Batten's disease: clues to neuronal protein catabolism in lysosomes
- PMID: 10740217
- DOI: 10.1002/(SICI)1097-4547(20000415)60:2<133::AID-JNR1>3.0.CO;2-3
Batten's disease: clues to neuronal protein catabolism in lysosomes
Abstract
Neuronal ceroid lipofuscinosis (Batten disease) encompasses a group of 8 or more inherited lysosomal storage diseases, with an overall frequency of 1 in 12,500 births. All are characterized by progressive blindness and dementia and were initially classified on the basis of age of onset, clinical phenotype and ultrastructural characterization of the storage material as granular osmiophilic deposits, curvilinear bodies or fingerprint bodies. Recent research has shown that the various forms of Batten disease result from mutations in at least 8 genes which code for proteins involved in different aspects of lysosomal protein catabolism. These include palmitoyl:protein thioesterase 1 (CLN1), tripeptidylpeptidase 1 (CLN2), cathepsin D (CLN8), and two membrane proteins of unknown function (CLN3 and CLN5). Biochemically, Batten disease is characterized by the accumulation in neurons and other cells of an autofluorescent pigment which has resisted many attempts at analysis. In this review we attempt to relate our current understanding of the nature of the storage material in Batten disease with this genetic information. We conclude that the 8 genes probably code for proteins which facilitate the degradation of post-translationally modified proteins in lysosomes, suggesting that the turnover of these proteins is highest in cortical neurons.
Copyright 2000 Wiley-Liss, Inc.
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