Evidence of differential chromosome loss in aneuploid karyotypes of the Pacific oyster, Crassostrea gigas

• Published in: Genome
• Main Authors: Leitão, A, Boudry, P, Thiriot-Quiévreux, C
• Format: Article in Journal/Newspaper
• Language: English
• Published: Canadian Science Publishing 2001
• Subjects: Genetics; Molecular Biology; General Medicine; Biotechnology; Pacific; Crassostrea gigas; Pacific oyster
• Online Access: http://dx.doi.org/10.1139/g01-035; http://www.nrcresearchpress.com/doi/pdf/10.1139/g01-035

The G-banding technique was performed on aneuploid karyotypes from gill tissue of the Pacific oyster, Crassostrea gigas, to assess whether chromosome losses could be explained by differential chromosomal susceptibility and to clarify the negative correlation between aneuploidy and growth rate previously reported in different populations of this oyster. The study of 95 G-banded aneuploid karyotypes showed that only 4 of the 10 chromosome pairs (viz. 1, 5, 9, and 10) of C. gigas were affected by the loss of one homologous chromosome. Pairs 1, 9, and 10, which were lost in 56, 33, and 44% of cases, respectively, may be considered to be differentially affected. Hypotheses on this differential chromosomal susceptibility are discussed.Key words: aneuploidy, growth, G-banding, karyotype, oyster.