Nonuniform recombination within the human beta-globin gene cluster

Am J Hum Genet. 1984 Nov;36(6):1239-58.

Abstract

Population genetic analysis of 15 restriction site polymorphisms demonstrates nonuniform recombination within the human beta-globin gene cluster. These DNA polymorphisms show two clusters of high nonrandom associations, one 5' and another 3' to the beta-globin structural gene, with no significant linkage disequilibrium between the two clusters. The 5'- and 3'-association clusters are 34.6 kilobases (kb) and 19.4 kb long, respectively, and are separated by 9.1 kb of DNA immediately 5' to the beta-globin gene. For each of these three DNA regions, we have observed a relationship between nonrandom associations and physical distance between the polymorphisms. However, this relationship differed for each of these regions. On the assumption that the effective population size (Ne) is 5,000-50,000, we estimate the total recombination rate to be 0.0017%-0.0002% in the 5' cluster, 0.0931%-0.0093% in the 3' cluster, and 0.2912%-0.0219% in the 9.1-kb region between them. The beta cluster thus shows nonuniformity in recombination. Moreover, the recombination rate in the 9.1-kb DNA segment is 3-30 times greater than expected and is thus a hot spot for meiotic recombination.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • African Continental Ancestry Group
  • Animals
  • Continental Population Groups
  • DNA Restriction Enzymes / metabolism
  • European Continental Ancestry Group
  • Genes
  • Genetics, Population
  • Globins / genetics*
  • Haploidy
  • Humans
  • Mice
  • Polymorphism, Genetic
  • Recombination, Genetic*

Substances

  • Globins
  • DNA Restriction Enzymes