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Isolation and characterization of salmonid telomeric and centromeric satellite DNA sequences

Isolation and characterization of salmonid telomeric and centromeric satellite DNA sequences

Genetica 131(2): 157-166

ISSN/ISBN: 0016-6707

PMID: 17180439

DOI: 10.1007/s10709-006-9126-1

Satellite DNA clones with a 37 bp repeat unit were obtained from BglII-digested genomic DNA of Masu salmon (Oncorhynchus masou) and Chum salmon (O. keta). Fluorescence in situ hybridization (FISH) analysis with the isolated clones as a probe showed that these repetitive sequences were localized in the telomeric regions of chromosomes in both species. Southern and dot blot analyses suggested conservation of homologous sequences with similar repeat unit in other salmonids including the species of the genus Oncorhynchus and Salvelinus, but lack or scarcity of such sequences in the genus Hucho and Salmo. Similarly, polymerase chain reaction (PCR)-based cloning of satellite DNA referring to a reported Rainbow trout (O. mykiss) centromeric sequence was successful for the Oncorhynchus, Salvelinus and Hucho species. The obtained satellite DNA clones were localized with FISH in the centromeric regions of chromosomes of the species from these three genera. Although PCR cloning of the centromeric satellite DNA had failed in the Salmo species due to some base changes in the priming sites, dot blot hybridization analysis suggested conservation of homologous satellite DNA in the genus Salmo as in the other three genera. In the neighbor-joining tree of cloned centromeric satellite DNA sequences, the genus Oncorhynchus and Salvelinus formed adjacent clades, and the clade of the genus Hucho included the reported centromeric sequence of the genus Salmo. Conservation pattern and molecular phylogeny of the telomeric and centromeric satellite DNA sequences isolated herein support a close phylogenetic relationship between the genus Oncorhynchus and Salvelinus and between the Salmo and Hucho.

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Accession: 016206596

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