Isolation and mapping of the rRNA genes in the macronucleus of Oxytricha fallax
- 1 February 1980
- journal article
- research article
- Published by Springer Science and Business Media LLC in Chromosoma
- Vol. 77 (2), 193-202
- https://doi.org/10.1007/bf00329544
Abstract
The DNA in the macronucleus of the protozoan Oxytricha, unlike like that of typical eukaryotes, exists as short, gene-sized molecules. Within the macronucleus the rRNA genes are contained in molecules 7,380 nucleotide pairs in length. This rDNA has been substanially purified by selective denaturation of non-ribosomal DNA followed by Sl nuclease digestion. Results from restriction nuclease digestion and rRNA:DNA hybridization show that the rDNA is a linear, non-palindromic molecule which contains one gene each for the 19s and 25s rRNAs. A total of less than 600 base pairs of DNA lies between the 19s and 25s genes or at the 3′ end of the 25s gene. The non-coding portion of the ribosomal DNA is almost entirely limited to an approximately 1,400 base pair region at the 5′ end of the molecule.Keywords
This publication has 24 references indexed in Scilit:
- An intervening sequence in the gene coding for 25S Ribosomal RNA of Tetrahymena pigmentosaCell, 1979
- Nucleotide sequence of xenopus borealis oocyte 5S DNA: Comparison of sequences that flank several related eucaryotic genesCell, 1978
- A single integrated gene for ribosomal RNA in a eucaryote, tetrahymena pyriformisCell, 1977
- Restriction analysis of the nontranscribed spacers of Xenopus laevis ribosomal DNACell, 1977
- R loop mapping of the 18S and 28S sequences in the long and short repeating units of drosophila melanogaster rDNACell, 1977
- Structure of ribosomal DNA in Physarum polycephalumJournal of Molecular Biology, 1976
- The 5′→3′ polarity of the xenopus ribosomal RNA precursor moleculeCell, 1976
- Free ribosomal DNA molecules from Tetrahymena pyriformis GL are giant palindromesJournal of Molecular Biology, 1976
- The macronuclear ribosomal DNA of Tetrahymena pyriformis is a palindromeJournal of Molecular Biology, 1976
- Detection of specific sequences among DNA fragments separated by gel electrophoresisJournal of Molecular Biology, 1975