CNOT3 is a modifier of PRPF31 mutations in retinitis pigmentosa with incomplete penetrance.

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Serval ID
serval:BIB_66416406AF60
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
CNOT3 is a modifier of PRPF31 mutations in retinitis pigmentosa with incomplete penetrance.
Journal
PLOS Genetics
Author(s)
Venturini G., Rose A.M., Shah A.Z., Bhattacharya S.S., Rivolta C.
ISSN
1553-7404 (Electronic)
ISSN-L
1553-7390
Publication state
Published
Issued date
2012
Volume
8
Number
11
Pages
e1003040
Language
english
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't Publication Status: ppublish
Abstract
Heterozygous mutations in the PRPF31 gene cause autosomal dominant retinitis pigmentosa (adRP), a hereditary disorder leading to progressive blindness. In some cases, such mutations display incomplete penetrance, implying that certain carriers develop retinal degeneration while others have no symptoms at all. Asymptomatic carriers are protected from the disease by a higher than average expression of the PRPF31 allele that is not mutated, mainly through the action of an unknown modifier gene mapping to chromosome 19q13.4. We investigated a large family with adRP segregating an 11-bp deletion in PRPF31. The analysis of cell lines derived from asymptomatic and affected individuals revealed that the expression of only one gene among a number of candidates within the 19q13.4 interval significantly correlated with that of PRPF31, both at the mRNA and protein levels, and according to an inverse relationship. This gene was CNOT3, encoding a subunit of the Ccr4-not transcription complex. In cultured cells, siRNA-mediated silencing of CNOT3 provoked an increase in PRPF31 expression, confirming a repressive nature of CNOT3 on PRPF31. Furthermore, chromatin immunoprecipitation revealed that CNOT3 directly binds to a specific PRPF31 promoter sequence, while next-generation sequencing of the CNOT3 genomic region indicated that its variable expression is associated with a common intronic SNP. In conclusion, we identify CNOT3 as the main modifier gene determining penetrance of PRPF31 mutations, via a mechanism of transcriptional repression. In asymptomatic carriers CNOT3 is expressed at low levels, allowing higher amounts of wild-type PRPF31 transcripts to be produced and preventing manifestation of retinal degeneration.
Pubmed
Web of science
Open Access
Yes
Create date
14/03/2013 18:09
Last modification date
20/08/2019 14:22
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