Back to Search
Start Over
Homozygosity mapping in autosomal recessive retinitis pigmentosa families detects novel mutations.
- Source :
-
Molecular vision [Mol Vis] 2013 Dec 08; Vol. 19, pp. 2487-500. Date of Electronic Publication: 2013 Dec 08 (Print Publication: 2013). - Publication Year :
- 2013
-
Abstract
- Purpose: Autosomal recessive retinitis pigmentosa (arRP) is a genetically heterogeneous disease resulting in progressive loss of photoreceptors that leads to blindness. To date, 36 genes are known to cause arRP, rendering the molecular diagnosis a challenge. The aim of this study was to use homozygosity mapping to identify the causative mutation in a series of inbred families with arRP.<br />Methods: arRP patients underwent standard ophthalmic examination, Goldman perimetry, fundus examination, retinal OCT, autofluorescence measurement, and full-field electroretinogram. Fifteen consanguineous families with arRP excluded for USH2A and EYS were genotyped on 250 K SNP arrays. Homozygous regions were listed, and known genes within these regions were PCR sequenced. Familial segregation and mutation analyzes were performed.<br />Results: We found ten mutations, seven of which were novel mutations in eight known genes, including RP1, IMPG2, NR2E3, PDE6A, PDE6B, RLBP1, CNGB1, and C2ORF71, in ten out of 15 families. The patients carrying RP1, C2ORF71, and IMPG2 mutations presented with severe RP, while those with PDE6A, PDE6B, and CNGB1 mutations were less severely affected. The five families without mutations in known genes could be a source of identification of novel genes.<br />Conclusions: Homozygosity mapping combined with systematic screening of known genes results in a positive molecular diagnosis in 66.7% of families.
- Subjects :
- Adolescent
Adult
Consanguinity
Exons
Female
Genotyping Techniques
Humans
Introns
Male
Middle Aged
Pedigree
Retinitis Pigmentosa diagnosis
Retinitis Pigmentosa pathology
Sequence Analysis, DNA
Severity of Illness Index
Eye Proteins genetics
Genes, Recessive
Homozygote
Mutation
Polymorphism, Genetic
Retinitis Pigmentosa genetics
Subjects
Details
- Language :
- English
- ISSN :
- 1090-0535
- Volume :
- 19
- Database :
- MEDLINE
- Journal :
- Molecular vision
- Publication Type :
- Academic Journal
- Accession number :
- 24339724