Meland S, Johansen S, Johansen T, Haugli K, Haugli F
Department of Cell Biology, University of Tromsø, Norway.
Curr Genet. 1991 Jan;19(1):55-9. doi: 10.1007/BF00362088.
Five haploid amoebal strains of the myxomycete Physarum polycephalum, each with a distinct mitochondrial genotype, were crossed in all pairwise combinations. The mitochondrial genotype in the diploid plasmodia resulting from these isogamous matings were found to be transmitted uniparentally. This uniparental inheritance could be arranged in a dominant hierarchical order. Time-course analysis of the presence of mitochondrial genotypes in the zygotes and young developing plasmodia show that elimination of one parental mitochondrial genotype is virtually completed during the first two nuclear cycles in the zygote/differentiating plasmodium. To our knowledge this is the first report indicating an active mechanism involving the degradation of mitochondrial genomes in sexual crosses.
多头绒泡菌的五个单倍体变形虫菌株，每个菌株都有独特的线粒体基因型，将它们进行了所有可能的两两杂交。结果发现，这些同配交配产生的二倍体原质团中的线粒体基因型是单亲遗传的。这种单亲遗传可以按照显性等级顺序排列。对合子和发育中的幼嫩原质团中线粒体基因型存在情况的时间进程分析表明，在合子/分化中的原质团的前两个核周期内，一个亲本的线粒体基因型的消除实际上已经完成。据我们所知，这是第一份表明在有性杂交中存在涉及线粒体基因组降解的活跃机制的报告。
