Parallel genome reduction in symbionts descended from closely related free-living bacteria

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60077344%3A_____%2F17%3A00483952" target="_blank" >RIV/60077344:_____/17:00483952 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1038/s41559-017-0237-0" target="_blank" >http://dx.doi.org/10.1038/s41559-017-0237-0</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1038/s41559-017-0237-0" target="_blank" >10.1038/s41559-017-0237-0</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Parallel genome reduction in symbionts descended from closely related free-living bacteria

Popis výsledku v původním jazyce

Endosymbiosis plays an important role in ecology and evolution, but fundamental aspects of the origin of intracellular symbionts remain unclear. The extreme age of many symbiotic relationships, lack of data on free-living ancestors and uniqueness of each event hinder investigations. Here, we describe multiple strains of the bacterium Polynucleobacter that evolved independently and under similar conditions from closely related, free-living ancestors to become obligate endosymbionts of closely related ciliate hosts. As these genomes reduced in parallel from similar starting states, they provide unique glimpses into the mechanisms underlying genome reduction in symbionts. We found that gene loss is contingently lineage-specific, with no evidence for ordered streamlining. However, some genes in otherwise disrupted pathways are retained, possibly reflecting cryptic genetic network complexity. We also measured substitution rates between many endosymbiotic and free-living pairs for hundreds of genes, which showed that genetic drift, and not mutation pressure, is the main non-selective factor driving molecular evolution in endosymbionts.

Název v anglickém jazyce

Parallel genome reduction in symbionts descended from closely related free-living bacteria

Popis výsledku anglicky

Endosymbiosis plays an important role in ecology and evolution, but fundamental aspects of the origin of intracellular symbionts remain unclear. The extreme age of many symbiotic relationships, lack of data on free-living ancestors and uniqueness of each event hinder investigations. Here, we describe multiple strains of the bacterium Polynucleobacter that evolved independently and under similar conditions from closely related, free-living ancestors to become obligate endosymbionts of closely related ciliate hosts. As these genomes reduced in parallel from similar starting states, they provide unique glimpses into the mechanisms underlying genome reduction in symbionts. We found that gene loss is contingently lineage-specific, with no evidence for ordered streamlining. However, some genes in otherwise disrupted pathways are retained, possibly reflecting cryptic genetic network complexity. We also measured substitution rates between many endosymbiotic and free-living pairs for hundreds of genes, which showed that genetic drift, and not mutation pressure, is the main non-selective factor driving molecular evolution in endosymbionts.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10608 - Biochemistry and molecular biology

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Nature Ecology & Evolution

ISSN

2397-334X

e-ISSN

—

Svazek periodika

1

Číslo periodika v rámci svazku

8

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

8

Strana od-do

1160-1167

Kód UT WoS článku

000417188600023

EID výsledku v databázi Scopus

2-s2.0-85030624183