Diagnostic yield of targeted gene panel sequencing to identify the genetic etiology of disorders of sex development

Publication date: Available online 24 January 2017
Source:Molecular and Cellular Endocrinology
Author(s): Ja Hye Kim, Eungu Kang, Sun Hee Heo, Gu-Hwan Kim, Ja-Hyun Jang, Eun-Hae Cho, Beom Hee Lee, Han-Wook Yoo, Jin-Ho Choi
Disorders of sex development (DSD) vary phenotypically and are caused by a number of genetic etiologies. This study investigated the genetic etiology of DSD patients using targeted exome sequencing of 67 known DSD-associated genes in humans. This study included 37 patients with 46, XY DSD and seven patients with 46, XX DSD. We identified known pathogenic mutations or deletion in nine (20.5%) patients in the AR, CYP17A1, SRD5A1, and DMRT1/2 genes. Novel variants were identified in nine patients (20.5%) in the AR, ATRX, CYP17A1, CHD7, MAP3K1, NR5A1, and WWOX genes. Among them, four patients harbored pathogenic or likely pathogenic variants, while the remaining five patients (11.4%) had variants of uncertain significance. We were able to make a genetic diagnosis in 29.5% of patients with pathogenic or likely pathogenic mutations. Targeted exome sequencing is an efficient tool to improve the diagnostic yield of DSD, despite its phenotypic and genetic heterogeneity.



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