Molecular Biology and Evolution, Vol 14, 277-286, Copyright © 1997 by Society for Molecular Biology and Evolution
JV Lopez, M Culver, JC Stephens, WE Johnson and SJ O'Brien
Differential rates of nucleotide substitution among different gene segments
and between distinct evolutionary lineages is well documented among
mitochondrial genes and is likely a consequence of locus-specific selective
constraints that delimit mutational divergence over evolutionary time. We
compared sequence variation of 18 homologous loci (15 coding genes and 3
parts of the control region) among 10 mammalian mitochondrial DNA genomes
which allowed us to describe different mitochondrial evolutionary patterns
and to produce an estimation of the relative order of gene divergence. The
relative rates of divergence of mitochondrial DNA genes in the family
Felidae were estimated by comparing their divergence from homologous
counterpart genes included in nuclear mitochondrial DNA (Numt, pronounced
"new might"), a genomic fossil that represents an ancient transfer of 7.9
kb of mitochondrial DNA to the nuclear genome of an ancestral species of
the domestic cat (Felis catus). Phylogenetic analyses of mitochondrial
(mtDNA) sequences with multiple outgroup species were conducted to date the
ancestral node common to the Numt and the cytoplasmic (Cymt) mtDNA genes
and to calibrate the rate of sequence divergence of mitochondrial genes
relative to nuclear homologous counterparts. By setting the fastest
substitution rate as strictly mutational, an empirical "selective
retardation index" is computed to quantify the sum of all constraints,
selective and otherwise, that limit sequence divergence of mitochondrial
gene sequences over time.
ORIGINAL ARTICLE
Rates of nuclear and cytoplasmic mitochondrial DNA sequence divergence in mammals
Intramural Research Support Program, SAIC, Frederick, Maryland, USA.
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