apolipoprotein c-iv apolipoprotein c-iv apolipoprotein c-iv, also known as apolipoprotein c4, is a protein that in humans is encoded by the apoc4 gene. apoc4identifiersaliasesapoc4, apo-civ, apoc-iv, apolipoprotein c4external idsomim: 600745 mgi: 87878 homologene: 1245 genecards: apoc4 gene location (human)chr.chromosome 19 (human)band19q13.32start44,942,237 bpend44,945,496 bpgene location (mouse)chr.chromosome 7 (mouse)band7 a3|7 9.94 cmstart19,412,008 bpend19,415,404 bprna expression patternbgeehumanmouse (ortholog)top expressed inright lobe of liversural nerveright adrenal glandgallbladderskin of abdomenprostateright lungspleenplacentabloodtop expressed inleft lobe of livergallbladderadrenal glandyolk sacsexually immature organismstomachduodenumthoracic diaphragmadipose tissuezone of skinmore reference expression databiogpsn/agene ontologymolecular function lipid transporter activity cellular component high-density lipoprotein particle extracellular region very-low-density lipoprotein particle biological process lipid transport positive regulation of sequestering of triglyceride triglyceride homeostasis lipid metabolism very-low-density lipoprotein particle assembly very-low-density lipoprotein particle clearance sources:amigo / quickgoorthologsspecieshumanmouseentrez34611425ensemblensg00000267467ensmusg00000074336uniprotp55056q61268refseq (mrna)nm_001646nm_007385refseq (protein)np_001637np_031411location (ucsc)chr 19: 44.94 – 44.95 mbchr 7: 19.41 – 19.42 mbpubmed searchwikidataview/edit humanview/edit mouse function apoc4 is a member of the apolipoprotein c gene family. it is expressed in the liver and has a predicted protein structure characteristic of the other genes in this family. apoc4 is a 3.3-kb gene consisting of 3 exons and 2 introns; it is located 0.5 kb 5' to the apoc2 gene.