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1.

Ceroid lipofuscinosis, neuronal, 6B (Kufs type)

Neuronal ceroid lipofuscinosis-6B (CLN6B) is an autosomal recessive form of 'Kufs disease,' which refers in general to adult-onset neuronal ceroid lipofuscinosis without retinal involvement. CLN6B is a neurodegenerative disorder with a mean onset of symptoms at around age 28 years, although onset in the teens and later adulthood may also occur. Patients typically present with progressive myoclonus epilepsy, ataxia, loss of motor function, dysarthria, progressive dementia, and progressive cerebral and cerebellar atrophy on brain imaging. Ultrastructural examination typically shows fingerprint profiles and granular osmiophilic deposits in some tissues, including brain samples (summary by Arsov et al., 2011 and Berkovic et al., 2019). However, pathologic findings in peripheral tissues in adults is not as accurate for diagnosis as it is in children with the disease (Cherian et al., 2021). For a general phenotypic description and a discussion of genetic heterogeneity of CLN, see CLN1 (256730). [from OMIM]

MedGen UID:
1794137
Concept ID:
C5561927
Disease or Syndrome
2.

Ceroid lipofuscinosis, neuronal, 6A

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]

MedGen UID:
1790423
Concept ID:
C5551375
Disease or Syndrome

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