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Ceroid lipofuscinosis, neuronal, 6A(vLINCL; CLN6A)

MedGen UID:
Concept ID:
Disease or Syndrome
Synonyms: CLN6 Disease; CLN6-Related Neuronal Ceroid-Lipofuscinosis; Neuronal ceroid lipofuscinosis 6; Neuronal ceroid lipofuscinosis, Gypsy/Indian early juvenile variant
Modes of inheritance:
Autosomal recessive inheritance
MedGen UID:
Concept ID:
Intellectual Product
Source: Orphanet
A mode of inheritance that is observed for traits related to a gene encoded on one of the autosomes (i.e., the human chromosomes 1-22) in which a trait manifests in individuals with two pathogenic alleles, either homozygotes (two copies of the same mutant allele) or compound heterozygotes (whereby each copy of a gene has a distinct mutant allele).
Gene (location): CLN6 (15q23)
Monarch Initiative: MONDO:0011144
OMIM®: 601780
Orphanet: ORPHA228363


Neuronal ceroid lipofuscinosis-6A (CLN6A) is an autosomal recessive neurodegenerative disorder with a variable age at onset in the first years of life after normal early development. Affected individuals have progressive decline of neurologic function, including visual deterioration in most, cognitive impairment, loss of motor function, and seizures. As with all CLNs, CLN6A is characterized pathologically by the intracellular accumulation of autofluorescent lipopigment storage material in different patterns ultrastructurally. The lipopigment patterns observed most often in CLN6A comprises mixed combinations of 'curvilinear' and 'fingerprint' profiles (summary by Sharp et al., 2003; Mole et al., 2005). For a discussion of genetic heterogeneity of CLN, see CLN1 (256730). [from OMIM]

Additional description

From MedlinePlus Genetics
CLN6 disease is an inherited disorder that primarily affects the nervous system. The signs and symptoms of this condition typically begin between early and late childhood, but sometimes they can appear in adulthood.

Most children with CLN6 disease initially experience the loss of previously acquired skills (developmental regression). Affected individuals can also develop recurrent seizures (epilepsy), difficulty coordinating movements (ataxia), muscle twitches (myoclonus), impaired speech (dysarthria), and vision loss. The movement problems worsen over time until affected children cannot walk, stand, or sit without assistance. Intellectual function also declines over time. Most children with CLN6 disease do not survive into adulthood.

CLN6 disease is one of a group of disorders known as neuronal ceroid lipofuscinoses (NCLs), which may also be collectively referred to as Batten disease. All these disorders affect the nervous system and typically cause worsening problems with vision, movement, and thinking ability. The different NCLs are distinguished by their genetic cause. Each disease type is given the designation "CLN," meaning ceroid lipofuscinosis, neuronal, and then a number to indicate its subtype.

Some people with CLN6 disease do not show signs or symptoms of the condition until adulthood, typically after age 30. These individuals can have epilepsy, ataxia, dysarthria, and a progressive loss of intellectual function. CLN6 disease usually does not cause vision loss in affected adults. Adults with this condition do not often survive more than 10 years after diagnosis.  https://medlineplus.gov/genetics/condition/cln6-disease

Clinical features

From HPO
MedGen UID:
Concept ID:
Sign or Symptom
A seizure is an intermittent abnormality of nervous system physiology characterized by a transient occurrence of signs and/or symptoms due to abnormal excessive or synchronous neuronal activity in the brain.
Motor deterioration
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Loss of previously present motor (i.e., movement) abilities.
Abnormal nervous system electrophysiology
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Pathologic Function
An abnormality of the function of the electrical signals with which nerve cells communicate with each other or with muscles as measured by electrophysiological investigations.
Increased neuronal autofluorescent lipopigment
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Concept ID:
Lipofuscin, a generic term applied to autofluorescent lipopigment, is a mixture of protein and lipid that accumulates in most aging cells, particularly those involved in high lipid turnover (e.g., the adrenal medulla) or phagocytosis of other cell types (e g., the retinal pigment epithelium or RPE; macrophage). This term pertains if there is an increase in the neuronal accumulation of lipofuscin (also known as autofluorescent lipoprotein) more than expected for the age of the patient.
Retinal degeneration
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A nonspecific term denoting degeneration of the retinal pigment epithelium and/or retinal photoreceptor cells.
Progressive visual loss
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A reduction of previously attained ability to see.
Fingerprint intracellular accumulation of autofluorescent lipopigment storage material
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Concept ID:
An intracellular accumulation of autofluorescent lipopigment storage material in a trabecular or fingerprint-like pattern.
Curvilinear intracellular accumulation of autofluorescent lipopigment storage material
MedGen UID:
Concept ID:
An intracellular accumulation of autofluorescent lipopigment storage material in a curved pattern.

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