Association between single nucleotide polymorphisms of 5'-untranslated region of GPx4 gene and male infertility / 中华医学遗传学杂志

<p><b>OBJECTIVE</b>To study the association between the single nucleotide polymorphisms (SNPs) of the 5'-untranslated region (5'-UTR) of phospholipid hydroperoxide glutathione peroxidase (GPx4 or PHGPx) gene and oligo- or asthenozoospermic male infertility.</p><p><b>METHODS</b>The 5'-UTR region of the GPx4 gene was amplified from infertile men and controls using the polymerase chain reaction and was analyzed for polymorphisms by direct sequencing.</p><p><b>RESULTS</b>A total of 9 SNPs were present in the cohort, however there were no significant differences in these 9 SNPs between the case and control groups. According to the results of linkage disequilibrium analysis and haplotype construction, one haplotype (rs757229-rs757230-rs4588110-rs3746165-rs3746166: C-G-G-T-A) was present only in the control men, and significant difference was detected(P< 0.01).</p><p><b>CONCLUSION</b>The SNPs of 5'-UTR region of the GPx4 gene might not be associated with oligo- or asthenozoospermic male infertility. However, the haplotype (rs757229-rs757230-rs4588110- rs3746165-rs3746166: C-G-G-T-A) might be a protective haplotype.</p>

Association between diversity of hypoxia at different altitude and the polymorphism of EPAS1 gene / 中华医学遗传学杂志

<p><b>OBJECTIVE</b>To study the selection effect of endothelial PAS domain protein 1 (EPAS1) gene induced by high altitude hypoxia environment.</p><p><b>METHODS</b>Fourteen single nucleotide polymorphism sites (SNPs) of the EPAS1 gene were genotyped using PCR-restriction fragment length polymorphism (PCR-RFLP) in three Tibetan groups (58 samples from Tibetan living in an altitude of about 3700 meters above sea level, 47 from Qinghai province, about 3100 meters above sea level, 43 from Yunnan province, about 2500 meters above sea level), and Han of Shandong (47 samples, about 50 meters above sea level).</p><p><b>RESULTS</b>There were significant differences of most SNP allelic, genotypic and haplotypic frequencies when comparing Han of Shandong, Tibetan of Yunnan with Tibetan of Tibetan and Qinghai. But no difference between Han of Shandong and Tibetan of Yunnan was found.</p><p><b>CONCLUSION</b>The EPAS1 gene might be under hypoxic selection induced by high altitude.</p>

Study of nine single nucleotide polymorphism loci of human HIF1A gene in three Tibetan groups / 中华医学遗传学杂志

<p><b>OBJECTIVE</b>To investigate the effect of hypoxia environment induced by altitude on hypoxia inducible factor 1α (HIF1A) gene.</p><p><b>METHODS</b>Nine single nucleotide polymorphism (SNP) loci of the HIF1A gene from three Tibetan groups (Tibet, Qinghai Province and Yunnan Province) were genotyped using PCR-restriction fragment length polymorphism (PCR-RFLP) method.</p><p><b>RESULTS</b>For non-synonymous mutation SNP site, there was no significant difference among the three Tibetan groups, except for SNP rs11549465 between Tibet Tibetan and Yunnan Tibetan, as well as between Qinghai Tibetan and Yunnan Tibetan. Frequencies of genotypes and alleles in rs4899056, rs1957757, rs10873142 and rs3783752 had significant differences between Tibet Tibetan and Yunnan Tibetan, and between Qinghai Tibetan and Yunnan Tibetan (all P<0.05). We also observed that the difference was negatively correlated with the altitude.</p><p><b>CONCLUSION</b>The results suggested that the HIF1A gene might be under hypoxic selection induced by high altitude in the three groups.</p>