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    Copy number variation analysis in Turkish patients with congenital bilateral absence of vas deferens
    (2021) Demir Ekşi, Durkadın; Yılmaz, Elanur; Akın, Yiğit; Usta, Mustafa Faruk; Başar, Mehmet Murad; Kahraman, Semra; Erman, Munire; Alper, Özgül M.
    Objective: Congenital Bilateral Absence of the Vas Deferens (CBAVD) is a developmental abnormality that causes infertility in males. According to the literature, up to 88% of CBAVD cases have at least one pathogenic Cystic Fibrosis Transmembrane Conductance Regulator gene (CFTR) mutation. However, based on our previous data, this rate was 15.90% in Turkish patients with CBAVD. We aimed to identify genomic copy number variations (CNV) and candidate genomic regions which could related to the CBAVD in Turkish population. Methods: CNV analysis was performed in 19 Turkish CBAVD patients normal karyotypes and a wild type CFTR genotype. We suggested that the DAD1 gene may be a candidate gene related to CBAVD by reviewing online databases and analyzing CNV findings. Sanger sequencing of the DAD1 gene exons was performed in 22 patients. Results: We identified 11 CNVs that most likely related with the disease in nine of 19 (47.3%) patients. As the most common CNV, 14q11.2 deletions were detected in there (15.79%) of the patients. There was only DAD1 gene in the sharing genomic region of two of the 14q11.2 deletions. No sequence variation was detected in the DAD1 gene of the patients. Conclusion: The 14q11.2 chromosomal region and the DAD1 gene may be associated with CBAVD. Further studies are needed to indentify the contribution of CNVs and DAD1 gene to CBAVD etiology