Shumard-Hudspeth D S, Hudspeth M E
Department of Biological Sciences, Northern Illinois University, DeKalb 60115-2861.
Curr Genet. 1990 May;17(5):413-5. doi: 10.1007/BF00334520.
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.
为了评估卵菌纲真菌之间的进化关系，我们构建了致病疫霉一个广寄主范围菌株（695T）线粒体DNA的物理图谱和基因图谱。虽然与其他疫霉属物种一样，这个43.5 kb的环状基因组缺乏典型的卵菌纲大反向重复序列，但已鉴定出一个0.5 - 0.9 kb的短反向重复序列。将七个基因区域的相对顺序与寄主特异性疫霉菌株进行比较，结果显示这些基因座在寄主特异性基因组的三分之一范围内聚集，并且相对于广寄主范围基因组存在两个基因倒位。短反向重复序列的位置表明，至少有一个倒位是重复元件之间分子内重组的结果。
