{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nAlthough the provided abstracts do not explicitly mention RN7SL2, they collectively illustrate a neuropeptide system—involving QRFP (also known as 26RFa) and its receptor GPR103—that orchestrates multiple aspects of energy balance and metabolism. In these studies, the QRFP/GPR103 peptidergic axis is predominantly examined for its central role in the regulation of feeding behavior, where QRFP/26RFa acts as a potent orexigenic (appetite‐stimulating) factor that modulates food intake and macronutrient preference in various animal models."}, {"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": "\nBeyond its hypothalamic actions, activation of GPR103 by its endogenous ligands (including QRFP-43, QRFP-26, and the high-affinity peptide P518) has been shown to promote adipogenesis while inhibiting lipolysis. This contributes to increased triglyceride accumulation, improved insulin sensitivity, and enhanced incretin effects, particularly in adipose tissue and pancreatic islets. Such peripheral actions not only underscore its influence on glucose homeostasis and lipid metabolism but also highlight its potential role in metabolic adaptation under conditions like high-fat diet–induced obesity and type 2 diabetes."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "4", "end_ref": "7"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAdditional studies extend the spectrum of QRFP/GPR103 functionality to include roles in bone mineral density maintenance and testicular cell proliferation. For example, genetic models and expression analyses reveal that QRFP influences the proliferation and differentiation of germ cells, modulates testicular energy metabolism, and may also contribute to the regulation of skeletal homeostasis. Although these reports focus on QRFP-related activities and do not address RN7SL2, the overall data emphasize a broader neuroendocrine network that integrates feeding behavior, metabolic responses, and reproductive as well as skeletal functions. These integrated pathways suggest that while RN7SL2 itself is not characterized in these abstracts, further investigation into similar noncoding RNAs may reveal additional layers of regulation in these complex processes."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "8", "end_ref": "12"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Ying Jiang, Lin Luo, Eric L Gustafson, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Identification and characterization of a novel RF-amide peptide ligand for orphan G-protein-coupled receptor SP9155."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Biol Chem (2003)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1074/jbc.M302945200"}], "href": "https://doi.org/10.1074/jbc.M302945200"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "12714592"}], "href": "https://pubmed.ncbi.nlm.nih.gov/12714592"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Nicolas Chartrel, Federica Bruzzone, Cynthia Dujardin, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Identification of 26RFa from frog brain: a novel hypothalamic neuropeptide with orexigenic activity in mammals."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Ann N Y Acad Sci (2005)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1196/annals.1327.009"}], "href": "https://doi.org/10.1196/annals.1327.009"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "15891009"}], "href": "https://pubmed.ncbi.nlm.nih.gov/15891009"}]}, {"type": "r", "ref": 3, "children": [{"type": "t", "text": "Qing Zhang, Ping Qiu, M Gladys Arreaza, et al. 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"}, {"type": "b", "children": [{"type": "t", "text": "GPR103b functions in the peripheral regulation of adipogenesis."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Mol Endocrinol (2010)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1210/me.2010-0010"}], "href": "https://doi.org/10.1210/me.2010-0010"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "20534693"}], "href": "https://pubmed.ncbi.nlm.nih.gov/20534693"}]}, {"type": "r", "ref": 5, "children": [{"type": "t", "text": "S D Primeaux, M J Barnes, H D Braymer "}, {"type": "b", "children": [{"type": "t", "text": "Hypothalamic QRFP: regulation of food intake and fat selection."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Horm Metab Res (2013)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1055/s-0033-1353181"}], "href": "https://doi.org/10.1055/s-0033-1353181"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "23979792"}], "href": "https://pubmed.ncbi.nlm.nih.gov/23979792"}]}, {"type": "r", "ref": 6, "children": [{"type": "t", "text": "Christian Jossart, Mukandila Mulumba, Riccarda Granata, et al. 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