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Title: Genomic Signatures of a Major Adaptive Event in the Pathogenic Fungus Melampsora larici-populina

Abstract

The recent availability of genome-wide sequencing techniques has allowed systematic screening for molecular signatures of adaptation, including in nonmodel organisms. Host–pathogen interactions constitute good models due to the strong selective pressures that they entail. We focused on an adaptive event which affected the poplar rust fungus Melampsora larici-populina when it overcame a resistance gene borne by its host, cultivated poplar. Based on 76 virulent and avirulent isolates framing narrowly the estimated date of the adaptive event, we examined the molecular signatures of selection. Using an array of genome scan methods based on different features of nucleotide diversity, we detected a single locus exhibiting a consistent pattern suggestive of a selective sweep in virulent individuals (excess of differentiation between virulent and avirulent samples, linkage disequilibrium, genotype–phenotype statistical association, and long-range haplotypes). Our study pinpoints a single gene and further a single amino acid replacement which may have allowed the adaptive event. Although our samples are nearly contemporary to the selective sweep, it does not seem to have affected genome diversity further than the immediate vicinity of the causal locus, which can be explained by a soft selective sweep (where selection acts on standing variation) and by the impact of recombination inmore » mitigating the impact of selection. Therefore, it seems that properties of the life cycle of M. larici-populina, which entails both high genetic diversity and outbreeding, has facilitated its adaptation.« less

Authors:
 [1];  [2];  [1];  [1];  [3];  [3];  [3];  [3]; ORCiD logo [4];  [5];  [1];  [1];  [1]; ORCiD logo [6]
  1. National Research Institute for Agriculture, Food and the Environment, Paris (France); Universite de Lorraine, Nancy (France)
  2. National Research Institute for Agriculture, Food and the Environment, Paris (France); Universite de Lorraine, Nancy (France); National Institute for Ocean Science, Nantes (France)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
  5. National Research Institute for Agriculture, Food and the Environment, Orleans (France); Montpellier University (France)
  6. National Research Institute for Agriculture, Food and the Environment, Paris (France); Universite de Lorraine, Nancy (France); Montpellier University (France)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER); French National Research Agency; Region Lorraine and INRAE
OSTI Identifier:
1892180
Grant/Contract Number:  
AC02-05CH11231; ANR-12-ADAP-0009; ANR-18-CE32-0001; ANR-11-LABX-0002-01
Resource Type:
Accepted Manuscript
Journal Name:
Genome Biology and Evolution
Additional Journal Information:
Journal Volume: 14; Journal Issue: 1; Journal ID: ISSN 1759-6653
Publisher:
Society for Molecular Biology and Evolution
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; Population genomics; plant-pathogen interactions; coevolution; genome-wide association studies; genome scan

Citation Formats

Persoons, Antoine, Maupetit, Agathe, Louet, Clémentine, Andrieux, Axelle, Lipzen, Anna, Barry, Kerrie W., Na, Hyunsoo, Adam, Catherine, Grigoriev, Igor V., Segura, Vincent, Duplessis, Sébastien, Frey, Pascal, Halkett, Fabien, and De Mita, Stéphane. Genomic Signatures of a Major Adaptive Event in the Pathogenic Fungus Melampsora larici-populina. United States: N. p., 2021. Web. doi:10.1093/gbe/evab279.
Persoons, Antoine, Maupetit, Agathe, Louet, Clémentine, Andrieux, Axelle, Lipzen, Anna, Barry, Kerrie W., Na, Hyunsoo, Adam, Catherine, Grigoriev, Igor V., Segura, Vincent, Duplessis, Sébastien, Frey, Pascal, Halkett, Fabien, & De Mita, Stéphane. Genomic Signatures of a Major Adaptive Event in the Pathogenic Fungus Melampsora larici-populina. United States. https://doi.org/10.1093/gbe/evab279
Persoons, Antoine, Maupetit, Agathe, Louet, Clémentine, Andrieux, Axelle, Lipzen, Anna, Barry, Kerrie W., Na, Hyunsoo, Adam, Catherine, Grigoriev, Igor V., Segura, Vincent, Duplessis, Sébastien, Frey, Pascal, Halkett, Fabien, and De Mita, Stéphane. Fri . "Genomic Signatures of a Major Adaptive Event in the Pathogenic Fungus Melampsora larici-populina". United States. https://doi.org/10.1093/gbe/evab279. https://www.osti.gov/servlets/purl/1892180.
@article{osti_1892180,
title = {Genomic Signatures of a Major Adaptive Event in the Pathogenic Fungus Melampsora larici-populina},
author = {Persoons, Antoine and Maupetit, Agathe and Louet, Clémentine and Andrieux, Axelle and Lipzen, Anna and Barry, Kerrie W. and Na, Hyunsoo and Adam, Catherine and Grigoriev, Igor V. and Segura, Vincent and Duplessis, Sébastien and Frey, Pascal and Halkett, Fabien and De Mita, Stéphane},
abstractNote = {The recent availability of genome-wide sequencing techniques has allowed systematic screening for molecular signatures of adaptation, including in nonmodel organisms. Host–pathogen interactions constitute good models due to the strong selective pressures that they entail. We focused on an adaptive event which affected the poplar rust fungus Melampsora larici-populina when it overcame a resistance gene borne by its host, cultivated poplar. Based on 76 virulent and avirulent isolates framing narrowly the estimated date of the adaptive event, we examined the molecular signatures of selection. Using an array of genome scan methods based on different features of nucleotide diversity, we detected a single locus exhibiting a consistent pattern suggestive of a selective sweep in virulent individuals (excess of differentiation between virulent and avirulent samples, linkage disequilibrium, genotype–phenotype statistical association, and long-range haplotypes). Our study pinpoints a single gene and further a single amino acid replacement which may have allowed the adaptive event. Although our samples are nearly contemporary to the selective sweep, it does not seem to have affected genome diversity further than the immediate vicinity of the causal locus, which can be explained by a soft selective sweep (where selection acts on standing variation) and by the impact of recombination in mitigating the impact of selection. Therefore, it seems that properties of the life cycle of M. larici-populina, which entails both high genetic diversity and outbreeding, has facilitated its adaptation.},
doi = {10.1093/gbe/evab279},
journal = {Genome Biology and Evolution},
number = 1,
volume = 14,
place = {United States},
year = {Fri Dec 17 00:00:00 EST 2021},
month = {Fri Dec 17 00:00:00 EST 2021}
}

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