Articles written in Journal of Genetics
Volume 94 Issue 4 December 2015 pp 677-687 Research Article
Sex chromosome-related anomalies engender plethora of conditions leading to male infertility. Hypogonadotropic hypogonadism (HH) is a rare but well-known cause of male infertility. Present study was conducted to ascertain possible consensus on the alterations of the Y-linked genes and loci in males representing hypogonadism (H), which in turn culminate in reproductive dysfunction. A total of nineteen 46, XY males, clinically diagnosed with H (11 representative HH adults and eight prepubertal boys suspected of having HH) were included in the study. Sequence-tagged site screening, 𝑆𝑅𝑌 gene sequencing, fluorescence in situ hybridization mapping (FISH), copy number and relative expression studies by real-time PCR were conducted to uncover the altered status of the Y chromosome in the patients. The result showed random microdeletions within the 𝐴𝑍𝐹𝑎 (73%)/𝑏 (78%) and 𝑐(26%) regions. Sequencing of the 𝑆𝑅𝑌 gene showed nucleotide variations within and outside of the HMG box in four males (21%). FISH uncovered mosaicism for 𝑆𝑅𝑌, 𝐴𝑀𝐸𝐿𝑌, 𝐷𝐴𝑍 genes and DYZ1 arrays, structural rearrangement for 𝐴𝑀𝐸𝐿𝑌 (31%) and duplication of 𝐷𝐴𝑍 (57%) genes. Copy number variation for seven Y-linked genes (2–8 rounds of duplication), DYZ1 arrays (495–6201copies) and differential expression of 𝑆𝑅𝑌, 𝑈𝑇𝑌 and 𝑉𝐶𝑌 in the patients’ blood were observed. Present work demonstrates the organizational vulnerability of several Y-linked genes in H males. These results are envisaged to be useful during routine diagnosis of H patients.
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