Mechanism of the block to hybridization and selfing between the sympatric ascidiansCiona intestinalis andCiona savignyi

Byrd, Jennifer; Lambert, Charles C.

doi:10.1002/(sici)1098-2795(200001)55:1<109::aid-mrd15>3.0.co;2-b

Cited by 45 publications

(9 citation statements)

References 42 publications

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“…does not allow inferences on the gamete bias observed between the two sibling taxa. Studies of one-way cross-infertility in C. intestinalis support the notion that a multilocus mechanism controls sexual interactions (18,(36)(37)(38)(39)(40)(41)(42).…”

Section: Discussionmentioning

confidence: 84%

Cryptic speciation in a model invertebrate chordate

Caputi

Andreakis²,

Mastrototaro³

et al. 2007

Proc. Natl. Acad. Sci. U.S.A.

178

218

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We applied independent species concepts to clarify the phylogeographic structure of the ascidian Ciona intestinalis, a powerful model system in chordate biology and for comparative genomic studies. Intensive research with this marine invertebrate is based on the assumption that natural populations globally belong to a single species. Therefore, understanding the true taxonomic classification may have implications for experimental design and data management. Phylogenies inferred from mitochondrial and nuclear DNA markers accredit the existence of two cryptic species: C. intestinalis sp. A, genetically homogeneous, distributed in the Mediterranean, northeast Atlantic, and Pacific, and C. intestinalis sp. B, geographically structured and encountered in the North Atlantic. Species-level divergence is further entailed by crossbreeding estimates. C. intestinalis A and B from allopatric populations cross-fertilize, but hybrids remain infertile because of defective gametogenesis. Although anatomy illustrates an overall interspecific similarity lacking in diagnostic features, we provide consistent tools for in-field and in-laboratory species discrimination. Finding of two cryptic taxa in C. intestinalis raises interest in a new tunicate genome as a gateway to studies in speciation and ecological adaptation of chordates.anatomy ͉ Ciona intestinalis ͉ cryptic species ͉ gamete compatibility ͉ phylogenetics

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Section: Discussionmentioning

confidence: 84%

Cryptic speciation in a model invertebrate chordate

Caputi

Andreakis²,

Mastrototaro³

et al. 2007

Proc. Natl. Acad. Sci. U.S.A.

178

218

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“…birds 66 . This is puzzling since developmental features, body plan, effective population size and environment are very similar, and even hybrids can be generated to the tadpole stage 67 . However, C .…”

Section: Discussionmentioning

confidence: 99%

Universality of the DNA methylation codes in Eucaryotes

Aliaga

Bulla

Mouahid

et al. 2019

Sci Rep

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Genetics and epigenetics are tightly linked heritable information classes. Question arises if epigenetics provides just a set of environment dependent instructions, or whether it is integral part of an inheritance system. We argued that in the latter case the epigenetic code should share the universality quality of the genetic code. We focused on DNA methylation. Since availability of DNA methylation data is biased towards model organisms we developed a method that uses kernel density estimations of CpG observed/expected ratios to infer DNA methylation types in any genome. We show here that our method allows for robust prediction of mosaic and full gene body methylation with a PPV of 1 and 0.87, respectively. We used this prediction to complement experimental data, and applied hierarchical clustering to identify methylation types in ~150 eucaryotic species covering different body plans, reproduction types and living conditions. Our analysis indicates that there are only four gene body methylation types. These types do not follow phylogeny (i.e. phylogenetically distant clades can have identical methylation types) but they are consistent within clades. We conclude that the gene body DNA methylation codes have universality similar to the universality of the genetic code and should consequently be considered as part of the inheritance system.

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“…Heterozygote deficiency at nine of our sites ( F IS values significantly greater than zero; Table ) could reflect either selection against heterozygotes or non‐random mating. We can reject selection against heterozygotes as we excluded loci putatively under selection, and we can also exclude selfing as self‐fertilization success is generally low in C. intestinalis (Bouchemousse, Lévêque, Dubois, & Viard, ; Byrd & Lambert, ). A more likely explanation is a Wahlund effect (Wahlund, ), a reduction of expected heterozygosity due to mixing of two genetically differentiated populations, which has been reported in other studies (Dupont, Viard, Dowell, Wood, & Bishop, ; Marescaux et al, ) including studies of Ciona spp.…”

Section: Discussionmentioning

confidence: 99%

Secondary contacts and genetic admixture shape colonization by an amphiatlantic epibenthic invertebrate

Hudson

Johannesson

McQuaid

et al. 2019

Evolutionary Applications

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Research on the genetics of invasive species often focuses on patterns of genetic diversity and population structure within the introduced range. However, a growing body of literature is demonstrating the need to study how native genotypes affect both ecological and evolutionary mechanisms within the introduced range. Here, we used genotyping‐by‐sequencing to study both native and introduced ranges of the amphiatlantic marine invertebrate Ciona intestinalis. A previous study using microsatellites analysed samples collected along the Swedish west coast and showed the presence of genetically distinct lineages in deep and shallow waters. Using 1,653 single nucleotide polymorphisms (SNPs) from newly collected samples (285 individuals), we first confirmed the presence of this depth‐defined genomic divergence along the Swedish coast. We then used approximate Bayesian computation to infer the historical relationship among sites from the North Sea, the English Channel and the northwest Atlantic and found evidence of ancestral divergence between individuals from deep waters off Sweden and individuals from the English Channel. This divergence was followed by a secondary contact that led to a genetic admixture between the ancestral populations (i.e., deep Sweden and English Channel), which originated the genotypes found in shallow Sweden. We then revealed that the colonization of C. intestinalis in the northwest Atlantic was as a result of an admixture between shallow Sweden and the English Channel genotypes across the introduced range. Our results showed the presence of both past and recent genetic admixture events that together may have promoted the successful colonizations of C. intestinalis. Our study suggests that secondary contacts potentially reshape the evolutionary trajectories of invasive species through the promotion of intraspecific hybridization and by altering both colonization patterns and their ecological effects in the introduced range.

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Mechanism of the block to hybridization and selfing between the sympatric ascidiansCiona intestinalis andCiona savignyi

Cited by 45 publications

References 42 publications

Cryptic speciation in a model invertebrate chordate

Cryptic speciation in a model invertebrate chordate

Universality of the DNA methylation codes in Eucaryotes

Secondary contacts and genetic admixture shape colonization by an amphiatlantic epibenthic invertebrate

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