A multispecies BCO2 beak color polymorphism in the Darwin’s finch radiation

Enbody, Erik D; Sprehn, C. Grace; Abzhanov, Arhat; Bi, Huijuan; Dobreva, Mariya P.; Osborne, Owen G.; Rubin, Carl-Johan; Grant, Peter R.; Grant, B. Rosemary; Andersson, Leif

doi:10.1016/j.cub.2021.09.085

Cited by 21 publications

(18 citation statements)

References 82 publications

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“…3B ). The haplotype structure is in contrast to another ancestral polymorphism in Darwin’s finches, at the BCO2 locus controlling nestling beak color, where a single base change constitutes the likely causal mutation ( 51 ). The identification of causal variants within the haplotype blocks described here is challenging because of strong linkage disequilibrium among many sequence variants within each region.…”

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…One hundred one individuals were extracted using a custom salt preparation method [described by Enbody et al ( 51 )] and sequenced using the TruSeq Kit (Illumina, CA). Sixteen additional whole-genome libraries were prepared using a custom Tn5 transposon–based tagmentation protocol derived from Picelli et al ( 63 ) and detailed by Enbody et al ( 51 ). Briefly, we assembled the Tn5 transposon construct using the stock Tn5 (prepared by Karolinska Institutet Protein Science Facility) and the following primers ( 63 ): Tn5MErev: (5′-[phos]CTG TCTCTTATACACATCT-3′), Tn5ME-A (Illumina FC-121-1030) (5′-TCGTCGGCAGCGTCAGATGTGTATAAGAGACAG-3′), and Tn5ME-B (Illumina FC-121-1031) (5′-GTCTCGTGGGCTCGGAGATGTGTATAAGAGACAG-3′).…”

Section: Methodsmentioning

confidence: 99%

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Rapid adaptive radiation of Darwin’s finches depends on ancestral genetic modules

et al. 2022

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Recent adaptive radiations are models for investigating mechanisms contributing to the evolution of biodiversity. An unresolved question is the relative importance of new mutations, ancestral variants, and introgressive hybridization for phenotypic evolution and speciation. Here, we address this issue using Darwin’s finches and investigate the genomic architecture underlying their phenotypic diversity. Admixture mapping for beak and body size in the small, medium, and large ground finches revealed 28 loci showing strong genetic differentiation. These loci represent ancestral haplotype blocks with origins predating speciation events during the Darwin’s finch radiation. Genes expressed in the developing beak are overrepresented in these genomic regions. Ancestral haplotypes constitute genetic modules for selection and act as key determinants of the unusual phenotypic diversity of Darwin’s finches. Such ancestral haplotype blocks can be critical for how species adapt to environmental variability and change.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Rapid adaptive radiation of Darwin’s finches depends on ancestral genetic modules

et al. 2022

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“…By contrast, when Amlou et al (1997) tried to introgress resistance to a fruit toxin from D. sechellia into D. simulans, their attempt failed, likely due to the difficulty of measuring toxicity and to the polygenic nature of survival as a phenotype. Indeed, many known cases of cross-species adaptive introgression involve color variation, for example, coat in wolves (Anderson et al, 2009), skin and hair colors in humans (Dannemann & Kelso, 2017), wing patterns in mimetic butterflies (Edelman et al, 2019), winter-coats in hares (Giska et al, 2019), plumage in pigeons (Vickrey et al, 2018) and wagtails (Semenov et al, 2021), and beaks in Darwin's finches (Enbody et al, 2021).…”

Section: Discussionmentioning

confidence: 99%

Evolution of assortative mating following selective introgression of pigmentation genes between two Drosophila species

David

Ferreira

Jabaud

et al. 2022

Ecology and Evolution

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“…Polymorphisms are often associated with species radiations whereby multiple closely related species harbour similar intraspecific morphs (Enbody et al, 2021; Gray & McKinnon, 2006; Hugall & Stuart‐Fox, 2012; Jamie & Meier, 2020). Independent maintenance of the same CP in multiple species suggests a fitness advantage for the rarer morphs or heterozygotes.…”

Section: Introductionmentioning

confidence: 99%

Multispecies colour polymorphisms associated with contrasting microhabitats in two Mediterranean wrasse radiations

Fark

Gerber

Alonzo

et al. 2022

J of Evolutionary Biology

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Intraspecific colour polymorphisms (CPs) present unique opportunities to study fundamental evolutionary questions, such as the link between ecology and phenotype, mechanisms maintaining genetic diversity and their putative role in speciation. Wrasses are highly diverse in ecology and morphology and harbour a variety of colour‐polymorphic species. In the Mediterranean Sea, wrasses of the tribe Labrini evolved two species radiations each harbouring several species with a brown and a green morph. The colour morphs occur in complete sympatry in mosaic habitats with rocky outcrops and Neptune grass patches. Morph‐specific differences had not been characterized yet and the evolutionary forces maintaining them remained unknown. With genome‐wide data for almost all Labrini species, we show that species with CPs are distributed across the phylogeny, but show evidence of hybridization. This suggests that the colour morphs are either ancient and have been lost repeatedly, that they have evolved repeatedly or have been shared via hybridization. Focusing on two polymorphic species, we find that each colour morph is more common in the microhabitat providing the best colour match and that the morphs exhibit additional behavioural and morphological differences further improving crypsis in their respective microhabitats. We find little evidence for genetic differentiation between the morphs in either species. Therefore, we propose that these colour morphs represent a multi‐niche polymorphism as an adaptation to the highly heterogeneous habitat. Our study highlights how colour polymorphism (CP) can be advantageous in mosaic habitats and that Mediterranean wrasses are an ideal system to study trans‐species polymorphisms, i.e. polymorphisms maintained across several species, in adaptive radiations.

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A multispecies BCO2 beak color polymorphism in the Darwin’s finch radiation

Cited by 21 publications

References 82 publications

Rapid adaptive radiation of Darwin’s finches depends on ancestral genetic modules

Rapid adaptive radiation of Darwin’s finches depends on ancestral genetic modules

Evolution of assortative mating following selective introgression of pigmentation genes between two Drosophila species

Multispecies colour polymorphisms associated with contrasting microhabitats in two Mediterranean wrasse radiations

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