Deep Intronic Sequence Variants in COL2A1 Affect the Alternative Splicing Efficiency of Exon 2, and May Confer a Risk for Rhegmatogenous Retinal Detachment
ABSTRACT COL2A1 mutations causing haploinsufficiency of type II collagen cause type 1 Stickler syndrome that has a high risk of retinal detachment and failure of the vitreous to develop normally. Exon 2 of COL2A1 is alternatively spliced, expressed in the eye but not in mature cartilage and encodes...
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Published in | Human mutation Vol. 37; no. 10; pp. 1085 - 1096 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
United States
Blackwell Publishing Ltd
01.10.2016
Hindawi Limited |
Subjects | |
Online Access | Get full text |
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Summary: | ABSTRACT
COL2A1 mutations causing haploinsufficiency of type II collagen cause type 1 Stickler syndrome that has a high risk of retinal detachment and failure of the vitreous to develop normally. Exon 2 of COL2A1 is alternatively spliced, expressed in the eye but not in mature cartilage and encodes a region that binds growth factors TGFβ1 and BMP‐2. We investigated how both an apparently de novo variant and a polymorphism in intron 2 altered the efficiency of COL2A1 exon 2 splicing and how the latter may act as a predisposing risk factor for the occurrence of posterior vitreous detachment (PVD)‐associated rhegmatogenous retinal detachment (RRD) in the general population. Using amplification of illegitimate transcripts and allele‐specific minigenes expressed in cultured cells, we demonstrate variability in exon 2 inclusion not only between different control individuals, but also between different COL2A1 alleles. We identify transacting factors that bind to allele‐specific RNA sequences, and investigate the effect of knockdown and overexpression of these factors on exon 2 splicing efficiency. Finally, using a specific cohort of patients with PVD‐associated RRD and a control population, we demonstrate a significant difference in the frequency of the COL2A1 intronic variant rs1635532 between the two groups.
Fundus photograph of superior bullous rhegmatogenous retinal detachment. |
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Bibliography: | ArticleID:HUMU23050 ark:/67375/WNG-B9409BRM-6 University of Cambridge Retinal Research Fund; Annie Arnold Research Legacy istex:2F417B9B3A6451108C775AB1494D123851843E62 Correspondence to: Martin P Snead, Vitreoretinal Service, BOX 41, Addenbrooke's Hospital, Cambridge University NHS Foundation Trust, Hills Road, Cambridge CB2 0QQ, UK. E‐mail Communicated by Daniel F. Schorderet mps34@cam.ac.uk Contract grant sponsors: University of Cambridge Retinal Research Fund; Annie Arnold Research Legacy. ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 1059-7794 1098-1004 |
DOI: | 10.1002/humu.23050 |