title: Are there insertions in the ribosomal DNA of vertebrates?
abstract: We have analysed the Eco RI restriction pattern of rDNA of the newt Triturus vulgaris and of some other amphibian species by Southern blotting and hybridization with nick-translated Xenopus rDNA prepared from the recombinant plasmids pXlr11 and pXlr12 (21). After hybridization with r11, the 28S coding fragments become visible in two bands, a prominent one of 5.3 kb and a weak band of 5.9 kb representing about 8% of the 28S genes. The evidence obtained so far by additional digestions with Bam HI and Bgl II indicates that in this species and in Triturus helveticus the coding regions of the 5.9 kb fragments are interrupted by an insertion 0.6 kb in length located in a 1.6 kb Bgl II fragment at the 3' end of the Eco RI fragment, which we believe to be the first described in a vertebrate.
authors.forename: K
authors.initials: K
authors.lastname: Lohmann
authors.forename: K
authors.initials: K
authors.lastname: Kraus
mesh_terms: D000818:Animals; D001426:Bacterial Proteins; D004262:DNA Restriction Enzymes / Q000378:metabolism; D004251:DNA Transposable Elements; D004275:DNA, Ribosomal / Q000032:analysis*; D015245:Deoxyribonuclease BamHI; D015246:Deoxyribonuclease EcoRI; D015252:Deoxyribonucleases, Type II Site-Specific; D009693:Nucleic Acid Hybridization; D012091:Repetitive Sequences, Nucleic Acid; D013045:Species Specificity; D014562:Caudata / Q000235:genetics; D014982:Xenopus laevis / Q000235:genetics
chemical_list: D001426:Bacterial Proteins; D004251:DNA Transposable Elements; D004275:DNA, Ribosomal; D004262:DNA Restriction Enzymes; D015245:Deoxyribonuclease BamHI; D015246:Deoxyribonuclease EcoRI; C024404:BglII endonuclease; D015252:Deoxyribonucleases, Type II Site-Specific