Citation
- Authors: Wang, H., Wang, X., He, C., Li, H., Qing, J., Grati, M., Hu, Z., Li, J., Hu, Y., Xia, K., Mei, L., Yu, J., Chen, H., Jiang, L., Liu, Y., Men, M., Zhang, H., Guan, L., Xiao, J., Zhang, J., Liu, X., Feng, Y.
- Year: 2015
- Journal: J Hum Genet 60 119-26
- Applications: in vitro / DNA / jetPRIME
- Cell type: COS-7
Description: African green monkey kidney cells
Known as: COS, COS7
Abstract
Autosomal dominant nonsyndromic hearing loss (ADNSHL/DFNA) is a highly genetically heterogeneous disorder. Hitherto only about 30 ADNSHL-causing genes have been identified and many unknown genes remain to be discovered. In this research, genome-wide linkage analysis mapped the disease locus to a 4.3 Mb region on chromosome 19q13 in SY-026, a five-generation nonconsanguineous Chinese family affected by late-onset and progressive ADNSHL. This linkage region showed partial overlap with the previously reported DFNA4. Simultaneously, probands were analyzed using exome capture followed by next-generation sequencing. Encouragingly, a heterozygous missense mutation, c.505G>A (p.G169R) in exon 3 of the CEACAM16 gene (carcinoembryonic antigen-related cell adhesion molecule 16), was identified via this combined strategy. Sanger sequencing verified that the mutation co-segregated with hearing loss in the family and that it was not present in 200 unrelated control subjects with matched ancestry. This is the second report in the literature of a family with ADNSHL caused by CEACAM16 mutation. Immunofluorescence staining and western blots also prove CEACAM16 to be a secreted protein. Furthermore, our studies in transfected HEK293T cells show that the secretion efficacy of the mutant CEACAM16 is much lower than that of the wild type, suggesting a deleterious effect of the sequence variant.