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Signatures of balancing selection in toll-like receptor (TLRs) genes - novel insights from a free-living rodent.

Abstract：

:Selective pressure from pathogens is considered a key selective force driving the evolution of components of the immune system. Since single components of the immune system may interact with many pathogens, and single pathogens may be recognized by multiple components of the immune system, gaining a better understanding of the mechanisms of parasite-driven selection requires the study of multiple genes and pathogens. Toll-like receptors (TLRs) are a large gene family that code for antigen-presenting components of the innate immune response. In the present paper we characterize polymorphism and signatures of selection in seven TLRs in free-living bank voles Myodes glareolus. We report the first evidence of balancing selection in several TLR genes, supported by positive values of Fu and Li's D* in TLR2 and TLR5, and positive values of Tajima's D in LRR regions within TLR1 and TLR2. We further found significant associations between amino-acid alleles of TLR1 and TLR5 and susceptibility to infection with the blood pathogen Bartonella. Interestingly, selection patterns in TLRs presenting virus-derived motifs (TLR7 and TLR9) differed considerably from those interacting with bacterial PAMPs. In contrast to the highly variable TLRs presenting bacterial motifs, TLR7 and TLR9 had low polymorphism and displayed signatures of directional selection. These findings suggest different functional responses across the TLR gene family and highlight the complexity of parasite-driven selection.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Kloch A,Wenzel MA,Laetsch DR,Michalski O,Bajer A,Behnke JM,Welc-Falęciak R,Piertney SB

doi

10.1038/s41598-018-26672-2

subject

Has Abstract

pub_date

2018-05-30 00:00:00

pages

8361

issue

1

issn

2045-2322

pii

10.1038/s41598-018-26672-2

journal_volume

8

pub_type

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