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Lusis, A.J. et al.

Regional mapping of human chromosome 19: organization of genes for plasma lipid transport (APOC1, -C2, and -E and LDLR) and the genes C3, PEPD, and GPI.

We report the regional mapping of human chromosome 19 genes for three apolipoproteins and a lipoprotein receptor as well as genes for three other markers. The regional mapping was made possible by the use of a reciprocal whole-arm translocation between the long arm of chromosome 19 and the short arm of chromosome 1. Examination of three separate somatic cell hybrids containing the long arm but not the short arm of chromosome 19 indicated that the genes for apolipoproteins CI, CII, and E (APOC1, APOC2, and APOE, respectively) and glucose-6-phosphate isomerase (GPI) reside on the long arm, whereas genes for the low density lipoprotein receptor (LDLR), complement component 3 (C3), and peptidase D (PEPD) reside on the short arm. When taken together with previous studies, our results suggest the following physical gene map: pter-LDLR-C3-p13.2-PEPD-centromere-(APOE, APOC1, APOC2, GPI)-qter. In addition, we have isolated a single lambda phage carrying both APOC1 and part of APOE. These genes are tandemly oriented and are separated by about 6 kilobases of genomic DNA. Since previous family studies indicate tight linkage of APOE and APOC2, the apolipoprotein genes APOC1, APOC2, and APOE form a tight complex on the long arm of chromosome 19, suggesting the possibility of coordinate regulation.[1]

References

Regional mapping of human chromosome 19: organization of genes for plasma lipid transport (APOC1, -C2, and -E and LDLR) and the genes C3, PEPD, and GPI. Lusis, A.J., Heinzmann, C., Sparkes, R.S., Scott, J., Knott, T.J., Geller, R., Sparkes, M.C., Mohandas, T. Proc. Natl. Acad. Sci. U.S.A. (1986) [Pubmed]

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