Summary
Analysis of rhesus monkey alphoid DNA suggests that it arose by tandem duplication of an ancestral monomer unit followed by independent variation within two adjacent monomers (one becoming more divergent than the other) before their amplification as a dimer unit to produce tandem arrays. The rhesus monkey alphoid DNA is a tandemly repeated, 343-bp dimer; the consensus dimer is over 98% homologous to the alphoid dimers reported for baboon and bonnet monkey, 81% homologous to the African green monkey alpha monomer, and less than 70% homologous to the more divergent human alphoid DNAs. The consensus dimer consists of two wings (I and II, 172 and 171 bp, respectively) that are only 70% homologous to each other, but share seven regions of exact homology. These same regions are highly conserved among the consensus sequences of the other cercopithecid alphoid DNAs. The three alpha-protein binding sites reported for African green monkey alpha DNA by F. Strauss and A. Varshavsky (Cell 37: 889–901, 1984) occur in wings I and II, but with one site altered in wing I. Two cloned dimer segments are 98% homologous to the consensus, each containing 8 single-base-pair differences within the 343-bp segment. Surprisingly, 37% of these differences occur in regions that are evolutionarily conserved in the alphoid consensus sequences, including the alpha-protein binding sites. Sequence variation in this highly repetitive DNA family may produce unique nucleosomal architectures for different members of an alphoid array. These unique architectures may modulate the evolution of these repetitive DNAs and may produce unique centromeric characteristics in primate chromosomes.
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Abbreviations
- AGM:
-
African green monkey
- EBr:
-
ethidium bromide
- EDTA:
-
disodium ethylenediaminetetraacetate
- PEG:
-
polyethylene glycol
- RE:
-
restriction enzyme
- RM:
-
rhesus monkey
- I×SSC buffer:
-
0.15 M NaCl, 0.015 M sodium citrate, pH 7.0
- TBE buffer:
-
50 mM Tris, 50 mM boric acid, 1 mM EDTA
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Pike, L.M., Carlisle, A., Newell, C. et al. Sequence and evolution of rhesus monkey alphoid DNA. J Mol Evol 23, 127–137 (1986). https://doi.org/10.1007/BF02099907
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DOI: https://doi.org/10.1007/BF02099907