Summary
Linkage has been described between the loci for apolipoprotein E (apoE) and the complement C3 (C3) on chromosome 19. C3 is known to belong to a linkage group with gene order C3-Se-Lu. The present study revealed linkage between Se and apoE with peak lod score +3.3 at recombination fraction 0.08 in males and +1.36 at 0.22 in females, and linkage between apoE and Lu with lod score +4.52 at zero recombination in sexes combined. The C3-apoE linkage gives lod score +4.00 at \(\hat \Theta\)= 0.18 in males, but +0.04 at \(\hat \Theta\)=0.45 in females. Triple heterozygote families confirm that apoE is on the Se side and on the Lu side of C3. Allelic association between apoE and Lu has not been ruled out. Combining our data with published data on C3-Se and Se-Lu, this segment of chromosome 19 has an average sex ratio of female/male recombination of 2.3.
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Gedde-Dahl, T., Olaisen, B., Teisberg, P. et al. The locus for apolipoprotein E (apoE) is close to the Lutheran (Lu) blood group locus on chromosome 19. Hum Genet 67, 178–182 (1984). https://doi.org/10.1007/BF00272996
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DOI: https://doi.org/10.1007/BF00272996