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首页> 外文期刊>Chromosome research: An international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology >Cytogenetic comparison of heteromorphic and homomorphic sex chromosomes in Coccinia (Cucurbitaceae) points to sex chromosome turnover
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Cytogenetic comparison of heteromorphic and homomorphic sex chromosomes in Coccinia (Cucurbitaceae) points to sex chromosome turnover

机译：异胞菌和均匀性性染色体的细胞遗传学比较（Cucurbitaceae）指向性染色体营业额

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摘要

Our understanding of the evolution of plant sex chromosomes is increasing rapidly due to high-throughput sequencing data and phylogenetic and molecular-cytogenetic approaches that make it possible to infer the evolutionary direction and steps leading from homomorphic to heteromorphic sex chromosomes. Here, we focus on four species of Coccinia, a genus of 25 dioecious species, including Coccinia grandis, the species with the largest known plant Y chromosome. Based on a phylogeny for the genus, we selected three species close to C. grandis to test the distribution of eight repetitive elements including two satellites, and several plastid and mitochondrial probes, that we had previously found to have distinct accumulation patterns in the C. grandis genome. Additionally, we determined C-values and performed immunostaining experiments with (peri-)centromere-specific antibodies on two species (for comparison with C. grandis). In spite of no microscopic chromosomal heteromorphism, single pairs of chromosomes in male cells of all three species accumulate some of the very same repeats that are enriched on the C. grandis Y chromosome, pointing to either old (previous) sex chromosomes or incipient (newly arising) ones, that is, to sex chromosome turnover. A 144-bp centromeric satellite repeat (CgCent) that characterizes all C. grandis chromosomes except the Y is highly abundant in all centromeric regions of the other species, indicating that the centromeric sequence of the Y chromosome diverged very recently.
机译：我们对植物性染色体的演变的理解由于高通量测序数据和系统发育和分子细胞遗传学方法而迅速增加，这使得可以推断出从同态性与异常性染色体引起的进化方向和步骤。在这里，我们专注于四种山昔霉素，该物种25种，包括可口可球祖美，具有最大的已知植物Y染色体的物种。基于该属的系统发育，我们选择了三种靠近C. Grandis的物种来测试八种重复元素的分布，包括两颗卫星和几种塑性和线粒体探针，我们以前发现在C中具有不同的积累模式。 Grandis Grancome。另外，我们确定了C值并在两种物种上用（Peri-）Centromere特异性抗体进行免疫染色实验（与C. Grandis比较）。尽管没有显微染色体异常，但所有三种物种的雄细胞中的单对染色体积累了一些非常相同的重复，这些重复在C. grandis y染色体上，指向旧（以前）性染色体或初始（新的）产生），即性别染色体营业额。除了y的所有C. Grandis染色体中的所有C. Grandis染色体中的所有C染色体中的所有C. Grandis染色体在其他物种的所有焦点区域中非常丰富，表明y染色体的焦化序列最近均有含量。

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