期刊
EUROPEAN JOURNAL OF HUMAN GENETICS
卷 21, 期 3, 页码 274-280出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/ejhg.2012.172
关键词
retinal degeneration; molecular diagnostics; next-generation sequencing
资金
- Oxford Partnership Comprehensive Biomedical Research Centre
- Department of Health's NIHR Biomedical Research Centre Programme
- Roche Diagnostics
- Ataxia UK
- Wellcome Trust [075491/Z/04]
- Biotechnology and Biological Sciences Research Council (BBSRC)
Inherited retinal degeneration (IRD) is a common cause of visual impairment (prevalence similar to 1/3500). There is considerable phenotype and genotype heterogeneity, making a specific diagnosis very difficult without molecular testing. We investigated targeted capture combined with next-generation sequencing using Nimblegen 12plex arrays and the Roche 454 sequencing platform to explore its potential for clinical diagnostics in two common types of IRD, retinitis pigmentosa and cone-rod dystrophy. 50 patients (36 unknowns and 14 positive controls) were screened, and pathogenic mutations were identified in 25% of patients in the unknown, with 53% in the early-onset cases. All patients with new mutations detected had an age of onset <21 years and 44% had a family history. Thirty-one percent of mutations detected were novel. A de nova mutation in rhodopsin was identified in one early-onset case without a family history. Bioinformatic pipelines were developed to identify likely pathogenic mutations and stringent criteria were used for assignment of pathogenicity. Analysis of sequencing metrics revealed significant variability in capture efficiency and depth of coverage. We conclude that targeted capture and next-generation sequencing are likely to be very useful in a diagnostic setting, but patients with earlier onset of disease are more likely to benefit from using this strategy. The mutation-detection rate suggests that many patients are likely to have mutations in novel genes. European Journal of Human Genetics (2013) 21, 274-280; doi:10.1038/ejhg.2012.172; published online 12 September 2012
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