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. 1989 Dec;86(23):9360–9364. doi: 10.1073/pnas.86.23.9360

Newly arisen DNA repeats in primate phylogeny.

S C Ryan 1, A Dugaiczyk 1
PMCID: PMC298495  PMID: 2480599

Abstract

We discovered the presence of an Alu and an Xba repetitive DNA element within introns 4 and 7, respectively, of the human alpha-fetoprotein (AFP) gene; these elements are absent from the same gene in the gorilla. The Alu element is flanked by 12-base-pair direct repeats, AGGATGTTGTGG ... (Alu) ... AGGATGTTGTGG, which presumably arose by way of duplication of the intronic target site AGGATGTTGTGG at the time of the Alu insertion. In the gorilla, only a single copy of the unoccupied target site is present, which is identical to the terminal repeat flanking the human Alu element. There are two copies of an Xba repeat in the human AFP gene, apparently the only two in the genome. Xba1 and Xba2, located within introns 8 and 7, respectively, differ from each other at 3 of 303 positions. Xba1 is referred to as the old (ancestral) repeat because it lacks direct repeats. The new (derived) Xba2 is flanked by direct repeats, TTTCTTTTT ... (Xba) ... TTTCTTCTT, and is thought to have arisen as a result of transposition of Xba1. The ancestral Xba1 and a single copy of the Xba2 target site are present at orthologous positions in the gorilla, but the new Xba2 is absent. We conclude that the Alu and Xba DNA repeats emerged in the human genome at a time postdating the human-gorilla divergence and became established as genetic novelties in the human lineage. We submit that the chronology of divergence of primate lines of evolution can be correlated with the timing of insertion of new DNA repeats into the genomes of those primates.

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Selected References

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