CD79A and obesity due to melanocortin 4 receptor deficiency: GSEA results showed that the expression of gene sets in pancreatic secretion (P = 0.0040), fat digestion and absorption (P = 0.0152), neuroactive ligand-receptor interaction (P < 0.0001) and intestinal immune network for IgA production (P = 0.0159) was slightly higher in normal + infection group and lower in obesity + infection group.