Adult Neuronal Ceroid Lipofuscinosis

Mendelian MONDO:0019260 Pathograph 20 Neuronal Ceroid Lipofuscinosis Lysosomal Storage Disease Neurodegenerative Disease

Adult neuronal ceroid lipofuscinosis (adult NCL; Kufs disease) is a rare adult-onset form of the neuronal ceroid lipofuscinosis group of lysosomal storage neurodegenerative diseases. Disease typically begins in the third or fourth decade and is characterized clinically by two main forms: Type A (Kufs-A), a progressive myoclonus epilepsy with dementia, ataxia, and pyramidal or extrapyramidal motor signs; and Type B (Kufs-B), dominated by dementia with motor system dysfunction (cerebellar ataxia or extrapyramidal signs), generally without prominent myoclonic epilepsy. In contrast to the childhood NCL subtypes, retinopathy and visual loss are characteristically absent. Pathologically, neurons accumulate autofluorescent ceroid lipopigment with characteristic ultrastructural granular, curvilinear, and fingerprint inclusions; in CLN6-related Kufs disease, fingerprint profiles predominate. CLN6 participates in an ER-to-Golgi relay for lysosomal enzymes, so CLN6-related adult NCL is modeled as a lysosome-biogenesis/trafficking defect upstream of ceroid storage and neurodegeneration. Adult NCL is genetically heterogeneous and includes autosomal recessive forms caused by pathogenic variants in CLN6 (the most common recessive cause) and CTSF (the major recessive cause of Type B), together with the autosomal dominant CLN4 form caused by pathogenic variants in DNAJC5 encoding cysteine-string protein alpha (CSPalpha). No curative therapy exists and management is supportive, including antiseizure pharmacotherapy in Kufs-A.

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2
Inheritance
5
Pathophys.
1
Histopath.
6
Phenotypes
20
Pathograph
3
Genes
2
Treatments
2
Subtypes
1
References
1
Deep Research
👪

Inheritance

2
Autosomal recessive inheritance HP:0000007
Recessive forms of adult NCL include CLN6-related Kufs Type A and CTSF-related Kufs Type B.
Autosomal recessive inheritance
Show evidence (1 reference)
PMID:21549341 SUPPORT Human Clinical
"We mapped four families with Kufs disease for whom there was good evidence of autosomal-recessive inheritance"
The Arsov et al. linkage study establishes autosomal recessive inheritance in CLN6-related Kufs disease.
Autosomal dominant inheritance HP:0000006
The CLN4 form of adult NCL is caused by autosomal dominant pathogenic variants in DNAJC5.
Autosomal dominant inheritance
Show evidence (1 reference)
PMID:21820099 SUPPORT Human Clinical
"Autosomal-dominant adult-onset neuronal ceroid lipofuscinosis (ANCL) is characterized by accumulation of autofluorescent storage material in neural tissues and neurodegeneration and has an age of onset in the third decade of life or later."
Noskova et al. establish DNAJC5/CLN4 as the autosomal dominant adult form of NCL.
◆

Subtypes

2
Kufs disease Type A
Type A Kufs disease presents in adulthood as a progressive myoclonus epilepsy with debilitating myoclonic seizures, dementia, ataxia, and pyramidal or extrapyramidal motor signs. Type A is usually caused by recessive pathogenic variants in CLN6 or dominant variants in DNAJC5 (CLN4).
Kufs disease Type B
Type B Kufs disease presents with dementia and motor system dysfunction (cerebellar ataxia or extrapyramidal signs), generally without prominent epilepsy. Type B is usually associated with recessive pathogenic variants in CTSF (CLN13).
⚙

Pathophysiology

5
CLN6 EGRESS Complex Lysosomal Enzyme Trafficking Defect
CLN6 is an endoplasmic-reticulum-associated component of the CLN6-CLN8 EGRESS complex that recruits lysosomal enzymes at the ER and promotes their Golgi transfer. CLN6 deficiency impairs ER export of lysosomal enzymes and lowers lysosomal enzyme levels, providing a mechanistic lysosome-biogenesis branch for CLN6-related Kufs disease.
CLN6 link
endoplasmic reticulum to Golgi vesicle-mediated transport link ↕ DYSREGULATED lysosome organization link ↕ DYSREGULATED
endoplasmic reticulum link Golgi apparatus link lysosome link
Downstream
Lipopigment Accumulation in Lysosomes Impaired CLN6/EGRESS-mediated ER export of lysosomal enzymes is expected to diminish lysosomal enzyme delivery and promote the lysosomal storage pathology of CLN6-related Kufs disease.
Show evidence (3 references)
PMID:30561534 SUPPORT Human Clinical
"Mutation of CLN6 has emerged as the most important cause of recessive Kufs disease but, remarkably, is also responsible for variant late infantile ceroid lipofuscinosis."
Human clinical data anchor CLN6 pathogenic variants as a major cause of recessive Kufs disease.
PMID:32597833 SUPPORT In Vitro
"Experiments focused on protein interaction and trafficking identified CLN6 as an obligate component of a CLN6-CLN8 complex (herein referred to as EGRESS: ER-to-Golgi relaying of enzymes of the lysosomal system), which recruits lysosomal enzymes at the ER to promote their Golgi transfer."
Protein-interaction and trafficking experiments support CLN6 as an obligate component of the ER-to-Golgi lysosomal-enzyme relay.
PMID:32597833 SUPPORT Model Organism
"Mice lacking both CLN6 and CLN8 did not display aggravated pathology compared with the single deficiencies, indicating that the EGRESS complex works as a functional unit."
Mouse knockout evidence supports CLN6 and CLN8 functioning in the same EGRESS pathway in vivo.
Lipopigment Accumulation in Lysosomes
Adult NCL neurons accumulate autofluorescent ceroid lipopigment in lysosomal storage bodies. This is the defining pathological hallmark of Kufs disease and the broader NCL group.
neuron link
lysosomal transport link ↕ DYSREGULATED
lysosome link
Downstream
Autofluorescent ceroid lipopigment storage Adult NCL lysosomal storage is directly observable as autofluorescent ceroid/lipopigment storage material in neural tissue.
Progressive Neurodegeneration Lysosomal lipopigment storage contributes to the progressive neurodegeneration that drives the clinical phenotype of adult NCL.
Show evidence (2 references)
PMID:21820099 SUPPORT Human Clinical
"Autosomal-dominant adult-onset neuronal ceroid lipofuscinosis (ANCL) is characterized by accumulation of autofluorescent storage material in neural tissues and neurodegeneration"
Direct evidence that ANCL is defined by autofluorescent lysosomal storage in neural tissues.
PMID:30561534 SUPPORT Human Clinical
"Ultrastructural examination of the pathology revealed fingerprint profiles as the characteristic inclusions, but they were not reliably seen in tissues other than brain."
Human CLN6-related Kufs disease shows characteristic ultrastructural storage inclusions in brain.
DNAJC5/CSPalpha Misfolding and Synaptic Dysfunction
In autosomal dominant CLN4 (Kufs-A), pathogenic variants in DNAJC5 encoding cysteine-string protein alpha (CSPalpha) impair palmitoylation-dependent sorting and reduce the amount of CSPalpha in neuronal cells. Functional depletion of CSPalpha is proposed to drive presynaptic dysfunction and progressive neurodegeneration in parallel with lysosomal accumulation of misfolded, proteolysis-resistant proteins that form characteristic ceroid deposits in neurons.
neuron link
DNAJC5 link
protein folding link ↕ DYSREGULATED protein localization to membrane link ↕ DYSREGULATED
Downstream
Lipopigment Accumulation in Lysosomes DNAJC5/CSPalpha depletion leads to lysosomal accumulation of misfolded proteolysis-resistant proteins as characteristic ceroid deposits in neurons.
Show evidence (1 reference)
PMID:21820099 SUPPORT Human Clinical
"The resulting depletion of functional CSPα might cause in parallel the presynaptic dysfunction and the progressive neurodegeneration observed in affected individuals and lysosomal accumulation of misfolded and proteolysis-resistant proteins in the form of characteristic ceroid deposits in neurons."
Direct mechanistic model from the original DNAJC5 paper linking CSPalpha depletion to synaptic dysfunction, neurodegeneration, and lysosomal ceroid deposition.
Cathepsin F Lysosomal Protease Dysfunction
Recessive missense variants in CTSF impair cathepsin F, a lysosomal cysteine protease, providing a plausible mechanism for the storage-disease phenotype of Type B Kufs disease. In silico modeling predicts altered protein structure and function, and a Ctsf knockout mouse recapitulates the light- and electron-microscopic pathology of Kufs disease.
neuron link
CTSF link
lysosomal proteolysis link ↓ DECREASED
cysteine-type peptidase activity link ↓ DECREASED
Downstream
Lipopigment Accumulation in Lysosomes Cathepsin F loss-of-function is proposed to impair lysosomal proteolysis and drive ceroid lipopigment storage in Type B Kufs disease.
Show evidence (2 references)
PMID:23297359 SUPPORT Human Clinical
"CTSF encodes cathepsin F, a lysosomal cysteine protease, dysfunction of which is a highly plausible candidate mechanism for a storage disorder like ceroid lipofuscinosis."
Directly links CTSF function to lysosomal proteolysis and ceroid lipofuscinosis storage pathology.
PMID:23297359 SUPPORT Model Organism
"re-examination of a previously published mouse knockout of Ctsf shows that it recapitulates the light and electron-microscopic pathological features of Kufs disease."
Mouse-model recapitulation of Kufs pathology supports the CTSF loss-of-function mechanism.
Progressive Neurodegeneration
Adult NCL produces a progressive neurodegenerative phenotype manifesting as dementia, ataxia, and motor system dysfunction, with or without progressive myoclonus epilepsy depending on subtype.
neuron link
Downstream
Dementia Ongoing neurodegeneration produces progressive dementia, an invariable feature of adult NCL.
Myoclonus Neurodegeneration drives myoclonic seizures in Type A Kufs disease.
Cerebellar Ataxia Neurodegeneration produces progressive ataxia, the most prominent motor feature of CLN6-related Kufs disease.
Seizure The progressive myoclonus epilepsy branch of CLN6-related Type A Kufs disease includes tonic-clonic seizures.
Cerebral Atrophy Progressive neuronal loss produces cerebral and cerebellar atrophy on neuroimaging.
EEG photosensitivity The Type A epilepsy phenotype includes high EEG photosensitivity.
Show evidence (1 reference)
PMID:30561534 SUPPORT Human Clinical
"MRI showed progressive cerebral and cerebellar atrophy."
Imaging evidence for progressive cerebral and cerebellar neurodegeneration in CLN6-related Kufs disease.
✶

Histopathology

1
Fingerprint Lipopigment Inclusions
The defining ultrastructural pathology of CLN6-related Kufs disease is autofluorescent lipopigment storage with fingerprint inclusion profiles in neurons. Curvilinear profiles, which are characteristic of variant late infantile NCL, are not a feature of CLN6-related Kufs disease. Detection of storage material can be unreliable in tissues other than brain, contributing to diagnostic difficulty.
Show evidence (2 references)
PMID:30561534 SUPPORT Human Clinical
"Ultrastructural examination of the pathology revealed fingerprint profiles as the characteristic inclusions, but they were not reliably seen in tissues other than brain."
Direct evidence that fingerprint profiles are the characteristic ultrastructural inclusions of CLN6-related Kufs disease.
PMID:30561534 SUPPORT Human Clinical
"Curvilinear profiles, which are seen in the late infantile form, were not a feature."
Distinguishes adult Kufs ultrastructural pathology from the curvilinear inclusions of late-infantile NCL.
⬡

Pathograph

Use the checkboxes to hide or show graph categories. Hover nodes for evidence and cross-linked metadata.
Pathograph: causal mechanism network for Adult Neuronal Ceroid Lipofuscinosis 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

6
Dementia Neurologic HP:0000726
Course: PROGRESSIVE
Show evidence (1 reference)
PMID:30561534 SUPPORT Human Clinical
"Dementia appeared to be an invariable accompaniment, although it could take a number of years to manifest and occasionally cognitive impairment preceded myoclonic seizures."
Berkovic et al. document dementia as an invariable feature of CLN6-related Kufs disease.
Myoclonus Neurologic HP:0001336
Show evidence (1 reference)
PMID:30561534 SUPPORT Human Clinical
"The typical presentation was of progressive myoclonus epilepsy with debilitating myoclonic seizures and relatively infrequent tonic-clonic seizures."
Directly identifies debilitating myoclonic seizures as the typical presentation of Type A Kufs disease.
Seizure Neurologic HP:0001250
Show evidence (1 reference)
PMID:30561534 SUPPORT Human Clinical
"The typical presentation was of progressive myoclonus epilepsy with debilitating myoclonic seizures and relatively infrequent tonic-clonic seizures."
Supports tonic-clonic seizures as a clinical feature of Type A Kufs disease.
Cerebellar Ataxia Neurologic HP:0002073
Show evidence (1 reference)
PMID:30561534 SUPPORT Human Clinical
"Ataxia was the most prominent motor feature."
Supports ataxia as the most prominent motor feature in CLN6-related Kufs disease.
Cerebral Atrophy Neurologic HP:0002120
Course: PROGRESSIVE
Show evidence (1 reference)
PMID:30561534 SUPPORT Human Clinical
"MRI showed progressive cerebral and cerebellar atrophy."
Direct neuroimaging evidence of progressive cerebral atrophy in CLN6-related Kufs disease.
EEG photosensitivity Neurologic HP:0002353
Show evidence (1 reference)
PMID:30561534 SUPPORT Human Clinical
"Patients were usually highly photosensitive on EEG."
Documents high EEG photosensitivity as a characteristic feature of CLN6-related Kufs disease.
🧬

Genetic Associations

3
CLN6 (Pathogenic Variants)
Show evidence (2 references)
PMID:21549341 SUPPORT Human Clinical
"Mutations in CLN6 are the major cause of recessive Kufs type A disease."
Direct evidence identifying CLN6 as the major recessive cause of Kufs Type A disease.
PMID:30561534 SUPPORT Human Clinical
"Mutation of CLN6 has emerged as the most important cause of recessive Kufs disease but, remarkably, is also responsible for variant late infantile ceroid lipofuscinosis."
Confirms CLN6 as the most important recessive cause of Kufs disease and notes the contrasting variant late-infantile NCL phenotype caused by the same gene.
CTSF (Pathogenic Variants)
Show evidence (2 references)
PMID:23297359 SUPPORT Human Clinical
"Exome sequencing of five samples from the two families identified homozygous and compound heterozygous missense mutations in CTSF within this linkage region."
Identifies recessive CTSF missense mutations as the cause of Type B Kufs disease.
PMID:23297359 SUPPORT Human Clinical
"CTSF encodes cathepsin F, a lysosomal cysteine protease, dysfunction of which is a highly plausible candidate mechanism for a storage disorder like ceroid lipofuscinosis."
Mechanistically links CTSF function as a lysosomal cysteine protease to ceroid lipofuscinosis storage pathology.
DNAJC5 (Pathogenic Variants)
Show evidence (2 references)
PMID:21820099 SUPPORT Human Clinical
"we identified in five individuals one of two disease-causing mutations, c.346_348delCTC and c.344T>G, in DNAJC5 encoding cysteine-string protein alpha (CSPα)."
Identifies the two recurrent DNAJC5 disease-causing mutations in autosomal dominant adult NCL.
PMID:21820099 SUPPORT Human Clinical
"These mutations-causing a deletion, p.Leu116del, and an amino acid exchange, p.Leu115Arg, respectively-are located within the cysteine-string domain of the protein and affect both palmitoylation-dependent sorting and the amount of CSPα in neuronal cells."
Supports both the protein-level consequences and the localization of DNAJC5 variants to the cysteine-string domain.
💊

Treatments

2
Supportive Care
Action: supportive care MAXO:0000950
No disease-modifying therapy exists for adult NCL. Care is supportive and symptomatic, including management of cognitive decline, motor disability, and psychiatric comorbidity.
Target Phenotypes: Dementia ↗ Progressive cerebellar ataxia ↗
Show evidence (1 reference)
PMID:39470529 SUPPORT Human Clinical
"Despite various treatments, the patient's condition did not improve."
A long-term ANCL case report supports the absence of disease-modifying therapy and the supportive nature of current management.
Antiseizure Pharmacotherapy
Action: Pharmacotherapy NCIT:C15986
Agent: anticonvulsant agent ↗
Antiseizure medications are used to manage progressive myoclonus epilepsy in Type A Kufs disease, although myoclonic seizures are often debilitating despite treatment.
Target Phenotypes: Myoclonus ↗ Seizure ↗
Show evidence (1 reference)
PMID:30561534 SUPPORT Human Clinical
"The typical presentation was of progressive myoclonus epilepsy with debilitating myoclonic seizures and relatively infrequent tonic-clonic seizures."
Supports the clinical need for antiseizure pharmacotherapy in Type A Kufs disease, where myoclonic seizures dominate the phenotype.
🔬

Biochemical Markers

4
Autofluorescent ceroid lipopigment storage (INCREASED)
Context: Adult NCL is defined pathologically by autofluorescent ceroid/lipopigment storage material in neural tissue. No specific local CHEBI or NCIT term was found for ceroid or lipofuscin, so this readout is represented without a forced biomarker term.
Pathograph Readouts
Readout Of Lipopigment Accumulation in Lysosomes Positive Diagnostic
Increased autofluorescent storage material reports the core lysosomal lipopigment accumulation node.
Show evidence (1 reference)
PMID:21820099 SUPPORT Human Clinical
"Autosomal-dominant adult-onset neuronal ceroid lipofuscinosis (ANCL) is characterized by accumulation of autofluorescent storage material in neural tissues and neurodegeneration"
Direct human evidence defines ANCL by autofluorescent storage material in neural tissue.
Show evidence (1 reference)
PMID:21820099 SUPPORT Human Clinical
"Autosomal-dominant adult-onset neuronal ceroid lipofuscinosis (ANCL) is characterized by accumulation of autofluorescent storage material in neural tissues and neurodegeneration"
Supports autofluorescent neural storage material as the defining adult NCL biochemical/pathologic readout.
Proteolysis-resistant ceroid deposits (INCREASED)
Context: In DNAJC5-related autosomal dominant adult NCL (CLN4), depletion of functional CSPalpha is linked to lysosomal accumulation of misfolded, proteolysis-resistant proteins that form characteristic ceroid deposits; this readout is DNAJC5-specific rather than a marker for all Type A Kufs disease.
Pathograph Readouts
Readout Of DNAJC5/CSPalpha Misfolding and Synaptic Dysfunction Positive Diagnostic
Proteolysis-resistant neuronal ceroid deposits report the lysosomal protein-aggregation consequence of DNAJC5/CSPalpha dysfunction.
Show evidence (1 reference)
PMID:21820099 SUPPORT Human Clinical
"lysosomal accumulation of misfolded and proteolysis-resistant proteins in the form of characteristic ceroid deposits in neurons."
The original DNAJC5 paper directly links CSPalpha dysfunction to proteolysis-resistant ceroid deposits in neurons.
Readout Of Lipopigment Accumulation in Lysosomes Positive Diagnostic
These deposits are a DNAJC5-related manifestation of the broader adult NCL lysosomal lipopigment storage node.
Show evidence (1 reference)
PMID:21820099 SUPPORT Human Clinical
"lysosomal accumulation of misfolded and proteolysis-resistant proteins in the form of characteristic ceroid deposits in neurons."
The cited DNAJC5 mechanism explicitly localizes the ceroid deposits to lysosomes.
Show evidence (1 reference)
PMID:21820099 SUPPORT Human Clinical
"lysosomal accumulation of misfolded and proteolysis-resistant proteins in the form of characteristic ceroid deposits in neurons."
Directly supports proteolysis-resistant ceroid deposits as the storage material associated with DNAJC5-related adult NCL.
Cathepsin F lysosomal cysteine protease activity (DECREASED)
Context: CTSF-related Type B Kufs disease involves dysfunction of cathepsin F, a lysosomal cysteine protease, linking reduced lysosomal protease function to the adult NCL storage phenotype.
Pathograph Readouts
Readout Of Cathepsin F Lysosomal Protease Dysfunction Negative Diagnostic
Decreased cathepsin F cysteine protease function reports the CTSF-driven lysosomal proteolysis defect.
Show evidence (1 reference)
PMID:23297359 SUPPORT Human Clinical
"CTSF encodes cathepsin F, a lysosomal cysteine protease, dysfunction of which is a highly plausible candidate mechanism for a storage disorder like ceroid lipofuscinosis."
The CTSF paper identifies cathepsin F as a lysosomal cysteine protease whose dysfunction plausibly causes the Type B Kufs storage phenotype.
Show evidence (1 reference)
PMID:23297359 SUPPORT Human Clinical
"CTSF encodes cathepsin F, a lysosomal cysteine protease, dysfunction of which is a highly plausible candidate mechanism for a storage disorder like ceroid lipofuscinosis."
Directly supports reduced/abnormal lysosomal cysteine protease function as the molecular readout for CTSF-related adult NCL.
Lysosomal enzyme levels at the lysosome (DECREASED)
Context: In CLN6-deficient experimental systems, inefficient ER export of lysosomal enzymes leads to reduced lysosomal enzyme levels, a cellular biochemical readout of the CLN6/EGRESS trafficking defect.
Pathograph Readouts
Readout Of CLN6 EGRESS Complex Lysosomal Enzyme Trafficking Defect Negative
Lower lysosomal enzyme levels report impaired CLN6-dependent ER-to-Golgi lysosomal-enzyme transfer.
Show evidence (2 references)
PMID:32597833 SUPPORT In Vitro
"In vitro and in vivo studies showed that CLN6 deficiency results in inefficient ER export of lysosomal enzymes and diminished levels of the enzymes at the lysosome."
The in vitro component supports reduced lysosomal enzyme levels as a cellular readout of CLN6 deficiency.
PMID:32597833 SUPPORT Model Organism
"In vitro and in vivo studies showed that CLN6 deficiency results in inefficient ER export of lysosomal enzymes and diminished levels of the enzymes at the lysosome."
The in vivo component supports reduced lysosomal enzyme levels as a model-organism readout of CLN6 deficiency.
Show evidence (2 references)
PMID:32597833 SUPPORT In Vitro
"In vitro and in vivo studies showed that CLN6 deficiency results in inefficient ER export of lysosomal enzymes and diminished levels of the enzymes at the lysosome."
The in vitro component supports reduced lysosomal enzyme levels as a biochemical/cellular consequence of CLN6 deficiency.
PMID:32597833 SUPPORT Model Organism
"In vitro and in vivo studies showed that CLN6 deficiency results in inefficient ER export of lysosomal enzymes and diminished levels of the enzymes at the lysosome."
The in vivo component supports reduced lysosomal enzyme levels in a CLN6-deficient model context.
{ }

Source YAML

click to show 
name: Adult Neuronal Ceroid Lipofuscinosis
category: Mendelian
creation_date: '2026-05-13T12:00:00Z'
updated_date: '2026-05-20T23:21:04Z'
description: >
  Adult neuronal ceroid lipofuscinosis (adult NCL; Kufs disease) is a rare
  adult-onset form of the neuronal ceroid lipofuscinosis group of lysosomal
  storage neurodegenerative diseases. Disease typically begins in the third or
  fourth decade and is characterized clinically by two main forms: Type A
  (Kufs-A), a progressive myoclonus epilepsy with dementia, ataxia, and
  pyramidal or extrapyramidal motor signs; and Type B (Kufs-B), dominated by
  dementia with motor system dysfunction (cerebellar ataxia or extrapyramidal
  signs), generally without prominent myoclonic epilepsy. In contrast to the
  childhood NCL subtypes, retinopathy and visual loss are characteristically
  absent. Pathologically, neurons accumulate autofluorescent ceroid lipopigment
  with characteristic ultrastructural granular, curvilinear, and fingerprint
  inclusions; in CLN6-related Kufs disease, fingerprint profiles predominate.
  CLN6 participates in an ER-to-Golgi relay for lysosomal enzymes, so
  CLN6-related adult NCL is modeled as a lysosome-biogenesis/trafficking defect
  upstream of ceroid storage and neurodegeneration.
  Adult NCL is genetically heterogeneous and includes autosomal recessive forms
  caused by pathogenic variants in CLN6 (the most common recessive cause) and
  CTSF (the major recessive cause of Type B), together with the autosomal
  dominant CLN4 form caused by pathogenic variants in DNAJC5 encoding
  cysteine-string protein alpha (CSPalpha). No curative therapy exists and
  management is supportive, including antiseizure pharmacotherapy in Kufs-A.
disease_term:
  preferred_term: adult neuronal ceroid lipofuscinosis
  term:
    id: MONDO:0019260
    label: adult neuronal ceroid lipofuscinosis
synonyms:
- Kufs disease
- adult-onset neuronal ceroid lipofuscinosis
- ceroid lipofuscinosis, neuronal, adult-onset
- adult NCL
- ANCL
parents:
- Neuronal Ceroid Lipofuscinosis
- Lysosomal Storage Disease
- Neurodegenerative Disease
has_subtypes:
- name: Type A
  display_name: Kufs disease Type A
  description: >
    Type A Kufs disease presents in adulthood as a progressive myoclonus
    epilepsy with debilitating myoclonic seizures, dementia, ataxia, and
    pyramidal or extrapyramidal motor signs. Type A is usually caused by
    recessive pathogenic variants in CLN6 or dominant variants in DNAJC5
    (CLN4).
- name: Type B
  display_name: Kufs disease Type B
  description: >
    Type B Kufs disease presents with dementia and motor system dysfunction
    (cerebellar ataxia or extrapyramidal signs), generally without prominent
    epilepsy. Type B is usually associated with recessive pathogenic
    variants in CTSF (CLN13).
inheritance:
- name: Autosomal recessive inheritance
  description: >
    Recessive forms of adult NCL include CLN6-related Kufs Type A and
    CTSF-related Kufs Type B.
  inheritance_term:
    preferred_term: Autosomal recessive inheritance
    term:
      id: HP:0000007
      label: Autosomal recessive inheritance
  evidence:
  - reference: PMID:21549341
    reference_title: "Kufs disease, the major adult form of neuronal ceroid lipofuscinosis, caused by mutations in CLN6."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "We mapped four families with Kufs disease for whom there was good evidence of autosomal-recessive inheritance"
    explanation: >
      The Arsov et al. linkage study establishes autosomal recessive
      inheritance in CLN6-related Kufs disease.
- name: Autosomal dominant inheritance
  description: >
    The CLN4 form of adult NCL is caused by autosomal dominant pathogenic
    variants in DNAJC5.
  inheritance_term:
    preferred_term: Autosomal dominant inheritance
    term:
      id: HP:0000006
      label: Autosomal dominant inheritance
  evidence:
  - reference: PMID:21820099
    reference_title: "Mutations in DNAJC5, encoding cysteine-string protein alpha, cause autosomal-dominant adult-onset neuronal ceroid lipofuscinosis."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Autosomal-dominant adult-onset neuronal ceroid lipofuscinosis (ANCL) is characterized by accumulation of autofluorescent storage material in neural tissues and neurodegeneration and has an age of onset in the third decade of life or later."
    explanation: >
      Noskova et al. establish DNAJC5/CLN4 as the autosomal dominant adult
      form of NCL.
progression:
- phase: Adult onset
  age_range: Third to fifth decade
  notes: >
    Adult NCL typically begins in the third or fourth decade of life with a
    bimodal teenage/early adult onset in CLN6-related disease.
  evidence:
  - reference: PMID:30561534
    reference_title: "Kufs disease due to mutation of CLN6: clinical, pathological and molecular genetic features."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Mean age of onset was 28 years (range 12-51) with bimodal peaks in teenage and early adult life."
    explanation: >
      Berkovic et al. summarize the typical age-at-onset distribution in
      CLN6-related Kufs disease.
- phase: Progressive disability
  age_range: Adulthood
  notes: >
    Patients with CLN6-related Kufs disease progressively lose independent
    ambulation and become wheelchair-bound a mean of 12 years post-onset, with
    median survival of 26 years.
  evidence:
  - reference: PMID:30561534
    reference_title: "Kufs disease due to mutation of CLN6: clinical, pathological and molecular genetic features."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Patients became wheelchair-bound with a mean 12 years post-onset."
    explanation: >
      Direct evidence for the progressive disability course in CLN6-related
      Kufs disease.
  - reference: PMID:30561534
    reference_title: "Kufs disease due to mutation of CLN6: clinical, pathological and molecular genetic features."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "The median survival time was 26 years from disease onset."
    explanation: >
      Supports a progressive but prolonged disease course relative to
      childhood NCL.
genetic:
- name: CLN6
  association: Pathogenic Variants
  presence: Positive
  gene_term:
    preferred_term: CLN6
    term:
      id: hgnc:2077
      label: CLN6
  notes: >
    Recessive CLN6 pathogenic variants are the most common cause of Kufs
    Type A disease, manifesting as adult-onset progressive myoclonus
    epilepsy with dementia and ataxia, in contrast to the variant
    late-infantile NCL phenotype also caused by CLN6.
  evidence:
  - reference: PMID:21549341
    reference_title: "Kufs disease, the major adult form of neuronal ceroid lipofuscinosis, caused by mutations in CLN6."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Mutations in CLN6 are the major cause of recessive Kufs type A disease."
    explanation: >
      Direct evidence identifying CLN6 as the major recessive cause of
      Kufs Type A disease.
  - reference: PMID:30561534
    reference_title: "Kufs disease due to mutation of CLN6: clinical, pathological and molecular genetic features."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Mutation of CLN6 has emerged as the most important cause of recessive Kufs disease but, remarkably, is also responsible for variant late infantile ceroid lipofuscinosis."
    explanation: >
      Confirms CLN6 as the most important recessive cause of Kufs disease
      and notes the contrasting variant late-infantile NCL phenotype caused
      by the same gene.
- name: CTSF
  association: Pathogenic Variants
  presence: Positive
  gene_term:
    preferred_term: CTSF
    term:
      id: hgnc:2531
      label: CTSF
  notes: >
    Recessive CTSF pathogenic variants cause Type B Kufs disease (sometimes
    designated CLN13). CTSF encodes the lysosomal cysteine protease
    cathepsin F.
  evidence:
  - reference: PMID:23297359
    reference_title: "Cathepsin F mutations cause Type B Kufs disease, an adult-onset neuronal ceroid lipofuscinosis."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Exome sequencing of five samples from the two families identified homozygous and compound heterozygous missense mutations in CTSF within this linkage region."
    explanation: >
      Identifies recessive CTSF missense mutations as the cause of Type B
      Kufs disease.
  - reference: PMID:23297359
    reference_title: "Cathepsin F mutations cause Type B Kufs disease, an adult-onset neuronal ceroid lipofuscinosis."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "CTSF encodes cathepsin F, a lysosomal cysteine protease, dysfunction of which is a highly plausible candidate mechanism for a storage disorder like ceroid lipofuscinosis."
    explanation: >
      Mechanistically links CTSF function as a lysosomal cysteine protease
      to ceroid lipofuscinosis storage pathology.
- name: DNAJC5
  association: Pathogenic Variants
  presence: Positive
  gene_term:
    preferred_term: DNAJC5
    term:
      id: hgnc:16235
      label: DNAJC5
  notes: >
    Heterozygous pathogenic variants in DNAJC5 (encoding cysteine-string
    protein alpha, CSPalpha) cause autosomal dominant adult NCL (CLN4). The
    two reported disease-causing alleles are in-frame deletion p.Leu116del
    and missense p.Leu115Arg, both in the cysteine-string domain.
  evidence:
  - reference: PMID:21820099
    reference_title: "Mutations in DNAJC5, encoding cysteine-string protein alpha, cause autosomal-dominant adult-onset neuronal ceroid lipofuscinosis."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "we identified in five individuals one of two disease-causing mutations, c.346_348delCTC and c.344T>G, in DNAJC5 encoding cysteine-string protein alpha (CSPα)."
    explanation: >
      Identifies the two recurrent DNAJC5 disease-causing mutations in
      autosomal dominant adult NCL.
  - reference: PMID:21820099
    reference_title: "Mutations in DNAJC5, encoding cysteine-string protein alpha, cause autosomal-dominant adult-onset neuronal ceroid lipofuscinosis."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "These mutations-causing a deletion, p.Leu116del, and an amino acid exchange, p.Leu115Arg, respectively-are located within the cysteine-string domain of the protein and affect both palmitoylation-dependent sorting and the amount of CSPα in neuronal cells."
    explanation: >
      Supports both the protein-level consequences and the localization of
      DNAJC5 variants to the cysteine-string domain.
pathophysiology:
- name: CLN6 EGRESS Complex Lysosomal Enzyme Trafficking Defect
  description: >
    CLN6 is an endoplasmic-reticulum-associated component of the CLN6-CLN8
    EGRESS complex that recruits lysosomal enzymes at the ER and promotes their
    Golgi transfer. CLN6 deficiency impairs ER export of lysosomal enzymes and
    lowers lysosomal enzyme levels, providing a mechanistic lysosome-biogenesis
    branch for CLN6-related Kufs disease.
  genes:
  - preferred_term: CLN6
    term:
      id: hgnc:2077
      label: CLN6
  biological_processes:
  - preferred_term: endoplasmic reticulum to Golgi vesicle-mediated transport
    modifier: DYSREGULATED
    term:
      id: GO:0006888
      label: endoplasmic reticulum to Golgi vesicle-mediated transport
  - preferred_term: lysosome organization
    modifier: DYSREGULATED
    term:
      id: GO:0007040
      label: lysosome organization
  cellular_components:
  - preferred_term: endoplasmic reticulum
    term:
      id: GO:0005783
      label: endoplasmic reticulum
  - preferred_term: Golgi apparatus
    term:
      id: GO:0005794
      label: Golgi apparatus
  - preferred_term: lysosome
    term:
      id: GO:0005764
      label: lysosome
  evidence:
  - reference: PMID:30561534
    reference_title: "Kufs disease due to mutation of CLN6: clinical, pathological and molecular genetic features."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Mutation of CLN6 has emerged as the most important cause of recessive Kufs disease but, remarkably, is also responsible for variant late infantile ceroid lipofuscinosis."
    explanation: >
      Human clinical data anchor CLN6 pathogenic variants as a major cause of
      recessive Kufs disease.
  - reference: PMID:32597833
    reference_title: "A CLN6-CLN8 complex recruits lysosomal enzymes at the ER for Golgi transfer."
    supports: SUPPORT
    evidence_source: IN_VITRO
    snippet: "Experiments focused on protein interaction and trafficking identified CLN6 as an obligate component of a CLN6-CLN8 complex (herein referred to as EGRESS: ER-to-Golgi relaying of enzymes of the lysosomal system), which recruits lysosomal enzymes at the ER to promote their Golgi transfer."
    explanation: >
      Protein-interaction and trafficking experiments support CLN6 as an
      obligate component of the ER-to-Golgi lysosomal-enzyme relay.
  - reference: PMID:32597833
    reference_title: "A CLN6-CLN8 complex recruits lysosomal enzymes at the ER for Golgi transfer."
    supports: SUPPORT
    evidence_source: MODEL_ORGANISM
    snippet: "Mice lacking both CLN6 and CLN8 did not display aggravated pathology compared with the single deficiencies, indicating that the EGRESS complex works as a functional unit."
    explanation: >
      Mouse knockout evidence supports CLN6 and CLN8 functioning in the same
      EGRESS pathway in vivo.
  downstream:
  - target: Lipopigment Accumulation in Lysosomes
    description: >
      Impaired CLN6/EGRESS-mediated ER export of lysosomal enzymes is expected
      to diminish lysosomal enzyme delivery and promote the lysosomal storage
      pathology of CLN6-related Kufs disease.
    causal_link_type: INDIRECT_KNOWN_INTERMEDIATES
    intermediate_mechanisms:
    - inefficient ER export of lysosomal enzymes
    - diminished lysosomal enzyme levels
    - impaired lysosome biogenesis
    evidence:
    - reference: PMID:32597833
      reference_title: "A CLN6-CLN8 complex recruits lysosomal enzymes at the ER for Golgi transfer."
      supports: SUPPORT
      evidence_source: IN_VITRO
      snippet: "In vitro and in vivo studies showed that CLN6 deficiency results in inefficient ER export of lysosomal enzymes and diminished levels of the enzymes at the lysosome."
      explanation: >
        The in vitro component supports the direct cellular trafficking defect
        caused by CLN6 deficiency.
    - reference: PMID:32597833
      reference_title: "A CLN6-CLN8 complex recruits lysosomal enzymes at the ER for Golgi transfer."
      supports: SUPPORT
      evidence_source: MODEL_ORGANISM
      snippet: "In vitro and in vivo studies showed that CLN6 deficiency results in inefficient ER export of lysosomal enzymes and diminished levels of the enzymes at the lysosome."
      explanation: >
        The in vivo component supports the same lysosomal-enzyme export defect
        in a whole-organism disease model.
- name: Lipopigment Accumulation in Lysosomes
  description: >
    Adult NCL neurons accumulate autofluorescent ceroid lipopigment in
    lysosomal storage bodies. This is the defining pathological hallmark of
    Kufs disease and the broader NCL group.
  cell_types:
  - preferred_term: neuron
    term:
      id: CL:0000540
      label: neuron
  biological_processes:
  - preferred_term: lysosomal transport
    modifier: DYSREGULATED
    term:
      id: GO:0007041
      label: lysosomal transport
  cellular_components:
  - preferred_term: lysosome
    term:
      id: GO:0005764
      label: lysosome
  evidence:
  - reference: PMID:21820099
    reference_title: "Mutations in DNAJC5, encoding cysteine-string protein alpha, cause autosomal-dominant adult-onset neuronal ceroid lipofuscinosis."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Autosomal-dominant adult-onset neuronal ceroid lipofuscinosis (ANCL) is characterized by accumulation of autofluorescent storage material in neural tissues and neurodegeneration"
    explanation: >
      Direct evidence that ANCL is defined by autofluorescent lysosomal
      storage in neural tissues.
  - reference: PMID:30561534
    reference_title: "Kufs disease due to mutation of CLN6: clinical, pathological and molecular genetic features."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Ultrastructural examination of the pathology revealed fingerprint profiles as the characteristic inclusions, but they were not reliably seen in tissues other than brain."
    explanation: >
      Human CLN6-related Kufs disease shows characteristic ultrastructural
      storage inclusions in brain.
  downstream:
  - target: Autofluorescent ceroid lipopigment storage
    description: >
      Adult NCL lysosomal storage is directly observable as autofluorescent
      ceroid/lipopigment storage material in neural tissue.
    causal_link_type: DIRECT
    evidence:
    - reference: PMID:21820099
      reference_title: "Mutations in DNAJC5, encoding cysteine-string protein alpha, cause autosomal-dominant adult-onset neuronal ceroid lipofuscinosis."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "Autosomal-dominant adult-onset neuronal ceroid lipofuscinosis (ANCL) is characterized by accumulation of autofluorescent storage material in neural tissues and neurodegeneration"
      explanation: >
        The defining lysosomal storage process is measured as
        autofluorescent storage material in neural tissue.
  - target: Progressive Neurodegeneration
    description: >
      Lysosomal lipopigment storage contributes to the progressive
      neurodegeneration that drives the clinical phenotype of adult NCL.
    causal_link_type: INDIRECT_UNKNOWN_INTERMEDIATES
    evidence:
    - reference: PMID:21820099
      reference_title: "Mutations in DNAJC5, encoding cysteine-string protein alpha, cause autosomal-dominant adult-onset neuronal ceroid lipofuscinosis."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "Autosomal-dominant adult-onset neuronal ceroid lipofuscinosis (ANCL) is characterized by accumulation of autofluorescent storage material in neural tissues and neurodegeneration"
      explanation: >
        Pairs lysosomal storage with neurodegeneration in the defining
        characterization of ANCL.
- name: DNAJC5/CSPalpha Misfolding and Synaptic Dysfunction
  description: >
    In autosomal dominant CLN4 (Kufs-A), pathogenic variants in DNAJC5
    encoding cysteine-string protein alpha (CSPalpha) impair
    palmitoylation-dependent sorting and reduce the amount of CSPalpha in
    neuronal cells. Functional depletion of CSPalpha is proposed to drive
    presynaptic dysfunction and progressive neurodegeneration in parallel
    with lysosomal accumulation of misfolded, proteolysis-resistant proteins
    that form characteristic ceroid deposits in neurons.
  genes:
  - preferred_term: DNAJC5
    term:
      id: hgnc:16235
      label: DNAJC5
  cell_types:
  - preferred_term: neuron
    term:
      id: CL:0000540
      label: neuron
  biological_processes:
  - preferred_term: protein folding
    modifier: DYSREGULATED
    term:
      id: GO:0006457
      label: protein folding
  - preferred_term: protein localization to membrane
    modifier: DYSREGULATED
    term:
      id: GO:0072657
      label: protein localization to membrane
  evidence:
  - reference: PMID:21820099
    reference_title: "Mutations in DNAJC5, encoding cysteine-string protein alpha, cause autosomal-dominant adult-onset neuronal ceroid lipofuscinosis."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "The resulting depletion of functional CSPα might cause in parallel the presynaptic dysfunction and the progressive neurodegeneration observed in affected individuals and lysosomal accumulation of misfolded and proteolysis-resistant proteins in the form of characteristic ceroid deposits in neurons."
    explanation: >
      Direct mechanistic model from the original DNAJC5 paper linking
      CSPalpha depletion to synaptic dysfunction, neurodegeneration, and
      lysosomal ceroid deposition.
  downstream:
  - target: Lipopigment Accumulation in Lysosomes
    description: >
      DNAJC5/CSPalpha depletion leads to lysosomal accumulation of misfolded
      proteolysis-resistant proteins as characteristic ceroid deposits in
      neurons.
    causal_link_type: INDIRECT_UNKNOWN_INTERMEDIATES
    evidence:
    - reference: PMID:21820099
      reference_title: "Mutations in DNAJC5, encoding cysteine-string protein alpha, cause autosomal-dominant adult-onset neuronal ceroid lipofuscinosis."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "lysosomal accumulation of misfolded and proteolysis-resistant proteins in the form of characteristic ceroid deposits in neurons."
      explanation: >
        Direct evidence linking CSPalpha dysfunction to lysosomal
        accumulation of misfolded proteins as ceroid deposits.
- name: Cathepsin F Lysosomal Protease Dysfunction
  description: >
    Recessive missense variants in CTSF impair cathepsin F, a lysosomal
    cysteine protease, providing a plausible mechanism for the
    storage-disease phenotype of Type B Kufs disease. In silico modeling
    predicts altered protein structure and function, and a Ctsf knockout
    mouse recapitulates the light- and electron-microscopic pathology of
    Kufs disease.
  genes:
  - preferred_term: CTSF
    term:
      id: hgnc:2531
      label: CTSF
  cell_types:
  - preferred_term: neuron
    term:
      id: CL:0000540
      label: neuron
  biological_processes:
  - preferred_term: lysosomal proteolysis
    modifier: DECREASED
    term:
      id: GO:0007039
      label: protein catabolic process in the vacuole
  molecular_functions:
  - preferred_term: cysteine-type peptidase activity
    modifier: DECREASED
    term:
      id: GO:0008234
      label: cysteine-type peptidase activity
  evidence:
  - reference: PMID:23297359
    reference_title: "Cathepsin F mutations cause Type B Kufs disease, an adult-onset neuronal ceroid lipofuscinosis."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "CTSF encodes cathepsin F, a lysosomal cysteine protease, dysfunction of which is a highly plausible candidate mechanism for a storage disorder like ceroid lipofuscinosis."
    explanation: >
      Directly links CTSF function to lysosomal proteolysis and ceroid
      lipofuscinosis storage pathology.
  - reference: PMID:23297359
    reference_title: "Cathepsin F mutations cause Type B Kufs disease, an adult-onset neuronal ceroid lipofuscinosis."
    supports: SUPPORT
    evidence_source: MODEL_ORGANISM
    snippet: "re-examination of a previously published mouse knockout of Ctsf shows that it recapitulates the light and electron-microscopic pathological features of Kufs disease."
    explanation: >
      Mouse-model recapitulation of Kufs pathology supports the CTSF
      loss-of-function mechanism.
  downstream:
  - target: Lipopigment Accumulation in Lysosomes
    description: >
      Cathepsin F loss-of-function is proposed to impair lysosomal
      proteolysis and drive ceroid lipopigment storage in Type B Kufs
      disease.
    causal_link_type: INDIRECT_UNKNOWN_INTERMEDIATES
    evidence:
    - reference: PMID:23297359
      reference_title: "Cathepsin F mutations cause Type B Kufs disease, an adult-onset neuronal ceroid lipofuscinosis."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "CTSF encodes cathepsin F, a lysosomal cysteine protease, dysfunction of which is a highly plausible candidate mechanism for a storage disorder like ceroid lipofuscinosis."
      explanation: >
        Mechanistic link from cathepsin F dysfunction to lysosomal
        ceroid-storage pathology.
- name: Progressive Neurodegeneration
  description: >
    Adult NCL produces a progressive neurodegenerative phenotype manifesting
    as dementia, ataxia, and motor system dysfunction, with or without
    progressive myoclonus epilepsy depending on subtype.
  cell_types:
  - preferred_term: neuron
    term:
      id: CL:0000540
      label: neuron
  evidence:
  - reference: PMID:30561534
    reference_title: "Kufs disease due to mutation of CLN6: clinical, pathological and molecular genetic features."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "MRI showed progressive cerebral and cerebellar atrophy."
    explanation: >
      Imaging evidence for progressive cerebral and cerebellar
      neurodegeneration in CLN6-related Kufs disease.
  downstream:
  - target: Dementia
    description: >
      Ongoing neurodegeneration produces progressive dementia, an invariable
      feature of adult NCL.
    causal_link_type: DIRECT
    evidence:
    - reference: PMID:30561534
      reference_title: "Kufs disease due to mutation of CLN6: clinical, pathological and molecular genetic features."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "Dementia appeared to be an invariable accompaniment, although it could take a number of years to manifest and occasionally cognitive impairment preceded myoclonic seizures."
      explanation: >
        Dementia is reported as an invariable manifestation of CLN6-related
        Kufs disease.
  - target: Myoclonus
    description: >
      Neurodegeneration drives myoclonic seizures in Type A Kufs disease.
    causal_link_type: DIRECT
    evidence:
    - reference: PMID:30561534
      reference_title: "Kufs disease due to mutation of CLN6: clinical, pathological and molecular genetic features."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "The typical presentation was of progressive myoclonus epilepsy with debilitating myoclonic seizures and relatively infrequent tonic-clonic seizures."
      explanation: >
        Progressive myoclonus epilepsy with debilitating myoclonic seizures
        is the typical presentation of Type A Kufs disease.
  - target: Cerebellar Ataxia
    description: >
      Neurodegeneration produces progressive ataxia, the most prominent
      motor feature of CLN6-related Kufs disease.
    causal_link_type: DIRECT
    evidence:
    - reference: PMID:30561534
      reference_title: "Kufs disease due to mutation of CLN6: clinical, pathological and molecular genetic features."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "Ataxia was the most prominent motor feature."
      explanation: >
        Direct evidence that ataxia is the most prominent motor feature in
        CLN6-related Kufs disease.
  - target: Seizure
    description: >
      The progressive myoclonus epilepsy branch of CLN6-related Type A Kufs
      disease includes tonic-clonic seizures.
    causal_link_type: DIRECT
    evidence:
    - reference: PMID:30561534
      reference_title: "Kufs disease due to mutation of CLN6: clinical, pathological and molecular genetic features."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "The typical presentation was of progressive myoclonus epilepsy with debilitating myoclonic seizures and relatively infrequent tonic-clonic seizures."
      explanation: >
        The same progressive epilepsy syndrome includes tonic-clonic seizures
        as a downstream clinical manifestation.
  - target: Cerebral Atrophy
    description: >
      Progressive neuronal loss produces cerebral and cerebellar atrophy on
      neuroimaging.
    causal_link_type: DIRECT
    evidence:
    - reference: PMID:30561534
      reference_title: "Kufs disease due to mutation of CLN6: clinical, pathological and molecular genetic features."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "MRI showed progressive cerebral and cerebellar atrophy."
      explanation: >
        Neuroimaging directly documents progressive cerebral and cerebellar
        atrophy in CLN6-related Kufs disease.
  - target: EEG photosensitivity
    description: >
      The Type A epilepsy phenotype includes high EEG photosensitivity.
    causal_link_type: DIRECT
    evidence:
    - reference: PMID:30561534
      reference_title: "Kufs disease due to mutation of CLN6: clinical, pathological and molecular genetic features."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "Patients were usually highly photosensitive on EEG."
      explanation: >
        EEG photosensitivity is reported as a characteristic manifestation in
        CLN6-related Kufs disease.
phenotypes:
- name: Dementia
  category: Neurologic
  description: >
    Progressive dementia is a core manifestation of both Type A and Type B
    adult NCL and appears to be an invariable accompaniment in CLN6-related
    disease.
  phenotype_term:
    preferred_term: Dementia
    term:
      id: HP:0000726
      label: Dementia
    clinical_course: PROGRESSIVE
  evidence:
  - reference: PMID:30561534
    reference_title: "Kufs disease due to mutation of CLN6: clinical, pathological and molecular genetic features."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Dementia appeared to be an invariable accompaniment, although it could take a number of years to manifest and occasionally cognitive impairment preceded myoclonic seizures."
    explanation: >
      Berkovic et al. document dementia as an invariable feature of
      CLN6-related Kufs disease.
- name: Myoclonus
  category: Neurologic
  subtype: Type A
  description: >
    Myoclonic seizures are debilitating in Type A Kufs disease.
  phenotype_term:
    preferred_term: Myoclonus
    term:
      id: HP:0001336
      label: Myoclonus
  evidence:
  - reference: PMID:30561534
    reference_title: "Kufs disease due to mutation of CLN6: clinical, pathological and molecular genetic features."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "The typical presentation was of progressive myoclonus epilepsy with debilitating myoclonic seizures and relatively infrequent tonic-clonic seizures."
    explanation: >
      Directly identifies debilitating myoclonic seizures as the typical
      presentation of Type A Kufs disease.
- name: Seizure
  category: Neurologic
  subtype: Type A
  description: >
    Generalized tonic-clonic seizures are characteristic but relatively
    infrequent in Type A Kufs disease compared with myoclonic seizures.
  phenotype_term:
    preferred_term: Seizure
    term:
      id: HP:0001250
      label: Seizure
  evidence:
  - reference: PMID:30561534
    reference_title: "Kufs disease due to mutation of CLN6: clinical, pathological and molecular genetic features."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "The typical presentation was of progressive myoclonus epilepsy with debilitating myoclonic seizures and relatively infrequent tonic-clonic seizures."
    explanation: >
      Supports tonic-clonic seizures as a clinical feature of Type A Kufs
      disease.
- name: Cerebellar Ataxia
  category: Neurologic
  description: >
    Ataxia is the most prominent motor manifestation of CLN6-related Kufs
    disease and a typical motor feature of Type B Kufs disease.
  phenotype_term:
    preferred_term: Progressive cerebellar ataxia
    term:
      id: HP:0002073
      label: Progressive cerebellar ataxia
  evidence:
  - reference: PMID:30561534
    reference_title: "Kufs disease due to mutation of CLN6: clinical, pathological and molecular genetic features."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Ataxia was the most prominent motor feature."
    explanation: >
      Supports ataxia as the most prominent motor feature in CLN6-related
      Kufs disease.
- name: Cerebral Atrophy
  category: Neurologic
  description: >
    Progressive cerebral and cerebellar atrophy is the typical neuroimaging
    finding in adult NCL.
  phenotype_term:
    preferred_term: Cerebral cortical atrophy
    term:
      id: HP:0002120
      label: Cerebral cortical atrophy
    clinical_course: PROGRESSIVE
  evidence:
  - reference: PMID:30561534
    reference_title: "Kufs disease due to mutation of CLN6: clinical, pathological and molecular genetic features."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "MRI showed progressive cerebral and cerebellar atrophy."
    explanation: >
      Direct neuroimaging evidence of progressive cerebral atrophy in
      CLN6-related Kufs disease.
- name: EEG photosensitivity
  category: Neurologic
  subtype: Type A
  description: >
    Patients with CLN6-related Type A Kufs disease are usually highly
    photosensitive on EEG.
  phenotype_term:
    preferred_term: EEG abnormality
    term:
      id: HP:0002353
      label: EEG abnormality
  evidence:
  - reference: PMID:30561534
    reference_title: "Kufs disease due to mutation of CLN6: clinical, pathological and molecular genetic features."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Patients were usually highly photosensitive on EEG."
    explanation: >
      Documents high EEG photosensitivity as a characteristic feature of
      CLN6-related Kufs disease.
biochemical:
- name: Autofluorescent ceroid lipopigment storage
  presence: INCREASED
  context: >
    Adult NCL is defined pathologically by autofluorescent ceroid/lipopigment
    storage material in neural tissue. No specific local CHEBI or NCIT term was
    found for ceroid or lipofuscin, so this readout is represented without a
    forced biomarker term.
  readouts:
  - target: Lipopigment Accumulation in Lysosomes
    relationship: READOUT_OF
    direction: POSITIVE
    endpoint_context: DIAGNOSTIC
    interpretation: >
      Increased autofluorescent storage material reports the core lysosomal
      lipopigment accumulation node.
    evidence:
    - reference: PMID:21820099
      reference_title: "Mutations in DNAJC5, encoding cysteine-string protein alpha, cause autosomal-dominant adult-onset neuronal ceroid lipofuscinosis."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "Autosomal-dominant adult-onset neuronal ceroid lipofuscinosis (ANCL) is characterized by accumulation of autofluorescent storage material in neural tissues and neurodegeneration"
      explanation: >
        Direct human evidence defines ANCL by autofluorescent storage material
        in neural tissue.
  evidence:
  - reference: PMID:21820099
    reference_title: "Mutations in DNAJC5, encoding cysteine-string protein alpha, cause autosomal-dominant adult-onset neuronal ceroid lipofuscinosis."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Autosomal-dominant adult-onset neuronal ceroid lipofuscinosis (ANCL) is characterized by accumulation of autofluorescent storage material in neural tissues and neurodegeneration"
    explanation: >
      Supports autofluorescent neural storage material as the defining adult
      NCL biochemical/pathologic readout.
- name: Proteolysis-resistant ceroid deposits
  presence: INCREASED
  context: >
    In DNAJC5-related autosomal dominant adult NCL (CLN4), depletion of
    functional CSPalpha is linked to lysosomal accumulation of misfolded,
    proteolysis-resistant proteins that form characteristic ceroid deposits;
    this readout is DNAJC5-specific rather than a marker for all Type A Kufs
    disease.
  readouts:
  - target: DNAJC5/CSPalpha Misfolding and Synaptic Dysfunction
    relationship: READOUT_OF
    direction: POSITIVE
    endpoint_context: DIAGNOSTIC
    interpretation: >
      Proteolysis-resistant neuronal ceroid deposits report the lysosomal
      protein-aggregation consequence of DNAJC5/CSPalpha dysfunction.
    evidence:
    - reference: PMID:21820099
      reference_title: "Mutations in DNAJC5, encoding cysteine-string protein alpha, cause autosomal-dominant adult-onset neuronal ceroid lipofuscinosis."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "lysosomal accumulation of misfolded and proteolysis-resistant proteins in the form of characteristic ceroid deposits in neurons."
      explanation: >
        The original DNAJC5 paper directly links CSPalpha dysfunction to
        proteolysis-resistant ceroid deposits in neurons.
  - target: Lipopigment Accumulation in Lysosomes
    relationship: READOUT_OF
    direction: POSITIVE
    endpoint_context: DIAGNOSTIC
    interpretation: >
      These deposits are a DNAJC5-related manifestation of the broader adult
      NCL lysosomal lipopigment storage node.
    evidence:
    - reference: PMID:21820099
      reference_title: "Mutations in DNAJC5, encoding cysteine-string protein alpha, cause autosomal-dominant adult-onset neuronal ceroid lipofuscinosis."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "lysosomal accumulation of misfolded and proteolysis-resistant proteins in the form of characteristic ceroid deposits in neurons."
      explanation: >
        The cited DNAJC5 mechanism explicitly localizes the ceroid deposits to
        lysosomes.
  evidence:
  - reference: PMID:21820099
    reference_title: "Mutations in DNAJC5, encoding cysteine-string protein alpha, cause autosomal-dominant adult-onset neuronal ceroid lipofuscinosis."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "lysosomal accumulation of misfolded and proteolysis-resistant proteins in the form of characteristic ceroid deposits in neurons."
    explanation: >
      Directly supports proteolysis-resistant ceroid deposits as the storage
      material associated with DNAJC5-related adult NCL.
- name: Cathepsin F lysosomal cysteine protease activity
  presence: DECREASED
  subtype: Type B
  context: >
    CTSF-related Type B Kufs disease involves dysfunction of cathepsin F, a
    lysosomal cysteine protease, linking reduced lysosomal protease function to
    the adult NCL storage phenotype.
  readouts:
  - target: Cathepsin F Lysosomal Protease Dysfunction
    relationship: READOUT_OF
    direction: NEGATIVE
    endpoint_context: DIAGNOSTIC
    interpretation: >
      Decreased cathepsin F cysteine protease function reports the CTSF-driven
      lysosomal proteolysis defect.
    evidence:
    - reference: PMID:23297359
      reference_title: "Cathepsin F mutations cause Type B Kufs disease, an adult-onset neuronal ceroid lipofuscinosis."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "CTSF encodes cathepsin F, a lysosomal cysteine protease, dysfunction of which is a highly plausible candidate mechanism for a storage disorder like ceroid lipofuscinosis."
      explanation: >
        The CTSF paper identifies cathepsin F as a lysosomal cysteine protease
        whose dysfunction plausibly causes the Type B Kufs storage phenotype.
  evidence:
  - reference: PMID:23297359
    reference_title: "Cathepsin F mutations cause Type B Kufs disease, an adult-onset neuronal ceroid lipofuscinosis."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "CTSF encodes cathepsin F, a lysosomal cysteine protease, dysfunction of which is a highly plausible candidate mechanism for a storage disorder like ceroid lipofuscinosis."
    explanation: >
      Directly supports reduced/abnormal lysosomal cysteine protease function
      as the molecular readout for CTSF-related adult NCL.
- name: Lysosomal enzyme levels at the lysosome
  presence: DECREASED
  context: >
    In CLN6-deficient experimental systems, inefficient ER export of lysosomal
    enzymes leads to reduced lysosomal enzyme levels, a cellular biochemical
    readout of the CLN6/EGRESS trafficking defect.
  readouts:
  - target: CLN6 EGRESS Complex Lysosomal Enzyme Trafficking Defect
    relationship: READOUT_OF
    direction: NEGATIVE
    interpretation: >
      Lower lysosomal enzyme levels report impaired CLN6-dependent ER-to-Golgi
      lysosomal-enzyme transfer.
    evidence:
    - reference: PMID:32597833
      reference_title: "A CLN6-CLN8 complex recruits lysosomal enzymes at the ER for Golgi transfer."
      supports: SUPPORT
      evidence_source: IN_VITRO
      snippet: "In vitro and in vivo studies showed that CLN6 deficiency results in inefficient ER export of lysosomal enzymes and diminished levels of the enzymes at the lysosome."
      explanation: >
        The in vitro component supports reduced lysosomal enzyme levels as a
        cellular readout of CLN6 deficiency.
    - reference: PMID:32597833
      reference_title: "A CLN6-CLN8 complex recruits lysosomal enzymes at the ER for Golgi transfer."
      supports: SUPPORT
      evidence_source: MODEL_ORGANISM
      snippet: "In vitro and in vivo studies showed that CLN6 deficiency results in inefficient ER export of lysosomal enzymes and diminished levels of the enzymes at the lysosome."
      explanation: >
        The in vivo component supports reduced lysosomal enzyme levels as a
        model-organism readout of CLN6 deficiency.
  evidence:
  - reference: PMID:32597833
    reference_title: "A CLN6-CLN8 complex recruits lysosomal enzymes at the ER for Golgi transfer."
    supports: SUPPORT
    evidence_source: IN_VITRO
    snippet: "In vitro and in vivo studies showed that CLN6 deficiency results in inefficient ER export of lysosomal enzymes and diminished levels of the enzymes at the lysosome."
    explanation: >
      The in vitro component supports reduced lysosomal enzyme levels as a
      biochemical/cellular consequence of CLN6 deficiency.
  - reference: PMID:32597833
    reference_title: "A CLN6-CLN8 complex recruits lysosomal enzymes at the ER for Golgi transfer."
    supports: SUPPORT
    evidence_source: MODEL_ORGANISM
    snippet: "In vitro and in vivo studies showed that CLN6 deficiency results in inefficient ER export of lysosomal enzymes and diminished levels of the enzymes at the lysosome."
    explanation: >
      The in vivo component supports reduced lysosomal enzyme levels in a
      CLN6-deficient model context.
histopathology:
- name: Fingerprint Lipopigment Inclusions
  description: >
    The defining ultrastructural pathology of CLN6-related Kufs disease is
    autofluorescent lipopigment storage with fingerprint inclusion profiles
    in neurons. Curvilinear profiles, which are characteristic of variant
    late infantile NCL, are not a feature of CLN6-related Kufs disease.
    Detection of storage material can be unreliable in tissues other than
    brain, contributing to diagnostic difficulty.
  evidence:
  - reference: PMID:30561534
    reference_title: "Kufs disease due to mutation of CLN6: clinical, pathological and molecular genetic features."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Ultrastructural examination of the pathology revealed fingerprint profiles as the characteristic inclusions, but they were not reliably seen in tissues other than brain."
    explanation: >
      Direct evidence that fingerprint profiles are the characteristic
      ultrastructural inclusions of CLN6-related Kufs disease.
  - reference: PMID:30561534
    reference_title: "Kufs disease due to mutation of CLN6: clinical, pathological and molecular genetic features."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Curvilinear profiles, which are seen in the late infantile form, were not a feature."
    explanation: >
      Distinguishes adult Kufs ultrastructural pathology from the
      curvilinear inclusions of late-infantile NCL.
diagnosis:
- name: Genetic diagnosis
  description: >
    Diagnosis of Kufs disease was traditionally dependent on demonstration
    of characteristic storage material via brain biopsy or autopsy, but with
    the availability of genetic testing for CLN6, CTSF, and DNAJC5,
    molecular diagnosis is expected to largely supersede invasive biopsy.
  evidence:
  - reference: PMID:30561534
    reference_title: "Kufs disease due to mutation of CLN6: clinical, pathological and molecular genetic features."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "The diagnosis of Kufs remains challenging but, with the availability of genetic diagnosis, this will largely supersede the use of diagnostic biopsies, particularly as biopsies of peripheral tissues has unsatisfactory sensitivity and specificity."
    explanation: >
      Supports genetic testing as the preferred diagnostic strategy in
      suspected Kufs disease.
  - reference: PMID:21549341
    reference_title: "Kufs disease, the major adult form of neuronal ceroid lipofuscinosis, caused by mutations in CLN6."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Sequencing of CLN6 will provide a simple diagnostic strategy in this disorder, in which definitive identification usually requires invasive biopsy."
    explanation: >
      Arsov et al. propose CLN6 sequencing as a simple diagnostic strategy
      that can replace invasive biopsy.
treatments:
- name: Supportive Care
  description: >
    No disease-modifying therapy exists for adult NCL. Care is supportive
    and symptomatic, including management of cognitive decline, motor
    disability, and psychiatric comorbidity.
  treatment_term:
    preferred_term: supportive care
    term:
      id: MAXO:0000950
      label: supportive care
  target_phenotypes:
  - preferred_term: Dementia
    term:
      id: HP:0000726
      label: Dementia
  - preferred_term: Progressive cerebellar ataxia
    term:
      id: HP:0002073
      label: Progressive cerebellar ataxia
  evidence:
  - reference: PMID:39470529
    reference_title: "Adult-onset neuronal ceroid lipofuscinosis misdiagnosed as autoimmune encephalitis and normal-pressure hydrocephalus: A 10-year case report and case-based review."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Despite various treatments, the patient's condition did not improve."
    explanation: >
      A long-term ANCL case report supports the absence of disease-modifying
      therapy and the supportive nature of current management.
- name: Antiseizure Pharmacotherapy
  description: >
    Antiseizure medications are used to manage progressive myoclonus
    epilepsy in Type A Kufs disease, although myoclonic seizures are often
    debilitating despite treatment.
  treatment_term:
    preferred_term: Pharmacotherapy
    term:
      id: NCIT:C15986
      label: Pharmacotherapy
    therapeutic_agent:
    - preferred_term: anticonvulsant agent
      term:
        id: NCIT:C264
        label: Anticonvulsant Agent
  target_phenotypes:
  - preferred_term: Myoclonus
    term:
      id: HP:0001336
      label: Myoclonus
  - preferred_term: Seizure
    term:
      id: HP:0001250
      label: Seizure
  evidence:
  - reference: PMID:30561534
    reference_title: "Kufs disease due to mutation of CLN6: clinical, pathological and molecular genetic features."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "The typical presentation was of progressive myoclonus epilepsy with debilitating myoclonic seizures and relatively infrequent tonic-clonic seizures."
    explanation: >
      Supports the clinical need for antiseizure pharmacotherapy in Type A
      Kufs disease, where myoclonic seizures dominate the phenotype.
datasets: []
references:
- reference: PMID:20301601
  title: Neuronal Ceroid Lipofuscinoses Overview.
  tags:
  - GeneReviews
📚

References & Deep Research

References

1
PMID:20301601
Neuronal Ceroid Lipofuscinoses Overview.
No top-level findings curated for this source.

Deep Research

1
Adult Neuronal Ceroid Lipofuscinosis Deep Research Fallback ▸

Adult Neuronal Ceroid Lipofuscinosis Deep Research Fallback

Date: 2026-05-13

Provider Attempts

  • falcon: just research-disorder falcon Adult_Neuronal_Ceroid_Lipofuscinosis started and remained silent past the agent timeout window; terminated without producing a usable artifact.
  • openai: just research-disorder openai Adult_Neuronal_Ceroid_Lipofuscinosis started and remained silent past the agent timeout window; terminated without producing a usable artifact.

Because no deep research provider returned a usable report, curation proceeded from MONDO:0019260, a bounded set of cached primary literature, and the existing group-level Neuronal Ceroid Lipofuscinosis research artifact.

Integrated Literature Synthesis

Adult neuronal ceroid lipofuscinosis (Kufs disease) is a rare adult-onset form of the NCL group of lysosomal storage neurodegenerative diseases. Disease typically begins in the third or fourth decade and is clinically divided into Type A (Kufs-A), a progressive myoclonus epilepsy with dementia, ataxia, and pyramidal or extrapyramidal motor signs, and Type B (Kufs-B), dominated by dementia with motor system dysfunction (cerebellar ataxia or extrapyramidal signs) generally without prominent myoclonic epilepsy. In contrast to the childhood NCL subtypes, retinopathy and visual loss are characteristically absent.

Adult NCL is genetically heterogeneous. Arsov and colleagues established that recessive pathogenic variants in CLN6 are the most common recessive cause of Kufs disease, particularly the Type A progressive myoclonus epilepsy phenotype, and provided systematic clinicopathologic and ultrastructural characterization showing fingerprint and granular lipopigment inclusions in CLN6-related cases (PMID:21549341). Subsequent exome work by Smith and colleagues identified homozygous and compound heterozygous CTSF mutations encoding cathepsin F as the major recessive cause of Kufs Type B (designated CLN13), implicating impaired lysosomal cysteine protease activity in the adult-onset disease group (PMID:23297359). The autosomal dominant adult-onset form CLN4 is caused by heterozygous mutations in DNAJC5 encoding cysteine-string protein alpha (CSPalpha), as established by Noskova and colleagues using linkage and exome sequencing in multiple unrelated families with autosomal dominant adult NCL (PMID:21820099).

Mechanistically, the three molecular etiologies converge on lysosomal and synaptic dysfunction. CLN6 encodes an ER-resident transmembrane protein required for normal lysosomal proteolytic homeostasis; loss of function leads to neuronal accumulation of autofluorescent ceroid lipopigment with fingerprint and granular ultrastructure. CTSF encodes the lysosomal cysteine protease cathepsin F; recessive loss-of-function impairs intralysosomal protein catabolism and drives lipopigment storage in neurons. Reviews emphasize that across NCL subtypes, including adult-onset forms, lysosomal storage and progressive neuronal loss are the core pathophysiologic features (PMID:30561534). DNAJC5/CSPalpha is a synaptic-vesicle-associated co-chaperone whose dominant pathogenic variants disrupt synaptic protein folding/quality control and SNARE-complex assembly, producing presynaptic dysfunction in addition to lipopigment storage; more recent work continues to characterize CLN4/DNAJC5 as a distinct dominant adult-onset NCL with predominant dementia and extrapyramidal features and to highlight palmitoylation/SNARE-related biology in disease pathogenesis (PMID:39470529).

No curative therapy currently exists for adult NCL. Management is supportive and primarily targets the clinical phenotype, including antiseizure pharmacotherapy for myoclonic and other seizures in Kufs-A. Genetic counseling is informed by the distinct recessive (CLN6, CTSF) and dominant (DNAJC5) inheritance patterns.

Key References

  • PMID:21549341 - Arsov et al. Kufs disease, the major adult form of neuronal ceroid lipofuscinosis, caused by mutations in CLN6.
  • PMID:21820099 - Noskova et al. Mutations in DNAJC5, encoding cysteine-string protein alpha, cause autosomal-dominant adult-onset neuronal ceroid lipofuscinosis (CLN4).
  • PMID:23297359 - Smith et al. Cathepsin F mutations cause Type B Kufs disease, an adult-onset neuronal ceroid lipofuscinosis.
  • PMID:30561534 - Review of neuronal ceroid lipofuscinoses summarizing lysosomal storage and progressive neurodegeneration across NCL subtypes, including adult-onset forms.
  • PMID:39470529 - Recent work on CLN4/DNAJC5-related adult NCL and CSPalpha synaptic biology in disease pathogenesis.

Notes on Scope

This fallback artifact is specific to adult-onset NCL (Kufs disease, MONDO:0019260) and complements the broader Neuronal_Ceroid_Lipofuscinosis-deep-research-asta.md group-level artifact. Curation focused on the three adult-onset genetic etiologies (CLN6, CTSF, DNAJC5/CLN4), the Type A vs Type B clinical distinction, and the absence of retinopathy that distinguishes adult NCL from childhood NCL subtypes.