Host-bacteria interactions: ecological and evolutionary insights from ancient, professional endosymbionts.

IF 10.1 2区 生物学 Q1 MICROBIOLOGY
Zélia Bontemps, Kiran Paranjape, Lionel Guy
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引用次数: 0

Abstract

Interactions between eukaryotic hosts and their bacterial symbionts drive key ecological and evolutionary processes, from regulating ecosystems to the evolution of complex molecular machines and processes. Over time, endosymbionts generally evolve reduced genomes, and their relationship with their host tends to stabilize. However, host-bacteria relationships may be heavily influenced by environmental changes. Here, we review these effects on one of the most ancient and diverse endosymbiotic groups, formed by-among others-Legionellales, Francisellaceae, and Piscirickettsiaceae. This group is referred to as Deep-branching Intracellular Gammaproteobacteria (DIG), whose last common ancestor presumably emerged about 2 Ga ago. We show that DIGs are globally distributed, but generally at very low abundance, and are mainly identified in aquatic biomes. Most DIGs harbour a type IVB secretion system, critical for host-adaptation, but its structure and composition vary. Finally, we review the different types of microbial interactions that can occur in diverse environments, with direct or indirect effects on DIG populations. The increased use of omics technologies on environmental samples will allow a better understanding of host-bacterial interactions and help unravel the definition of DIGs as a group from an ecological, molecular, and evolutionary perspective.

宿主与细菌之间的相互作用:从古老的专业内共生菌中获得的生态学和进化论启示。
真核生物宿主与其细菌共生体之间的相互作用推动着从调节生态系统到复杂分子机器和过程的进化等关键的生态和进化过程。随着时间的推移,内共生菌通常会进化出更小的基因组,它们与宿主的关系也趋于稳定。然而,宿主与细菌的关系可能会受到环境变化的严重影响。在这里,我们回顾了这些影响对一个最古老、最多样化的内共生菌群的影响,该菌群由军团菌科、弗朗西斯菌科和鱼腥草菌科等组成。该菌群被称为深分支胞内伽马蛋白菌(DIG),其最后的共同祖先可能出现在大约 20 亿年前。我们的研究表明,DIG 在全球都有分布,但一般含量很低,主要在水生生物群落中发现。大多数 DIGs 都有一个 IVB 型分泌系统,这对宿主适应至关重要,但其结构和组成各不相同。最后,我们回顾了在不同环境中可能发生的不同类型的微生物相互作用,它们对 DIG 种群有着直接或间接的影响。在环境样本中越来越多地使用 omics 技术将有助于更好地了解宿主与细菌之间的相互作用,并有助于从生态、分子和进化的角度揭示 DIG 作为一个群体的定义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
FEMS microbiology reviews
FEMS microbiology reviews 生物-微生物学
CiteScore
17.50
自引率
0.90%
发文量
45
审稿时长
6-12 weeks
期刊介绍: Title: FEMS Microbiology Reviews Journal Focus: Publishes reviews covering all aspects of microbiology not recently surveyed Reviews topics of current interest Provides comprehensive, critical, and authoritative coverage Offers new perspectives and critical, detailed discussions of significant trends May contain speculative and selective elements Aimed at both specialists and general readers Reviews should be framed within the context of general microbiology and biology Submission Criteria: Manuscripts should not be unevaluated compilations of literature Lectures delivered at symposia must review the related field to be acceptable
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