What question did this study set out to answer?

To determine whether negative frequency-dependent balancing selection promotes adaptive introgression at the multiallelic self-incompatibility locus between closely related plant species.

August 29, 2008PLoS GeneticsOpen Access

Repeated Adaptive Introgression at a Gene under Multiallelic Balancing Selection

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To determine whether negative frequency-dependent balancing selection promotes adaptive introgression at the multiallelic self-incompatibility locus between closely related plant species.
Identified and analyzed sequence divergence across 18 pairs of shared S-alleles between Arabidopsis halleri and Arabidopsis lyrata.
Quantified nucleotide divergence at four-fold degenerate sites for S-alleles and compared it to background genomic divergence while controlling for effective population size.
Divergence at four-fold degenerate sites across 18 S-allele pairs (K = 0.0193) was approximately four-fold lower than that of the genomic background (K = 0.0743).
Observed divergence patterns reflected a five-fold increase in introgression rates for S-alleles compared to the genomic background, confirming adaptive introgression driven by balancing selection.

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Implication

Comparative genomic analysis reveals elevated introgression at the self-incompatibility locus in Arabidopsis species, indicating balancing selection promotes interspecific gene flow.

Cite This Study

Castric et al. (2008) studied this question.

synapsesocial.com/papers/6a8c67828fecd6ca05946747 https://doi.org/10.1371/journal.pgen.1000168

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Implication

Comparative genomic analysis reveals elevated introgression at the self-incompatibility locus in Arabidopsis species, indicating balancing selection promotes interspecific gene flow.

Repeated Adaptive Introgression at a Gene under Multiallelic Balancing Selection

Key Points

Discussion

Implication

Cite This Study

Repeated Adaptive Introgression at a Gene under Multiallelic Balancing Selection

Key Points

Discussion

Implication

Cite This Study

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