IGF2BP1 and obesity due to melanocortin 4 receptor deficiency: The detailed function of IGF2BP1 in chicken adipogenesis, the mechanism of how IGF2BP1 increased its expression in a high-fat diet-fed dw chickens, the connection between IGF2BP1 expression and GHR-mutation, and the specific pathways involved in GHR-mutation induced obesity of chicken still remain to be further explored.