Exome Sequencing of 47 Chinese Families with Cone-Rod Dystrophy: Mutations in 25 Known Causative Genes |
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| Authors: | Li Huang Qingyan Zhang Shiqiang Li Liping Guan Xueshan Xiao Jianguo Zhang Xiaoyun Jia Wenmin Sun Zhihong Zhu Yang Gao Ye Yin Panfeng Wang Xiangming Guo Jun Wang Qingjiong Zhang |
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| Institution: | 1. State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, Guangdong, China.; 2. BGI-Shenzhen, Shenzhen, Guangdong, China.; Innsbruck Medical University, Austria, |
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| Abstract: | ObjectiveThe goal of this study was to identify mutations in 25 known causative genes in 47 unrelated Chinese families with cone-rod dystrophy (CORD).MethodsForty-seven probands from unrelated families with 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.ResultsFourteen 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 families were distributed among CNGB3 (three families), PDE6C (two families), ABCA4 (one family), RPGRIP1 (one family), RPGR (two families), and CACNA1F (one family).ConclusionsThis 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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