{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nMelanin-concentrating hormone receptor 2 (MCHR2) is a G protein‑coupled receptor activated by melanin‑concentrating hormone (MCH), a neuropeptide key to regulating feeding behavior and energy homeostasis. Structure–activity studies have identified an “active core” of MCH necessary to activate both MCHR1 and MCHR2, while molecular dynamics simulations have revealed that activation of MCHR2 is accompanied by spatial rearrangements near highly conserved motifs (e.g., E/DRY and NPxxY) that facilitate conformational changes and downstream signaling such as calcium mobilization."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "3"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nGenetic association studies have implicated MCHR2 in the modulation of psychiatric and metabolic phenotypes. Polymorphisms and complex genotypes involving MCHR2 have been linked to increased risks for conditions such as schizophrenia and bipolar disorder, while copy number variants in its genomic region (6q16.3) associate with alterations in body mass index and atypical depressive features. In vitro investigations, including the establishment of CHO cell lines overexpressing MCHR2, have confirmed its receptor binding characteristics and demonstrated its role in promoting preadipocyte differentiation through upregulation of adipogenic markers. Moreover, potent and selective MCHR2 antagonists have been developed as pharmacological tools to further elucidate its in vivo function."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "4", "end_ref": "9"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAdditional studies have linked MCHR2 to pigmentation processes; for instance, duplications encompassing MCHR2 have been associated with alopecia areata, potentially via a mechanism analogous to its role in pigment aggregation observed in other species, while investigations in patients with Prader–Willi–like phenotypes have examined its contribution to obesity and feeding behavior. Together, these diverse lines of evidence underscore a multifaceted role for MCHR2 in mediating neuroendocrine signals that integrate energy balance, adipogenesis, psychiatric risk, and even pigmentation physiology."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "10"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "M A Bednarek, S D Feighner, D L Hreniuk, et al. 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