Baby fish working out: an epigenetic source of adaptive variation in the cichlid jaw

Hu, Yinan; Albertson, R. Craig

doi:10.1098/rspb.2017.1018

Cited by 36 publications

(43 citation statements)

References 44 publications

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“…Manipulation of Hedgehog signaling in African rift‐lake cichlids and elimination of TH signaling in zebrafish has been shown to alter fish skull remodeling so as to create functional convergence with closely related species that have different feeding mechanics. (Galindo et al, ; Hu & Albertson, ; Hu & Albertson, ; McMenamin et al, ). These findings suggest that changes in skull remodeling may have played a role in the trophic diversification of other fish species.…”

Section: Discussionmentioning

confidence: 99%

“…The cranial bones of many fish species undergo substantial remodeling throughout juvenile development (Figures and ; Table ; Cooper, Wirgau, Sweet, & Albertson, ; Fischer‐Rousseau, Cloutier, & Zelditch, ; Frederich & Vandewalle, ; Frederich et al, ). Multiple signaling pathways have been identified as regulators of bone remodeling in fish skulls (bone morphogenic protein, calcium/calmodulin, fibroblast growth factor, Hedgehog, TH) and the potential for these pathways to influence adaptive changes in trophic morphology has been recognized in each case (Cooper et al, ; Galindo et al, ; Hu & Albertson, ; Okada, Tanaka, & Tagawa, ; Parsons et al, ; Parsons, Taylor, Powder, & Albertson, ). Manipulation of Hedgehog signaling in African rift‐lake cichlids and elimination of TH signaling in zebrafish has been shown to alter fish skull remodeling so as to create functional convergence with closely related species that have different feeding mechanics.…”

Section: Discussionmentioning

confidence: 99%

“…Recent work has shown that changes in TH signaling, which is a major regulator of skull development, bone remodeling and metamorphosis in many vertebrate species, can have large effects on the postlarval development of fish feeding mechanics (Galindo et al, ; McMenamin et al, ). Additional research has identified several more signaling pathways that regulate the remodeling of fish cranial bones (Albertson & Yelick, ; Cooper & Albertson, ; Cooper et al, ; Hu & Albertson, ; Hu & Albertson, ; McMenamin & Parichy, ; Parsons, Andreeva, Cooper, Yelick, & Albertson, ).…”

Section: Discussionmentioning

confidence: 99%

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Functional morphogenesis from embryos to adults: Late development shapes trophic niche in coral reef damselfishes

Cooper

VanHall

Sweet

et al. 2019

Evolution and Development

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The damselfishes are one of the dominant coral reef fish lineages. Their ecological diversification has involved repeated transitions between pelagic feeding using fast bites and benthic feeding using forceful bites. A highly‐integrative approach that combined gene expression assays, shape analyses, and high‐speed video analyses was used to examine the development of trophic morphology in embryonic, larval, juvenile, and adult damselfishes. The anatomical characters that distinguish pelagic‐feeding and benthic‐feeding species do not appear until after larval development. Neither patterns of embryonic jaw morphogenesis, larval skull shapes nor larval bite mechanics significantly distinguished damselfishes from different adult trophic guilds. Analyses of skull shape and feeding performance identified two important transitions in the trophic development of a single species (the orange clownfish; Amphiprion percula): (a) a pronounced transformation in feeding mechanics during metamorphosis; and (b) more protracted cranial remodeling over the course of juvenile development. The results of this study indicate that changes in postlarval morphogenesis have played an important role in damselfish evolution. This is likely to be true for other fish lineages, particularly if they consist of marine species, the majority of which have planktonic larvae with different functional requirements for feeding in comparison to their adult forms.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Functional morphogenesis from embryos to adults: Late development shapes trophic niche in coral reef damselfishes

Cooper

VanHall

Sweet

et al. 2019

Evolution and Development

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“…The “ flexible stem ” hypothesis proposes that phenotypically divergent lineages could result from genetic assimilation of alternative morphs produced by an ancestral plastic species [ 6 ]. This is observed in a few species, and extends to the genetic mechanisms generating morphological diversity [ 49 , 50 ]. Indeed, in a few cases, the same genes involved in the development of a particular trait show transcriptional plasticity in a plastic species and divergence of expression within or between species because of differences in their regulatory sequences.…”

Section: Discussionmentioning

confidence: 99%

bric à brac (bab), a central player in the gene regulatory network that mediates thermal plasticity of pigmentation in Drosophila melanogaster

et al. 2018

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Drosophila body pigmentation has emerged as a major Evo-Devo model. Using two Drosophila melanogaster lines, Dark and Pale, selected from a natural population, we analyse here the interaction between genetic variation and environmental factors to produce this complex trait. Indeed, pigmentation varies with genotype in natural populations and is sensitive to temperature during development. We demonstrate that the bric à brac (bab) genes, that are differentially expressed between the two lines and whose expression levels vary with temperature, participate in the pigmentation difference between the Dark and Pale lines. The two lines differ in a bab regulatory sequence, the dimorphic element (called here bDE). Both bDE alleles are temperature-sensitive, but the activity of the bDE allele from the Dark line is lower than that of the bDE allele from the Pale line. Our results suggest that this difference could partly be due to differential regulation by AbdB. bab has been previously reported to be a repressor of abdominal pigmentation. We show here that one of its targets in this process is the pigmentation gene tan (t), regulated via the tan abdominal enhancer (t_MSE). Furthermore, t expression is strongly modulated by temperature in the two lines. Thus, temperature sensitivity of t expression is at least partly a consequence of bab thermal transcriptional plasticity. We therefore propose that a gene regulatory network integrating both genetic variation and temperature sensitivity modulates female abdominal pigmentation. Interestingly, both bDE and t_MSE were previously shown to have been recurrently involved in abdominal pigmentation evolution in drosophilids. We propose that the environmental sensitivity of these enhancers has turned them into evolutionary hotspots.

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“…the notch signaling pathway is still unclear 74 . A putative homolog of notch1 was also found pathway mediates both fixed as well as phenotypically plastic effects on jaw morphology in 318 East African cichlids[77][78][79] . Hedgehog (hh) further regulates bone morphogenetic protein (BMP) 319 expression in several metazoan lineages76,80,81 and regulatory evolution resulting in divergent 320 expression of BMPs played a pivotal role for craniofacial diversity in both Darwin's finches and 321…”

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confidence: 99%

Radula diversification promotes ecomorph divergence in an adaptive radiation of freshwater snails

Hilgers

Hartmann

Pfaender³

et al. 2020

Preprint

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24Adaptive diversification of complex traits plays a pivotal role for the evolution of organismal 25 diversity. However, the underlying molecular mechanisms remain largely elusive. In the 26 freshwater snail genus Tylomelania, adaptive radiations were likely promoted by trophic 27 specialization via diversification of their key foraging organ, the radula. To investigate the 28 molecular basis of radula diversification and its contribution to lineage divergence, we use 29 pooled tissue-specific transcriptomes of two sympatric Tylomelania sarasinorum ecomorphs. 30We show that divergence in both gene expression and coding sequences is stronger between 31 radula transcriptomes compared to mantle and foot transcriptomes. These findings support the 32 hypothesis that diversifying selection on the radula is driving speciation in Tylomelania 33 radiations. We also identify several candidate genes for radula divergence. Putative homologs 34 of some candidates (hh, arx, gbb) also contributed to trophic specialization in cichlids and 35Darwin's finches, indicating that some molecular pathways may be especially prone to adaptive 36 diversification. 3Main 38 Adaptive radiations provide extreme examples of rapid phenotypic and ecological 39 diversification and therefore feature prominently among model systems for adaptation and 40 speciation 1-6 . In many adaptive radiations, lineage divergence is promoted by diversification of 41 a few traits, like foraging organs, which acted as key adaptive traits in several radiations 3,7-13 . 42Understanding the genetic bases of key adaptive traits is essential because they shape 43 evolutionary trajectories of diversifying lineages 14,15 . Although previous findings are likely 44 biased towards few genes of large effect 2,16 , they also indicate that polygenic selection [17][18][19] , 45 adaptive introgression 20-24 , and regulatory evolution 18,21,25,26 promote diversification in adaptive 46 radiations [17][18][19] . However, much remains to be discovered about the genetic basis of adaptive 47 traits, the molecular evolution underlying their diversification, and their contribution to 48 speciation 2,27 . Particularly, our understanding of gene expression divergence and its 49 contribution to speciation is still in its infancy 28,29 . Here we investigate the genetic basis of 50 diversification of the molluscan key foraging organ (the radula) and its role for lineage 51 divergence in a radiation of freshwater snails, using two sympatric ecomorphs of Tylomelania 52 sarasinorum 30 . 53The genus Tylomelania is endemic to the central Indonesian island Sulawesi and underwent 54 several radiations following colonizations of different lake systems 31,32 . Lacustrine species 55 flocks occur across heterogeneous substrates and exhibit remarkable radula diversity ( Figure 56 1) 33,34 . In contrast, riverine clades occupy relatively homogenous substrates, have uniformly 57 shaped radular teeth and include comparatively few species 33,34 . Additionally, similar radula 58 morphologies likely ...

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Baby fish working out: an epigenetic source of adaptive variation in the cichlid jaw

Cited by 36 publications

References 44 publications

Functional morphogenesis from embryos to adults: Late development shapes trophic niche in coral reef damselfishes

Functional morphogenesis from embryos to adults: Late development shapes trophic niche in coral reef damselfishes

bric à brac (bab), a central player in the gene regulatory network that mediates thermal plasticity of pigmentation in Drosophila melanogaster

Radula diversification promotes ecomorph divergence in an adaptive radiation of freshwater snails

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