APOC4 encodes a small apolipoprotein within the apolipoprotein E/C-I/C-II gene cluster, comprising 127 residues with a 25-residue signal peptide and two predicted amphipathic alpha-helical domains, expressed at low levels in human liver PMID:8530039. The amphipathic helical architecture is consistent with lipid association characteristic of exchangeable apolipoproteins, and genetic variation at the locus links apoC-IV to triglyceride metabolism [PMID:8530039, PMID:10996355]. Beyond this molecular characterization and its association with lipid traits, no enzymatic activity, receptor interaction, or reconstituted mechanism for apoC-IV has been characterized in the available corpus.
| Year | Confidence | Finding | PMIDs | Journal |
|---|---|---|---|---|
| 1995 | Medium | APOC4 was identified as a new human gene within the apolipoprotein E/C-I/C-II gene locus. Nucleotide sequence analysis revealed a 3.3-kb gene with three exons and two introns. The predicted apoC-IV protein comprises 127 amino acid residues with a putative 25-residue signal peptide and two potential amphipathic alpha-helical domains. RNase protection analysis showed relatively low apoC-IV mRNA levels in human liver compared to apoC-II mRNA levels. | PMID:8530039 | Genomics |
| 2000 | Low | Genetic variation in APOC4 (specifically Leu36Pro and Leu96Arg polymorphisms) was significantly associated with triglyceride levels in women, consistent with a role for apoC-IV in triglyceride metabolism. Three coding mutations predicting amino acid substitutions (Leu36Pro, Gly52Asp, Leu96Arg) were identified by SSCP and DNA sequencing. | PMID:10996355 | Atherosclerosis |
| 2024 | Low | APOC4 protein was found to bind to hydroxyapatite (HAP) spherules within sub-retinal pigment epithelial deposits in age-related macular degeneration. Quantitative SWATH-MS proteomics showed significant differences in HAP-bound APOC4 levels between CFH risk-variant carriers and wild-type individuals, and immunofluorescence confirmed APOC4 presence at the RPE/choroid interface associated with sub-RPE spherules. | PMID:29580721 | Experimental eye research |
| 2021 | Low | APOC4 was identified as a target gene of hsa-miR-372-3p in the NEAT1/hsa-miR-372-3p/AGPS/APOC4 axis involved in rapamycin-induced triglyceride accumulation. Bioinformatics and experimental analyses predicted APOC4 as a downstream target involved in TG metabolism dysregulation. | PMID:33705959 | Free radical biology & medicine |