Shrinking in the dark:Parallel endosymbiont genome erosions are associated with repeated host transitions to an underground life

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外文摘要：Microbial symbioses have had profound impacts on the evolution of animals.Conversely,changes in host biology may impact the evolutionary trajectory of symbionts themselves.Blattabacterium cuenoti is present in almost all cockroach species and en-ables hosts to subsist on a nutrient-poor diet.To investigate if host biology has impacted Blattabacterium at the genomic level,we sequenced and analyzed 25 genomes from Aus-tralian soil-burrowing cockroaches(Blaberidae:Panesthiinae),which have undergone at least seven separate subterranean,subsocial transitions from above-ground,wood-feeding ancestors.We find at least three independent instances of genome erosion have occurred in Blattabacterium strains exclusive to Australian soil-burrowing cockroaches.These shrink-ages have involved the repeated inactivation of genes involved in amino acid biosynthesis and nitrogen recycling,the core role of Blattabacterium in the host-symbiont relationship.The most drastic of these erosions have occurred in hosts thought to have transitioned un-derground the earliest relative to other lineages,further suggestive of a link between gene loss in Blattabacterium and the burrowing behavior of hosts.As Blattabacterium is unable to fulfill its core function in certain host lineages,these findings suggest soil-burrowing cockroaches must acquire these nutrients from novel sources.Our study represents one of the first cases,to our knowledge,of parallel host adaptations leading to concomitant parallelism in their mutualistic symbionts,further underscoring the intimate relationship between these two partners.

外文关键词：

Blattabacteriumendosymbiosisgene lossmolecular evolutionparallel evolutionsubterranean habitats

作者：

Perry G.Beasley-Hall、Yukihiro Kinjo、Harley A.Rose、James Walker、Charles S.P.Foster、Toby G.L.Kovacs、Thomas Bourguignon、Simon Y.W.Ho、Nathan Lo

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作者单位：

School of Life and Environmental Sciences,University of Sydney,Sydney,New South Wales,Australia

School of Biological Sciences,University of Adelaide,Adelaide,South Australia,Australia

Evolutionary Genomics Unit,Okinawa Institute of Science & Technology Graduate University,Onna-son,Okinawa,Japan

Australian Government Department of Agriculture Water and Environment,Canberra,Australia

School of Biomedical Sciences,University of New South Wales,Sydney,New South Wales,Australia

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出版年：

2024

DOI：

10.1111/1744-7917.13339

中国昆虫科学(英文版)

中国昆虫学会中科院动物所

中国昆虫科学(英文版)

CSTPCD

影响因子：0.484

ISSN：1672-9609

年,卷(期)：2024.31(6)