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Characterization of charr chromosomes using fluorescence in situ hybridization

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Ecology, behaviour and conservation of the charrs, genus Salvelinus

Synopsis

The chromosomal locations of several families of tandem repetitive DNA sequences and the 5S rDNA were determined using fluorescence in situ hybridization (FISH) in the five North American charr species: Salvelinus namaycush, S. fontinalis, S. alpinus, S. malma, and S. confluentus. The pattern of hybridization of three centromeric repetitive sequences previously isolated from S. namaycush and S. alpinus was unique in each species. Dual-color FISH experiments showed that in several species many of the centromeres had the EcoRI-DraI family in addition to either the AluI-RsaI type A or type B families. The EcoRI-DraI family which was found only at the centromeres of acrocentric chromosomes in S. namaycush, S. fontinalis and S. malma was also found at centromeres of selected metacentrics in S. alpinus (one pair) and S. confluentus (four pairs) whose chromosomes have undergone additional centric fusions compared to the other species. The locations of 5S rDNA sequences were different in each species except for the two most closely related (S. alpinus and S. malma). Two whole-arm chromosome paint probes, one specific for the short and the other for the long arm of the lake charr sex chromosomes, hybridize to the same chromosome pair in all species. Results with other paint probes suggest that independent centric fusions have occurred in S. alpinus and S. confluentus which is consistent with the phylogenetic tree obtained previously for Salvelinus with cytogenetic and DNA data.

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Pierre Magnan Céline Audet Hélène Glémet Michel Legault Marco A. Rodríguez Eric B. Taylor

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© 2002 Springer Science+Business Media Dordrecht

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Phillips, R.B., Matsuoka, M.P., Reed, K.M. (2002). Characterization of charr chromosomes using fluorescence in situ hybridization. In: Magnan, P., Audet, C., Glémet, H., Legault, M., Rodríguez, M.A., Taylor, E.B. (eds) Ecology, behaviour and conservation of the charrs, genus Salvelinus . Developments in environmental biology of fishes, vol 22. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-1352-8_20

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  • DOI: https://doi.org/10.1007/978-94-017-1352-8_20

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-90-481-6088-4

  • Online ISBN: 978-94-017-1352-8

  • eBook Packages: Springer Book Archive

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