Abstract
Purpose
Congenital bilateral absence of the vas deferens (CBAVD) is a major cause of obstructive azoospermia and male factor infertility. CBAVD is mainly caused by mutations in the genes encoding CFTR (cystic fibrosis transmembrane conductance regulator) and ADGRG2 (adhesion G protein-coupled receptor G2). This study aimed to describe CFTR and ADGRG2 variations in 46 Chinese CBAVD patients and evaluated sperm retrieval and assisted reproductive technology outcomes.
Methods
The CFTR and ADGRG2 genes were sequenced and analyzed by whole-exome sequencing (WES), and variations were identified by Sanger sequencing. Bioinformatic analysis was performed. We retrospectively reviewed the outcomes of patients undergoing sperm retrieval surgery and intracytoplasmic sperm injection (ICSI).
Results
In total, 35 of 46 (76.09%) patients carried at least one variation in CFTR, but no copy number variants or ADGRG2 variations were found. In addition to the IVS9-5 T allele, there were 27 CFTR variations, of which 4 variations were novel and predicted to be damaging by bioinformatics. Spermatozoa were successfully retrachieved in 46 patients, and 39 of the patients had their own offspring through ICSI.
Conclusion
There are no obvious hotspot CFTR mutations in Chinese CBAVD patients besides the IVS9-5 T allele. Therefore, WES might be the best detection method, and genetic counseling should be different from that provided to Caucasian populations. After proper counseling, all patients can undergo sperm retrieval from their epididymis or testis, and most of them can have their own children through ICSI.
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Acknowledgements
The authors are deeply grateful for the participation of all the patients in this study. We thank Li Zhang from CarrierGene Biotechnologies Co., Ltd., for analyzing data. We also thank Charlesworth Author Services (www.cwauthors.com.cn) for editing the English text of the draft of this manuscript.
Funding
Suzhou Medical and Industrial Integration Collaborative Innovation Research Project (No. SLJ201906); Suzhou Medical and Industrial Cooperation Project (a new urine collection device study for ileal cystostomy).
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Cheng, H., Yang, S., Meng, Q. et al. Genetic analysis and intracytoplasmic sperm injection outcomes of Chinese patients with congenital bilateral absence of vas deferens. J Assist Reprod Genet 39, 719–728 (2022). https://doi.org/10.1007/s10815-022-02417-z
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DOI: https://doi.org/10.1007/s10815-022-02417-z