Splicing factor polymorphisms, the control of VEGF isoforms and association with angiogenic eye disease.

Abstract:

PURPOSE:Alternative splicing of the last exon (exon 8) of vascular endothelial growth factor (VEGF) pre-mRNA is a key element in the balance of pro- and anti-angiogenic VEGF isoforms in exudative age-related macular degeneration (exAMD) and proliferative diabetic retinopathy (PDR). Three splicing factors, SRp40, ASF/SF2, and SRp55 are predicted to control alternative splicing by binding to exonic splice enhancers (ESE) in VEGF exon 8. This pilot study examines whether there is an association between angiogenic eye disease and splicing factor polymorphisms, and whether there are sequence variations in the alternative splice sites of the VEGF gene. MATERIALS AND METHODS:A case:control pilot study comparing 163 individuals with angiogenic eye disease (94 exAMD and 69 PDR patients) with 95 age-matched controls. Splicing factor polymorphisms were genotyped by Restriction Fragment Length Polymorphism (RFLP) and sequencing, and the VEGF alternatively spliced region was assessed by denaturing High Performance Liquid Chromatography (dHPLC) using a transgenomic WAVE heteroduplex analyzer. RESULTS:No variations were observed in the alternatively spliced region of VEGF exon 8. ASF/SF2 polymorphisms showed no association with exAMD or PDR. For PDR, we observed a trend in SRp40 (rs6573908) where the 5136CC genotype was more frequent in controls (p = 0.0517) and a significant association of the SRp55 (rs2235611), where the 2994C allele was more common in the PDR group (p = 0.03). This remained strong, but not significant, after logistic regression for age, sex, disease type, and duration (p = 0.06). CONCLUSIONS:The lack of variation in the VEGF alternatively spliced region suggests the importance of sequence conservation in this area in maintaining the balance of pro- and anti-angiogenic VEGF isoforms. The link between PDR and the SRp55 2994 polymorphism suggests a disease-specific association between factors controlling VEGF splicing and ocular angiogenesis.

journal_name

Curr Eye Res

journal_title

Current eye research

authors

Carter JG,Cherry J,Williams K,Turner S,Bates DO,Churchill AJ

doi

10.3109/02713683.2010.548892

subject

Has Abstract

pub_date

2011-04-01 00:00:00

pages

328-35

issue

4

eissn

0271-3683

issn

1460-2202

journal_volume

36

pub_type

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