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α- and β-melanocyte-stimulating hormones (MSH) are derived from pro-opiomelanocortin (POMC) and are the natural agonist ligands of the melanocortin 4 receptor, a key regulator of energy homeostasis. Recent rodent and human data have implicated the MAGEL2 gene, which may regulate activation of POMC neurons, as a significant contributor to the metabolic symptoms observed in Prader-Willi Syndrome (PWS). Firstly, patients with protein truncating mutations in MAGEL2 exhibit numerous clinical characteristics of PWS. Secondly, Magel2-null mice may not normally activate MC4 receptors, as they are defective in the activation of their POMC neurons and hence may fail to normally release the POMC-derived MC4 receptor agonist ligands α- and β-MSH. Magel2-null mice represent a tractable animal model for the metabolic and appetitive imbalance seen in patients with PWS.
Pubmed ID: 27339818 RIS Download
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