Genic rearrangements in Phytophthora mitochondrial DNA.
To assess evolutionary relationships among the oomycetous fungi we have constructed a physical and genic map of the mtDNA of a broad host range strain (695T) of Phytophthora megasperma. While, like other Phytophthora species, this 43.5 kb circular genome lacks the typical oomycete large inverted repeat, a short 0.5-0.9 kb inverted repeat has been identified. Comparison of the relative order of seven genic regions with host-specific Phytophthora strains reveals both a clustering of these loci within one-third of the host-specific genomes, and two genic inversions relative to the broad host range genome. The location of the short inverted repeat suggests that at least one of the inversions is a consequence of intramolecular recombination between repeat elements.
Shumard-Hudspeth
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DS
Department of Biological Sciences, Northern Illinois University, DeKalb 60115-2861.
Hudspeth
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ME
D005075:Biological Evolution; D008411:Chytridiomycota / Q000235:genetics*; D004271:DNA, Fungal / Q000235:genetics; D004272:DNA, Mitochondrial / Q000235:genetics*; D010838:Phytophthora / Q000235:genetics*; D011995:Recombination, Genetic; D015183:Restriction Mapping; D012689:Sequence Homology, Nucleic Acid
D004271:DNA, Fungal; D004272:DNA, Mitochondrial