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Abstract #11236 Published in IGR 6-3
Mutations of VMD2 splicing regulators cause nanophthalmos and autosomal dominant vitreoretinochoroidopathy (ADVIRC)
Yardley J; Leroy BP; Hart-Holden N; Lafaut BA; Loeys B; Messiaen LM; Perveen R; Reddy MA; Bhattacharya SS; Traboulsi EInvestigative Ophthalmology and Visual Science 2004; 45: 3683-3689
PURPOSE: To investigate the genetic basis of autosomal dominant vitreoretinochoroidopathy (ADVIRC), a rare, inherited retinal dystrophy that may be associated with defects of ocular development, including nanophthalmos. METHODS: A combination of linkage analysis and DNA sequencing in five families was used to identify disease-causing mutations in VMD2. The effect of these mutations on splicing was assessed using a minigene system. RESULTS: Three pathogenic sequence alterations in VMD2 were identified in five families with nanophthalmos associated with ADVIRC. All sequences showed simultaneous missense substitutions and exon skipping. CONCLUSIONS: VMD2 encodes bestrophin, a transmembrane protein located at the basolateral membrane of the RPE, that is also mutated in Best macular dystrophy. We support that each heterozygous affected individual produces three bestrophin isoforms consisting of the wild type and two abnormal forms: one containing a missense substitution and the other an in-frame deletion. The data showed that VMD2 mutations caused defects of ocular patterning, supporting the hypothesized role for the RPE, and specifically VMD2, in the normal growth and development of the eye.
Dr. J. Yardley, Academic Unit of Medical Genetics and Regional Genetics Service, St. Mary's Hospital, Manchester, United Kingdom
Classification:
3.4.1 Linkage studies (Part of: 3 Laboratory methods > 3.4 Molecular genetics)
9.1.4 Other (Part of: 9 Clinical forms of glaucomas > 9.1 Developmental glaucomas)
9.3.10 Other (Part of: 9 Clinical forms of glaucomas > 9.3 Primary angle closure glaucomas)
