Loss of function of the melanocortin 2 receptor accessory protein 2 is associated with mammalian obesity.

Abstract	Melanocortin receptor accessory proteins (MRAPs) modulate signaling of melanocortin receptors in vitro. To investigate the physiological role of brain-expressed melanocortin 2 receptor accessory protein 2 (MRAP2), we characterized mice with whole-body and brain-specific targeted deletion of Mrap2, both of which develop severe obesity at a young age. Mrap2 interacts directly with melanocortin 4 receptor (Mc4r), a protein previously implicated in mammalian obesity, and it enhances Mc4r-mediated generation of the second messenger cyclic adenosine monophosphate, suggesting that alterations in Mc4r signaling may be one mechanism underlying the association between Mrap2 disruption and obesity. In a study of humans with severe, early-onset obesity, we found four rare, potentially pathogenic genetic variants in MRAP2, suggesting that the gene may also contribute to body weight regulation in humans.
Authors	Masato Asai, Shwetha Ramachandrappa, Maria Joachim, Yuan Shen, Rong Zhang, Nikhil Nuthalapati, Visali Ramanathan, David E Strochlic, Peter Ferket, Kirsten Linhart, Caroline Ho, Tatiana V Novoselova, Sumedha Garg, Martin Ridderstråle, Claude Marcus, Joel N Hirschhorn, Julia M Keogh, Stephen O'Rahilly, Li F Chan, Adrian J Clark, I Sadaf Farooqi, Joseph A Majzoub
Journal	Science (New York, N.Y.) (Science) Vol. 341 Issue 6143 Pg. 275-8 (Jul 19 2013) ISSN: 1095-9203 [Electronic] United States
PMID	23869016 (Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't)
Chemical References	Adaptor Proteins, Signal Transducing Carrier Proteins MC4R protein, mouse MRAP2 protein, human MRAP2 protein, mouse Receptor Activity-Modifying Proteins Receptor, Melanocortin, Type 4
Topics	Adaptor Proteins, Signal Transducing Adolescent Animals Body Mass Index Body Weight (genetics) Carrier Proteins (genetics) Child Child, Preschool Energy Metabolism (genetics) Female Gene Deletion Humans Male Mice Mice, Knockout Obesity (genetics, metabolism) Receptor Activity-Modifying Proteins (genetics, metabolism) Receptor, Melanocortin, Type 4 (genetics, metabolism) Young Adult

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