Host range of naturally and artificially evolved symbiotic bacteria for a specific host insect

被引:1
作者
Sugiyama, Ryuga [1 ,2 ]
Moriyama, Minoru [1 ]
Koga, Ryuichi [1 ]
Fukatsu, Takema [1 ,2 ,3 ]
机构
[1] Natl Inst Adv Ind Sci & Technol, Bioprod Res Inst, Tsukuba, Japan
[2] Univ Tokyo, Grad Sch Sci, Dept Biol Sci, Tokyo, Japan
[3] Univ Tsukuba, Grad Sch Life & Environm Sci, Tsukuba, Japan
基金
日本科学技术振兴机构;
关键词
Plautia stali; Escherichia coli; Pantoea; stinkbug; gut symbiosis; host specificity; GENOME SEQUENCE; TRANSMISSION; EVOLUTION; APHIDS; LIFE;
D O I
10.1128/mbio.01342-24
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
Diverse insects are intimately associated with specific symbiotic bacteria, where host and symbiont are integrated into an almost inseparable biological entity. These symbiotic bacteria usually exhibit host specificity, uncultivability, reduced genome size, and other peculiar traits relevant to their symbiotic lifestyle. How host-symbiont specificity is established at the very beginning of symbiosis is of interest but poorly understood. To gain insight into the evolutionary issue, we adopted an experimental approach using the recently developed evolutionary model of symbiosis between the stinkbug Plautia stali and Escherichia coli. Based on the laboratory evolution of P. stali-E. coli mutualism, we selected Delta cyaA mutant of E. coli as an artificial symbiont of P. stali that has established mutualism by a single mutation. In addition, we selected a natural cultivable symbiont of P. stali of relatively recent evolutionary origin. These artificial and natural symbiotic bacteria of P. stali were experimentally inoculated to symbiont-deprived newborn nymphs of diverse stinkbug species. Strikingly, the mutualistic E. coli was unable to establish infection and support growth and survival of all the stinkbug species except for P. stali, uncovering that host specificity can be established at a very early stage of symbiotic evolution. Meanwhile, the natural symbiont was able to establish infection and support growth and survival of several stinkbug species in addition to P. stali, unveiling that a broader host range of the symbiont has evolved in nature. Based on these findings, we discuss what factors are relevant to the establishment of host specificity in the evolution of symbiosis.IMPORTANCEHow does host-symbiont specificity emerge at the very beginning of symbiosis? This question is difficult to address because it is generally difficult to directly observe the onset of symbiosis. However, recent development of experimental evolutionary approaches to symbiosis has brought about a breakthrough. Here we tackled this evolutionary issue using a symbiotic Escherichia coli created in laboratory and a natural Pantoea symbiont, which are both mutualistic to the stinkbug Plautia stali. We experimentally replaced essential symbiotic bacteria of diverse stinkbugs with the artificial and natural symbionts of P. stali and evaluated whether the symbiotic bacteria, which evolved for a specific host, can establish infection and support the growth and survival of heterospecific hosts. Strikingly, the artificial symbiont showed strict host specificity to P. stali, whereas the natural symbiont was capable of symbiosis with diverse stinkbugs, which provide insight into how host-symbiont specificity can be established at early evolutionary stages of symbiosis.
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页数:21
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