Chromosomal organization of simple sequence repeats in the Pacific oyster (Crassostrea gigas): (GGAT)(4), (GT)(7) and (TA)(10) chromosome patterns
|Author(s)||Bouilly Karine1, Chaves R.1, Leitao A.1, 2, Benabdelmouna Abdellah3, Guedes Pinto H.1|
|Affiliation(s)||1 : UTAD, CGB, IBB, P-5001801 Vila Real, Portugal.
2 : So Reg Ctr Fisheries Res CRIP Sul, IPIMAR, P-8700305 Olhao, Portugal.
3 : IFREMER, Lab Genet & Pathol, F-17390 La Tremblade, France.
|Source||Journal of Genetics (0022-1333) (Indian Academy of Sciences), 2008-08 , Vol. 87 , N. 2 , P. 119-125|
|WOS© Times Cited||7|
|Keyword(s)||Simple sequence repeats (SSRs), Mollusks, Fluorescence in situ hybridization (FISH), Crassostrea gigas, Chromosome identification|
|Abstract||Chromosome identification is essential in oyster genomic research. Fluorescence in situ hybridization (FISH) offers new opportunities for the identification of oyster chromosomes. It has been used to locate satellite DNAs, telomeres or ribosomal DNA sequences. However, regarding chromosome identification, no study has been conducted with simple sequence repeats (SSRs). FISH was used to probe the physical organization of three particular SSRs, (GGAT)(4), (GT)(7) and (TA)(10) onto metaphase chromosomes of the Pacific oyster, Crassostrea gigas. Hybridization signals were observed in all the SSR probes, but the distribution and intensity of signals varied according to the oligonucleotide repeat. The intercalary, centromeric and telomeric bands were observed along the chromosomes, and for each particular repeat every chromosome pair presented a similar pattern, allowing karyotypic analysis with all the SSRs tested. Our study is the first in mollusks to show the application of SSR in situ hybridization for chromosome identification and karyotyping. This technique can be a useful tool for oyster comparative studies and to understand genome organization in different oyster taxa.|