A Hypothesis of Ploidy Elevation by Formation of a Female Pronucleus in the Androgenetic Clam Corbicula fluminea in the Tone River Estuary, Japan

Komaru, Akira; Kumamoto, Atsuko; Kato, Takeshi; Ishibashi, Ryo; Obata, Masahiro; Nemoto, Takao

doi:10.2108/zsj.23.529

Cited by 18 publications

(21 citation statements)

References 6 publications

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“…This latter species, then, acts as a surrogate mother [64,65]. Moreover, androgenesis allows an elevation of ploidy when there is mixing of nuclear genomes during incomplete extrusion of the maternal nuclear genome [19,45,46]. …”

Section: Discussionmentioning

confidence: 99%

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Phylogeny and androgenesis in the invasive Corbicula clams (Bivalvia, Corbiculidae) in Western Europe

et al. 2011

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BackgroundThe genus Corbicula is one of the most invasive groups of molluscs. It includes both sexual and androgenetic lineages. The present study re-assessed the different morphotypes and haplotypes of West European Corbicula in order to clarify their taxonomic identification and phylogenetic relationships with American and Asian Corbicula clams. We studied several populations from West European river basins (Meuse, Seine, Rhine and Rhône) through an "integrative taxonomy" approach. We combined morphology, partial mitochondrial COI and cyt b sequences and eleven microsatellite loci. Furthermore, we looked for discrepancies between mtDNA and nrDNA/morphology, indicative of androgenesis between lineages.ResultsThere are three Corbicula morphotypes in Western Europe associated to three mitochondrial lineages and three genotypes. Form R shares the same COI haplotype as the American form A and the Japanese C. leana. Form S and the American form C have the same haplotype, although their morphologies seem divergent. The European form Rlc belongs to the same mitochondrial lineage as both the American form B and the Asian C. fluminea.Interestingly, within each haplotype/genotype or lineage, no genetic diversity was found although their invasive success is high. Moreover, we detected rare mismatches between mtDNA and nrDNA/morphology, indicative of androgenesis and mitochondrial capture between form R and form S and therefore challenging the phylogenetic relatedness and the species status within this genus. The global phylogenetic analysis revealed that the sexual Corbicula lineages seem restricted to the native areas while their androgenetic relatives are widespread and highly invasive.ConclusionsWe clarified the discrepancies and incongruent results found in the literature about the European morphotypes of Corbicula and associated mitochondrial lineages. The three West European morphotypes belong to three distinct nuclear and mitochondrial lineages. However mitochondrial capture occurs in sympatric populations of forms R and S. The species status of the morphotypes therefore remains doubtful. Moreover the androgenetic lineages seem widely distributed compared to their sexual relatives, suggesting that androgenesis and invasive success may be linked in the genus Corbicula.

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Section: Discussionmentioning

confidence: 99%

“…[45,46] observed in laboratory populations of C. leana and C. fluminea that incomplete extrusion of the maternal genome occurs, causing an elevation of ploidy level. Indeed, individuals of C. fluminea of several ploidy levels have been reported (2n: [47]; 3n: [48]; 4n: [48]).…”

Section: Introductionmentioning

confidence: 99%

Phylogeny and androgenesis in the invasive Corbicula clams (Bivalvia, Corbiculidae) in Western Europe

et al. 2011

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“…In eggs fertilized by androgenetic Corbicula, this rotation of the meiotic axis does not occur, and so the entire maternal genome typically is extruded as two polar bodies during meiosis (12,14), leaving only the paternal nuclear genome to form the zygote. However, within-species polyploidization has been observed in the laboratory in some androgenetic lineages, presumably because normal spindle fiber orientation allowed half of the maternal genome to be added to the unreduced paternal genome from the sperm (45). Corbicula seems tolerant of polyploidy [diploid, triploid, and tetraploid Corbicula have been found (46)(47)(48)(49)].…”

Section: Discussionmentioning

confidence: 99%

Rare gene capture in predominantly androgenetic species

Hedtke

Glaubrecht

Hillis

2011

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

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The long-term persistence of completely asexual species is unexpected. Although asexuality has short-term evolutionary advantages, a lack of genetic recombination leads to the accumulation over time of deleterious mutations. The loss of individual fitness as a result of accumulated deleterious mutations is expected to lead to reduced population fitness and possible lineage extinction. Persistent lineages of asexual, all-female clones (parthenogenetic and gynogenetic species) avoid the negative effects of asexual reproduction through the production of rare males, or otherwise exhibit some degree of genetic recombination. Another form of asexuality, known as androgenesis, results in offspring that are clones of the male parent. Several species of the Asian clam genus Corbicula reproduce via androgenesis. We compared gene trees of mitochondrial and nuclear loci from multiple sexual and androgenetic species across the global distribution of Corbicula to test the hypothesis of long-term clonality of the androgenetic species. Our results indicate that low levels of genetic capture of maternal nuclear DNA from other species occur within otherwise androgenetic lineages of Corbicula. The rare capture of genetic material from other species may allow androgenetic lineages of Corbicula to mitigate the effects of deleterious mutation accumulation and increase potentially adaptive variation. Models comparing the relative advantages and disadvantages of sexual and asexual reproduction should consider the possibility of rare genetic recombination, because such events seem to be nearly ubiquitous among otherwise asexual species.Muller's ratchet | Meselson effect | Hill-Robertson effects | phylogenetics

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“…Indeed, partial retention of different maternal genomes is likely to have contributed to the considerable genetic divergence between androgenetic strains and species [2,24,48]. In the most extreme case, maternal genome elimination fails completely and the haploid maternal nucleus fuses with the diploid sperm, resulting in polyploid strains [25].…”

Section: (B) Clams Of the Genus Corbiculamentioning

confidence: 99%