Bosch Thomas C G
Zoologisches Institut der Christian-Albrechts-Universität zu Kiel, Germany.
Biol Bull. 2012 Aug;223(1):78-84. doi: 10.1086/BBLv223n1p78.
The Hydra holobiont involves at least three types of organisms that all share a long coevolutionary history and appear to depend on each other. Here I review how symbiotic algae and stably associated bacteria interact with the Hydra host and where in the tissue they are located. In particular I discuss the role of Toll-like receptor (TLR) signaling in maintaining Hydra's species-specific microbiota. I also discuss studies in Hydra viridis and its symbiotic Chlorella algae which indicate that the symbiotic algae are critically involved in the control of sexual differentiation in green Hydra. Finally, I review the state of "omics" in this tripartite association and the fact that the functioning of this holobiont is also a tale of several genomes.
水螅共生体至少涉及三种生物，它们都有着漫长的共同进化历史，且似乎相互依存。在此，我将综述共生藻类和稳定关联细菌如何与水螅宿主相互作用，以及它们在组织中的位置。特别地，我将讨论Toll样受体（TLR）信号传导在维持水螅物种特异性微生物群中的作用。我还将讨论绿水螅及其共生小球藻的研究，这些研究表明共生藻类在绿色水螅的性别分化控制中起着关键作用。最后，我将综述这种三方关联中的“组学”状态，以及这个共生体的功能也是几个基因组共同作用的结果这一事实。
