PMID- 26160911 OWN - NLM STAT- MEDLINE DCOM- 20160706 LR - 20181113 IS - 1460-2083 (Electronic) IS - 0964-6906 (Print) IS - 0964-6906 (Linking) VI - 24 IP - 19 DP - 2015 Oct 1 TI - Cln1 gene disruption in mice reveals a common pathogenic link between two of the most lethal childhood neurodegenerative lysosomal storage disorders. PG - 5416-32 LID - 10.1093/hmg/ddv266 [doi] AB - Neurodegeneration is a devastating manifestation in the majority of >50 lysosomal storage disorders (LSDs). Neuronal ceroid lipofuscinoses (NCLs) are the most common childhood neurodegenerative LSDs. Mutations in 13 different genes (called CLNs) underlie various types of NCLs, of which the infantile NCL (INCL) and congenital NCL (CNCL) are the most lethal. Although inactivating mutations in the CLN1 gene encoding palmitoyl-protein thioesterase-1 (PPT1) cause INCL, those in the CLN10 gene encoding cathepsin D (CD) underlie CNCL. PPT1 is a lysosomal thioesterase that cleaves the thioester linkage in S-acylated proteins required for their degradation by lysosomal hydrolases like CD. Thus, PPT1 deficiency causes lysosomal accumulation of these lipidated proteins (major constituents of ceroid) leading to INCL. We sought to determine whether there is a common pathogenic link between INCL and CNCL. Using biochemical, histological and confocal microscopic analyses of brain tissues and cells from Cln1(-/-) mice that mimic INCL, we uncovered that Cln10/CD is overexpressed. Although synthesized in the endoplasmic reticulum, the CD-precursor protein (pro-CD) is transported through endosome to the lysosome where it is proteolytically processed to enzymatically active-CD. We found that despite Cln10 overexpression, the maturation of pro-CD to enzymatically active-CD in lysosome was disrupted. This defect impaired lysosomal degradative function causing accumulation of undegraded cargo in lysosome leading to INCL. Notably, treatment of intact Cln1(-/-) mice as well as cultured brain cells derived from these animals with a thioesterase-mimetic small molecule, N-tert-butyl-hydroxylamine, ameliorated the CD-processing defect. Our findings are significant in that they define a pathway in which Cln1 mutations disrupt the maturation of a major degradative enzyme in lysosome contributing to neuropathology in INCL and suggest that lysosomal CD deficiency is a common pathogenic link between INCL and CNCL. CI - Published by Oxford University Press 2015. This work is written by (a) US Government employee(s) and is in the public domain in the US. FAU - Chandra, Goutam AU - Chandra G AD - Section on Developmental Genetics, Program on Developmental Endocrinology and Genetics, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892-1830, USA. FAU - Bagh, Maria B AU - Bagh MB AD - Section on Developmental Genetics, Program on Developmental Endocrinology and Genetics, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892-1830, USA. FAU - Peng, Shiyong AU - Peng S AD - Section on Developmental Genetics, Program on Developmental Endocrinology and Genetics, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892-1830, USA. FAU - Saha, Arjun AU - Saha A AD - Section on Developmental Genetics, Program on Developmental Endocrinology and Genetics, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892-1830, USA. FAU - Sarkar, Chinmoy AU - Sarkar C AD - Section on Developmental Genetics, Program on Developmental Endocrinology and Genetics, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892-1830, USA. FAU - Moralle, Matthew AU - Moralle M AD - Section on Developmental Genetics, Program on Developmental Endocrinology and Genetics, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892-1830, USA. FAU - Zhang, Zhongjian AU - Zhang Z AD - Section on Developmental Genetics, Program on Developmental Endocrinology and Genetics, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892-1830, USA. FAU - Mukherjee, Anil B AU - Mukherjee AB AD - Section on Developmental Genetics, Program on Developmental Endocrinology and Genetics, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892-1830, USA mukherja@exchange.nih.gov. LA - eng GR - Intramural NIH HHS/United States PT - Journal Article PT - Research Support, N.I.H., Intramural DEP - 20150709 PL - England TA - Hum Mol Genet JT - Human molecular genetics JID - 9208958 RN - 0 (Hydroxylamines) RN - 16649-50-6 (N-tert-butylhydroxylamine) RN - EC 3.1.2.- (Thiolester Hydrolases) RN - EC 3.1.2.22 (palmitoyl-protein thioesterase) RN - EC 3.4.23.5 (Cathepsin D) RN - EC 3.4.23.5 (Ctsd protein, mouse) SB - IM MH - Animals MH - Brain/*metabolism/pathology MH - Cathepsin D/deficiency/*metabolism MH - Child MH - Disease Models, Animal MH - Gene Expression Regulation MH - Humans MH - Hydroxylamines/administration & dosage/therapeutic use MH - Lysosomes/metabolism MH - Mice MH - Mutation MH - Neuronal Ceroid-Lipofuscinoses/drug therapy/genetics/*pathology MH - Thiolester Hydrolases/*genetics PMC - PMC4572073 EDAT- 2015/07/15 06:00 MHDA- 2016/07/07 06:00 PMCR- 2016/10/01 CRDT- 2015/07/11 06:00 PHST- 2015/04/09 00:00 [received] PHST- 2015/07/06 00:00 [accepted] PHST- 2015/07/11 06:00 [entrez] PHST- 2015/07/15 06:00 [pubmed] PHST- 2016/07/07 06:00 [medline] PHST- 2016/10/01 00:00 [pmc-release] AID - ddv266 [pii] AID - 10.1093/hmg/ddv266 [doi] PST - ppublish SO - Hum Mol Genet. 2015 Oct 1;24(19):5416-32. doi: 10.1093/hmg/ddv266. Epub 2015 Jul 9.