Can the genomics of ecological speciation be predicted across the divergence continuum from host races to species? A case study in Rhagoletis.
Philos Trans R Soc Lond B Biol Sci
; 375(1806): 20190534, 2020 08 31.
Article
en En
| MEDLINE
| ID: mdl-32654640
ABSTRACT
Studies assessing the predictability of evolution typically focus on short-term adaptation within populations or the repeatability of change among lineages. A missing consideration in speciation research is to determine whether natural selection predictably transforms standing genetic variation within populations into differences between species. Here, we test whether and how host-related selection on diapause timing associates with genome-wide differentiation during ecological speciation by comparing ancestral hawthorn and newly formed apple-infesting host races of Rhagoletis pomonella to their sibling species Rhagoletis mendax that attacks blueberries. The associations of 57 857 single nucleotide polymorphisms in a diapause genome-wide-association study (GWAS) on the hawthorn race strongly predicted the direction and magnitude of genomic divergence among the three fly populations at a field site in Fennville, MI, USA. The apple race and R. mendax show parallel changes in the frequencies of putative inversions on three chromosomes associated with the earlier fruiting times of apples and blueberries compared to hawthorns. A diapause GWAS on R. mendax revealed compensatory changes throughout the genome accounting for the earlier eclosion of blueberry, but not apple flies. Thus, a degree of predictability, although not complete, exists in the genomics of diapause across the ecological speciation continuum in Rhagoletis. The generality of this result is placed in the context of other similar systems. This article is part of the theme issue 'Towards the completion of speciation the evolution of reproductive isolation beyond the first barriers'.
Palabras clave
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Polimorfismo de Nucleótido Simple
/
Tephritidae
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Especiación Genética
/
Genoma de los Insectos
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Estudio de Asociación del Genoma Completo
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Aislamiento Reproductivo
Tipo de estudio:
Prognostic_studies
/
Risk_factors_studies
Límite:
Animals
País como asunto:
America do norte
Idioma:
En
Año:
2020
Tipo del documento:
Article