SERPINF1 and obesity due to melanocortin 4 receptor deficiency: Two molecules, C1q/tumor necrosis factor-related protein-3 (CTRP-3) and pigment epithelium-derived factor (PEDF), may possibly participate in GDM development due to the fact that underlying mechanisms of GDM are, in general, similar to the mechanisms responsible for metabolic disorders such as type 2 diabetes mellitus or obesity.