Reciprocal translocation of small numbers of inbred individuals rescues immunogenetic diversity
| Autor: | Jolene T. Sutton, Catherine E. Grueber, Bruce C. Robertson, Sol Heber, Ian G. Jamieson, James V. Briskie |
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| Rok vydání: | 2016 |
| Předmět: |
0301 basic medicine
Population Population genetics Chromosomal translocation Biology Bioinformatics Major Histocompatibility Complex Songbirds 03 medical and health sciences Genetic variation Genetics Inbreeding depression Immunogenetics Animals Inbreeding education Ecology Evolution Behavior and Systematics Alleles education.field_of_study Toll-Like Receptors Genetic Variation Small population size biology.organism_classification 030104 developmental biology Genetics Population Petroica human activities Microsatellite Repeats New Zealand |
| Zdroj: | Molecular ecology. 26(10) |
| ISSN: | 1365-294X |
| Popis: | Genetic rescue can reduce inbreeding depression and increase fitness of small populations, even when the donor populations are highly inbred. In a recent experiment involving two inbred island populations of the New Zealand South Island robin, Petroica australis, reciprocal translocations improved microsatellite diversity and individual fitness. While microsatellite loci may reflect patterns of genome-wide diversity, they generally do not indicate the specific genetic regions responsible for increased fitness. We tested the effectiveness of this reciprocal translocation for rescuing diversity of two immunogenetic regions: Toll-like receptor (TLR) and major histocompatibility complex (MHC) genes. We found that the relatively small number of migrants (seven and ten per island) effectively brought the characteristic TLR gene diversity of each source population into the recipient population. However, when migrants transmitted TLR alleles that were already present at high frequency in the recipient population, it was possible for offspring of mixed heritage to have decreased gene diversity compared to recipient population diversity prior to translocation. In contrast to TLRs, we did not observe substantial changes in MHC allelic diversity following translocation, with limited evidence of a decrease in differentiation, perhaps because most MHC alleles were observed at both sites prior to the translocation. Overall, we conclude that small numbers of migrants may successfully restore the diversity of immunogenetic loci with few alleles, but that translocating larger numbers of animals would provide additional opportunity for the genetic rescue of highly polymorphic immunity regions, such as the MHC, even when the source population is inbred. |
| Databáze: | OpenAIRE |
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