Haploinsufficiency of RCBTB1 is associated with Coats disease and familial exudative vitreoretinopathy.

Abstract:

:Familial exudative vitreoretinopathy (FEVR) belongs to a group of genetically and clinically heterogeneous disorders in retinal vascular development. To date, in approximately 50% of patients with FEVR, pathogenic mutations have been detected in FZD4, LRP5, TSPAN12, NDP and ZNF408. In this study, we identified two heterozygous frameshift mutations in RCBTB1 from three Taiwanese cases through exome sequencing. In patient-derived lymphoblastoid cell lines (LCLs), the protein level of RCBTB1 is approximately half that of unaffected control LCLs, which is indicative of a haploinsufficiency mechanism. By employing transient transfection and reporter assays for the transcriptional activity of β-catenin, we demonstrated that RCBTB1 participates in the Norrin/FZD4 signaling pathway and that knockdown of RCBTB1 by shRNA significantly reduced nuclear accumulation of β-catenin under Norrin and Wnt3a treatments. Furthermore, transgenic fli1:EGFP zebrafish with rcbtb1 knockdown exhibited anomalies in intersegmental and intraocular vessels. These results strongly support that reduced RCBTB1 expression may lead to defects in angiogenesis through the Norrin-dependent Wnt pathway, and that RCBTB1 is a putative genetic cause of vitreoretinopathies.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Wu JH,Liu JH,Ko YC,Wang CT,Chung YC,Chu KC,Liu TT,Chao HM,Jiang YJ,Chen SJ,Chung MY

doi

10.1093/hmg/ddw041

subject

Has Abstract

pub_date

2016-04-15 00:00:00

pages

1637-47

issue

8

eissn

0964-6906

issn

1460-2083

pii

ddw041

journal_volume

25

pub_type

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