SLC2A4 and gestational diabetes: In the above analysis, SLC2A4 rs5435 (Recessive model); RBP4 rs7091052 (Dominance model); PCK1 rs1042531 (Recessive model) and rs2236745 (Dominance model); and PIK3R1 rs34309 (Recessive model) were associated with GDM risk.