| Claim/Topic | Key finding | Evidence type (review/primary/thesis/database) | System/assay | Quantitative/statistical details | Citation ID |
|---|---|---|---|---|---|
| COPG2 identity as gamma2-COP paralog | COPG2 encodes gamma2-COP, a mammalian paralog of COPG1/gamma1-COP within COPI biology; paralogs are partially redundant rather than fully equivalent. | Thesis; primary synthesis | Mouse P19/pluripotent neuronal differentiation literature review and KO analysis | Overall amino-acid identity about 80%; mouse trunk domain about 81% identical and appendage about 75% identical; gamma2-COP has a 30-aa N-terminal extension versus gamma1-COP. | (pqac-00000007, pqac-00000008) |
| COPI trafficking role and recruitment by ARF1/GBF1 | COPG2 is discussed as a COPI coatomer component or paralog in the ER-Golgi interface pathway; COPI mediates Golgi-to-ER retrograde and intra-Golgi trafficking, with recruitment driven by ARF1 activated by GBF1 at ERGIC and cis-Golgi membranes. | Review; thesis | ER-Golgi trafficking reviews; COPI assembly model | No COPG2-specific kinetics reported; mechanistic model specifies GBF1 as ARF-GEF and coatomer recruitment as an intact unit after ARF1 activation. | (pqac-00000005, pqac-00000002, pqac-00000007) |
| cis- versus trans-Golgi enrichment | Prior localization work summarized in the neuronal differentiation thesis indicates gamma1-COP is enriched at the cis-Golgi, whereas gamma2-COP and COPG2 are enriched at the trans-Golgi. | Thesis citing primary literature | Subcellular localization in mammalian cells | Qualitative compartment bias; no effect size reported in extracted text. | (pqac-00000008) |
| Neuronal differentiation phenotypes | Depletion or loss of gamma1-COP impairs embryoid body formation and especially neurite outgrowth, whereas gamma2-COP loss does not measurably impair neurite extension; gamma2 expressed from the Copg1 locus only partially rescues gamma1 loss. | Thesis; primary experimental summary | P19 pluripotent cells differentiated into neurons; KO and rescue; neurite-length analysis; ultraID interactome framework | Neurite-length analysis reported with n = 12 images and p < 0.0001 in the cited thesis; no increased apoptosis or ER stress with gamma1 or gamma2 depletion in one summary. | (pqac-00000008, pqac-00000009) |
| Imprinting and MESTXL transcriptional interference | COPG2 lies in the MEST/COPG2 imprinted domain. In mouse CNS, an extended MestXL transcript runs about 40 kb into Copg2 and suppresses paternal Copg2 expression, creating maternal bias; truncation of MestXL restores biallelic expression. Human imprinting is reported as debated, ranging from paternal to biallelic expression. | Thesis; locus-regulation study | Mouse CNS imprinting and transcript architecture; human locus comparison | MestXL extends about 40 kb into Copg2; nearby Klf14 noted at about 60 kb; imprinting in human described as unsettled rather than fixed. | (pqac-00000012, pqac-00000007) |
| Disease and immune signaling connections | COPI deficiency can aberrantly activate cGAS/STING signaling; authors showed COPG1 or COPD deletion can induce type I IFN activation, implying inflammatory disease may occur with other COPI-subunit defects. OpenTargets lists modest COPG2 associations with Alzheimer disease, Parkinson disease, multiple sclerosis, lysosomal storage disease, and skeletal abnormalities, but these are association-level rather than gene-specific causal proof. | Primary study; database | COPI-deficient cell models; OpenTargets disease-target evidence | OpenTargets evidence size reported as 5 for listed disease associations; disease scores include about 0.252 to 0.438 depending on phenotype. | (pqac-00000010, pqac-00000011, pqac-00000000) |
| Hepatocyte HDL uptake screen | In an RNAi screen for HDL uptake regulators, COPG2 behaved as a dispensable or paralogous COPI gene: knockdown did not reduce HDL uptake or alter SR-BI mobility, unlike essential COPI subunits; however, COPG2 knockdown increased apoA-I secretion. | Primary preprint | Huh-7 hepatocarcinoma cells; genome-wide and targeted RNAi; HDL uptake and apoA-I secretion assays | ApoA-I secretion increased by 33% after COPG2 knockdown; COPG2 not among six COPI genes limiting HDL uptake. | (pqac-00000004, pqac-00000003, pqac-00000006) |
| Interactome mention | COPG2 appeared in an ANO7 proximity-labeling and interactome study and was one of four proteins followed up by dual fluorescent immunostaining and STED, consistent with vesicle-associated localization in prostate cancer cells. | Primary study | BioID proximity labeling, immunostaining, STED microscopy in LNCaP cells | 64 potentially ANO7-interacting proteins were identified after filtering; COPG2 among highlighted colocalizing candidates. | (pqac-00000000) |


*Table: This table compiles the most relevant evidence for human COPG2, covering identity, trafficking role, localization, neuronal phenotypes, imprinting, disease links, and interactome data. It is useful as a source-tracked overview of what is directly supported versus what remains inferred or debated.*