{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n COPG2, which encodes the γ2 subunit of the coatomer protein complex (COPI), plays multiple roles in vesicular trafficking and intracellular transport. Studies in mice originally demonstrated that Copg2 is subject to paternal imprinting and is embedded within an imprinted domain linked to growth‐regulatory genes, suggesting a developmentally important role for the gene."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": " Functional investigations have shown that COPG2 is a core component of COPI–coated vesicles, as it localizes predominantly to Golgi membranes and participates in the assembly of distinct coatomer complexes. In particular, COPG2 directly interacts with scaffolding proteins such as Scy1‐like protein 1 to bridge class II Arf GTPases with specific COPI subcomplexes, thereby influencing vesicle formation and Golgi architecture"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": ";."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n In humans, however, COPG2 escapes imprinting and is expressed from both alleles, in contrast to its pattern in mice. Detailed analyses in candidate imprinted regions at 7q32 revealed biallelic expression of COPG2, even though nearby genes display parent‐of‐origin–specific expression"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": ";."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": " Notably, developmental studies have uncovered human‐specific downregulation of COPG2 in the cortex compared with nonhuman primates, implicating it in the evolution of a “social brain” and raising interest in its potential contribution to neurodevelopmental conditions."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n Beyond development, COPG2 has emerged as a multifunctional player in disease. In prostate cancer cells, proteomic profiling identified COPG2 as part of a network of interacting proteins co‐localized with vesicle components, suggesting that altered COPG2 function may affect vesicular trafficking pathways in oncogenesis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "7"}]}, {"type": "t", "text": " In hematological malignancies, increased COPG2 expression has been observed in patients with cytogenetically abnormal acute myeloid leukemia, while in certain lymphomas the genomic region spanning COPG2 is frequently affected, implying that dysregulation of COPG2 may contribute to tumor cell survival"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "8"}]}, {"type": "t", "text": ";."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "9"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n In the nervous system, analyses of neuronal differentiation have distinguished the roles of coatomer subunits, with differential expression patterns observed between the paralogs; although the γ1‐COP subunit appears essential for neurite outgrowth, the precise contribution of γ2‐COP (COPG2) remains to be fully delineated."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "10"}]}, {"type": "t", "text": " Furthermore, recent genome‐wide association studies have linked COPG2 variants to alterations in the amyloid‐β42/40 ratio, pointing to a possible involvement in Alzheimer’s disease pathology."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "11"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n Species‐specific differences further highlight the complexity of COPG2 regulation. In contrast to the imprinting observed in mice, interspecific hybrid studies and investigations in cattle have consistently shown that COPG2 is biallelically expressed, emphasizing that epigenetic regulation of COPG2 is not universally conserved in mammals"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "12"}]}, {"type": "t", "text": ";"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "13"}]}, {"type": "t", "text": ";."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "14"}]}, {"type": "t", "text": " Moreover, alternative splicing events of COPG2 have been identified in cattle under pathogenic conditions, suggesting modulation of its function in immune response and stress."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "15"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n In summary, COPG2 is a multifunctional gene central to COPI‐mediated vesicular trafficking. Its interactions help orchestrate the formation and specificity of vesicle coats, while species‐ and tissue–specific patterns of expression and splicing regulation indicate additional roles in neurodevelopment and disease. These diverse functions underline the importance of COPG2 in both normal cellular physiology and pathology.\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Y J Lee, C W Park, Y Hahn, et al. 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