{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nAlthough our original query mentioned “TSSK4”, none of the provided abstracts discuss that gene. Instead, the literature converges on myostatin (growth differentiation factor‐8, GDF8)—a highly conserved member of the transforming growth factor‐β superfamily—as a master negative regulator of skeletal muscle growth. At the cellular level, myostatin impairs myogenesis by inhibiting myoblast proliferation and differentiation and by promoting the maintenance of satellite cell quiescence. Detailed mechanistic studies have shown that myostatin activates intracellular signaling cascades (including Smad2/3 and, in some contexts, p38 MAPK) that downregulate key myogenic factors such as MyoD, myogenin, and cyclin‐dependent regulators, thereby shifting the balance from progenitor expansion toward terminal differentiation."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "8"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn vivo models have demonstrated that loss‐of‐function mutations or pharmacologic inhibition of myostatin lead to dramatic increases in skeletal muscle mass, improved muscle regeneration, and resistance to muscle‐wasting conditions. For example, circulating latent myostatin becomes activated under certain conditions to promote muscle and fat loss, while targeted blockade (using antibodies, propeptide overexpression, or gene deletion) improves muscle strength and attenuates dystrophic and atrophic phenotypes. Furthermore, studies have shown that myostatin influences muscle fiber composition and is involved in mediating responses to catabolic stimuli (such as glucocorticoids), with its absence favoring hypertrophy and enhanced regeneration."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "9", "end_ref": "26"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its direct actions in muscle tissue, myostatin exerts broader systemic effects that impact metabolism, adipogenesis, and inter‐tissue communication. Its inhibition not only promotes a shift toward a lean, hypertrophied phenotype but also improves insulin sensitivity, modulates fat cell differentiation (including the browning of white adipose tissue via myokine mediators such as irisin), and influences bone and tendon homeostasis. These extra‐muscular roles highlight myostatin’s potential as a therapeutic target in treating obesity, diabetes, chronic kidney disease–associated cachexia, and even certain arthropathies where muscle–bone crosstalk is disrupted."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "27", "end_ref": "44"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Ji Lin, Heather B Arnold, Mary Anne Della-Fera, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Myostatin knockout in mice increases myogenesis and decreases adipogenesis."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Biochem Biophys Res Commun (2002)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1006/bbrc.2002.6500"}], "href": "https://doi.org/10.1006/bbrc.2002.6500"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "11855847"}], "href": "https://pubmed.ncbi.nlm.nih.gov/11855847"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Alexandra C McPherron, Se-Jin Lee "}, {"type": "b", "children": [{"type": "t", "text": "Suppression of body fat accumulation in myostatin-deficient mice."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Clin Invest (2002)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1172/JCI13562"}], "href": "https://doi.org/10.1172/JCI13562"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "11877467"}], "href": "https://pubmed.ncbi.nlm.nih.gov/11877467"}]}, {"type": "r", "ref": 3, "children": [{"type": "t", "text": "Ramón Ríos, Isabel Carneiro, Víctor M Arce, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Myostatin is an inhibitor of myogenic differentiation."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Am J Physiol Cell Physiol (2002)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1152/ajpcell.00372.2001"}], "href": "https://doi.org/10.1152/ajpcell.00372.2001"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "11940514"}], "href": "https://pubmed.ncbi.nlm.nih.gov/11940514"}]}, {"type": "r", "ref": 4, "children": [{"type": "t", "text": "Brett Langley, Mark Thomas, Amy Bishop, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Myostatin inhibits myoblast differentiation by down-regulating MyoD expression."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Biol Chem (2002)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1074/jbc.M204291200"}], "href": "https://doi.org/10.1074/jbc.M204291200"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "12244043"}], "href": "https://pubmed.ncbi.nlm.nih.gov/12244043"}]}, {"type": "r", "ref": 5, "children": [{"type": "t", "text": "Dominique Joulia, Henri Bernardi, Véronique Garandel, et al. 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"}, {"type": "b", "children": [{"type": "t", "text": "Myostatin, activin receptor IIb, and follistatin-like-3 gene expression are altered in adipose tissue and skeletal muscle of obese mice."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Am J Physiol Endocrinol Metab (2008)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1152/ajpendo.00798.2007"}], "href": "https://doi.org/10.1152/ajpendo.00798.2007"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "18334608"}], "href": "https://pubmed.ncbi.nlm.nih.gov/18334608"}]}, {"type": "r", "ref": 22, "children": [{"type": "t", "text": "Zhao Bo Li, Helen D Kollias, Kathryn R Wagner "}, {"type": "b", "children": [{"type": "t", "text": "Myostatin directly regulates skeletal muscle fibrosis."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Biol Chem (2008)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1074/jbc.M802585200"}], "href": "https://doi.org/10.1074/jbc.M802585200"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "18453534"}], "href": "https://pubmed.ncbi.nlm.nih.gov/18453534"}]}, {"type": "r", "ref": 23, "children": [{"type": "t", "text": "Alex Hennebry, Carole Berry, Victoria Siriett, et al. 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"}, {"type": "b", "children": [{"type": "t", "text": "Follistatin induces muscle hypertrophy through satellite cell proliferation and inhibition of both myostatin and activin."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Am J Physiol Endocrinol Metab (2009)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1152/ajpendo.00193.2009"}], "href": "https://doi.org/10.1152/ajpendo.00193.2009"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "19435857"}], "href": "https://pubmed.ncbi.nlm.nih.gov/19435857"}]}, {"type": "r", "ref": 26, "children": [{"type": "t", "text": "Michael R Morissette, Stuart A Cook, Cattleya Buranasombati, et al. 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