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Molecular Biology and Evolution, Vol 4, 1-9, Copyright © 1987 by Society for Molecular Biology and Evolution

ORIGINAL ARTICLE

Invasion of the human albumin-alpha-fetoprotein gene family by Alu, Kpn, and two novel repetitive DNA elements

DE Ruffner, CN Sprung, PP Minghetti, PE Gibbs and A Dugaiczyk
Department of Biochemistry, University of California, Riverside 92521.

The human albumin-alpha-fetoprotein genomic domain contains 13 repetitive DNA elements randomly distributed throughout the symmetrical structures of these genes. These repeated sequences are located at different sites within the two genes. The human albumin gene contains five Alu elements within four of its 14 intervening sequences. Two of these repeats are located in intron 2, and the remaining three are located in introns 7, 8, and 11. The human alpha-fetoprotein gene contains three of these Alu elements, one in intron 4 and the remaining two in the 3'-untranslated region. In addition, the human alpha- fetoprotein gene contains a Kpn repeat and two classes of novel repeats that are absent from the human albumin gene. Six of the Alu elements within the two genes are bound by short direct repeats that harbor five base substitutions in 120 possible positions (60 bp times 2 termini). The absence of Alu repeats from analogous positions in rodents indicates that these repeats invaded the albumin-alpha-fetoprotein domain less than 85 Myr ago (the time of mammalian radiation). Furthermore, considering the conservation of terminal repeats flanking the Alu sequences of the albumin-alpha-fetoprotein domain (0.042 changes per site), we submit that the average time of Alu insertion into this gene family could have been as recently as 15-30 Myr ago.
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