Journal of Lipid Research, Vol 32, 374-379, Copyright © 1991 by Lipid Research, Inc.
Analysis of two different tandem repetitive elements within the human apolipoprotein B gene
EH Ludwig, K Haubold and BJ McCarthy
Cardiovascular Research Institute, University of California, San Francisco 94140-0608.
A large number of copies of the sequence (dTG-dAC)n, where n is between 10
and 60, exist in the human genome, and many are useful as polymorphic
markers. One of these sequences occurs about 3 kilobases 5' of the human
apolipoprotein (apo) B gene as seven distinguishable alleles containing
from (TG)12 to (TG)18. This repeat is also present in the DNA of other
primates. A second alternating purine-pyrimidine sequence with nine
dinucleotide repeats and located in intron 4 is not polymorphic. Together
with the apoB hypervariable repeat immediately 3' of the gene, the (TG)n
sequence will provide a useful haplotype marker capable of distinguishing a
large number of human apoB alleles, some of which may be associated with
disease states.