2006
DOI: 10.2108/zsj.23.529
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A Hypothesis of Ploidy Elevation by Formation of a Female Pronucleus in the Androgenetic Clam Corbicula fluminea in the Tone River Estuary, Japan

Abstract: We propose a hypothesis of ploidy elevation in the androgenetic clam Corbicula fluminea, based on an abnormal process of fertilization in clams collected at the Tone River, Ibaraki Prefecture, Japan. Most eggs showed androgenesis, that is, extrusion of all maternal chromosomes as two polar bodies during the first meiotic division. Most eggs did not form a female pronucleus, but only a male pronucleus. However, some eggs proceeded to the second meiosis and formed both a female and a male pronucleus. The formati… Show more

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Cited by 18 publications
(21 citation statements)
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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%
See 1 more Smart Citation
“…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%
“…[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%
“…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%
“…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%