{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nAlthough the query requested a summary of TMEM265, none of the provided abstracts discuss TMEM265. Instead, these studies focus on the PORCN gene, an X‐linked gene encoding a membrane-bound O‑acyltransferase that is essential for the post-translational lipid modification (acylation) of all Wnt ligands. PORCN-mediated acylation is critical for Wnt secretion, which in turn governs key processes in embryogenesis, tissue homeostasis, and stem cell maintenance. Consistent findings across genetic and biochemical studies underscore that PORCN’s activity establishes a regulatory bottleneck for Wnt signaling, with perturbations in its function leading to severe developmental defects such as those observed in focal dermal hypoplasia (FDH) and embryonic lethality in males."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "5"}]}, {"type": "t", "text": ""}, {"type": "p", "children": [{"type": "t", "text": "\nDetailed biochemical and cell-based assays described in these abstracts reveal that PORCN’s enzymatic activity is exquisitely regulated. Its ability to catalyze the attachment of fatty acids (notably palmitoleate) onto conserved serine residues in Wnt proteins is not only essential for enabling Wnt protein transport and secretion but also for modulating the overall strength of Wnt signaling gradients. Structural studies and mutational analyses have identified key active site residues and demonstrated that even subtle alterations in PORCN function can result in dramatic phenotypic effects in vivo. Moreover, these studies have validated PORCN as a promising target for small-molecule inhibitors, with potential therapeutic benefits in conditions such as Wnt-driven cancers and fibrotic diseases."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "6", "end_ref": "10"}]}, {"type": "t", "text": ""}, {"type": "p", "children": [{"type": "t", "text": "\nIn addition to its central role in early development, PORCN has been shown to influence tissue-specific processes later in life. Conditional and tissue-specific PORCN knockout models have demonstrated its requirement in the regulation of diverse biological processes such as kidney fibrogenesis, synaptic transmission in the hippocampus, and endometrial gland formation in the female reproductive tract. These investigations reveal that aberrant Wnt secretion, due to PORCN dysfunction, not only hampers proper morphogenesis but also impacts organ repair and function. Collectively, the data from these studies position PORCN as an essential regulatory node for Wnt pathway activity across a wide spectrum of developmental and pathophysiological contexts."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "11", "end_ref": "17"}]}, {"type": "t", "text": ""}]}]}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Steffen Biechele, Brian J Cox, Janet Rossant "}, {"type": "b", "children": [{"type": "t", "text": "Porcupine homolog is required for canonical Wnt signaling and gastrulation in mouse embryos."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Dev Biol (2011)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1016/j.ydbio.2011.04.029"}], "href": "https://doi.org/10.1016/j.ydbio.2011.04.029"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "21554866"}], "href": "https://pubmed.ncbi.nlm.nih.gov/21554866"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Jared J Barrott, Gabriela M Cash, Aaron P Smith, et al. 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"}, {"type": "b", "children": [{"type": "t", "text": "Deletion of Porcn in mice leads to multiple developmental defects and models human focal dermal hypoplasia (Goltz syndrome)."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "PLoS One (2012)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1371/journal.pone.0032331"}], "href": "https://doi.org/10.1371/journal.pone.0032331"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "22412863"}], "href": "https://pubmed.ncbi.nlm.nih.gov/22412863"}]}, {"type": "r", "ref": 4, "children": [{"type": "t", "text": "Steffen Biechele, Katie Cockburn, Fredrik Lanner, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Porcn-dependent Wnt signaling is not required prior to mouse gastrulation."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Development (2013)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1242/dev.094458"}], "href": "https://doi.org/10.1242/dev.094458"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "23760955"}], "href": "https://pubmed.ncbi.nlm.nih.gov/23760955"}]}, {"type": "r", "ref": 5, "children": [{"type": "t", "text": "Steffen Biechele, Hibret A Adissu, Brian J Cox, et al. 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