The gene for human apolipoprotein CI is located 4.3 kilobases away from the apolipoprotein E gene on chromosome 19.
We have isolated a cDNA clone for apolipoprotein CI and a genomic clone for apolipoprotein E, and by hybridisation and mapping experiments found the gene for apoCI to be located on the genomic apoE clone. The distance between the loci was 4.3 kb.