As shown in Table 6, when constructing haplotypes for 7 SNP loci within HLA-DQA1 and HLA -DQB1 for the GDM group and the control group, we found that the haplotype TTAAGCG was the most common, with frequencies of 35.5% in the GDM group and 33.2% in the control group. The gene discussed is HLA-DQA1; the disease is gestational diabetes.