6533b853fe1ef96bd12ac2ed
RESEARCH PRODUCT
Antagonistic effects of a Mhc class I allele on malaria-infected house sparrows.
Gabriele SorciRomain JulliardPierre FédériciRima ZoorobClaire LoiseauClaire LoiseauJulien BirardStéphane Garniersubject
0106 biological sciencesPlasmodiumMESH : Molecular Sequence DataMESH : DNAGenes MHC Class IMESH: Amino Acid Sequenceco-evolutionMESH: Base SequenceMESH : Microsatellite Repeats01 natural sciencessusceptibilityMESH: SparrowsPleiotropy[ SDV.EE.IEO ] Life Sciences [q-bio]/Ecology environment/SymbiosisMESH: AnimalsMESH : Malaria AvianGenetics0303 health scienceseducation.field_of_studybiologyMESH : Amino Acid Sequence[SDV.BID.EVO]Life Sciences [q-bio]/Biodiversity/Populations and Evolution [q-bio.PE]MESH: DNAMESH: Genetic Predisposition to DiseaseMESH: Genes MHC Class I3. Good healthMESH: Malaria Avian[ SDV.BID.EVO ] Life Sciences [q-bio]/Biodiversity/Populations and Evolution [q-bio.PE]MESH: Haemosporidaavian malariaSparrows[ SDV.MP.PAR ] Life Sciences [q-bio]/Microbiology and Parasitology/ParasitologyMalaria AvianMolecular Sequence DataPopulationMESH: Genetics PopulationMajor histocompatibility complex010603 evolutionary biologyMESH : Genes MHC Class Iresistance03 medical and health sciencesImmune systemAvian malariaMHC class ImedicinePasser domesticusAnimalsGenetic Predisposition to Disease[SDV.MP.PAR]Life Sciences [q-bio]/Microbiology and Parasitology/ParasitologyAmino Acid SequenceAlleleeducationAllelesEcology Evolution Behavior and Systematics030304 developmental biologyparasite competitionMESH: Molecular Sequence DataBase Sequencehouse sparrowMESH: PlasmodiumMESH: Alleles[ SDV.GEN.GA ] Life Sciences [q-bio]/Genetics/Animal geneticsDNAHaemosporidamedicine.diseaseMESH : Genetics PopulationHistocompatibility[SDV.GEN.GA]Life Sciences [q-bio]/Genetics/Animal geneticsGenetics PopulationMESH : PlasmodiumImmunologybiology.proteinMESH : Base SequenceMESH : Genetic Predisposition to DiseaseAntagonistic pleiotropyMESH : SparrowsMESH : AnimalsMESH : HaemosporidaMESH: Microsatellite RepeatsMESH : AllelesMicrosatellite Repeats[SDV.EE.IEO]Life Sciences [q-bio]/Ecology environment/Symbiosisdescription
8 pages; International audience; Genes of the Major Histocompatibility Complex (Mhc) play a fundamental role during the immune response because MHC molecules expressed on cell surface allow the recognition and presentation of antigenic peptides to T-lymphocytes. Although Mhc alleles have been found to correlate with pathogen resistance in several host-parasite systems, several studies have also reported associations between Mhc alleles and an accrued infection risk or an accelerated disease progression. The existence of these susceptibility alleles is puzzling, as the cost generated by the infection should rapidly eliminate them from the population. Here, we show that susceptibility alleles may be maintained in a population of house sparrows (Passer domesticus) if they have antagonistic effects on different malaria parasites. We found that one Mhc class I allele was associated with a 2.5-fold increase in the risk to be infected with a Plasmodium strain, but with a 6.4-fold reduction in the risk to harbour a Haemoproteus strain. We suggest that this antagonistic effect might arise because Mhc genes can alter the competitive interactions between malaria parasites within the host.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2008-03-01 |