期刊
MOLECULAR GENETICS AND METABOLISM
卷 100, 期 4, 页码 349-356出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ymgme.2010.04.009
关键词
INCL; Palmitoyl protein thioesterase; Canine model; Neurodegeneration; Lysosomal storage disease
资金
- American Kennel Club Canine Health Foundation [732, 762]
- Batten Disease Support and Research Association
- Research to Prevent Blindness, Inc.
- NIH [R37NS036867]
The neuronal ceroid lipofuscinoses (NCLs) are lysosomal storage diseases characterized by progressive neurodegeneration and accumulation of autofluorescent storage granules. A 9-month-old Miniature Dachshund presented with NCL-like signs that included disorientation, ataxia, weakness, visual impairment, and behavioral changes. Neurons throughout the CNS contained autofluorescent lysosomal inclusions with granular osmiophilic deposit (GROD) ultrastructure characteristic of classical infantile NCL (INCL). Human INCL is an autosomal recessive disorder that results from mutations in PPT1, a gene that encodes the enzyme palmitoyl protein thioesterase 1 (PPT1; EC 3.1.22). Resequencing of PPT1 from the affected dog revealed that the dog was homozygous for a single nucleotide insertion in exon 8 (PPT1 c.736_737insC), upstream from the His289 active site. Brain tissue from this dog lacked PPT1 activity. The sire and dam of the propositus were heterozygous for the c.736_737insC mutation; whereas, 127 unrelated Dachshunds were homozygous for the wild-type allele. This is the first reported instance of canine NCL caused by a mutation in PPT1. (C) 2010 Elsevier Inc. All rights reserved.
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