The negative correlation between somatic aneuploidy and growth in the oyster<i>Crassostrea gigas</i>and implications for the effects of induced polyploidization

Ζούρος, Ε.; Thiriot-Quiévreux, Catherine; Kotoulas, Georgios

doi:10.1017/s0016672300033991

Cited by 43 publications

(26 citation statements)

References 33 publications

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“…Aneuploidy has been documented in Mytilus edulis from a polluted area (Dixon 1982), but its significance in explaining heterozygote deficiency remains unclear. In addition, in the oyster Crassostrea gigas, where this problen~ has been thoroughly studied, aneuploidy has been found to be an unlikely explanation for this phenomenon (Zouros et al 1996). The presence of null alleles at isozymic loci have been studied for Mytilus, and their low observed frequency in natural populations or during crosses cannot account for the level of heterozygote deficiency usually found (Mallet et al 1985, Beaumont 1991, Gardner 1992.…”

Section: Discussionmentioning

confidence: 99%

Heterozygote deficiency in the mussel Mytilus edulis species complex revisited

Raymond¹,

Vaanto²,

Thomas³

et al. 1997

Mar. Ecol. Prog. Ser.

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In order to understand the phenomenon of heterozygote deficiency (F,,) in m a n n e molluscs, all the relevant literature concerning this phenomenon in the Mytilus edulis species complex was reviewed. Due to large heterogeneity in methods of data analysis, in particular for the choice of the estimator measuring heterozygote dcficiency and for the choice of the testing procedure, no clear overview was possible. To overcome this problem, similar est~mators and tests were used to analyze or re-anallze some additional large data sets from the Baltic [M. trossulus), France (M. galloprovincialis), England [ M edulis), Atlantic USA (M. edulis) and Pacific US-A (M. trossulus). La.rge and significant heterozygote deficiencies exist in these data sets. Estimated F,, (Fls) values are generally h!gher for Lap than for other loci, consistent with a n effect of selection. No other significant variation of F,, values across loci within each data set or across data sets for each locus was detected, however no specific test has been designed for this null hypothesis. The possible contribution of a Wahlund effect to explain the heterozygote deficiency is discussed. It is likely that there is no unique explanation of heterozygote defic~ency (such as a M'ahlund effect or selection) in M. edulis or in other organisms, and that speciesspecific, locus-specific or populat~on-specific explanat~ons are to be sought

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Section: Discussionmentioning

confidence: 99%

Heterozygote deficiency in the mussel Mytilus edulis species complex revisited

Raymond¹,

Vaanto²,

Thomas³

et al. 1997

Mar. Ecol. Prog. Ser.

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“…Aneuploids at the triploid level were not significantly different from triploids, probably due to small sample size (Wang et al, 1999). Negative correlations between somatic aneuploidy (or hypodiploidy) and growth has been reported in the Pacific oyster (Thiriot-Quievreux et al, 1988;Zouros et al, 1996;Leitao et al, 2001). Zouros et al (1996) has proposed that the negative correlation between aneuploidy and growth is caused by unmasking of deleterious genes from progressive haploidization or chromosome loss.…”

Section: Chromosome Number and Body Sizementioning

confidence: 97%

“…Negative correlations between somatic aneuploidy (or hypodiploidy) and growth has been reported in the Pacific oyster (Thiriot-Quievreux et al, 1988;Zouros et al, 1996;Leitao et al, 2001). Zouros et al (1996) has proposed that the negative correlation between aneuploidy and growth is caused by unmasking of deleterious genes from progressive haploidization or chromosome loss. The observation in this study, that hyperdiploids are also smaller than normal diploids, argues against the unmasking hypothesis.…”

Section: Chromosome Number and Body Sizementioning

confidence: 99%

Chromosome inheritance in triploid Pacific oyster Crassostrea gigas Thunberg

Gong

Yang²,

Zhang

et al. 2004

Heredity

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Reproduction and chromosome inheritance in triploid Pacific oyster (Crassostrea gigas Thunberg) were studied in diploid female Â triploid male (DT) and reciprocal (TD) crosses. Relative fecundity of triploid females was 13.4% of normal diploids. Cumulative survival from fertilized eggs to spat stage was 0.007% for DT crosses and 0.314% for TD crosses. Chromosome number analysis was conducted on surviving progeny from DT and TD crosses at 1 and 4 years of age. At Year 1, oysters from DT crosses consisted of 15% diploids (2n ¼ 20) and 85% aneuploids. In contrast, oysters from TD crosses consisted of 57.2% diploids, 30.9% triploids (3n ¼ 30) and only 11.9% aneuploids, suggesting that triploid females produced more euploid gametes and viable progeny than triploid males. Viable aneuploid chromosome numbers included 2n þ 1, 2n þ 2, 2n þ 3, 3nÀ2 and 3nÀ1. There was little change over time in the overall frequency of diploids, triploids and aneuploids. Among aneuploids, oysters with 2n þ 3 and 3nÀ2 chromosomes were observed at Year 1, but absent at Year 4. Triploid progeny were significantly larger than diploids by 79% in whole body weight and 98% in meat weight at 4 years of age. Aneuploids were significantly smaller than normal diploids. This study suggests that triploid Pacific oyster is not completely sterile and cannot offer complete containment of cultured populations.

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“…However recent studies showed a lack of correlation between the degree of aneuploidy and the electrophoretic phenotype in oysters (Zouros et al 1996). Genomic imprinting could theoretically generate heterozygote deficiencies (Chakraborty 1989), but has received so far no empirical support in bivalves.…”

Section: Pgm-93mentioning

confidence: 99%