Hui Zhu1, Haijun Yao2, Yue Xu1, Yan Chen3, Bing Han1, Nan Wang1, Hao Wang1, Qiang Zhang1, Wenjiao Zhu1, Yuanping Shi1, Hua Sun3, Shuangxia Zhao4, Huaidong Song4, Yang Liu5, Jie Qiao6. 1. Department of Endocrinology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200011, China. 2. Department of Urology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200011, China. 3. Department of Obstetrics and Gynecology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200011, China. 4. Research Centre for Clinical Medicine, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200011, China. 5. Department of Plastic Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200011, China. drliuyang9@163.com. 6. Department of Endocrinology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200011, China. qiaoj2001@126.com.
Abstract
BACKGROUND: Androgen insensitive syndrome (AIS) is a rare genetic disease resulting from androgen receptor (AR) mutations and one of the causes of 46, XY disorder of sexual development (DSD). This study aimed to describe the clinical features and molecular defects of 36 Chinese patients with AR variants and investigate the functional alterations of novel variants in vitro. MATERIAL AND METHODS: Subjects with AR variants were identified from 150 Chinese 46, XY DSD patients using targeted next-generation sequencing. In-silico and functional assays were performed to evaluate the transcriptional activity and nuclear localization of novel AR variants. RESULTS: Eight novel and fifteen reported AR variants were identified. 30.6% (11/36) of patients harbored additional variants other than AR. Mutations in the Arg841 residue were found in 7 unrelated patients. Postpubertal serum gonadotropin levels were significantly elevated in patients with complete AIS (CAIS) compared with those in patients with partial AIS (PAIS) (P < 0.05). All the novel variants initially predicted to be uncertain significance by in-silico analyses were reclassified as likely pathogenic for defective AR transcriptional activity in vitro, except p.L295P, which was found in an atypical patient with oligogenic mutations and reclassified as likely benign. c.368_369 ins T was observed to interfere with nuclear translocation. CONCLUSIONS: Compared with PAIS patients, postpubertal CAIS patients had higher gonadotropin levels. Arg841 was disclosed as the location of recurrent mutations in Chinese AIS patients. Functional assays are important for reclassifying the novel AR variants and re-examining the diagnosis of AIS in specific patients with oligogenic mutations, instead of in-silico analysis.
BACKGROUND: Androgen insensitive syndrome (AIS) is a rare genetic disease resulting from androgen receptor (AR) mutations and one of the causes of 46, XY disorder of sexual development (DSD). This study aimed to describe the clinical features and molecular defects of 36 Chinese patients with AR variants and investigate the functional alterations of novel variants in vitro. MATERIAL AND METHODS: Subjects with AR variants were identified from 150 Chinese 46, XY DSD patients using targeted next-generation sequencing. In-silico and functional assays were performed to evaluate the transcriptional activity and nuclear localization of novel AR variants. RESULTS: Eight novel and fifteen reported AR variants were identified. 30.6% (11/36) of patients harbored additional variants other than AR. Mutations in the Arg841 residue were found in 7 unrelated patients. Postpubertal serum gonadotropin levels were significantly elevated in patients with complete AIS (CAIS) compared with those in patients with partial AIS (PAIS) (P < 0.05). All the novel variants initially predicted to be uncertain significance by in-silico analyses were reclassified as likely pathogenic for defective AR transcriptional activity in vitro, except p.L295P, which was found in an atypical patient with oligogenic mutations and reclassified as likely benign. c.368_369 ins T was observed to interfere with nuclear translocation. CONCLUSIONS: Compared with PAIS patients, postpubertal CAIS patients had higher gonadotropin levels. Arg841 was disclosed as the location of recurrent mutations in Chinese AIS patients. Functional assays are important for reclassifying the novel AR variants and re-examining the diagnosis of AIS in specific patients with oligogenic mutations, instead of in-silico analysis.
Entities:
Keywords:
Androgen insensitive syndrome (AIS); Androgen receptor (AR) mutation; Disorder/differences of sex development (DSD); Functional assay
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