Genetics of growth rate variation in bivalves: aneuploidy and heterozygosity effects in a Crassostrea gigas family
Enzyme homozygosity and somatic aneuploidy are both known to adversely affect juvenile growth rate in marine bivalves. We have examined the joint effects of these two factors by scoring genotypes at nine segregating allozyme loci and counting the numbers of chromosomes lost in 30 cells in each of 83...
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crcansciencepubl:10.1139/g92-007 2024-04-28T08:16:41+00:00 Genetics of growth rate variation in bivalves: aneuploidy and heterozygosity effects in a Crassostrea gigas family Thiriot-Quiévreux, C. Pogson, G. H. Zouros, E. 1992 http://dx.doi.org/10.1139/g92-007 http://www.nrcresearchpress.com/doi/pdf/10.1139/g92-007 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Genome volume 35, issue 1, page 39-45 ISSN 0831-2796 1480-3321 Genetics Molecular Biology General Medicine Biotechnology journal-article 1992 crcansciencepubl https://doi.org/10.1139/g92-007 2024-04-02T06:55:54Z Enzyme homozygosity and somatic aneuploidy are both known to adversely affect juvenile growth rate in marine bivalves. We have examined the joint effects of these two factors by scoring genotypes at nine segregating allozyme loci and counting the numbers of chromosomes lost in 30 cells in each of 83 full sibs of the Pacific oyster. A highly significant negative correlation was observed between the number of chromosomes missing and shell length in full sibs of the same age. No relationship was seen, however, between allozyme heterozygosity and either shell length or chromosome loss, nor was there any difference in the distribution of aneuploidy among genotypes at any given enzyme locus. Thus, the effects of homozygosity and aneuploidy on growth rate appear to have different genetic bases. Even in the most aneuploid oysters, more than half the cells examined had a complete chromosome complement of 2n = 20. This eliminates somatic aneuploidy as an explanation for the excess of enzyme homozygosity frequently observed in populations of marine molluscs. Significant deviations from Mendelian expectations, favoring homozygotes at some loci and heterozygotes at others, were recorded at eight of the nine allozyme loci, but these occurred independently of the aneuploidy observed. Our results suggest that within families a much larger component of variation in growth rate is due to aneuploidy than to allozyme genotype, but this conclusion cannot, at present, be extended to natural populations.Key words: aneuploidy, heterozygosity, growth rate, oysters. Article in Journal/Newspaper Crassostrea gigas Pacific oyster Canadian Science Publishing Genome 35 1 39 45 |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
topic |
Genetics Molecular Biology General Medicine Biotechnology |
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Genetics Molecular Biology General Medicine Biotechnology Thiriot-Quiévreux, C. Pogson, G. H. Zouros, E. Genetics of growth rate variation in bivalves: aneuploidy and heterozygosity effects in a Crassostrea gigas family |
topic_facet |
Genetics Molecular Biology General Medicine Biotechnology |
description |
Enzyme homozygosity and somatic aneuploidy are both known to adversely affect juvenile growth rate in marine bivalves. We have examined the joint effects of these two factors by scoring genotypes at nine segregating allozyme loci and counting the numbers of chromosomes lost in 30 cells in each of 83 full sibs of the Pacific oyster. A highly significant negative correlation was observed between the number of chromosomes missing and shell length in full sibs of the same age. No relationship was seen, however, between allozyme heterozygosity and either shell length or chromosome loss, nor was there any difference in the distribution of aneuploidy among genotypes at any given enzyme locus. Thus, the effects of homozygosity and aneuploidy on growth rate appear to have different genetic bases. Even in the most aneuploid oysters, more than half the cells examined had a complete chromosome complement of 2n = 20. This eliminates somatic aneuploidy as an explanation for the excess of enzyme homozygosity frequently observed in populations of marine molluscs. Significant deviations from Mendelian expectations, favoring homozygotes at some loci and heterozygotes at others, were recorded at eight of the nine allozyme loci, but these occurred independently of the aneuploidy observed. Our results suggest that within families a much larger component of variation in growth rate is due to aneuploidy than to allozyme genotype, but this conclusion cannot, at present, be extended to natural populations.Key words: aneuploidy, heterozygosity, growth rate, oysters. |
format |
Article in Journal/Newspaper |
author |
Thiriot-Quiévreux, C. Pogson, G. H. Zouros, E. |
author_facet |
Thiriot-Quiévreux, C. Pogson, G. H. Zouros, E. |
author_sort |
Thiriot-Quiévreux, C. |
title |
Genetics of growth rate variation in bivalves: aneuploidy and heterozygosity effects in a Crassostrea gigas family |
title_short |
Genetics of growth rate variation in bivalves: aneuploidy and heterozygosity effects in a Crassostrea gigas family |
title_full |
Genetics of growth rate variation in bivalves: aneuploidy and heterozygosity effects in a Crassostrea gigas family |
title_fullStr |
Genetics of growth rate variation in bivalves: aneuploidy and heterozygosity effects in a Crassostrea gigas family |
title_full_unstemmed |
Genetics of growth rate variation in bivalves: aneuploidy and heterozygosity effects in a Crassostrea gigas family |
title_sort |
genetics of growth rate variation in bivalves: aneuploidy and heterozygosity effects in a crassostrea gigas family |
publisher |
Canadian Science Publishing |
publishDate |
1992 |
url |
http://dx.doi.org/10.1139/g92-007 http://www.nrcresearchpress.com/doi/pdf/10.1139/g92-007 |
genre |
Crassostrea gigas Pacific oyster |
genre_facet |
Crassostrea gigas Pacific oyster |
op_source |
Genome volume 35, issue 1, page 39-45 ISSN 0831-2796 1480-3321 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/g92-007 |
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Genome |
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35 |
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1 |
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39 |
op_container_end_page |
45 |
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1797581700108124160 |