ArticleBMC biology2026
Differential introgression of mutations reveals selection in spruce.
Article in BMC biology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundNatural selection plays a pivotal role in maintaining genetic boundaries by counteracting the potentially deleterious effects of alleles introduced through hybridization. Here, we investigated this process through a comparative population genomic analysis of three endemic varieties of Picea likiangensis (vars. likiangensis, linzhiensis, and rubescens) across the Qinghai-Tibetan Plateau (QTP) and adjacent regions.
resultsLeveraging genome-wide single nucleotide polymorphism (SNP) data from 193 individuals, we documented pervasive genetic admixture among these taxa, yet observed a pronounced asymmetric pattern of introgression: synonymous polymorphisms (Hs) exhibited significantly higher introgression levels than non-synonymous polymorphisms (Hn). This pattern indicates that purifying selection may actively eliminate maladaptive non-synonymous mutations, whereas neutrally evolving loci continue to undergo gene flow. Moreover, the relative hybrid index (ω
conclusionsOur findings underscore the pivotal role of comparative population genomics in elucidating how natural selection shapes introgression and contributes to the maintenance of genetic boundaries during speciation.
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