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Nucleic Acids Research, 1979, Vol. 6, No. 1 57-70
© 1979

Articles

A comparative study of G+C-rich satellite components of sheep and goat DNA

J. Forstovaá, H. Votavovaá, T. Guttmann, L. Pivec and J. Doskoc{caron}il

Institute of Molecular Genetics, Institute of Organic Chemistry and Biochemistry, Czechoslovak Academy of Sciences Flemingovo n. 2, 166 10 Praha 6, Czechoslovakia

Received November 13, 1978. Restriction fragment patterns of G+C-rich satellites of sheep and goat DNA were compared. The 1.712 g/cm3 satellites of both species appear homologous, consisting of repeats 760 base pairs long and showing coincidence of position of primary+ EcoRI, BamHI and most BspRI restriction target sites. The EcoRI and BamHI endonucleases produce mostly monomers of the repeating unit, while oligomers prevail in the AluI and BglII digests. Species-specific differences in the frequency, position and mode of distribution of secondary+ restriction target sites for EcoRI, BglII and AluI were observed. Unlike the 1.712 g/cm3 satellites, the 1.723 g/cm3 component of sheep DNA and the 1.719 g/cm3 material from goat DNA appear species-specific, since no homologous material could ever be detected in the DNA of the other species.


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