title: A comparative study of G+C-rich satellite components of sheep and goat DNA.
abstract: 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 A1uI and Bg1II digests. Species-specific differences in the frequency, position and mode of distribution of secondary+ restriction target sites for EcoRI, Bg1II and A1uI 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.
mesh_terms: D000818:Animals; D002467:Cell Nucleus / Q000032:analysis; D003596:Cytosine / Q000032:analysis*; D004247:DNA; D004262:DNA Restriction Enzymes; D004276:DNA, Satellite; D006041:Goats; D006147:Guanine / Q000032:analysis*; D008099:Liver / Q000032:analysis; D009695:Nucleic Acid Renaturation; D012756:Sheep; D013045:Species Specificity
chemical_list: D004276:DNA, Satellite; D006147:Guanine; D003596:Cytosine; D004247:DNA; D004262:DNA Restriction Enzymes