Abstract
Hereditary hearing impairment (HI) displays extensive genetic heterogeneity. To date, 67 autosomal recessive nonsyndromic hearing impairment (ARNSHI) loci have been mapped, and 24 genes have been identified. This report describes three large consanguineous ARNSHI Pakistani families, all of which display linkage to marker loci located in the genetic interval of DFNB49 locus on chromosome 5q13. Recently, Riazuddin et al. (Am J Hum Genet 2006; 79:1040–1051) reported that variants within the TRIC gene, which encodes tricellulin, are responsible for HI due to DFNB49. TRIC gene sequencing in these three families led to the identification of a novel mutation (IVS4 + 1G > A) in one family and the discovery of a previously described mutation (IVS4 + 2T > C) in two families. It is estimated that 1.06% (95% confidence interval 0.02–3.06%) of families with ARNSHI in Pakistan manifest HI due to mutations in the TRIC gene.
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Acknowledgments
We thank the patients and other family members for participating in this study. The work presented here was funded by the Higher Education Commission (HEC), Islamabad, Pakistan, and National Institutes of Health (NIH), National Institute of Deafness and other Communication Disorders (NIDCD), Bethesda, MD, USA, grant DC03594. Muhammad Salman Chishti was supported by indigenous Ph.D. fellowships from HEC and NIDCD grant R01-DC03594. Genotyping services were provided by Center for Inherited Disease Research (CIDR) (Bethesda, MD, USA) and the National Heart, Lung and Blood Institute (NHLBI) Mammalian Genotyping Service (Marshfield, WI, USA). CIDR is fully funded through a federal contract from the NIH to The Johns Hopkins University (Baltimore, MD, USA), contract number N01-HG-65403.
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Chishti, M.S., Bhatti, A., Tamim, S. et al. Splice-site mutations in the TRIC gene underlie autosomal recessive nonsyndromic hearing impairment in Pakistani families. J Hum Genet 53, 101–105 (2008). https://doi.org/10.1007/s10038-007-0209-3
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DOI: https://doi.org/10.1007/s10038-007-0209-3
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