Exome sequencing of 47 chinese families with cone-rod dystrophy: mutations in 25 known causative genes.
2013
Objective: The goal of this study was to identify mutations in 25 known causative genes in 47 unrelated Chinese
familieswith cone-rod dystrophy (CORD). Methods: Forty-seven probands from unrelated
familieswith CORD were recruited. Genomic DNA prepared from leukocytes was analyzed by whole
exome sequencing. Variants in the 25 genes were selected and then validated by
Sanger sequencing. Results: Fourteen potential pathogenic mutations, including nine novel and five known, were identified in 10 of the 47
families(21.28%). Homozygous, compound heterozygous, and hemizygous mutations were detected in three, four, or three
families, respectively. The 14 mutations in the 10
familieswere distributed among CNGB3 (three
families), PDE6C (two
families),
ABCA4(one
family), RPGRIP1 (one
family), RPGR (two
families), and CACNA1F (one
family). Conclusions: This study provides a brief view on mutation spectrum of the 25 genes in a Chinese cohort with CORD. Identification of novel mutations enriched our understanding of variations in these genes and their associated phenotypes. To our knowledge, this is the first systemic
exome-sequencing analysis of all of the 25 CORD-associated genes.
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