The insulin-like growth factors possess growth-promoting activity (By similarity). Major fetal growth hormone in mammals. Plays a key role in regulating fetoplacental development. IGF2 is influenced by placental lactogen. Also involved in tissue differentiation. In adults, involved in glucose metabolism in adipose tissue, skeletal muscle and liver (Probable). Acts as a ligand for integrin which is required for IGF2 signaling (PubMed:28873464). Positively regulates myogenic transcription factor MYOD1 function by facilitating the recruitment of transcriptional coactivators, thereby controlling muscle terminal differentiation (By similarity). Inhibits myoblast differentiation and modulates metabolism via increasing the mitochondrial respiration rate (By similarity). Preptin undergoes glucose-mediated co-secretion with insulin, and acts as physiological amplifier of glucose-mediated insulin secretion. Exhibits osteogenic properties by increasing osteoblast mitogenic activity through phosphoactivation of MAPK1 and MAPK3. Interacts with MYORG; this interaction is required for IGF2 secretion (By similarity). Interacts with integrins ITGAV:ITGB3 and ITGA6:ITGB4; integrin-binding is required for IGF2 signaling (PubMed:28873464). Expressed in heart, placenta, lung, liver, muscle, kidney, tongue, limb, eye and pancreas. During embryogenesis, detected in liver, lung, skeletal muscle and placenta. O-glycosylated with core 1 or possibly core 8 glycans. Thr-96 is a minor glycosylation site compared to Thr-99. Proteolytically processed by PCSK4, proIGF2 is cleaved at Arg-128 and Arg-92 to generate big-IGF2 and mature IGF2. Genetic variations in IGF2 are associated with body mass index (BMI). The BMI is a statistical measurement which compares a person's weight and height. The gene represented in this entry is involved in disease pathogenesis. The disease is caused by variants affecting the gene represented in this entry. The IGF2 locus is imprinted. Paternal inherited gene is expressed, while the maternal inherited gene is imprinted, hence silenced. Transcripts from 5 promoters P0, P1, P2, P3 and P4 code for the same protein but are differentially regulated in a developmental stage and tissue specificity. Product of 5 different transcripts regulated by 5 different promoters, denominated P0, P1, P2, P3 and P4. Belongs to the insulin family. Insulin-like growth factor 2 entry