Low Rates of Bindin Codon Evolution in Lecithotrophic Heliocidaris Sea Urchins

Hart, Michael W.; Popovic, Iva; Emlet, Richard B.

doi:10.1111/j.1558-5646.2012.01606.x

Cited by 8 publications

(4 citation statements)

References 129 publications

(212 reference statements)

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“…), and Heliocidaris bajulus (Hart et al. ), but not in Strongylocentrotus franciscanus (Debenham et al. ), Echinometra lucunter (Geyer and Lessios ), or Heliocidaris erythrogramma (Binks et al.…”

Section: Introductionmentioning

confidence: 99%

“…Differential presence or absence of alleles from clades found to be under positive selection was found among populations of Echinometra oblonga (Geyer and Palumbi 2003) and Mytilus galloprovincialis (Riginos et al 2006;Springer and Crespi 2007), suggesting positive selection has occurred in some, but not all, populations. More traditional approaches using F ST statistics has shown significant population differentiation of reproductive compatibility loci in E. oblonga (Geyer and Palumbi 2003), M. galloprovincialis (Riginos et al 2006), and Heliocidaris bajulus (Hart et al 2012), but not in Strongylocentrotus franciscanus (Debenham et al 2000), Echinometra lucunter (Geyer and Lessios 2009), or Heliocidaris erythrogramma (Binks et al 2012). Other evidence for population-level divergence in reproductive compatibility can be found from experimental work.…”

Section: Introductionmentioning

confidence: 99%

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Sea star populations diverge by positive selection at a sperm‐egg compatibility locus

Sunday

Hart

2013

Ecology and Evolution

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Fertilization proteins of marine broadcast spawning species often show signals of positive selection. Among geographically isolated populations, positive selection within populations can lead to differences between them, and may result in reproductive isolation upon secondary contact. Here, we test for positive selection in the reproductive compatibility locus, bindin, in two populations of a sea star on either side of a phylogeographic break. We find evidence for positive selection at codon sites in both populations, which are under neutral or purifying selection in the reciprocal population. The signal of positive selection is stronger and more robust in the population where effective population size is larger and bindin diversity is greater. In addition, we find high variation in coding sequence length caused by large indels at two repetitive domains within the gene, with greater length diversity in the larger population. These findings provide evidence of population-divergent positive selection in a fertilization compatibility locus, and suggest that sexual selection can lead to reproductive divergence between conspecific marine populations.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sea star populations diverge by positive selection at a sperm‐egg compatibility locus

Sunday

Hart

2013

Ecology and Evolution

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“…; Yang and Swanson ; Zigler and Lessios , ; Hart et al. ) and have been shown to be targets of positive selection for population‐level differences within species of sea urchins (Geyer and Palumbi ), mussels (Riginos et al. ), and sea stars (Sunday and Hart ; Hart et al.…”

Section: Introductionmentioning

confidence: 99%

Selection and demographic history shape the molecular evolution of the gamete compatibility protein bindin in Pisaster sea stars

Popovic

Marko

Wares

et al. 2014

Ecology and Evolution

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Reproductive compatibility proteins have been shown to evolve rapidly under positive selection leading to reproductive isolation, despite the potential homogenizing effects of gene flow. This process has been implicated in both primary divergence among conspecific populations and reinforcement during secondary contact; however, these two selective regimes can be difficult to discriminate from each other. Here, we describe the gene that encodes the gamete compatibility protein bindin for three sea star species in the genus Pisaster. First, we compare the full-length bindin-coding sequence among all three species and analyze the evolutionary relationships between the repetitive domains of the variable second bindin exon. The comparison suggests that concerted evolution of repetitive domains has an effect on bindin divergence among species and bindin variation within species. Second, we characterize population variation in the second bindin exon of two species: We show that positive selection acts on bindin variation in Pisaster ochraceus but not in Pisaster brevispinus, which is consistent with higher polyspermy risk in P. ochraceus. Third, we show that there is no significant genetic differentiation among populations and no apparent effect of sympatry with congeners that would suggest selection based on reinforcement. Fourth, we combine bindin and cytochrome c oxidase 1 data in isolation-with-migration models to estimate gene flow parameter values and explore the historical demographic context of our positive selection results. Our findings suggest that positive selection on bindin divergence among P. ochraceus alleles can be accounted for in part by relatively recent northward population expansions that may be coupled with the potential homogenizing effects of concerted evolution.

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“…Pseudoboletia 21 , and Tripneustes 22 . In an additional genus, Heliocidaris, results are mixed, and depend on the species that are included in the analysis [23][24][25] . Various reasons for these differences have been postulated, but there is no single explanation that fits all genera 1,2,26 .…”

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confidence: 99%

Slow evolution under purifying selection in the gamete recognition protein bindin of the sea urchin Diadema

Geyer

Zigler

Tiozzo

et al. 2020

Sci Rep

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Bindin is a sperm protein that mediates attachment and membrane fusion of gametes. the mode of bindin evolution varies across sea urchin genera studied to date. in three genera it evolves under positive selection, in four under mostly purifying selection, and in one, results have been mixed. We studied bindin evolution in the pantropical sea urchin Diadema, which split from other studied genera 250 million years ago. We found that Diadema bindin is structurally similar to that of other genera, but much longer (418 amino acids). In seven species of Diadema, bindin evolves under purifying selection, more slowly than in any other sea urchin genus. only bindin of the recently rediscovered D. clarki shows evidence of positive selection. As D. clarki is sympatric with D. setosum and D. savignyi, positive selection could arise from avoidance of maladaptive hybridization. However, D. setosum and D. savignyi overlap in the Indo-West Pacific, yet their bindins show no evidence of positive selection, possibly because the two species spawn at different times. Bindin in the East Pacific D. mexicanum, the West Atlantic D. antillarum, the east Atlantic D. africanum, and the Indo-Pacific D. paucispinum also evolves slowly under purifying selection.

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Low Rates of Bindin Codon Evolution in Lecithotrophic Heliocidaris Sea Urchins

Cited by 8 publications

References 129 publications

Sea star populations diverge by positive selection at a sperm‐egg compatibility locus

Sea star populations diverge by positive selection at a sperm‐egg compatibility locus

Selection and demographic history shape the molecular evolution of the gamete compatibility protein bindin in Pisaster sea stars

Slow evolution under purifying selection in the gamete recognition protein bindin of the sea urchin Diadema

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