{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n AIG1, originally identified as an AvrRpt2‐induced gene, represents a multifunctional protein family whose roles span diverse biological systems. In mammals, one study demonstrated that AIG1 functions as an atypical transmembrane threonine hydrolase capable of specifically hydrolyzing bioactive fatty acid esters of hydroxy fatty acids (FAHFAs), thereby implicating it in the regulation of bioactive lipid metabolism."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": " In parallel, analyses in human cancers have revealed alterations involving AIG1. For example, a NFIB–AIG1 fusion was identified in a subset of adenoid cystic carcinomas, and reduced AIG1 expression was correlated with poorer patient survival in hepatocellular carcinoma, suggesting that dysregulation of AIG1 may contribute to tumorigenesis and serve as a potential prognostic biomarker."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n In the parasite "}, {"type": "i", "children": [{"type": "t", "text": "Entamoeba histolytica"}]}, {"type": "t", "text": ", functional studies have shown that silencing of a gene encoding an AIG1 protein increased liver pathology in a normally nonpathogenic clone, implying a role for AIG1 in modulating virulence and protecting against excessive tissue damage."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": " Moreover, expansion of AIG1 family genes in the subterrestrial nematode "}, {"type": "i", "children": [{"type": "t", "text": "Halicephalobus mephisto"}]}, {"type": "t", "text": " and in several bivalves suggest that these proteins may act as part of a general cellular adaptation mechanism to thermal and various environmental stresses, possibly by complementing chaperone functions such as those provided by Hsp70 in the inhibition of apoptosis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n Similar themes emerge from studies in other organisms. In an analysis of the "}, {"type": "i", "children": [{"type": "t", "text": "Entamoeba nuttalli"}]}, {"type": "t", "text": " genome, diversification of transmembrane proteins including members of the AIG1 family pointed toward roles in host–parasite interactions."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": " In avian species, characterization of the GTPase immune‐associated protein 5 (Gimap5) revealed that its N‐terminal AIG1 domain may be critical for proper cell localization and function in developmental and inflammatory responses."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "7"}]}, {"type": "t", "text": " At an even deeper evolutionary level, investigations in cnidarians have shown that proteins harboring the highly conserved AIG1 domain—classified as part of the GIMAP family—participate in immune regulation, apoptosis, and autophagy."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "8"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n Intriguingly, AIG1-like domains have also been detected in the polyprotein architecture of duck hepatitis viruses, where several 2A proteins exhibit AIG1 or AIG1-like sequences; although the precise function of these domains in viral polyprotein processing remains to be elucidated, their recurrent presence underscores their evolutionary conservation."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "9", "end_ref": "11"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n Finally, in plant systems such as grapevine, the stable expression of an AIG1 ortholog has been validated and successfully employed as a reference gene in quantitative gene expression analyses."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "12"}]}, {"type": "t", "text": " Collectively, these observations illustrate that AIG1 proteins perform multifaceted roles—from regulating lipid metabolism and mediating stress responses to influencing immune function and modulating tumor behavior—underscoring their importance as conserved molecular effectors across a broad spectrum of organisms.\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "William H Parsons, Matthew J Kolar, Siddhesh S Kamat, et al. 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