类线粒体基因组的进化:来自类体的见解
Tatiana Orli Milkewitz Sandberg1, Dayana Yahalomi1, Noam Bracha2
1School of Zoology, George S. Wise Faculty of Life Sciences, Tel Aviv University, 6997801, Tel Aviv, Israel.
BMC genomics
|April 22, 2024
概括
菌类动物中的线粒体基因组显示出快速的进化和基因丢失,复杂化了遗传学分析. 然而,细胞氧化酶基因的丧失在myxobolids中并不普遍.
科学领域:
- 寄生虫学的寄生虫学
- 基因组学就是基因组学.
- 进化生物学 进化生物学
背景情况:
- 类动物 (Myxozoa) 是一种多样化的类寄生虫类,由于形态和分子数据有限,它会带来遗传学上的挑战.
- 现有的线粒体 (mt) 基因组数据很少,只有五个完整的基因组被测序,阻碍了全面的遗传学重建.
- 之前的研究指出,在一些Myxobolus物种中缺乏细胞氧化酶基因,而在其他物种中则完全失去mt基因组,这引发了关于基因丢失模式的问题.
研究的目的:
- 评估线粒体基因组作为重建菌群动物遗传关系的标记物的实用性.
- 调查细胞氧化酶基因的损失是否是myxobolid物种中常见的特征.
- 测序和分析五种代表性不足的菌类动物物种的完整线粒体基因组.
主要方法:
- 使用Illumina和牛津纳米孔平台对五个myxozoan线粒体基因组进行测序.
- 生物信息分析用于识别蛋白质编码基因,核糖体RNA (rRNA) 和转移RNA (tRNA).
- 用保存的线粒体基因进行的遗传学重建,并与现有的基于18S rRNA基因的树进行比较.
主要成果:
- 五个新测序的myxozoan mt基因组编码在单个圆形染色体上,与Enteromyxum的分区mt基因组不同.
- 鉴定了五个保存的蛋白质编码基因 (cob, cox1, cox2, nad1, nad5) 和两个rRNA (rnl, rns),但没有发现tRNA.
- 基于这些mt基因的家族遗传学分析证实了基于18SrRNA基因的先前发现,这表明深层家族遗传学分辨率的实用性有限.
结论:
- 细胞染色体氧化酶基因的损失不是myxobolids中普遍存在的特征,这表明基因损失的变化.
- 祖先的myxozoan线粒体基因组很可能是一个单个圆形染色体,等离子体出现在特定的血统中.
- 类线粒体序列被认为是不良的遗传学标志物,原因是重复元素带来的快速进化和组装挑战.
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