RIDGE, a tool tailored to detect gene flow barriers across species pairs - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Molecular Ecology Resources Année : 2024

RIDGE, a tool tailored to detect gene flow barriers across species pairs

Résumé

Characterizing the processes underlying reproductive isolation between diverging lineages is central to understanding speciation. Here, we present RIDGE—Reproductive Isolation Detection using Genomic polymorphisms—a tool tailored for quantifying gene flow barrier proportion and identifying the relevant genomic regions. RIDGE relies on an Approximate Bayesian Computation with a model‐averaging approach to accommodate diverse scenarios of lineage divergence. It captures heterogeneity in effective migration rate along the genome while accounting for variation in linked selection and recombination. The barrier detection test relies on numerous summary statistics to compute a Bayes factor, offering a robust statistical framework that facilitates cross‐species comparisons. Simulations revealed RIDGE's efficiency in capturing signals of ongoing migration. Model averaging proved particularly valuable in scenarios of high model uncertainty where no migration or migration homogeneity can be wrongly assumed, typically for recent divergence times <0.1 2Ne generations. Applying RIDGE to four published crow data sets, we first validated our tool by identifying a well‐known large genomic region associated with mate choice patterns. Second, while we identified a significant overlap of outlier loci using RIDGE and traditional genomic scans, our results suggest that a substantial portion of previously identified outliers are likely false positives. Outlier detection relies on allele differentiation, relative measures of divergence and the count of shared polymorphisms and fixed differences. Our analyses also highlight the value of incorporating multiple summary statistics including our newly developed outlier ones that can be useful in challenging detection conditions.
Fichier principal
Vignette du fichier
Molecular Ecology Resources - 2024 - Burban - RIDGE a tool tailored to detect gene flow barriers across species pairs.pdf (5.92 Mo) Télécharger le fichier
Origine Fichiers éditeurs autorisés sur une archive ouverte
Licence

Dates et versions

hal-04505210 , version 1 (15-03-2024)

Licence

Identifiants

Citer

Ewen Burban, M. I. Tenaillon, Sylvain Glémin. RIDGE, a tool tailored to detect gene flow barriers across species pairs. Molecular Ecology Resources, 2024, Molecular Ecology Resources, ⟨10.1111/1755-0998.13944⟩. ⟨hal-04505210⟩
51 Consultations
26 Téléchargements

Altmetric

Partager

Gmail Mastodon Facebook X LinkedIn More