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Heteroduplex analysis of mitochondrial DNA (mtDNA) from evolutionary closely related mammals (rat vs. mouse, man vs. monkey) are analyzed and compared to heteroduplex analysis of mt-DNA from more distantly related mammals (rat vs. man, rat vs. monkey, mouse vs. man, mouse vs. monkey and man vs. cow). Each analysis is transformed into a heteroduplex map and all maps are aligned to restriction enzyme maps and to genetic maps and where possible compared with the known sequence. We show that early evolutionary changes are seen mainly in URF2, URFA6L, URF6 and the D-loop region. The regions of rRNA, URF1, COI and COIII are generally very conserved regions but areas with some evolutionary activity can be localized. Heteroduplex analysis between distantly related species show much more heterology than do closely related species and the heteroduplex maps between all the distantly related species show a common pattern of heterology. Comparisons between the DNA sequence of mtDNA from man, cow and mouse and the equivalent heteroduplex maps show that base pair homologies higher than 73% are displayed as homologous regions. In the heteroduplex analysis of mtDNA's from more closely related species very few heterologies are displayed at 50% formamide but an increase in formamide concentration to 65-70% demonstrate also in these instances general heterologous regions.

Heterology of mitochondrial DNA from mammals detected by electron microscopic heteroduplex analyses