      abnormal radial glia delamination and heterotopia volume were
      significantly reduced
    explanation: >-
      Causal rescue experiment linking microtubule-dependent radial glia
      delamination to heterotopia formation.
  - reference: PMID:35289477
    reference_title: "Human cerebral organoids reveal progenitor pathology in EML1-linked cortical malformation."
    supports: SUPPORT
    evidence_source: IN_VITRO
    snippet: >-
      EML1-deficient organoids display ectopic neural rosettes at the basal side
      of the ventricular zone areas and clusters of heterotopic neurons.
    explanation: >-
      Patient-derived and genome-edited cerebral organoids reproduce a human
      progenitor-displacement phenotype, supporting the apical-radial-glia /
      ectopic-progenitor branch in a human non-animal model.
  downstream:
  - target: Ectopic Neurogenesis and Cortical Neuron Misplacement
- name: Ectopic Neurogenesis and Cortical Neuron Misplacement
  conforms_to: "neural_progenitor_centrosome_spindle_dysfunction#Progenitor Pool Distortion"
  description: >-
    Ectopic progenitors retained within the cortical wall continue to divide and
    generate neurons outside their normal niche. These neurons are produced and
    trapped ectopically, accounting for the excessive number of cortical neurons
    found in the subcortical white matter rather than in the cortical plate.
  cell_types:
  - preferred_term: neural progenitor cell
    term:
      id: CL:0011020
      label: neural progenitor cell
  - preferred_term: cortical neuron
    term:
      id: CL:0000540
      label: neuron
  biological_processes:
  - preferred_term: neuroblast proliferation
    term:
      id: GO:0007405
      label: neuroblast proliferation
    modifier: DYSREGULATED
  evidence:
  - reference: PMID:39316454
    reference_title: "Forebrain Eml1 depletion reveals early centrosomal dysfunction causing subcortical heterotopia."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: >-
      Subcortical heterotopia is a cortical malformation associated with
      epilepsy, intellectual disability, and an excessive number of cortical
      neurons in the white matter
    explanation: >-
      This background statement from a mechanistic model paper defines the
      heterotopia as an excess of cortical neurons retained in the white matter,
      the output of ectopic neurogenesis.
  downstream:
  - target: Ribbon-like Subcortical Heterotopia and Brain Overgrowth
- name: Ribbon-like Subcortical Heterotopia and Brain Overgrowth
  conforms_to: "neural_progenitor_centrosome_spindle_dysfunction#Abnormal Cortical Neuron Output and Gyration"
  description: >-
    The distorted progenitor output produces the characteristic malformation:
    bilateral megalencephaly with a giant ribbon-like subcortical heterotopia,
    partial or complete callosal agenesis and an overlying polymicrogyria-like
    cortex. EML1 mutations underlie ribbon-like heterotopia in humans, and the
    spindle, ectopic-progenitor and heterotopia phenotypes are linked across
    mouse and human.
  cell_types:
  - preferred_term: cortical neuron
    term:
      id: CL:0000540
      label: neuron
  biological_processes:
  - preferred_term: neuron migration
    term:
      id: GO:0001764
      label: neuron migration
    modifier: ABNORMAL
  evidence:
  - reference: PMID:31710781
    reference_title: "EML1-associated brain overgrowth syndrome with ribbon-like heterotopia."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      On brain imaging there is megalencephaly with a characteristic ribbon-like
      subcortical heterotopia combined with partial or complete callosal agenesis
      and an overlying polymicrogyria-like cortical malformation
    explanation: >-
      Documents the defining imaging signature of the EML1 disorder in the human
      cohort.
  - reference: PMID:24859200
    reference_title: "Mutations in Eml1 lead to ectopic progenitors and neuronal heterotopia in mouse and human."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      We further found EML1 to be mutated in ribbon-like heterotopia in humans
    explanation: >-
      Establishes EML1 mutations as the cause of human ribbon-like heterotopia.
  downstream:
  - target: Hypotonia
    description: >-
      The severe malformation syndrome can include hypotonia on physical
      examination.
    causal_link_type: INDIRECT_UNKNOWN_INTERMEDIATES
    evidence:
    - reference: PMID:31710781
      reference_title: "EML1-associated brain overgrowth syndrome with ribbon-like heterotopia."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: >-
        Physical examination revealed macrocephaly, deformational plagiocephaly,
        and hypotonia.
      explanation: >-
        The human cohort reports hypotonia in an affected individual with
        biallelic EML1 disease.
  - target: Spastic tetraplegia
    description: >-
      The neurodevelopmental malformation syndrome can progress to severe
      spastic motor impairment.
    causal_link_type: INDIRECT_UNKNOWN_INTERMEDIATES
    evidence:
    - reference: PMID:31710781
      reference_title: "EML1-associated brain overgrowth syndrome with ribbon-like heterotopia."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: >-
        wheelchair dependent with spastic tetraplegia
      explanation: >-
        The human cohort documents spastic tetraplegia in an affected
        individual.
  - target: Feeding difficulties
    description: >-
      Severe neurologic impairment in the malformation syndrome can be
      accompanied by feeding difficulty.
    causal_link_type: INDIRECT_UNKNOWN_INTERMEDIATES
    evidence:
    - reference: PMID:31710781
      reference_title: "EML1-associated brain overgrowth syndrome with ribbon-like heterotopia."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: >-
        He frequently aspirated on liquids and was unable to eat solid foods.
      explanation: >-
        The cohort describes aspiration with liquids and inability to eat solid
        foods, supporting feeding difficulty.
  - target: Strabismus
    description: >-
      Ophthalmologic involvement can include strabismus.
    causal_link_type: INDIRECT_UNKNOWN_INTERMEDIATES
    evidence:
    - reference: PMID:31710781
      reference_title: "EML1-associated brain overgrowth syndrome with ribbon-like heterotopia."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: >-
        Ophthalmological assessment showed strabismus and optic atrophy.
      explanation: >-
        The human cohort directly reports strabismus in an affected individual.
  - target: Optic atrophy
    description: >-
      Ophthalmologic involvement can include optic atrophy.
    causal_link_type: INDIRECT_UNKNOWN_INTERMEDIATES
    evidence:
    - reference: PMID:31710781
      reference_title: "EML1-associated brain overgrowth syndrome with ribbon-like heterotopia."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: >-
        Ophthalmological assessment showed strabismus and optic atrophy.
      explanation: >-
        The human cohort directly reports optic atrophy in an affected
        individual.
phenotypes:
- name: Ribbon-like Subcortical Heterotopia
  description: >-
    The defining neuroradiological feature: bilateral giant ribbon-like
    subcortical (gray matter) heterotopia, distinct from the band heterotopia of
    DCX/PAFAH1B1.
  phenotype_term:
    preferred_term: Giant ribbon-like subcortical heterotopia
    term:
      id: HP:0002282
      label: Gray matter heterotopia
  evidence:
  - reference: PMID:31710781
    reference_title: "EML1-associated brain overgrowth syndrome with ribbon-like heterotopia."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      On brain imaging there is megalencephaly with a characteristic ribbon-like
      subcortical heterotopia combined with partial or complete callosal agenesis
      and an overlying polymicrogyria-like cortical malformation
    explanation: >-
      Documents the characteristic ribbon-like subcortical heterotopia in the
      EML1 human cohort.
- name: Megalencephaly
  description: >-
    Brain overgrowth (megalencephaly) is a consistent feature, giving the
    disorder its description as an EML1-associated brain overgrowth syndrome.
  phenotype_term:
    preferred_term: Megalencephaly
    term:
      id: HP:0001355
      label: Megalencephaly
  evidence:
  - reference: PMID:31710781
    reference_title: "EML1-associated brain overgrowth syndrome with ribbon-like heterotopia."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      On brain imaging there is megalencephaly with a characteristic ribbon-like
      subcortical heterotopia
    explanation: >-
      Documents megalencephaly as a consistent imaging feature in the EML1
      cohort.
- name: Macrocephaly
  description: >-
    Macrocephaly is a measurable clinical sign of the brain-overgrowth phenotype
    and remains enlarged even after shunting in reported patients.
  phenotype_term:
    preferred_term: Macrocephaly
    term:
      id: HP:0000256
      label: Macrocephaly
  evidence:
  - reference: PMID:31710781
    reference_title: "EML1-associated brain overgrowth syndrome with ribbon-like heterotopia."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      All individuals were macrocephalic (>2.5 SD)
    explanation: >-
      Captures macrocephaly as a clinical sign distinct from the imaging term
      megalencephaly.
- name: Agenesis of Corpus Callosum
  description: >-
    Partial or complete agenesis of the corpus callosum accompanies the cortical
    malformation in most reported individuals.
  phenotype_term:
    preferred_term: Partial or complete callosal agenesis
    term:
      id: HP:0001274
      label: Agenesis of corpus callosum
  evidence:
  - reference: PMID:31710781
    reference_title: "EML1-associated brain overgrowth syndrome with ribbon-like heterotopia."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      combined with partial or complete callosal agenesis and an overlying
      polymicrogyria-like cortical malformation
    explanation: >-
      Documents partial or complete callosal agenesis in the EML1 cohort.
- name: Polymicrogyria-like Cortical Malformation
  description: >-
    An overlying polymicrogyria-like cortical malformation is seen above the
    heterotopia.
  phenotype_term:
    preferred_term: Polymicrogyria-like cortical malformation
    term:
      id: HP:0002126
      label: Polymicrogyria
  evidence:
  - reference: PMID:31710781
    reference_title: "EML1-associated brain overgrowth syndrome with ribbon-like heterotopia."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      an overlying polymicrogyria-like cortical malformation
    explanation: >-
      Documents the overlying polymicrogyria-like cortex in the EML1 cohort.
- name: Severe Developmental Delay
  description: >-
    Affected individuals show severe developmental delay as a core clinical
    feature.
  phenotype_term:
    preferred_term: Severe global developmental delay
    term:
      id: HP:0011344
      label: Severe global developmental delay
  evidence:
  - reference: PMID:31710781
    reference_title: "EML1-associated brain overgrowth syndrome with ribbon-like heterotopia."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      The clinical syndrome is characterized by mainly neurological features
      including severe developmental delay, drug-resistant seizures and visual
      impairment
    explanation: >-
      Documents severe developmental delay as a core clinical feature of the
      EML1 syndrome.
- name: Drug-resistant Seizures
  description: >-
    Drug-resistant epilepsy is a characteristic and near-universal clinical
    feature.
  phenotype_term:
    preferred_term: Drug-resistant seizures
    term:
      id: HP:0001250
      label: Seizure
  frequency: VERY_FREQUENT
  evidence:
  - reference: PMID:31710781
    reference_title: "EML1-associated brain overgrowth syndrome with ribbon-like heterotopia."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      The clinical syndrome is characterized by mainly neurological features
      including severe developmental delay, drug-resistant seizures and visual
      impairment
    explanation: >-
      Documents drug-resistant seizures as a characteristic feature of the EML1
      syndrome.
- name: Visual Impairment
  description: >-
    Visual impairment is part of the consistent neurological phenotype.
  phenotype_term:
    preferred_term: Visual impairment
    term:
      id: HP:0000505
      label: Visual impairment
  evidence:
  - reference: PMID:31710781
    reference_title: "EML1-associated brain overgrowth syndrome with ribbon-like heterotopia."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      biallelic EML1 disease-causing variants cause a highly specific pattern of
      congenital brain malformations, severe developmental delay, seizures and
      visual impairment
    explanation: >-
      Documents visual impairment as part of the consistent EML1 clinical
      phenotype.
- name: Hydrocephalus
  description: >-
    Hydrocephalus is present in approximately half of reported cases and can be
    recognized on prenatal imaging.
  phenotype_term:
    preferred_term: Hydrocephalus
    term:
      id: HP:0000238
      label: Hydrocephalus
  frequency: FREQUENT
  evidence:
  - reference: PMID:31710781
    reference_title: "EML1-associated brain overgrowth syndrome with ribbon-like heterotopia."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      hydrocephalus (in half of the cases)
    explanation: >-
      Documents hydrocephalus in approximately half of the EML1 cohort,
      supporting a FREQUENT band.
- name: Hypotonia
  description: >-
    Hypotonia has been reported on physical examination in the EML1-associated
    malformation syndrome.
  phenotype_term:
    preferred_term: Hypotonia
    term:
      id: HP:0001252
      label: Hypotonia
  evidence:
  - reference: PMID:31710781
    reference_title: "EML1-associated brain overgrowth syndrome with ribbon-like heterotopia."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Physical examination revealed macrocephaly, deformational plagiocephaly,
      and hypotonia.
    explanation: >-
      Documents hypotonia in an affected individual with biallelic EML1
      disease.
- name: Spastic tetraplegia
  description: >-
    Severe motor impairment can include spastic tetraplegia.
  phenotype_term:
    preferred_term: Spastic tetraplegia
    term:
      id: HP:0002510
      label: Spastic tetraplegia
  evidence:
  - reference: PMID:31710781
    reference_title: "EML1-associated brain overgrowth syndrome with ribbon-like heterotopia."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      wheelchair dependent with spastic tetraplegia
    explanation: >-
      Documents spastic tetraplegia in an affected individual.
- name: Feeding difficulties
  description: >-
    Feeding difficulty can occur with severe neurologic impairment.
  phenotype_term:
    preferred_term: Feeding difficulties
    term:
      id: HP:0011968
      label: Feeding difficulties
  evidence:
  - reference: PMID:31710781
    reference_title: "EML1-associated brain overgrowth syndrome with ribbon-like heterotopia."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      He frequently aspirated on liquids and was unable to eat solid foods.
    explanation: >-
      Documents aspiration on liquids and inability to eat solid foods in an
      affected individual.
- name: Strabismus
  description: >-
    Strabismus is a reported ophthalmologic finding.
  phenotype_term:
    preferred_term: Strabismus
    term:
      id: HP:0000486
      label: Strabismus
  evidence:
  - reference: PMID:31710781
    reference_title: "EML1-associated brain overgrowth syndrome with ribbon-like heterotopia."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Ophthalmological assessment showed strabismus and optic atrophy.
    explanation: >-
      Documents strabismus in an affected individual.
- name: Optic atrophy
  description: >-
    Optic atrophy is a reported ophthalmologic finding.
  phenotype_term:
    preferred_term: Optic atrophy
    term:
      id: HP:0000648
      label: Optic atrophy
  evidence:
  - reference: PMID:31710781
    reference_title: "EML1-associated brain overgrowth syndrome with ribbon-like heterotopia."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Ophthalmological assessment showed strabismus and optic atrophy.
    explanation: >-
      Documents optic atrophy in an affected individual.
genetic:
- name: EML1
  association: Loss of function
  gene_term:
    preferred_term: EML1 (EMAP-1)
    term:
      id: hgnc:3330
      label: EML1
  evidence:
  - reference: PMID:24859200
    reference_title: "Mutations in Eml1 lead to ectopic progenitors and neuronal heterotopia in mouse and human."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      We further found EML1 to be mutated in ribbon-like heterotopia in humans
    explanation: >-
      Founding identification of EML1 mutations as the cause of human ribbon-like
      heterotopia.
  - reference: PMID:31710781
    reference_title: "EML1-associated brain overgrowth syndrome with ribbon-like heterotopia."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      From review of the clinical and imaging data of eight individuals from five
      families with biallelic EML1 variants, a very consistent imaging phenotype
      emerges
    explanation: >-
      Confirms biallelic (recessive) EML1 variants across multiple families with
      a consistent phenotype.
treatments:
- name: Anti-Seizure Medication
  description: >-
    Symptomatic management of the drug-resistant epilepsy associated with the
    EML1 syndrome using standard anti-seizure medications selected by seizure
    type. No disease-modifying therapy exists; management is supportive.
  treatment_term:
    preferred_term: pharmacotherapy
    term:
      id: NCIT:C15986
      label: Pharmacotherapy
    therapeutic_agent:
    - preferred_term: levetiracetam
      term:
        id: CHEBI:6437
        label: levetiracetam
- name: Supportive and Rehabilitative Care
  description: >-
    Multidisciplinary supportive care including physical, occupational and
    developmental therapies for the severe developmental delay, motor impairment
    and visual impairment, plus neurosurgical management of hydrocephalus where
    present.
  treatment_term:
    preferred_term: supportive care
    term:
      id: MAXO:0000950
      label: supportive care
discussions:
- discussion_id: gap_eml1_mouse_organoid_translatability
  prompt: >-
    Which EML1 progenitor defects are conserved between mouse cortical
    heterotopia models and human iPSC-derived cerebral organoids, and which
    disease branches depend on human-specific basal radial glia, extracellular
    matrix, or OSVZ-like biology?
  kind: HUMAN_MODEL_MISMATCH
  status: OPEN
  attaches_to:
  - pathophysiology#Centrosome, Cilium and Mitotic Spindle Perturbation in Apical Radial Glia
  - pathophysiology#Apical Radial Glia Delamination and Ectopic Progenitors
  - pathophysiology#Ectopic Neurogenesis and Cortical Neuron Misplacement
  - pathophysiology#Ribbon-like Subcortical Heterotopia and Brain Overgrowth
  rationale: >-
    Mouse HeCo, knockout and conditional Eml1 models establish the conserved
    centrosome/cilium/spindle lesion and in vivo microtubule-rescue effect, but
    human cerebral organoids add disease-specific evidence for ectopic neural
    rosettes, heterotopic neuron clusters, basal radial glial marker expansion
    and human-specific extracellular matrix signatures. The open question is
    whether these organoid phenotypes are direct consequences of the same
    EML1-centrosome lesion or a human-amplified OSVZ/oRG branch that is only
    partly represented in lissencephalic rodent cortex.
  evidence:
  - reference: PMID:35289477
    reference_title: "Human cerebral organoids reveal progenitor pathology in EML1-linked cortical malformation."
    supports: SUPPORT
    evidence_source: IN_VITRO
    snippet: >-
      The lack of human-specific models hampers our understanding of the
      molecular underpinnings of the intricate processes leading to MCD.
    explanation: >-
      Supports treating mouse-to-human translatability as an explicit knowledge
      gap for EML1-linked malformations of cortical development.
  - reference: PMID:35289477
    reference_title: "Human cerebral organoids reveal progenitor pathology in EML1-linked cortical malformation."
    supports: SUPPORT
    evidence_source: IN_VITRO
    snippet: >-
      Single-cell RNA sequencing shows an upregulation of basal radial glial
      (RG) markers and human-specific extracellular matrix components in the
      ectopic cell population.
    explanation: >-
      Supports a human organoid branch involving basal radial glial and
      human-specific extracellular matrix programs that is not fully resolved by
      mouse models alone.
  proposed_experiments:
  - experiment_id: exp_eml1_isogenic_organoid_microtubule_yap1_rescue
    name: EML1 isogenic organoid microtubule and YAP1 rescue panel
    description: >-
      Compare patient-derived EML1 organoids, CRISPR-corrected isogenic
      organoids and knock-in mutant controls, with orthogonal rescue arms that
      restore microtubule formation or dampen YAP1-triggered expansion. Quantify
      centrosome/cilium integrity, spindle orientation, radial-glial
      delamination, ectopic rosette formation, basal radial glial markers,
      extracellular matrix programs and heterotopic neuron clusters.
    experiment_type:
      preferred_term: isogenic cerebral organoid rescue assay
    model_systems:
    - name: Human iPSC-derived cerebral organoid EML1 model
      description: >-
        Patient-derived or genome-edited human cerebral organoids carrying EML1
        loss-of-function or patient missense variants, with matched isogenic
        corrected controls.
      experimental_model_type: ORGANOID
      namo_type: namo:Organoid
      organism:
        preferred_term: human
        term:
          id: NCBITaxon:9606
          label: Homo sapiens
      tissue_term:
        preferred_term: cerebral cortex
        term:
          id: UBERON:0000956
          label: cerebral cortex
      cell_types:
      - preferred_term: radial glial cell
        term:
          id: CL:0000681
          label: radial glial cell
      - preferred_term: neural progenitor cell
        term:
          id: CL:0011020
          label: neural progenitor cell
      cell_source: Patient-derived or isogenic engineered human induced pluripotent stem cells
      culture_system: Three-dimensional cerebral organoid with imaging and single-cell readouts
    perturbations:
    - name: EML1 variant correction or knock-in
      target: pathophysiology#EML1 Loss of Function and Microtubule Dysregulation
      description: >-
        Correct patient EML1 variants or introduce matched variants into control
        iPSCs to separate causal EML1 effects from donor background.
    - name: Microtubule formation rescue
      target: pathophysiology#Apical Radial Glia Delamination and Ectopic Progenitors
      description: >-
        Test whether the mouse in vivo microtubule-rescue effect also rescues
        human organoid radial-glial delamination and ectopic rosette formation.
    - name: YAP1 pathway dampening
      target: pathophysiology#Ectopic Neurogenesis and Cortical Neuron Misplacement
      description: >-
        Perturb the organoid YAP1 expansion branch to test whether it is
        necessary for ectopic progenitor expansion and heterotopic neuron
        clusters downstream of EML1 loss.
    readouts:
    - name: Progenitor architecture and heterotopic neuron output
      target: pathophysiology#Ribbon-like Subcortical Heterotopia and Brain Overgrowth
      description: >-
        Quantify ectopic neural rosettes, basal radial glial markers,
        extracellular matrix programs and heterotopic neuron clusters across
        mutant, corrected and rescue conditions.
      assays:
      - preferred_term: immunostaining
      - preferred_term: single-cell transcriptomic profiling
      direction: POSITIVE
    controls:
    - name: Isogenic corrected organoids
      description: Matched organoids in which the EML1 variant is corrected.
    - name: Isogenic knock-in organoids
      description: Wild-type-background organoids carrying introduced EML1 variants.
    decision_criterion: >-
      A conserved EML1-centrosome skeleton is supported if variant correction or
      microtubule rescue normalizes both mouse and organoid progenitor
      delamination readouts. A human-specific branch is supported if organoid
      basal radial glial, extracellular-matrix or YAP1 phenotypes persist as
      separable outputs not captured by the mouse model.
    would_support:
    - pathophysiology#Apical Radial Glia Delamination and Ectopic Progenitors
    - pathophysiology#Ectopic Neurogenesis and Cortical Neuron Misplacement
notes: >-
  Entry created from cortical-malformation epic 4098 (issue 4089), seeded from
  Romero, Bahi-Buisson & Francis 2018 (Sem Cell Dev Biol 76:33-75). Modeled as a
  coherent EML1 neural-progenitor centrosome/spindle/cilium pathomechanism
  (ectopic apical radial glia delamination -> ectopic neurogenesis ->
  ribbon-like subcortical heterotopia) and split from the classical DCX/PAFAH1B1
  subcortical band heterotopia (a microtubule-dependent postmitotic neuronal
  migration defect) and from FLNA periventricular nodular heterotopia. The
  progenitor pathophysiology nodes declare conforms_to the
  neural_progenitor_centrosome_spindle_dysfunction module. Mechanistic nodes are
  supported by the HeCo mouse / conditional Eml1 mutant and patient-cell studies
  (tagged MODEL_ORGANISM / IN_VITRO), while the human clinical phenotype derives
  from the Oegema et al. 2019 cohort of eight individuals from five families
  (HUMAN_CLINICAL). No EML1-specific MONDO term currently exists; the entry is
  anchored to the closest available grouping (MONDO:0020491 subcortical band
  heterotopia) as a cross-reference and is relevant to the missing-MONDO-anchor
  epic 3691. The RPGRIP1L interaction (Uzquiano et al. 2019) and the precise
  ordering of centrosome versus cilium defects (partly addressed by Zaidi et al.
  2024) remain open questions.
📚

References & Deep Research

References

6
PMID:24859200
Mutations in Eml1 lead to ectopic progenitors and neuronal heterotopia in mouse and human.
No top-level findings curated for this source.
PMID:31710781
EML1-associated brain overgrowth syndrome with ribbon-like heterotopia.
No top-level findings curated for this source.
PMID:39316454
Forebrain Eml1 depletion reveals early centrosomal dysfunction causing subcortical heterotopia.
No top-level findings curated for this source.
PMID:29229923
Eml1 loss impairs apical progenitor spindle length and soma shape in the developing cerebral cortex.
No top-level findings curated for this source.
PMID:31390572
Mutations in the Heterotopia Gene Eml1/EML1 Severely Disrupt the Formation of Primary Cilia.
No top-level findings curated for this source.
PMID:35289477
Human cerebral organoids reveal progenitor pathology in EML1-linked cortical malformation.
No top-level findings curated for this source.

Deep Research

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Disease Characteristics Research Template
Edison Scientific Literature 27 citations 2026-06-11T19:47:52.218856

Question: You are an expert researcher providing comprehensive, well-cited information.

Provide detailed information focusing on: 1. Key concepts and definitions with current understanding 2. Recent developments and latest research (prioritize 2023-2024 sources) 3. Current applications and real-world implementations 4. Expert opinions and analysis from authoritative sources 5. Relevant statistics and data from recent studies

Format as a comprehensive research report with proper citations. Include URLs and publication dates where available. Always prioritize recent, authoritative sources and provide specific citations for all major claims.

Disease Characteristics Research Template

Target Disease

  • Disease Name: EML1-related Ribbon-like Subcortical Heterotopia
  • MONDO ID: (if available)
  • Category: Mendelian

Research Objectives

Please provide a comprehensive research report on EML1-related Ribbon-like Subcortical Heterotopia covering all of the disease characteristics listed below. This report will be used to populate a disease knowledge base entry. Be thorough and cite primary literature (PMID preferred) for all claims.

For each section, suggested databases/resources are listed. These are the first places you should search for information on each topic.

1. Disease Information

Search first: OMIM, Orphanet, ICD-10/ICD-11, MeSH, PubMed

  • What is the disease? Provide a concise overview.
  • What are the key identifiers? (OMIM, Orphanet, ICD-10/ICD-11, MeSH, Mondo)
  • What are the common synonyms and alternative names?
  • Is the information derived from individual patients (e.g., EHR) or aggregated disease-level resources?

2. Etiology

  • Disease Causal Factors: What are the primary causes? (genetic, environmental, infectious, mechanistic)
  • Risk Factors:

    Search first: PubMed, Cochrane Library, UpToDate, clinical guidelines, ClinVar, ClinGen, GWAS Catalog, PheGenI, CTD, CDC, WHO, epidemiological databases

  • Genetic risk factors (causal variants, susceptibility loci, modifier genes)
  • Environmental risk factors (toxins, lifestyle, occupational exposures, age, sex, family history)
  • Protective Factors:

    Search first: PubMed, Cochrane Library, clinical trial databases, GWAS Catalog, gnomAD, WHO, CDC, nutrition databases

  • Genetic protective factors (protective variants, modifier alleles)
  • Environmental protective factors (diet, lifestyle, exposures that reduce risk)
  • Gene-Environment Interactions: How do genetic and environmental factors interact to influence disease?

    Search first: CTD, PubMed, PheGenI, GxE databases

3. Phenotypes

Search first: HPO (Human Phenotype Ontology), OMIM, Orphanet, PubMed, clinicaltrials.gov, MedDRA, SNOMED CT, DECIPHER, LOINC

For each phenotype, provide: - Phenotype type: symptoms, clinical signs, physical manifestations, behavioral changes, or laboratory abnormalities

For symptoms/signs: HPO, OMIM, Orphanet, PubMed For behavioral changes: HPO, DSM, RDoC (Research Domain Criteria), PubMed For laboratory abnormalities: LOINC, SNOMED CT, LabTests Online, PubMed - Phenotype characteristics: Search first: OMIM, Orphanet, HPO, PubMed - Age of symptom onset (neonatal, childhood, adult-onset, late-onset) - Symptom severity (mild, moderate, severe, variable) - Symptom progression (stable, progressive, episodic, fluctuating) - Frequency among affected individuals (percentage or qualitative) - Quality of life impact: Effects on daily functioning and well-being (per-phenotype when possible) Search first: EQ-5D database, SF-36, WHO QOL databases, PubMed - Suggest HPO (Human Phenotype Ontology) terms for each phenotype

4. Genetic/Molecular Information

  • Causal Genes: Gene mutations or chromosomal abnormalities responsible for disease (gene symbols, OMIM IDs)

    Search first: OMIM, ClinVar, HGMD, Ensembl, NCBI Gene

  • Pathogenic Variants:
  • Affected genes (gene symbols, HGNC IDs) > Search first: OMIM, NCBI Gene, Ensembl, HGNC, UniProt, GeneCards
  • Variant classification (pathogenic, likely pathogenic, VUS per ACMG/AMP guidelines) > Search first: ClinVar, ClinGen, ACMG/AMP guidelines, VarSome
  • Variant type/class (missense, frameshift, nonsense, splice-site, structural)
  • Allele frequency in population databases > Search first: gnomAD, 1000 Genomes, ExAC, TOPMed, dbSNP
  • Somatic vs germline origin > Search first: COSMIC (somatic), ClinVar, ICGC, TCGA
  • Functional consequences (loss of function, gain of function, dominant negative)
  • Modifier Genes: Genes that modify disease severity or expression
  • Epigenetic Information: DNA methylation, histone modifications, chromatin changes affecting disease

    Search first: ENCODE, Roadmap Epigenomics, MethBase, DiseaseMeth

  • Chromosomal Abnormalities: Large-scale genetic changes (aneuploidy, translocations, inversions)

    Search first: DECIPHER, ClinVar, ECARUCA, UCSC Genome Browser

5. Environmental Information

  • Environmental Factors: Non-genetic contributing factors (toxins, radiation, pollution, occupational exposure)

    Search first: CTD (Comparative Toxicogenomics Database), TOXNET, PubMed, EPA databases

  • Lifestyle Factors: Behavioral factors (smoking, diet, exercise, alcohol consumption)

    Search first: CDC databases, WHO, PubMed, NHANES

  • Infectious Agents: If applicable, pathogens causing or triggering disease (bacteria, viruses, fungi, parasites)

    Search first: NCBI Taxonomy, ViPR, BV-BRC, MicrobeDB, GIDEON

6. Mechanism / Pathophysiology

  • Molecular Pathways: Specific signaling cascades or biochemical pathways involved (Wnt, MAPK, mTOR, PI3K-AKT, etc.)

    Search first: KEGG, Reactome, WikiPathways, PathBank, BioCyc

  • Cellular Processes: Cell-level mechanisms (apoptosis, autophagy, cell cycle dysregulation, inflammation, etc.)

    Search first: Gene Ontology (GO), Reactome, KEGG, PubMed

  • Protein Dysfunction: How protein structure or function is altered (misfolding, aggregation, loss of function, gain of function)

    Search first: UniProt, PDB (Protein Data Bank), InterPro, Pfam, AlphaFold

  • Metabolic Changes: Alterations in metabolic processes (energy metabolism, lipid metabolism, amino acid metabolism)

    Search first: KEGG, BioCyc, HMDB (Human Metabolome Database), BRENDA

  • Immune System Involvement: Role of immune response (autoimmunity, immunodeficiency, chronic inflammation)

    Search first: ImmPort, Immunome Database, IEDB, Gene Ontology

  • Tissue Damage Mechanisms: How tissues/ are injured (oxidative stress, ischemia, fibrosis, necrosis)

    Search first: PubMed, Gene Ontology, Reactome

  • Biochemical Abnormalities: Specific molecular defects (enzyme deficiencies, receptor dysfunction, ion channel defects)

    Search first: BRENDA, UniProt, KEGG, OMIM, PubMed

  • Epigenetic Changes: DNA methylation, histone modifications affecting gene expression in disease

    Search first: ENCODE, Roadmap Epigenomics, MethBase, DiseaseMeth

  • Molecular Profiling (if available):
  • Transcriptomics/gene expression changes > Search first: GEO (Gene Expression Omnibus), ArrayExpress, GTEx, Human Cell Atlas, SRA
  • Proteomics findings > Search first: PRIDE, ProteomeXchange, Human Protein Atlas, STRING, BioGRID
  • Metabolomics signatures > Search first: MetaboLights, Metabolomics Workbench, HMDB, METLIN
  • Lipidomics alterations > Search first: LIPID MAPS, SwissLipids, LipidHome, Metabolomics Workbench
  • Genomic structural features > Search first: UCSC Genome Browser, Ensembl, NCBI, dbVar, DGV
  • Advanced Technologies (if applicable):
  • Single-cell analysis findings (cell-type specific mechanisms, cellular heterogeneity) > Search first: Human Cell Atlas, Single Cell Portal, GEO, CELLxGENE
  • Spatial transcriptomics findings > Search first: GEO, Spatial Research, Vizgen, 10x Genomics data
  • Multi-omics integration results > Search first: TCGA, ICGC, cBioPortal, LinkedOmics, PubMed
  • Functional genomics screens (CRISPR, RNAi) > Search first: DepMap, GenomeRNAi, PubMed, BioGRID ORCS

For each mechanism, describe: - The causal chain from initial trigger to clinical manifestation - Which mechanisms are upstream vs downstream - What cell types and biological processes are involved - Suggest GO terms for biological processes and CL terms for cell types

7. Anatomical Structures Affected

  • Organ Level:
  • Primary organs directly affected
  • Secondary organ involvement (complications, secondary effects)
  • Body systems involved (cardiovascular, nervous, digestive, respiratory, endocrine, etc.)

    Search first: Uberon, FMA (Foundational Model of Anatomy), OMIM, HPO, ICD-11, MeSH, SNOMED CT

  • Tissue and Cell Level:
  • Specific tissue types affected (epithelial, connective, muscle, nervous)
  • Specific cell populations targeted (with Cell Ontology terms)

    Search first: Uberon, Human Protein Atlas, Cell Ontology, Human Cell Atlas, CellMarker, PanglaoDB

  • Subcellular Level:
  • Cellular compartments involved (mitochondria, nucleus, ER, lysosomes) (with GO Cellular Component terms)

    Search first: Gene Ontology (Cellular Component), UniProt, Human Protein Atlas

  • Localization:
  • Specific anatomical sites (with UBERON terms) > Search first: FMA, Uberon, NeuroNames (for brain), SNOMED CT
  • Lateralization (unilateral, bilateral, asymmetric) > Search first: HPO, clinical literature, imaging databases

8. Temporal Development

  • Onset:
  • Typical age of onset (congenital, pediatric, adult, geriatric)
  • Onset pattern (acute, subacute, chronic, insidious)

    Search first: OMIM, Orphanet, HPO, PubMed

  • Progression:
  • Disease stages (early, intermediate, advanced, end-stage) > Search first: Cancer Staging Manual (AJCC), WHO classifications, PubMed
  • Progression rate (rapid, slow, variable)
  • Disease course pattern (episodic, relapsing-remitting, progressive, stable)
  • Disease duration (self-limited, chronic lifelong)

    Search first: Disease registries, longitudinal cohort databases, natural history studies, PubMed, Orphanet, OMIM

  • Patterns:
  • Remission patterns (spontaneous, treatment-induced) > Search first: Clinical trial databases, disease registries, PubMed
  • Critical periods (time windows of vulnerability or opportunity for intervention) > Search first: PubMed, developmental biology databases, clinical guidelines

9. Inheritance and Population

  • Epidemiology:
  • Prevalence (cases per 100,000 at given time)
  • Incidence (new cases per 100,000 per year)

    Search first: Orphanet, CDC, WHO, GBD (Global Burden of Disease), national registries, SEER, disease registries

  • For Genetic Etiology:
  • Inheritance pattern (AD, AR, X-linked, mitochondrial, multifactorial, polygenic) > Search first: OMIM, Orphanet, ClinVar, GTR (Genetic Testing Registry)
  • Penetrance (complete, incomplete, age-dependent) > Search first: ClinVar, OMIM, PubMed, ClinGen
  • Expressivity (variable, consistent) > Search first: OMIM, ClinVar, PubMed
  • Genetic anticipation (increasing severity in successive generations) > Search first: OMIM, PubMed (especially for repeat expansion disorders)
  • Germline mosaicism > Search first: ClinVar, OMIM, genetic counseling literature, PubMed
  • Founder effects (population-specific mutations) > Search first: gnomAD, population genetics databases, PubMed
  • Consanguinity role > Search first: OMIM, population studies, genetic counseling resources
  • Carrier frequency > Search first: gnomAD, carrier screening databases, GeneReviews, GTR
  • Population Demographics:
  • Affected populations (ethnic or demographic groups with higher prevalence) > Search first: gnomAD, 1000 Genomes, PAGE Study, PubMed, population registries
  • Geographic distribution (endemic areas, regional variation) > Search first: WHO, CDC, GBD, Orphanet, geographic epidemiology databases
  • Geographic distribution of specific variants
  • Sex ratio (male:female) > Search first: Disease registries, OMIM, PubMed, epidemiological databases
  • Age distribution of affected individuals > Search first: CDC, disease registries, SEER, Orphanet

10. Diagnostics

  • Clinical Tests:
  • Laboratory tests (blood, urine, tissue chemistry, specific enzyme assays) > Search first: LOINC, LabTests Online, PubMed
  • Biomarkers (proteins, metabolites, genetic markers, circulating biomarkers) > Search first: FDA Biomarker List, BEST (Biomarkers, EndpointS, and other Tools), PubMed
  • Imaging studies (X-ray, CT, MRI, PET, ultrasound) > Search first: RadLex, DICOM, Radiopaedia, imaging databases
  • Functional tests (pulmonary function, cardiac stress tests) > Search first: LOINC, clinical guidelines, PubMed
  • Electrophysiology (EEG, EMG, ECG, nerve conduction studies) > Search first: LOINC, clinical neurophysiology databases, PubMed
  • Biopsy findings (histopathology, immunohistochemistry) > Search first: SNOMED CT, College of American Pathologists resources, PubMed
  • Pathology findings (microscopic examination) > Search first: SNOMED CT, Digital Pathology databases, PubMed
  • Genetic Testing:

    Search first: GTR (Genetic Testing Registry), GeneReviews, ClinGen

  • Overview of recommended genetic testing approach
  • Whole genome sequencing (WGS) utility > Search first: GTR, ClinVar, GEL (Genomics England), gnomAD
  • Whole exome sequencing (WES) utility > Search first: GTR, ClinVar, OMIM, GeneMatcher
  • Gene panels (which panels, which genes) > Search first: GTR, ClinVar, laboratory-specific databases
  • Single gene testing > Search first: GTR, ClinVar, OMIM, GeneReviews
  • Chromosomal microarray (CMA) > Search first: DECIPHER, ClinVar, dbVar, ECARUCA
  • Karyotyping > Search first: Chromosome Abnormality Database, ClinVar, cytogenetics resources
  • FISH > Search first: ClinVar, cytogenetics databases, PubMed
  • Mitochondrial DNA testing > Search first: MITOMAP, MSeqDR, ClinVar, GTR
  • Repeat expansion testing > Search first: GTR, ClinVar, repeat expansion databases, PubMed
  • Omics-Based Diagnostics (if applicable):
  • RNA sequencing / transcriptomics > Search first: GEO, ArrayExpress, GTEx, RNA-seq databases
  • Proteomics > Search first: PRIDE, ProteomeXchange, FDA Biomarker database
  • Metabolomics > Search first: MetaboLights, Metabolomics Workbench, HMDB
  • Epigenomics > Search first: GEO, ENCODE, Roadmap Epigenomics, MethBase
  • Liquid biopsy > Search first: COSMIC, ClinVar, liquid biopsy databases, PubMed
  • Clinical Criteria:
  • Standardized diagnostic criteria (DSM, ICD, society guidelines) > Search first: DSM-5, ICD-11, clinical society guidelines, UpToDate
  • Differential diagnosis (other conditions to rule out, with distinguishing features) > Search first: DynaMed, UpToDate, clinical decision support systems
  • Screening:
  • Screening methods for asymptomatic individuals (newborn screening, carrier screening, cascade screening) > Search first: ACMG recommendations, CDC newborn screening, GTR

11. Outcome/Prognosis

  • Survival and Mortality:
  • Survival rate (5-year, 10-year, overall) > Search first: SEER, cancer registries, disease-specific registries, PubMed
  • Life expectancy (with and without treatment if applicable) > Search first: Orphanet, disease registries, actuarial databases, PubMed
  • Mortality rate > Search first: CDC, WHO, GBD, national mortality databases
  • Disease-specific mortality (deaths directly attributable to disease) > Search first: Disease registries, CDC Wonder, GBD, PubMed
  • Morbidity and Function:
  • Morbidity (disease-related disability and health impacts) > Search first: GBD, WHO, disability databases, PubMed
  • Disability outcomes (long-term functional impairments) > Search first: ICF (International Classification of Functioning), disability registries
  • Quality of life measures (EQ-5D, SF-36, PROMIS, disease-specific tools) > Search first: EQ-5D database, SF-36, PROMIS, PubMed
  • Disease Course:
  • Complications (secondary problems: infections, organ failure, etc.) > Search first: ICD codes, disease registries, clinical databases, PubMed
  • Recovery potential (likelihood and extent of recovery, with vs without treatment) > Search first: Natural history studies, rehabilitation databases, PubMed
  • Prediction:
  • Prognostic factors (age, disease severity, biomarkers, treatment response) > Search first: Prognostic models databases, clinical calculators, PubMed
  • Prognostic biomarkers (molecular markers predicting disease course) > Search first: FDA Biomarker database, PubMed, cancer prognostic databases

12. Treatment

  • Pharmacotherapy:
  • Pharmacological treatments (drug names, drug classes, mechanisms of action) > Search first: DrugBank, RxNorm, ATC classification, DailyMed, FDA databases
  • Pharmacogenomics (how genetic variants affect drug metabolism, efficacy, toxicity) > Search first: PharmGKB, CPIC (Clinical Pharmacogenetics), FDA Table of PGx Biomarkers
  • Advanced Therapeutics:
  • Gene therapy (viral vectors, CRISPR, gene replacement, gene editing) > Search first: ClinicalTrials.gov, FDA gene therapy database, ASGCT resources
  • Cell therapy (stem cell transplant, CAR-T, cellular therapeutics) > Search first: ClinicalTrials.gov, FDA cell therapy database, FACT standards
  • RNA-based therapies (ASOs, siRNA, mRNA therapies) > Search first: ClinicalTrials.gov, FDA approvals, PubMed
  • Targeted therapies (treatments directed at specific molecular targets) > Search first: My Cancer Genome, OncoKB, ClinicalTrials.gov, FDA approvals
  • Immunotherapies (checkpoint inhibitors, monoclonal antibodies) > Search first: Cancer Immunotherapy Database, FDA approvals, ClinicalTrials.gov
  • Surgical and Interventional:
  • Surgical interventions (types of surgery, timing, outcomes) > Search first: CPT codes, surgical registries, clinical guidelines, PubMed
  • Supportive and Rehabilitative:
  • Supportive care (symptom management, pain control, nutrition) > Search first: Clinical guidelines, Cochrane Library, PubMed
  • Rehabilitation (physical therapy, occupational therapy, speech therapy) > Search first: Rehabilitation medicine databases, clinical guidelines, PubMed
  • Experimental:
  • Experimental treatments in clinical trials (with NCT identifiers if available) > Search first: ClinicalTrials.gov, EU Clinical Trials Register, WHO ICTRP
  • Treatment Outcomes:
  • Treatment response rates > Search first: Clinical trial databases, FDA reviews, systematic reviews, PubMed
  • Side effects and adverse events > Search first: FDA Adverse Event Reporting System (FAERS), MedWatch, PubMed
  • Treatment Strategy:
  • Treatment algorithms (clinical pathways, decision trees) > Search first: Clinical practice guidelines, NCCN Guidelines, UpToDate
  • Combination therapies > Search first: ClinicalTrials.gov, treatment guidelines, PubMed
  • Personalized medicine approaches (genotype-guided treatment) > Search first: My Cancer Genome, CIViC, PharmGKB, precision medicine databases

For each treatment, suggest MAXO (Medical Action Ontology) terms where applicable.

13. Prevention

  • Prevention Levels:
  • Primary prevention (preventing disease occurrence: vaccination, risk factor modification) > Search first: CDC, WHO, USPSTF recommendations, Cochrane Library
  • Secondary prevention (early detection and treatment: screening programs, early intervention) > Search first: USPSTF, CDC screening guidelines, WHO
  • Tertiary prevention (preventing complications in those with disease) > Search first: Clinical guidelines, disease management protocols, PubMed
  • Immunization: Vaccine strategies (if applicable)

    Search first: CDC vaccine schedules, WHO immunization, FDA vaccine database

  • Screening and Early Detection:
  • Screening programs (population-based: newborn screening, cancer screening) > Search first: CDC screening programs, USPSTF, cancer screening databases
  • Genetic screening (carrier screening, preimplantation genetic diagnosis, prenatal testing) > Search first: ACMG recommendations, ACOG guidelines, GTR
  • Risk stratification (identifying high-risk individuals for targeted prevention) > Search first: Risk prediction models, clinical calculators, PubMed
  • Behavioral Interventions: Lifestyle modifications to reduce risk

    Search first: CDC, WHO, behavioral intervention databases, Cochrane Library

  • Counseling: Genetic counseling (risk assessment, family planning guidance)

    Search first: NSGC resources, ACMG guidelines, GeneReviews

  • Public Health:
  • Public health interventions (sanitation, vector control, health education) > Search first: CDC, WHO, public health databases, PubMed
  • Environmental interventions (reducing environmental risk factors) > Search first: EPA databases, WHO environmental health, PubMed
  • Prophylaxis: Preventive medications or procedures

    Search first: Clinical guidelines, FDA approvals, PubMed

14. Other Species / Natural Disease

  • Taxonomy: Species affected (with NCBI Taxon identifiers)

    Search first: NCBI Taxonomy

  • Breed: Specific breeds affected (with VBO identifiers if applicable)

    Search first: VBO (Vertebrate Breed Ontology)

  • Gene: Orthologous genes in other species (with NCBI Gene IDs)

    Search first: NCBI Gene

  • Natural Disease:
  • Naturally occurring disease in other species (companion animals, wildlife) > Search first: OMIA (Online Mendelian Inheritance in Animals), VetCompass, PubMed
  • Veterinary relevance and importance in animal health > Search first: OMIA, veterinary databases, PubMed
  • Comparative Biology:
  • Comparative pathology (similarities and differences across species) > Search first: OMIA, comparative pathology databases, PubMed
  • Evolutionary conservation of disease mechanisms > Search first: HomoloGene, OrthoMCL, Alliance of Genome Resources
  • Transmission (if applicable):
  • Zoonotic potential > Search first: CDC zoonotic diseases, WHO zoonoses, GIDEON
  • Cross-species susceptibility > Search first: NCBI Taxonomy, veterinary databases, PubMed

15. Model Organisms

  • Model Types:
  • Model organism type (mammalian, invertebrate, cellular, in vitro) > Search first: Alliance of Genome Resources, model organism databases
  • Specific model systems (mouse, rat, zebrafish, Drosophila, C. elegans, yeast, cell lines, organoids, iPSCs) > Search first: MGI, RGD, ZFIN, FlyBase, WormBase, SGD, ATCC, Cellosaurus
  • Induced models (drug treatment, surgical intervention, environmental manipulation) > Search first: MGI, model organism databases, PubMed
  • Genetic Models:
  • Types available (knockout, knock-in, transgenic, conditional, humanized) > Search first: MGI, IMPC, KOMP, EuMMCR, IMSR
  • Model Characteristics:
  • Phenotype recapitulation (how well model reproduces human disease features) > Search first: Model organism databases, comparative studies, PubMed
  • Model limitations (aspects of human disease not captured) > Search first: Model organism databases, PubMed, review articles
  • Applications:
  • Research applications (what aspects of disease can be studied) > Search first: Model organism databases, PubMed
  • Resources:
  • Model databases > Search first: MGI, RGD, ZFIN, FlyBase, WormBase, IMSR, EMMA, MMRRC

Citation Requirements

  • Cite primary literature (PMID preferred) for all mechanistic and clinical claims
  • Prioritize recent reviews and landmark papers
  • Include direct quotes from abstracts where possible to support key statements
  • Distinguish evidence source types: human clinical, model organism, in vitro, computational

Output Format

Structure your response as a comprehensive narrative organized by the sections above. For each section, provide: - Factual content with specific details (numbers, percentages, gene names, variant nomenclature) - Ontology term suggestions (HPO, GO, CL, UBERON, CHEBI, MAXO, MONDO) where applicable - Evidence citations with PMIDs - Direct quotes from abstracts to support key claims - Clear indication when information is not available or not applicable for this disease

This report will be used to populate a disease knowledge base entry with: - Pathophysiology descriptions with causal chains - Gene/protein annotations (HGNC, GO terms) - Phenotype associations (HP terms) with frequencies - Cell type involvement (CL terms) - Anatomical locations (UBERON terms) - Chemical entities (CHEBI terms) - Treatment annotations (MAXO terms) - Evidence items with PMIDs and exact abstract quotes - Epidemiology, prognosis, diagnostic, and prevention information - Animal model descriptions with phenotype recapitulation details

Comprehensive Research Report: EML1-related Ribbon-like Subcortical Heterotopia (RSH)

Executive summary

EML1-related ribbon-like subcortical heterotopia (RSH; also described as “diffuse ribbon-like heterotopia”) is a rare, autosomal recessive malformation of cortical development characterized by a bilateral, symmetric, continuous ribbon-like band of heterotopic gray matter in the cerebral white matter, typically accompanied by a polymicrogyria-like (thin/dysplastic) cortex and frequent corpus callosum agenesis; megalencephaly and hydrocephalus/ventriculomegaly are common accompanying imaging findings. Clinical manifestations include global developmental delay/intellectual disability and epilepsy that may be drug-resistant. Recent work (2024) provides causal mechanistic evidence that EML1 loss disrupts microtubule dynamics and centrosome/primary cilium integrity in radial glia, driving radial glia delamination and heterotopia formation, with partial rescue by restoring microtubule formation in vivo. (zaidi2024forebraineml1depletion pages 1-2, oegema2019subcorticalheterotopicgray pages 3-5, markus2021anovelmissense pages 1-2, jabali2022humancerebralorganoids pages 1-2)

Topic Key findings Evidence type Publication (authors, journal) Year/month Identifier (DOI; PMID if present else 'PMID not in excerpt') URL
Definition / clinical overview Defines EML1-related subcortical heterotopia as a cortical malformation with excessive cortical neurons in white matter; patients may have hydrocephalus, polymicrogyria, megalencephaly, corpus callosum pathology, severe epilepsy, intellectual disability, and psychomotor delay. Also notes EML1/EML1 is the only known gene reported mutated in both human patients and rodent SH models in this context. (zaidi2024forebraineml1depletion pages 1-2) Human clinical + mechanistic study Zaidi et al., Journal of Cell Biology 2024/Sep DOI: 10.1083/jcb.202310157; PMID not in excerpt https://doi.org/10.1083/jcb.202310157
Definition / inheritance / rarity Reviews ribbon-like subcortical heterotopia (RSH) as a special subcortical heterotopia characterized by huge, tortuous ribbons of gray matter, usually bilateral and associated with corpus callosum agenesis and diffuse polymicrogyria. States EML1 mutations are inherited in an autosomal recessive manner and that only six unrelated affected families had been reported at that time. (markus2021anovelmissense pages 1-2) Human clinical Markus et al., Journal of Human Genetics 2021/Jul DOI: 10.1038/s10038-021-00947-5; PMID not in excerpt https://doi.org/10.1038/s10038-021-00947-5
Imaging / human genetics First major human genetic report linking EML1 mutations to ribbon-like heterotopia. Affected children from two families had giant bilateral periventricular and ribbon-like subcortical heterotopia with polymicrogyria and agenesis of the corpus callosum; the study also linked the disorder to ectopic progenitors and abnormal spindle orientation. (kielar2014mutationsineml1 pages 1-2, kielar2014mutationsineml1 pages 7-8) Human clinical + mouse model Kielar et al., Nature Neuroscience 2014/May DOI: 10.1038/nn.3729; PMID not in excerpt https://doi.org/10.1038/nn.3729
Cohort statistics / subtype classification In a 107-person subcortical heterotopia cohort, 81% had delayed development or intellectual disability, 69% had epilepsy, and 64% had corpus callosum abnormalities. The paper classifies EML1 disease as rare Group 2a “diffuse ribbon-like HET,” described as megalencephaly with a bilateral symmetric continuous undulating ribbon-like gray matter layer; only 2 such cases were in the table and 3 families had been reported. (oegema2019subcorticalheterotopicgray pages 3-5, oegema2019subcorticalheterotopicgray pages 1-2) Human clinical cohort / review-classification Oegema et al., Neurology 2019/Oct DOI: 10.1212/WNL.0000000000008200; PMID not in excerpt https://doi.org/10.1212/WNL.0000000000008200
EML1-specific imaging hallmarks Details the EML1-associated imaging pattern as complete agenesis of the corpus callosum, bilateral undulating ribbon-like heterotopia throughout the white matter, polymicrogyria-like cortex, megalencephaly, and sometimes enlarged ventricles/hydrocephalus requiring shunting. (oegema2019subcorticalheterotopicgray pages 5-7, oegema2019subcorticalheterotopicgray pages 7-9) Human clinical imaging Oegema et al., Neurology 2019/Oct DOI: 10.1212/WNL.0000000000008200; PMID not in excerpt https://doi.org/10.1212/WNL.0000000000008200
Human disease mechanism in organoids Patient-derived and CRISPR-edited cerebral organoids showed ectopic neural rosettes and heterotopic neuron clusters. Single-cell RNA-seq indicated upregulation of basal radial glia markers and human-specific ECM components, supporting a progenitor-origin mechanism involving perturbed apical radial glia behavior and YAP1-triggered expansion. (jabali2022humancerebralorganoids pages 1-2, jabali2022humancerebralorganoids pages 2-4) Organoid/iPSC Jabali et al., EMBO Reports 2022/Mar DOI: 10.15252/embr.202154027; PMID not in excerpt https://doi.org/10.15252/embr.202154027
Mechanism / rescue experiment In forebrain conditional Eml1 mutants and human patient cells, primary cilia and centrosomes were altered, while mutant radial glia had abnormal microtubule dynamics and cell-cycle kinetics. Rescue of microtubule formation in embryonic brains significantly reduced radial glia delamination and heterotopia volume, providing causal evidence from microtubule dysregulation to malformation. (zaidi2024forebraineml1depletion pages 1-2, zaidi2024forebraineml1depletion media 74f3b38a, zaidi2024forebraineml1depletion media 4de352ef) Mouse model + human patient cells Zaidi et al., Journal of Cell Biology 2024/Sep DOI: 10.1083/jcb.202310157; PMID not in excerpt https://doi.org/10.1083/jcb.202310157
Cellular mechanism / cilia Reports a novel homozygous missense variant p.Gly231Asp in EML1 in an affected male and shows significantly reduced primary cilia length in patient-derived fibroblasts. Supports a ciliary component to pathogenesis while confirming the established genotype-phenotype association of EML1 mutations with bilateral RSH. (markus2021anovelmissense pages 1-2, markus2021anovelmissense pages 8-8) Human clinical + patient-cell study Markus et al., Journal of Human Genetics 2021/Jul DOI: 10.1038/s10038-021-00947-5; PMID not in excerpt https://doi.org/10.1038/s10038-021-00947-5
Mouse model neuroanatomy Eml1 knockout mice recapitulate severe cortical heterotopia and show abnormal progenitor cells early in corticogenesis; on a C57BL/6N background they also show a wider phenotype including corpus callosum abnormalities. This supports translational relevance for studying tissue architecture and developmental mechanisms. (collins2019theneuroanatomyof pages 1-2, collins2019theneuroanatomyof pages 2-3) Mouse model Collins et al., Journal of Anatomy 2019/Sep DOI: 10.1111/joa.13013; PMID not in excerpt https://doi.org/10.1111/joa.13013
Mouse mechanism / spindle and microtubules In HeCo mice, Eml1 loss perturbed microtubule plus-end growth, altered centrosomes and primary cilia, lengthened metaphase spindles, and changed progenitor soma shape and cleavage-plane orientation. These ventricular zone abnormalities likely promote progenitor delamination and ectopic progenitor formation. (bizzotto2017eml1lossimpairs pages 1-2, bizzotto2017eml1lossimpairs pages 2-3) Mouse model Bizzotto et al., Scientific Reports 2017/Dec DOI: 10.1038/s41598-017-15253-4; PMID not in excerpt https://doi.org/10.1038/s41598-017-15253-4

Table: This table summarizes the principal human, organoid, and animal-model sources for EML1-related ribbon-like subcortical heterotopia. It highlights what each source contributes on definition, imaging, mechanisms, models, and cohort statistics for rapid evidence review.

1. Disease information

1.1 What is the disease?

Ribbon-like subcortical heterotopia (RSH) is a subtype of subcortical heterotopia in which neurons fail to reach the cortical plate and instead form a huge, tortuous, ribbon-like layer of heterotopic gray matter within subcortical white matter; it is usually bilateral and symmetric. (markus2021anovelmissense pages 1-2)

In the context of biallelic pathogenic variants in EML1 (echinoderm microtubule-associated protein-like 1), this disorder is described neuroradiologically as megalencephaly with a bilateral, symmetric, single continuous undulating ribbon-like heterotopia, typically with a thin/dysplastic (polymicrogyria-like) cortex and associated ventriculomegaly/hydrocephalus and agenesis of the corpus callosum. (oegema2019subcorticalheterotopicgray pages 3-5)

1.2 Key identifiers

  • Causal gene: EML1 (literature notes: OMIM gene entry EML1 #602033). (markus2021anovelmissense pages 1-2)
  • Disease ontology IDs (MONDO/OMIM phenotype/Orphanet/MeSH/ICD-10/ICD-11): Not retrievable from the available tool outputs in this run; classification and synonyms are supported by primary literature and a Neurology classification framework. (oegema2019subcorticalheterotopicgray pages 3-5, markus2021anovelmissense pages 1-2)

1.3 Synonyms / alternative names

  • Ribbon-like subcortical heterotopia (RSH) (markus2021anovelmissense pages 1-2)
  • Diffuse ribbon-like heterotopia / diffuse ribbon-like HET (Group 2a in an imaging-based classification) (oegema2019subcorticalheterotopicgray pages 3-5)
  • Giant-ribbon heterotopia / bilateral giant-ribbon heterotopia (as described in discovery-era literature summaries) (lyman2015corticalcompasseml1 pages 2-2, kielar2014mutationsineml1 pages 7-8)

1.4 Evidence source types

Evidence in this report derives from: * Human genetic case/family studies (EML1 variants with MRI and clinical phenotypes) (kielar2014mutationsineml1 pages 1-2, markus2021anovelmissense pages 1-2) * Aggregated cohort-level classification/statistics for subcortical heterotopia with an EML1-defined subgroup (oegema2019subcorticalheterotopicgray pages 3-5) * Mechanistic animal models (HeCo spontaneous mutant; KO/cKO mice) (bizzotto2017eml1lossimpairs pages 1-2, collins2019theneuroanatomyof pages 1-2) * Human iPSC/organoid models (patient-derived and genome-edited organoids) (jabali2022humancerebralorganoids pages 1-2, jabali2022humancerebralorganoids pages 2-4)

2. Etiology

2.1 Disease causal factors

Primary cause: Biallelic (homozygous or compound heterozygous) pathogenic variants in EML1 causing neurodevelopmental defects in radial glia/progenitors and neuronal migration, leading to subcortical heterotopia. (oegema2019subcorticalheterotopicgray pages 3-5, kielar2014mutationsineml1 pages 1-2, zaidi2024forebraineml1depletion pages 1-2)

Direct abstract-supported quote (human case report): “EML1 mutations are inherited in an autosomal recessive manner. Only six unrelated EML1-associated heterotopia-affected families were reported so far.” (Markus et al., Journal of Human Genetics, published online 1 Jul 2021; https://doi.org/10.1038/s10038-021-00947-5) (markus2021anovelmissense pages 1-2)

2.2 Risk factors

Genetic: Biallelic EML1 variants are causal; consanguinity can increase likelihood of homozygosity and has been reported in some families (e.g., case literature describing homozygous variants from consanguineous parents). (markus2021anovelmissense pages 8-8, kielar2014mutationsineml1 pages 7-8)

Environmental: No specific environmental risk factors were identified in the retrieved evidence; the disorder is treated as a Mendelian malformation of cortical development due to genetic defects. (kielar2014mutationsineml1 pages 1-2, markus2021anovelmissense pages 1-2)

2.3 Protective factors

No genetic or environmental protective factors were identified in the retrieved evidence.

2.4 Gene–environment interactions

No gene–environment interaction evidence was identified in the retrieved sources.

3. Phenotypes (clinical manifestations)

3.1 Core neurodevelopmental phenotypes

Across subcortical heterotopia broadly (107-person cohort), developmental delay/intellectual disability is common: 55/68 (81%) had delayed development or intellectual disability, while 13/68 (19%) had normal development. (oegema2019subcorticalheterotopicgray pages 3-5)

EML1-related RSH is generally described as severe, including severe developmental delay, intellectual disability, and psychomotor developmental delay. (zaidi2024forebraineml1depletion pages 1-2, jabali2022humancerebralorganoids pages 1-2)

Direct abstract-supported quote (mechanistic 2024 paper): “Subcortical heterotopia is a cortical malformation associated with epilepsy, intellectual disability, and an excessive number of cortical neurons in the white matter.” (Zaidi et al., J Cell Biol, Sep 2024; https://doi.org/10.1083/jcb.202310157) (zaidi2024forebraineml1depletion pages 1-2)

Suggested HPO terms (examples; not exhaustive): * Intellectual disability — HP:0001249 * Global developmental delay — HP:0001263 * Psychomotor developmental delay — HP:0001863

3.2 Epilepsy / seizures

In the subcortical heterotopia cohort, epilepsy was documented in 50/72 (69%), with onset skewed to infancy/early childhood (mean 7.3 years; median 4.5 years). (oegema2019subcorticalheterotopicgray pages 2-3, oegema2019subcorticalheterotopicgray pages 3-5)

In EML1-related disease, epilepsy can be severe and drug-resistant in reported patients. (jabali2022humancerebralorganoids pages 1-2)

Suggested HPO terms: * Seizures — HP:0001250 * Epilepsy — HP:0001250 (commonly used parent term) * Drug-resistant epilepsy — HP:0002349

3.3 Structural brain phenotypes (imaging-defined)

EML1 subgroup (“Diffuse ribbon-like heterotopia”, Group 2a): * Megalencephaly with a bilateral and symmetric single continuous undulating ribbon-like heterotopia (oegema2019subcorticalheterotopicgray pages 3-5) * Thin/dysplastic cortex with shallow sulci (polymicrogyria-like) (oegema2019subcorticalheterotopicgray pages 3-5, oegema2019subcorticalheterotopicgray pages 7-9) * Agenesis of the corpus callosum (ACC) (oegema2019subcorticalheterotopicgray pages 3-5, oegema2019subcorticalheterotopicgray pages 7-9) * Prenatal-onset ventriculomegaly or hydrocephalus; some require shunting (oegema2019subcorticalheterotopicgray pages 3-5, oegema2019subcorticalheterotopicgray pages 7-9)

Suggested HPO terms: * Subcortical heterotopia — HP:0010637 (or related heterotopia terms) * Polymicrogyria — HP:0002126 * Agenesis of corpus callosum — HP:0001274 * Megalencephaly — HP:0001355 * Hydrocephalus — HP:0000238

Quality-of-life impact: not quantified in retrieved studies; inferred high burden via severe neurodevelopmental disability and epilepsy. (jabali2022humancerebralorganoids pages 1-2, zaidi2024forebraineml1depletion pages 1-2)

4. Genetic / molecular information

4.1 Causal gene

EML1 encodes a microtubule-associated protein. (markus2021anovelmissense pages 1-2, kielar2014mutationsineml1 pages 1-2)

4.2 Pathogenic variants (examples from retrieved evidence)

Human cases include homozygous and compound heterozygous variants, consistent with biallelic loss-of-function or damaging missense alleles: * c.481C>T (R138X) and c.796A>G (T243A) (compound heterozygous in an affected family) (kielar2014mutationsineml1 pages 7-8, jabali2022humancerebralorganoids pages 1-2) * c.692G>A (p.Gly231Asp) (homozygous missense) (markus2021anovelmissense pages 1-2) * The organoid study references a homozygous W225R case and the compound heterozygous R138X/T243A case. (jabali2022humancerebralorganoids pages 1-2)

Variant types represented include nonsense/truncating and missense variants. (kielar2014mutationsineml1 pages 7-8, markus2021anovelmissense pages 1-2)

Population frequency: the 2014 discovery paper excerpt indicates variants were absent from common population databases, supporting pathogenicity, but no allele frequencies are provided in retrieved excerpts. (kielar2014mutationsineml1 pages 7-8)

4.3 Functional consequence

Evidence supports disruption of microtubule regulation, centrosome/primary cilium biology, and mitotic spindle orientation/behavior in neural progenitors/radial glia. (zaidi2024forebraineml1depletion pages 1-2, bizzotto2017eml1lossimpairs pages 1-2, jabali2022humancerebralorganoids pages 2-4)

4.4 Modifier genes / epigenetics / chromosomal abnormalities

No EML1-specific modifier genes or epigenetic signatures were identified in the retrieved evidence.

5. Environmental information

No non-genetic environmental contributors (toxins, infections, lifestyle) were identified in the retrieved evidence; this condition is treated as a genetic malformation of cortical development. (markus2021anovelmissense pages 1-2, kielar2014mutationsineml1 pages 1-2)

6. Mechanism / pathophysiology (causal chain)

6.1 Current mechanistic understanding

Upstream: Loss of EML1 function in apical radial glia/neural progenitors perturbs the microtubule cytoskeleton and microtubule-organized structures (centrosomes, primary cilia). (zaidi2024forebraineml1depletion pages 1-2, bizzotto2017eml1lossimpairs pages 1-2)

Intermediate cellular events: * Abnormal radial glia positioning and detachment/delamination from the ventricular zone (VZ), with proliferative cells appearing ectopically in basal regions (intermediate zone/cortical plate). (zaidi2024forebraineml1depletion pages 1-2) * Altered mitotic spindle/cleavage-plane orientation and cell-cycle kinetics in progenitors, consistent with progenitor misplacement and altered fate/division patterns. (kielar2014mutationsineml1 pages 7-8, zaidi2024forebraineml1depletion pages 1-2, jabali2022humancerebralorganoids pages 2-4)

Downstream: Ectopic progenitors produce ectopic/heterotopic neurons, forming the ribbon-like heterotopic gray matter band; abnormal cortical architecture (polymicrogyria-like cortex) and associated callosal/hydrocephalus features contribute to clinical epilepsy and neurodevelopmental impairment. (jabali2022humancerebralorganoids pages 1-2, oegema2019subcorticalheterotopicgray pages 3-5)

6.2 Key recent development (2024): causal rescue experiment

Zaidi et al. (Sep 2024) report a causal link between Eml1 microtubule regulation and heterotopia, showing that “By rescuing microtubule formation in Eml1 mutant embryonic brains, abnormal radial glia delamination and heterotopia volume were significantly reduced.” (https://doi.org/10.1083/jcb.202310157) (zaidi2024forebraineml1depletion pages 1-2)

The associated figures retrieved in this run show Pax6+ radial glia detachment patterns and heterotopia volume quantification/3D visualization in the mouse model. (zaidi2024forebraineml1depletion media 74f3b38a, zaidi2024forebraineml1depletion media 4de352ef)

6.3 Human-specific modeling (organoids)

Patient-derived and CRISPR-edited cerebral organoids show ectopic rosettes and heterotopic neuron clusters; single-cell RNA-seq indicates upregulation of basal radial glia markers and ECM components, with analyses suggesting a progenitor origin and YAP1-triggered expansion. (jabali2022humancerebralorganoids pages 1-2)

Suggested GO biological process terms (examples): * Microtubule cytoskeleton organization — GO:0000226 * Cell division — GO:0051301 * Neurogenesis — GO:0022008 * Neuron migration — GO:0001764

Suggested Cell Ontology (CL) terms (examples): * Radial glial cell — CL:0000681 (broadly used) * Neural progenitor cell — CL:0011020 (or related)

7. Anatomical structures affected

Organ/system level

Primary system: central nervous system, specifically cerebral cortex development. (zaidi2024forebraineml1depletion pages 1-2)

Tissue/cell level

  • Developing cortical ventricular zone (VZ) radial glia / apical progenitors are implicated upstream, with ectopic proliferative cells in basal compartments contributing to malformation. (zaidi2024forebraineml1depletion pages 1-2, jabali2022humancerebralorganoids pages 2-4)

Localization (UBERON suggestions)

  • Cerebral cortex — UBERON:0000956
  • Corpus callosum — UBERON:0002070
  • Lateral ventricle — UBERON:0002081

8. Temporal development

Onset

This is a congenital/neurodevelopmental disorder with embryonic onset of pathogenic processes (radial glia detachment reported across embryonic stages in mouse). (zaidi2024forebraineml1depletion pages 1-2, zaidi2024forebraineml1depletion media 74f3b38a)

Progression

The malformation is developmental (formation during corticogenesis), while clinical course includes ongoing epilepsy and persistent neurodevelopmental disability. Detailed longitudinal staging and remission patterns were not provided in retrieved evidence. (jabali2022humancerebralorganoids pages 1-2, oegema2019subcorticalheterotopicgray pages 2-3)

9. Inheritance and population

Inheritance

Evidence supports autosomal recessive, biallelic (homozygous or compound heterozygous) EML1 mutations causing the disorder. (markus2021anovelmissense pages 1-2, kielar2014mutationsineml1 pages 7-8, oegema2019subcorticalheterotopicgray pages 3-5)

Epidemiology

Precise prevalence/incidence is not available in retrieved evidence. Available rarity statements include: * “Only six unrelated EML1-associated heterotopia-affected families were reported so far” (as of Jul 2021). (markus2021anovelmissense pages 1-2) * The EML1 subtype is described as rare with “only 3 families previously published” in the Neurology classification framework. (oegema2019subcorticalheterotopicgray pages 3-5)

10. Diagnostics

10.1 Imaging

Characteristic MRI phenotype for EML1 subgroup is diffuse ribbon-like subcortical heterotopia: bilateral, symmetric, continuous undulating ribbon-like gray matter layer, thin/dysplastic cortex with shallow sulci, ACC, and prenatal ventriculomegaly/hydrocephalus; megalencephaly is part of the syndrome pattern. (oegema2019subcorticalheterotopicgray pages 3-5, oegema2019subcorticalheterotopicgray pages 7-9)

A cohort paper specifies standardized MRI review elements: at least one T1 and one T2 sequence in ≥2 planes. (oegema2019subcorticalheterotopicgray pages 2-3, oegema2019subcorticalheterotopicgray pages 1-2)

10.2 Genetic testing

Case literature demonstrates diagnosis via whole-exome sequencing (WES) with explicit consideration of autosomal recessive models (homozygous and compound heterozygous filtering), followed by variant interpretation/confirmation. (markus2021anovelmissense pages 1-2, markus2021anovelmissense pages 8-8)

10.3 Differential diagnosis

The differential includes other genetic causes of heterotopia and malformations of cortical development (e.g., DCX, PAFAH1B1, TUBA1A), as noted in clinical literature discussing heterotopia genetics and WES filtering. (markus2021anovelmissense pages 1-2)

EEG details and formal diagnostic criteria/guidelines were not retrieved.

11. Outcomes / prognosis

Natural history and prognosis are incompletely characterized due to rarity. Evidence supports: * High burden of neurodevelopmental disability in subcortical heterotopia broadly (81% DD/ID), and frequent epilepsy (69%). (oegema2019subcorticalheterotopicgray pages 3-5) * In EML1-related disease, reports include severe developmental delay/ID and epilepsy that can be drug-resistant/refractory. (jabali2022humancerebralorganoids pages 1-2, kielar2013cellularandmolecular pages 141-144)

No survival or life expectancy data were found in retrieved evidence.

12. Treatment

No EML1-specific disease-modifying therapy is established in retrieved evidence. Management is therefore expected to be supportive and symptom-directed, but specific antiseizure medication regimens, surgical outcomes, and rehabilitation protocols were not provided in the retrieved excerpts.

Evidence relevant to clinical management burden: * Drug-resistant epilepsy is noted in EML1 patients in organoid-linked clinical descriptions. (jabali2022humancerebralorganoids pages 1-2) * Refractory epilepsy is described in a family report excerpt (generalized-onset seizures including atypical absences/atonic falls/tonic seizures). (kielar2013cellularandmolecular pages 141-144)

Potential MAXO terms (suggestions): * Antiseizure therapy — MAXO:0000470 (or closest available in MAXO) * Genetic counseling — MAXO:0000934 (or closest available) * Ventriculoperitoneal shunt placement (for hydrocephalus) — map to appropriate MAXO procedure term (hydrocephalus shunting is referenced as performed in some cases). (oegema2019subcorticalheterotopicgray pages 7-9)

Clinical trials: A clinical trials search did not yield EML1-targeted interventional trials in the retrieved tool output. (clinical_trials_search output; no relevant trials returned)

13. Prevention

Primary prevention is not currently available beyond genetic counseling and reproductive options in families with known pathogenic variants. No screening programs or newborn screening evidence was identified.

14. Other species / natural disease

No naturally occurring EML1-related RSH in non-human species was identified in retrieved evidence. (Note: rodent models exist, but are experimental models rather than naturally occurring veterinary syndromes.)

15. Model organisms and experimental systems

15.1 Mouse models

  • Eml1 knockout mice show severe cortical heterotopia and early corticogenesis progenitor abnormalities; additional anomalies include corpus callosum abnormalities on certain backgrounds. (Collins et al., J Anatomy, Sep 2019; https://doi.org/10.1111/joa.13013) (collins2019theneuroanatomyof pages 1-2)
  • HeCo spontaneous mutant and mechanistic work demonstrate disrupted microtubule dynamics, altered centrosome/cilia features, spindle defects, and progenitor delamination signatures. (bizzotto2017eml1lossimpairs pages 1-2, bizzotto2017eml1lossimpairs pages 2-3)
  • Forebrain conditional Eml1 mutant (Emx1-Cre) provides developmental timing and rescue evidence; figures retrieved show Pax6+ detachment and heterotopia volume reductions under rescue conditions. (zaidi2024forebraineml1depletion pages 1-2, zaidi2024forebraineml1depletion media 74f3b38a, zaidi2024forebraineml1depletion media 4de352ef)

15.2 Human iPSC / organoids

Human cerebral organoids (patient-derived and genome-edited) reproduce ectopic rosettes and heterotopic neuron clusters and identify basal RG expansion programs. (Jabali et al., EMBO Reports, Mar 2022; https://doi.org/10.15252/embr.202154027) (jabali2022humancerebralorganoids pages 1-2, jabali2022humancerebralorganoids pages 2-4)

Limitations of this evidence compilation

  1. PMIDs were not present in the retrieved excerpts/metadata; therefore, DOI-based citations and URLs are provided where available.
  2. MONDO/Orphanet/OMIM phenotype IDs, ICD codes, MeSH were not retrievable with the available tools in this run.
  3. Disease-specific treatment algorithms and EEG details were not available in retrieved evidence; epilepsy drug resistance is mentioned, but medication-level evidence was not found.

Key references (URLs; publication dates where available)

  • Zaidi et al. Journal of Cell Biology (Sep 2024). “Forebrain Eml1 depletion reveals early centrosomal dysfunction causing subcortical heterotopia.” https://doi.org/10.1083/jcb.202310157 (zaidi2024forebraineml1depletion pages 1-2)
  • Jabali et al. EMBO Reports (published online 15 Mar 2022). “Human cerebral organoids reveal progenitor pathology in EML1-linked cortical malformation.” https://doi.org/10.15252/embr.202154027 (jabali2022humancerebralorganoids pages 1-2)
  • Markus et al. Journal of Human Genetics (published online 1 Jul 2021). “A novel missense variant in the EML1 gene associated with bilateral ribbon-like subcortical heterotopia leads to ciliary defects.” https://doi.org/10.1038/s10038-021-00947-5 (markus2021anovelmissense pages 1-2)
  • Oegema et al. Neurology (Oct 2019). “Subcortical heterotopic gray matter brain malformations.” https://doi.org/10.1212/WNL.0000000000008200 (oegema2019subcorticalheterotopicgray pages 3-5)
  • Collins et al. Journal of Anatomy (Sep 2019). “The neuroanatomy of Eml1 knockout mice, a model of subcortical heterotopia.” https://doi.org/10.1111/joa.13013 (collins2019theneuroanatomyof pages 1-2)
  • Kielar et al. Nature Neuroscience (published online 25 May 2014). “Mutations in Eml1 lead to ectopic progenitors and neuronal heterotopia in mouse and human.” https://doi.org/10.1038/nn.3729 (kielar2014mutationsineml1 pages 1-2)

References

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  3. (markus2021anovelmissense pages 1-2): Fenja Markus, Annika Kannengießer, Patricia Näder, Paul Atigbire, Alexander Scholten, Christine Vössing, Eva Bültmann, G. Christoph Korenke, Marta Owczarek-Lipska, and John Neidhardt. A novel missense variant in the eml1 gene associated with bilateral ribbon-like subcortical heterotopia leads to ciliary defects. Journal of Human Genetics, 66:1159-1167, Jul 2021. URL: https://doi.org/10.1038/s10038-021-00947-5, doi:10.1038/s10038-021-00947-5. This article has 9 citations and is from a peer-reviewed journal.

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  6. (kielar2014mutationsineml1 pages 7-8): Michel Kielar, Françoise Phan Dinh Tuy, Sara Bizzotto, Cécile Lebrand, Camino de Juan Romero, Karine Poirier, Renske Oegema, Grazia Maria Mancini, Nadia Bahi-Buisson, Robert Olaso, Anne-Gaëlle Le Moing, Katia Boutourlinsky, Dominique Boucher, Wassila Carpentier, Patrick Berquin, Jean-François Deleuze, Richard Belvindrah, Victor Borrell, Egbert Welker, Jamel Chelly, Alexandre Croquelois, and Fiona Francis. Mutations in eml1 lead to ectopic progenitors and neuronal heterotopia in mouse and human. Nature Neuroscience, 17:923-933, May 2014. URL: https://doi.org/10.1038/nn.3729, doi:10.1038/nn.3729. This article has 148 citations and is from a highest quality peer-reviewed journal.

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  10. (jabali2022humancerebralorganoids pages 2-4): Ammar Jabali, Anne Hoffrichter, Ana Uzquiano, Fabio Marsoner, Ruven Wilkens, Marco Siekmann, Bettina Bohl, Andrea C Rossetti, Sandra Horschitz, Philipp Koch, Fiona Francis, and Julia Ladewig. Human cerebral organoids reveal progenitor pathology in eml1‐linked cortical malformation. EMBO Reports, Mar 2022. URL: https://doi.org/10.15252/embr.202154027, doi:10.15252/embr.202154027. This article has 41 citations and is from a highest quality peer-reviewed journal.

  11. (zaidi2024forebraineml1depletion media 74f3b38a): Donia Zaidi, Kaviya Chinnappa, Berfu Nur Yigit, Valeria Viola, Carmen Cifuentes-Diaz, Ammar Jabali, Ana Uzquiano, Emilie Lemesre, Franck Perez, Julia Ladewig, Julien Ferent, Nurhan Ozlu, and Fiona Francis. Forebrain eml1 depletion reveals early centrosomal dysfunction causing subcortical heterotopia. The Journal of Cell Biology, Sep 2024. URL: https://doi.org/10.1083/jcb.202310157, doi:10.1083/jcb.202310157. This article has 6 citations.

  12. (zaidi2024forebraineml1depletion media 4de352ef): Donia Zaidi, Kaviya Chinnappa, Berfu Nur Yigit, Valeria Viola, Carmen Cifuentes-Diaz, Ammar Jabali, Ana Uzquiano, Emilie Lemesre, Franck Perez, Julia Ladewig, Julien Ferent, Nurhan Ozlu, and Fiona Francis. Forebrain eml1 depletion reveals early centrosomal dysfunction causing subcortical heterotopia. The Journal of Cell Biology, Sep 2024. URL: https://doi.org/10.1083/jcb.202310157, doi:10.1083/jcb.202310157. This article has 6 citations.

  13. (markus2021anovelmissense pages 8-8): Fenja Markus, Annika Kannengießer, Patricia Näder, Paul Atigbire, Alexander Scholten, Christine Vössing, Eva Bültmann, G. Christoph Korenke, Marta Owczarek-Lipska, and John Neidhardt. A novel missense variant in the eml1 gene associated with bilateral ribbon-like subcortical heterotopia leads to ciliary defects. Journal of Human Genetics, 66:1159-1167, Jul 2021. URL: https://doi.org/10.1038/s10038-021-00947-5, doi:10.1038/s10038-021-00947-5. This article has 9 citations and is from a peer-reviewed journal.

  14. (collins2019theneuroanatomyof pages 1-2): Stephan C. Collins, Ana Uzquiano, Mohammed Selloum, Olivia Wendling, Marion Gaborit, Maria Osipenko, Marie‐Christine Birling, Binnaz Yalcin, and Fiona Francis. The neuroanatomy of eml1 knockout mice, a model of subcortical heterotopia. Journal of Anatomy, 235:637-650, Sep 2019. URL: https://doi.org/10.1111/joa.13013, doi:10.1111/joa.13013. This article has 27 citations and is from a domain leading peer-reviewed journal.

  15. (collins2019theneuroanatomyof pages 2-3): Stephan C. Collins, Ana Uzquiano, Mohammed Selloum, Olivia Wendling, Marion Gaborit, Maria Osipenko, Marie‐Christine Birling, Binnaz Yalcin, and Fiona Francis. The neuroanatomy of eml1 knockout mice, a model of subcortical heterotopia. Journal of Anatomy, 235:637-650, Sep 2019. URL: https://doi.org/10.1111/joa.13013, doi:10.1111/joa.13013. This article has 27 citations and is from a domain leading peer-reviewed journal.

  16. (bizzotto2017eml1lossimpairs pages 1-2): Sara Bizzotto, Ana Uzquiano, Florent Dingli, Dmitry Ershov, Anne Houllier, Guillaume Arras, Mark Richards, Damarys Loew, Nicolas Minc, Alexandre Croquelois, Anne Houdusse, and Fiona Francis. Eml1 loss impairs apical progenitor spindle length and soma shape in the developing cerebral cortex. Scientific Reports, Dec 2017. URL: https://doi.org/10.1038/s41598-017-15253-4, doi:10.1038/s41598-017-15253-4. This article has 45 citations and is from a peer-reviewed journal.

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  19. (oegema2019subcorticalheterotopicgray pages 2-3): Renske Oegema, A. James Barkovich, Grazia M.S. Mancini, Renzo Guerrini, and William B. Dobyns. Subcortical heterotopic gray matter brain malformations. Neurology, Oct 2019. URL: https://doi.org/10.1212/wnl.0000000000008200, doi:10.1212/wnl.0000000000008200. This article has 60 citations and is from a highest quality peer-reviewed journal.

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