Immunogenetics

, Volume 24, Issue 2, pp 79–83 | Cite as

Order of class III genes relative to HLA genes determined by the haplotype method

  • Alan N. Wilton
  • Brett Charlton
Article
Received:

Abstract

The B18 C4A3 C4BQ0 BfF1 DR3 haplotype was found to be ideal for determining the order of C4 and Bf relative to HLA-B and DR by the haplotype method. All the copies of this haplotype are assumed to be derived from a single ancestral haplotype. Sixteen of the twenty-six BfFl-containing haplotypes carried all of the alleles from this “ancestral” haplotype. Most of the other BfFl-containing haplotypes could be derived from the “ancestral” haplotype by a single crossover event for one of the two possible gene orders. This suggests that B18 C4A3 C4BQ0 BfFl DR3 is the sole source of the BfFl allele. The uncommon C4 type on B18 C4A3 C4BQ0 BfFl DR3 facilitates recognition of the BfFl-containing products of recombination between Bf and C4. One such recombinant haplotype was found which shows that the orientation of the class III genes is as follows: C4 is closest to HLA-B and Bf is closest to HLA-DR. This gene order is supported by all the earlier unequivocal results obtained using the haplotype method (Olaisen et al. 1983, Marshall et al. 1984a). Combining these results with the information on class III genes obtained from overlapping cosmid clones (Carroll et al. 1984) and earlier mapping studies (Robson and Lamm 1984) shows that HLA-B is telomeric to 21B. C4B, 21A, C4A, Bf and C2 then follow 21B in that order covering 120 kb. HLA-DR is located further toward the centromere.

Keywords

Gene Order Mapping Study Sole Source Early Mapping Crossover Event 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Springer-Verlag 1986

Authors and Affiliations

  • Alan N. Wilton
    • 1
  • Brett Charlton
    • 1
  1. 1.Department of Clinical ImmunologyRoyal Perth HospitalPerthWestern Australia

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