Stern D B, Palmer J D
Nucleic Acids Res. 1986 Jul 25;14(14):5651-66. doi: 10.1093/nar/14.14.5651.
A complete physical map of the spinach mitochondrial genome has been established. The entire sequence content of 327 kilobase pairs (kb) is postulated to occur as a single circular molecule. Two directly repeated elements of approximately 6 kb, located on this "master chromosome", are proposed to participate in an intragenomic recombination event that reversibly generates two "subgenomic" circles of 93 kb and 234 kb. The positions of protein and ribosomal RNA-encoding genes, determined by heterologous filter hybridizations, are scattered throughout the genome, with duplicate 26S rRNA genes located partially or entirely within the 6 kb repeat elements. Filter hybridizations between spinach mitochondrial DNA and cloned segments of spinach chloroplast DNA reveal at least twelve dispersed regions of inter-organellar sequence homology.
已构建出菠菜线粒体基因组的完整物理图谱。整个327千碱基对(kb)的序列内容被假定以单个环状分子的形式存在。位于这条“主染色体”上的两个约6 kb的直接重复元件,被认为参与了一个基因组内的重组事件,该事件可逆地产生两个93 kb和234 kb的“亚基因组”环。通过异源滤膜杂交确定的蛋白质和核糖体RNA编码基因的位置,分散在整个基因组中,重复的26S rRNA基因部分或全部位于6 kb重复元件内。菠菜线粒体DNA与菠菜叶绿体DNA克隆片段之间的滤膜杂交揭示了至少十二个细胞器间序列同源性的分散区域。