Compound heterozygous genotype is associated with protracted juvenile neuronal ceroid lipofuscinosis

Annals of Neurology
K E WisniewskiT M Wisniewski

Abstract

We present a clinicopathological study and the first molecular genetic analysis of a family with 2 siblings affected by a rare, protracted form of juvenile neuronal ceroid lipofuscinosis (JNCL). Molecular genetic studies showed that both siblings, in addition to being heterozygous for the 1.02-kb CLN3 deletion, a common mutation in JNCL, also had a G-to-A missense mutation at nucleotide 1,020 of the CLN3 cDNA sequence on the non-1.02-kb deletion chromosomes. This point mutation resulted in a substitution of glutamic acid by lysine at position 295 of the CLN3 protein. Thus, a single point mutation at residue 295 of the CLN3 protein in protracted JNCL may underlie the phenotype in this form, which differs from that in classic JNCL.

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Citations

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Batten Disease

Batten Disease is a group of nervous system disorders known as neuronal ceroid lipofuscinosis. This feed focuses on neurobiological and neuropathological aspects of this disease.