6533b7ddfe1ef96bd1274076
RESEARCH PRODUCT
Diversifying selection on MHC class I in the house sparrow (Passer domesticus).
Olivier ChastelGabriele SorciMurielle RichardClaire LoiseauRomain JulliardStéphane GarnierRima Zoorobsubject
0106 biological sciencesMESH : Gene FlowMESH: Selection (Genetics)MESH: GeographyGenes MHC Class IMESH: Genetic MarkersBalancing selectionMESH : Microsatellite Repeats[ SDV.IMM.IA ] Life Sciences [q-bio]/Immunology/Adaptive immunology01 natural sciencesmicrosatellitesMESH: SparrowsMESH : Genetic MarkersMESH: AnimalsMESH: Genetic VariationMESH: Evolution MolecularGenetics0303 health scienceseducation.field_of_studyGeographybiology[SDV.BID.EVO]Life Sciences [q-bio]/Biodiversity/Populations and Evolution [q-bio.PE]MESH : GeographyMESH: Genes MHC Class I[ SDE.MCG ] Environmental Sciences/Global Changes[ SDV.BID.EVO ] Life Sciences [q-bio]/Biodiversity/Populations and Evolution [q-bio.PE][SDV.IMM.IA]Life Sciences [q-bio]/Immunology/Adaptive immunologyMate choiceMESH: Stochastic ProcessesMHC class IMESH : MutationSparrowsGene FlowGenetic MarkersMESH: Mutationbalancing selection[SDE.MCG]Environmental Sciences/Global ChangesPopulationMESH : Genetic DriftMESH: Genetics Populationchemical and pharmacologic phenomenaMESH : Stochastic ProcessesMajor histocompatibility complex010603 evolutionary biologyMESH : Genes MHC Class IEvolution Molecular03 medical and health sciencesMESH : Genetic VariationMHC class IGeneticsPasser domesticusMESH : Selection (Genetics)AnimalsMESH : Evolution MolecularSelection GeneticMESH: Genetic DrifteducationAllelesMESH: Gene FlowEcology Evolution Behavior and SystematicsSelection (genetic algorithm)030304 developmental biologyLocal adaptationIsolation by distanceStochastic Processes[ SDE.BE ] Environmental Sciences/Biodiversity and Ecologyhouse sparrowMESH: AllelesGenetic DriftGenetic Variationdiversifying selectionPasser domesticus.[ SDV.GEN.GA ] Life Sciences [q-bio]/Genetics/Animal geneticsMESH : Genetics Population[SDE.ES]Environmental Sciences/Environmental and Society[SDV.GEN.GA]Life Sciences [q-bio]/Genetics/Animal geneticsGenetics PopulationEvolutionary biologyMutationbiology.proteinMESH: Microsatellite RepeatsMESH : AnimalsMESH : Sparrows[SDE.BE]Environmental Sciences/Biodiversity and EcologyMESH : Alleles[ SDE.ES ] Environmental Sciences/Environmental and SocietyMicrosatellite Repeatsdescription
10 pages; International audience; Genes of the major histocompatibility complex (MHC) are the most polymorphic loci known in vertebrates. Two main hypotheses have been put forward to explain the maintenance of MHC diversity: pathogen-mediated selection and MHC-based mate choice. Host-parasite interactions can maintain MHC diversity via frequency-dependent selection, heterozygote advantage, and diversifying selection (spatially and/or temporally heterogeneous selection). In this study, we wished to investigate the nature of selection acting on the MHC class I across spatially structured populations of house sparrows (Passer domesticus) in France. To infer the nature of the selection, we compared patterns of population differentiation based on two types of molecular markers: MHC class I and microsatellites. This allowed us to test whether the observed differentiation at MHC genes merely reflects demographic and/or stochastic processes. At the global scale, diversifying selection seems to be the main factor maintaining MHC diversity in the house sparrow. We found that (i) overall population differentiation at MHC was stronger than for microsatellites, (ii) MHC marker showed significant isolation by distance. In addition, the slope of the regression of F(ST) on geographical distance was significantly steeper for MHC than for microsatellites due to a stronger pairwise differentiation between populations located at large geographical distances. These results are in agreement with the hypothesis that spatially heterogeneous selective pressures maintain different MHC alleles at local scales, possibly resulting in local adaptation.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2009-04-01 |