CPT1A and obesity due to melanocortin 4 receptor deficiency: This included protein kinase C elipson (PRKCE), known to be involved in brain tumors [44], carnitine palmitoyltransferase I (CPT1A), 11β-hydroxysteroid dehydrogenase type 1 (HSD11B1) and apolipoprotein B (APOB) which are all linked to obesity [45]–[47].