There was no genome-wide significant marker, but two reached the suggestive significance level: SNP rs78175392:T:C (MAF: 0.14 in GDM group, 0.07 in non-DM group) in the intronic region of SLC12A8 gene on the chromosome (Chr) 3 (RR: 2.0 [1.5–2.7], P value: 3.5e− 06) and SNP rs12253503:A:G (MAF: 0.58 in GDM group, 0.45 in non-DM group) in the intergenic region of RP11-186O14.7 gene on Chr10 (RR: 1.6 [1.3–2.0], P value: 9.0e− 06) (Fig. 2, Additional file 1: Table S3). Here, SLC12A8 is linked to gestational diabetes.