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TOPORS, implicated in retinal degeneration, is a cilia-centrosomal protein.

Abstract：

:We recently reported that mutations in the widely expressed nuclear protein TOPORS (topoisomerase I-binding arginine/serine rich) are associated with autosomal dominant retinal degeneration. However, the precise localization and a functional role of TOPORS in the retina remain unknown. Here, we demonstrate that TOPORS is a novel component of the photoreceptor sensory cilium, which is a modified primary cilium involved with polarized trafficking of proteins. In photoreceptors, TOPORS localizes primarily to the basal bodies of connecting cilium and in the centrosomes of cultured cells. Morpholino-mediated silencing of topors in zebrafish embryos demonstrates in another species a comparable retinal problem as seen in humans, resulting in defective retinal development and failure to form outer segments. These defects can be rescued by mRNA encoding human TOPORS. Taken together, our data suggest that TOPORS may play a key role in regulating primary cilia-dependent photoreceptor development and function. Additionally, it is well known that mutations in other ciliary proteins cause retinal degeneration, which may explain why mutations in TOPORS result in the same phenotype.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Chakarova CF,Khanna H,Shah AZ,Patil SB,Sedmak T,Murga-Zamalloa CA,Papaioannou MG,Nagel-Wolfrum K,Lopez I,Munro P,Cheetham M,Koenekoop RK,Rios RM,Matter K,Wolfrum U,Swaroop A,Bhattacharya SS

doi

10.1093/hmg/ddq543

subject

Has Abstract

pub_date

2011-03-01 00:00:00

pages

975-87

issue

5

eissn

0964-6906

issn

1460-2083

pii

ddq543

journal_volume

20

pub_type

杂志文章

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