| 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. (pqac-00000032) | 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. (pqac-00000035, pqac-00000000) | 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. (pqac-00000033, pqac-00000005, pqac-00000024) | 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. (pqac-00000016, pqac-00000017, pqac-00000034) | 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. (pqac-00000007, pqac-00000018, pqac-00000023) | 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. (pqac-00000009, pqac-00000012) | 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. (pqac-00000014, pqac-00000032, pqac-00000036, pqac-00000037) | 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. (pqac-00000000, pqac-00000001, pqac-00000035) | 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. (pqac-00000025, pqac-00000028) | 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. (pqac-00000010, pqac-00000011) | 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.*