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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1980 Apr;77(4):2129–2133. doi: 10.1073/pnas.77.4.2129

DNA sequence of baboon highly repeated DNA: evidence for evolution by nonrandom unequal crossovers.

L Donehower, C Furlong, D Gillespie, D Kurnit
PMCID: PMC348665  PMID: 6246524

Abstract

A highly repeated DNA was isolated from the West African baboon (Papio papio) as a 343-base-pair fragment after digestion of total baboon DNA with the restriction endonuclease BamHI. The DNA sequence of this fragment was obtained by chemical cleavage methods and is compared with the DNA sequence of related highly repeated primate DNAs from African green monkey (Cercopithecus aethiops) and man. The 343-base-pair baboon repeat consists of two related but nonidentical wings of 172 and 171 base pairs, respectively. The baboon 172-base-pair wing shares more homology with the African green monkey 172-base-pair repeat than with the baboon 171-base-pair wing. Comparison with the previously published monkey and human DNA sequences indicates that: (i) All the DNA sequences apparently arose from a common ancestral sequence. (ii) Evolution of the primate DNA sequences can be explained by a model involving unequal crossovers at specific points within the repeated DNA, possibly mediated by the sequence 5'-AAGG-3' 3'-TTCC-5' or its invert 5'-GGAA-3' 3'-CCTT-5'. (iii) There are alternating domains of conserved and divergent DNA sequences within each greater than 170-base-pair wing sequence. Taken together, the DNA sequences of these primates suggest a model whereby highly repeated DNAs are established and evolve as a consequence of unequal nonrandom exchanges of DNA duplexes. These exchanges may be mediated by short repeated nucleotide sequences and involve exchanges within and between the greater than 170-base-pair wings.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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