Microsatellite Evolution: Polarity of Substitutions Within Repeats and Neutrality of Flanking Sequences

Overview

Journal Proc Biol Sci

Specialty Biology

Date 1999 May 27

PMID 10343406

Citations 25

Authors

J Brohede

H Ellegren

Affiliations

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Abstract

Though extensively used in a variety of disciplines, the evolutionary pattern of microsatellite sequences is still unclear. We addressed several questions relating to microsatellite evolution by analysing historically accumulated mutation events in a large set of artiodactyl (CA)n repeats, through sequence analysis of orthologous bovine and ovine loci. The substitution rate in microsatellite flanking sequences was not different from that in intron sequences, suggesting that if intron sequences in general are selectively neutral, sequences close to microsatellites are similarly so. This observation thus does not support the idea that successful heterologous amplification of microsatellites across distantly related taxa would be due to flanking sequences generally being under some form of selection. Interestingly, the substitution rate at the first nucleotide positions flanking repeats was significantly higher than in sequences further away. Moreover, the substitution rate in repeat units in the very end of microsatellites was significantly higher than that in the middle of repeat regions. Together these observations suggest a relative instability close to the boundary between repetitive and unique sequences. We present three models that potentially could explain such a feature, all involving inefficiency of mismatch repair systems.

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