Ecological differences among hydrothermal vent symbioses may drive contrasting patterns of symbiont population differentiation.
Ecological differences among hydrothermal vent symbioses may drive contrasting patterns of symbiont population differentiation.
复制标题
DOI：
10.1128/msystems.00284-23
复制
发表时间：
2023-08-31
期刊：
影响因子：
6.4
通讯作者：
中科院分区：
文献类型：
--
作者：
由于宿主遗传、环境和地理因素的相互作用，水平传播的微生物共生体的宿主内组成可以在宿主种群之间变化。虽然适应当地的栖息地条件可以驱动共生菌株的地理细分，它是未知的宿主共生协会之间的生态特征的差异如何影响共生种群的基因组结构。为了解决这个问题，我们对深海贻贝Bathymodiolus septemdierum的不同种群的宏基因组进行了测序，这在西太平洋深海热液喷口很常见，并显示了与同域腹足类共生的生态位分区的特征模式。Bathymodiolus septemdierum与硫氧化化学合成细菌有密切的共生关系，但通过滤食性补充其共生饮食，使其能够占据生态位，而很少暴露于地球化学还原剂。我们的分析表明，共生种群与B。septemdierum的结构由地理位置决定，但优势共生菌株与喷口位置无关。这些模式是在对比共存的Alviniconcha和Ifremeria腹足类共生体，表现出更大的共生体的营养依赖性和占据栖息地的环境条件具有较高的空间变异性。我们的研究结果表明，相对栖息地的同质性结合足够的共生体分散和基因组混合可能会促进持久性的相似的共生菌株在不同的地理位置，而mixotrophy可能会减少选择压力的主机隶属于当地适应的共生菌株。总的来说，这些数据有助于我们了解的潜在机制，影响共生体的人口结构在一系列的海洋微生物共生体，占据对比鲜明的生态位。动物和微生物有机体（共生体）之间的有益关系在自然界中无处不在。在海洋中，微生物共生体通常是从环境中获得的，它们在不同地理位置的组成往往是通过适应当地的栖息地条件而形成的。然而，目前尚不清楚这些模式在具有对比生态特征的共生系统中的可推广性。为了解决这个问题，我们比较了深海热液喷口贻贝和共存但生态不同的蜗牛物种之间的共生体种群结构。我们的分析表明，贻贝共生种群的地理分区较少，并没有表现出对环境适应的证据。我们认为，贻贝的混合营养喂养模式可能会降低其需要与当地适应的共生菌株，而微生境的稳定性和共生体基因组的混合可能有利于跨地理位置的共生菌株的持久性。总之，这些发现进一步加深了我们对海洋环境传播共生体中共生体种群结构形成机制的理解。
The intra-host composition of horizontally transmitted microbial symbionts can vary across host populations due to interactive effects of host genetics, environmental, and geographic factors. While adaptation to local habitat conditions can drive geographic subdivision of symbiont strains, it is unknown how differences in ecological characteristics among host-symbiont associations influence the genomic structure of symbiont populations. To address this question, we sequenced metagenomes of different populations of the deep-sea mussel Bathymodiolus septemdierum, which are common at Western Pacific deep-sea hydrothermal vents and show characteristic patterns of niche partitioning with sympatric gastropod symbioses. Bathymodiolus septemdierum lives in close symbiotic relationship with sulfur-oxidizing chemosynthetic bacteria but supplements its symbiotrophic diet through filter-feeding, enabling it to occupy ecological niches with little exposure to geochemical reductants. Our analyses indicate that symbiont populations associated with B. septemdierum show structuring by geographic location, but that the dominant symbiont strain is uncorrelated with vent site. These patterns are in contrast to co-occurring Alviniconcha and Ifremeria gastropod symbioses that exhibit greater symbiont nutritional dependence and occupy habitats with higher spatial variability in environmental conditions. Our results suggest that relative habitat homogeneity combined with sufficient symbiont dispersal and genomic mixing might promote persistence of similar symbiont strains across geographic locations, while mixotrophy might decrease selective pressures on the host to affiliate with locally adapted symbiont strains. Overall, these data contribute to our understanding of the potential mechanisms influencing symbiont population structure across a spectrum of marine microbial symbioses that occupy contrasting ecological niches. Beneficial relationships between animals and microbial organisms (symbionts) are ubiquitous in nature. In the ocean, microbial symbionts are typically acquired from the environment and their composition across geographic locations is often shaped by adaptation to local habitat conditions. However, it is currently unknown how generalizable these patterns are across symbiotic systems that have contrasting ecological characteristics. To address this question, we compared symbiont population structure between deep-sea hydrothermal vent mussels and co-occurring but ecologically distinct snail species. Our analyses show that mussel symbiont populations are less partitioned by geography and do not demonstrate evidence for environmental adaptation. We posit that the mussel's mixotrophic feeding mode may lower its need to affiliate with locally adapted symbiont strains, while microhabitat stability and symbiont genomic mixing likely favors persistence of symbiont strains across geographic locations. Altogether, these findings further our understanding of the mechanisms shaping symbiont population structure in marine environmentally transmitted symbioses.
登录
查看更多内容
影响因子：
4.1
作者：
Breusing C;Johnson SB;Mitarai S;Beinart RA;Tunnicliffe V
通讯作者：
Tunnicliffe V
影响因子：
5.8
作者：
Gu, Zuguang;Eils, Roland;Schlesner, Matthias
通讯作者：
Schlesner, Matthias
影响因子：
7.7
作者：
Beghini F;McIver LJ;Blanco-Míguez A;Dubois L;Asnicar F;Maharjan S;Mailyan A;Manghi P;Scholz M;Thomas AM;Valles-Colomer M;Weingart G;Zhang Y;Zolfo M;Huttenhower C;Franzosa EA;Segata N
通讯作者：
Segata N
DOI：
10.1093/bioinformatics/btp348
发表时间：
2009-08-01
期刊：
Bioinformatics (Oxford, England)
影响因子：
--
作者：
Capella-Gutiérrez S;Silla-Martínez JM;Gabaldón T
通讯作者：
Gabaldón T
影响因子：
3.4
作者：
Ho PT;Park E;Hong SG;Kim EH;Kim K;Jang SJ;Vrijenhoek RC;Won YJ
通讯作者：
Won YJ