Association between louse abundance and MHC II supertypes in Galapagos mockingbirds

0540769 - BC 2021 RIV DE eng J - Journal Article
Vlček, Jakub - Štefka, Jan
Association between louse abundance and MHC II supertypes in Galapagos mockingbirds.
Parasitology Research. Roč. 119, č. 5 (2020), s. 1597-1605. ISSN 0932-0113. E-ISSN 1432-1955
R&D Projects: GA ČR GPP506/12/P529
Institutional support: RVO:60077344
Keywords : parasite-mediated selection * genetic diversity * chewing lice * resistance * host * ectoparasite * populations * survival * load * size * Arms race * Co-evolution * Immunity * Ectoparasite * Supertype
OECD category: Zoology
Impact factor: 2.289, year: 2020
Method of publishing: Limited access
https://link.springer.com/article/10.1007/s00436-020-06617-3

Major histocompatibility complex class II (MHC II) is an essential molecule triggering the adaptive immune response by the presentation of pathogens to helper T cells. The association between individual MHC II variants and various parasites has become a frequent finding in studies of vertebrate populations. However, although bird ectoparasites have a significant effect on their host's fitness, and the host's immune system can regulate ectoparasitic infections, no study has yet investigated the association between MHC II polymorphism and ectoparasite infection in the populations of free-living birds. Here, we test whether an association exists between the abundance of a chewing louse (Myrsidea nesomimi) and MHC II polymorphism of its hosts, the Galapagos mockingbirds (Mimus). We have found that the presence of two MHC II supertypes (functionally differentiated clusters) was significantly associated with louse abundance. This pattern supports the theory that a co-evolutionary interaction stands behind the maintenance of MHC polymorphism. Moreover, we have found a positive correlation between louse abundance and heterophil/lymphocyte ratio (an indicator of immunological stress) that serves as an additional piece of evidence that ectoparasite burden is affected by immunological state of Galapagos mockingbirds.
Permanent Link: http://hdl.handle.net/11104/0318370