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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Persistence or rapid generation of DNA length polymorphism at the zeta-globin locus of humans.

Extensive restriction mapping of 76 human genomic DNAs defines multiple sites of length and point mutation near the zeta-globin locus, which codes for an embryonic alpha-like globin chain. There are two major sites of DNA length variation: one in the intergenic region with three alleles and one in the first intron of the zeta 1 gene with at least four alleles. Our mapping establishes that the intronic polymorphism is associated with a tandem array of short, repeated sequences. The length alleles occur in each of four human populations sampled, suggesting an ancient origin with persistence of several length alleles, or rapid regeneration of these particular variants. Four polymorphic restriction sites were also found; the frequency of polymorphic sites is comparable to that found in the human beta-globin gene region. Analysis of haplotypes indicates either that multiple recombinations have occurred near the 5' end of the zeta 1 gene or that this region is prone to recurrent length mutation.[1]

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