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Perrault syndrome is caused by recessive mutations in CLPP, encoding a mitochondrial ATP-dependent chambered protease.


ABSTRACT: Perrault syndrome is a genetically and clinically heterogeneous autosomal-recessive condition characterized by sensorineural hearing loss and ovarian failure. By a combination of linkage analysis, homozygosity mapping, and exome sequencing in three families, we identified mutations in CLPP as the likely cause of this phenotype. In each family, affected individuals were homozygous for a different pathogenic CLPP allele: c.433A>C (p.Thr145Pro), c.440G>C (p.Cys147Ser), or an experimentally demonstrated splice-donor-site mutation, c.270+4A>G. CLPP, a component of a mitochondrial ATP-dependent proteolytic complex, is a highly conserved endopeptidase encoded by CLPP and forms an element of the evolutionarily ancient mitochondrial unfolded-protein response (UPR(mt)) stress signaling pathway. Crystal-structure modeling suggests that both substitutions would alter the structure of the CLPP barrel chamber that captures unfolded proteins and exposes them to proteolysis. Together with the previous identification of mutations in HARS2, encoding mitochondrial histidyl-tRNA synthetase, mutations in CLPP expose dysfunction of mitochondrial protein homeostasis as a cause of Perrault syndrome.

SUBMITTER: Jenkinson EM 

PROVIDER: S-EPMC3617381 | biostudies-literature | 2013 Apr

REPOSITORIES: biostudies-literature

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Perrault syndrome is caused by recessive mutations in CLPP, encoding a mitochondrial ATP-dependent chambered protease.

Jenkinson Emma M EM   Rehman Atteeq U AU   Walsh Tom T   Clayton-Smith Jill J   Lee Kwanghyuk K   Morell Robert J RJ   Drummond Meghan C MC   Khan Shaheen N SN   Naeem Muhammad Asif MA   Rauf Bushra B   Billington Neil N   Schultz Julie M JM   Urquhart Jill E JE   Lee Ming K MK   Berry Andrew A   Hanley Neil A NA   Mehta Sarju S   Cilliers Deirdre D   Clayton Peter E PE   Kingston Helen H   Smith Miriam J MJ   Warner Thomas T TT   Black Graeme C GC   Trump Dorothy D   Davis Julian R E JR   Ahmad Wasim W   Leal Suzanne M SM   Riazuddin Sheikh S   King Mary-Claire MC   Friedman Thomas B TB   Newman William G WG  

American journal of human genetics 20130328 4


Perrault syndrome is a genetically and clinically heterogeneous autosomal-recessive condition characterized by sensorineural hearing loss and ovarian failure. By a combination of linkage analysis, homozygosity mapping, and exome sequencing in three families, we identified mutations in CLPP as the likely cause of this phenotype. In each family, affected individuals were homozygous for a different pathogenic CLPP allele: c.433A>C (p.Thr145Pro), c.440G>C (p.Cys147Ser), or an experimentally demonstr  ...[more]

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