| Autor: |
Burgarella, Concetta, Gayral, Philippe, Ballenghien, Marion, Bernard, Aurélien, David, Patrice, Jarne, Philippe, Hurtrez, Sylvie, Galtier, Nicolas, Glémin, Sylvain |
| Rok vydání: |
2018 |
| DOI: |
10.6084/m9.figshare.6024284.v1 |
| Popis: |
Poster presented in the Congress of the European Society for Evolutionary Biology 2015 in Lausanne.Selfing recurrently evolved from outcrossing in many groups, especially in flowering plants.However, selfing species are of recent origin and less numerous than outcrossing ones.Despite short-term advantages, selfing is supposed to be an evolutionary dead-end strategy:selfing species experience reduced effective population size and recombination rates, whichdecrease the efficacy of natural selection. Selfing species should thus go through higherextinction rates because of reduced adaptive potential and/or genomic accumulation ofdeleterious mutations. However, empirical evidences are only partly congruent withtheoretical expectations. Here we analyze coding sequence polymorphism, divergence andexpression levels of two groups of freshwater snails in which mating systems have been stablefor several millions of years. We report strongly reduced genetic diversity, decreased efficacyof purifying selection, slower rate of adaptive evolution and weakened codon usage bias/GC-biased gene conversion in the selfer Galba compared to the outcrosser Physa, in fullagreement with theoretical expectations. Our results demonstrate that self-fertilization, wheneffective in the long run, is a major driver of population genomic and molecular evolutionaryprocesses. We also suggest that the particular ecology of Galba truncatula may buffer theconsequences of the genetic load, shedding new light on the dead-end hypothesis. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
