Cospeciation of chemoautotrophic bacteria and deep sea clams
Cospeciation of chemoautotrophic bacteria and deep sea clams
复制标题
DOI：
10.1073/pnas.95.17.9962
复制
发表时间：
1998-08-18
影响因子：
11.1
通讯作者：
Vrijenhoek, RC
中科院分区：
文献类型：
--
作者：
Peek, AS;Feldman, RA;Vrijenhoek, RC
泡囊蛤完全依赖于硫氧化内共生细菌的营养。通过卵细胞质传播的内共生体，如这些，应该表现出一种系统发育模式，与宿主线粒体基因的系统发育密切平行。然而，这种平行模式很少被观察到，因为它们很容易被少量的水平共生体传输或偶尔的主机切换所掩盖。目前的共生体谱系，细菌的小亚基（16S）rDNA序列的基础上，是密切一致的主机谱系，根据蛤线粒体细胞色素氧化酶亚基I和大亚基（16S）rDNA序列。这种系统发育的证据支持共同物种形成的假设和长期的协会之间的参与者在这种共生。
Vesicomyid clams depend entirely on sulfur-oxidizing endosymbiotic bacteria for their nutriment. Endosymbionts that are transmitted cytoplasmically through eggs, such as these, should exhibit a phylogenetic pattern that closely parallels the phylogeny of host mitochondrial genes. Such parallel patterns are rarely observed, however, because they are obscured easily by small amounts of horizontal symbiont transmission or occasional host switching. The present symbiont genealogy, based on bacterial small subunit (16S) rDNA sequences, was closely congruent with the host genealogy, based on clam mitochondrial cytochrome oxidase subunit I and large subunit (16S) rDNA sequences. This phylogenetic evidence supports the hypothesis of cospeciation and a long term association between the participants in this symbiosis.