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• W3159403792 endingPage "e1009552" @default.
• W3159403792 startingPage "e1009552" @default.
• W3159403792 abstract "Host genetic variation plays an important role in the structure and function of heritable microbial communities. Recent studies have shown that insects use immune mechanisms to regulate heritable symbionts. Here we test the hypothesis that variation in symbiont density among hosts is linked to intraspecific differences in the immune response to harboring symbionts. We show that pea aphids ( Acyrthosiphon pisum ) harboring the bacterial endosymbiont Regiella insecticola (but not all other species of symbionts) downregulate expression of key immune genes. We then functionally link immune expression with symbiont density using RNAi. The pea aphid species complex is comprised of multiple reproductively-isolated host plant-adapted populations. These ‘biotypes’ have distinct patterns of symbiont infections: for example, aphids from the Trifolium biotype are strongly associated with Regiella . Using RNAseq, we compare patterns of gene expression in response to Regiella in aphid genotypes from multiple biotypes, and we show that Trifolium aphids experience no downregulation of immune gene expression while hosting Regiella and harbor symbionts at lower densities. Using F1 hybrids between two biotypes, we find that symbiont density and immune gene expression are both intermediate in hybrids. We propose that in this system, Regiella symbionts are suppressing aphid immune mechanisms to increase their density, but that some hosts have adapted to prevent immune suppression in order to control symbiont numbers. This work therefore suggests that antagonistic coevolution can play a role in host-microbe interactions even when symbionts are transmitted vertically and provide a clear benefit to their hosts. The specific immune mechanisms that we find are downregulated in the presence of Regiella have been previously shown to combat pathogens in aphids, and thus this work also highlights the immune system’s complex dual role in interacting with both beneficial and harmful microbes." @default.
• W3159403792 created "2021-05-10" @default.
• W3159403792 creator A5000468687 @default.
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• W3159403792 date "2021-04-26" @default.
• W3159403792 modified "2023-10-09" @default.
• W3159403792 title "Intraspecific variation in immune gene expression and heritable symbiont density" @default.
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• W3159403792 doi "https://doi.org/10.1371/journal.ppat.1009552" @default.
• W3159403792 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/8102006" @default.
• W3159403792 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/33901257" @default.
• W3159403792 hasPublicationYear "2021" @default.
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