Abstract:
:Length variation due to tandem repeats is now recognized as a common feature of animal mitochondrial DNA; however, the evolutionary dynamics of repeated sequences are not well understood. Using phylogenetic analysis, predictions of three models of repeat evolution were tested for arrays of 260-bp repeats in the cyprinid fish Cyprinella spiloptera. Variation at different nucleotide positions in individual repeats supported different models of repeat evolution. One set of characters included several nucleotide variants found in all copies from a limited number of individuals, while the other set included an 8-bp deletion found in a limited number of copies in all individuals. The deletion and an associated nucleotide change appear to be the result of a deterministic, rather than stochastic, mutation process. Parallel origins of repeat arrays in different mitochondrial lineages, possibly coupled with a homogenization mechanism, best explain the distribution of nucleotide variation.
journal_name
Mol Biol Evoljournal_title
Molecular biology and evolutionauthors
Broughton RE,Dowling TEdoi
10.1093/oxfordjournals.molbev.a025728subject
Has Abstractpub_date
1997-12-01 00:00:00pages
1187-96issue
12eissn
0737-4038issn
1537-1719journal_volume
14pub_type
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