Results 161 to 170 of about 523,839 (210)
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Ribosomal DNA of Caenorhabditis elegans
Journal of Molecular Biology, 1981Abstract We have characterized the organization of the genes coding for 18 S, 5·8 S and 26 S ribosomal RNAs in the nematode Caenorhabditis elegans . These ribosomal genes, present in about 55 copies per haploid genome, alternate in a repeating tandem array.
J G, Files, D, Hirsh
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Nature, 1969
THE amount of DNA complementary to ribosomal RNA (rDNA) has been shown to be constant in several tissues varying in rRNA synthesis1,2. There is, however, a dramatic exception to this in amphibian and insect oocytes3–5, where amplification of the rDNA occurs and results in high rates of rRNA synthesis during oogenesis6.
J, Mohan, A, Dunn, L, Casola
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THE amount of DNA complementary to ribosomal RNA (rDNA) has been shown to be constant in several tissues varying in rRNA synthesis1,2. There is, however, a dramatic exception to this in amphibian and insect oocytes3–5, where amplification of the rDNA occurs and results in high rates of rRNA synthesis during oogenesis6.
J, Mohan, A, Dunn, L, Casola
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Non-canonical DNA structures in the human ribosomal DNA
Histochemistry and Cell Biology, 2023Non-canonical structures (NCS) refer to the various forms of DNA that differ from the B-conformation described by Watson and Crick. It has been found that these structures are usual components of the genome, actively participating in its essential functions.
Evgeny, Smirnov +4 more
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Circular ribosomal DNA during ribosomal magnification in Drosophila melanogaster
Journal of Molecular Biology, 1977DNA from excised testes of Drosophila melanogaster males undergoing ribosomal DNA magnification shows two peaks on an ethidium bromide/CsCl density gradient: a minor peak that bands to a density of 1·570 g/cm3 and a main peak corresponding to 1·540 g/cm3 density.
F. GRAZIANI +2 more
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Structure and organization of ribosomal DNA
Biochimie, 1991Three trends are seen in the organization of ribosomal DNA genes during evolution: 1) gradual separation and separability of the regulation of transcription of 5S and larger subunit rRNAs; 2) retention of a transcription unit containing both large and small rRNAs; and 3) clustering of genes for both 5S and 18S-28S rDNAs, with the possible association ...
A K, Srivastava, D, Schlessinger
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Ribosomal DNA and Neurological Disorders
Current Molecular MedicineRibosomal DNA (rDNA) is important in the nucleolus and nuclear organization of human cells. Defective rDNA repeat maintenance has been reported to be closely associated with neurological disorders, such as Alzheimer’s disease, Huntington’s disease, Parkinson’s disease, amyotrophic lateral sclerosis, frontotemporal dementia, depression, suicide, etc ...
Hong Zhou +6 more
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The Ribosomal DNA Plasmids of Entamoeba
Parasitology Today, 1998In most organisms, the nuclear ribosomal RNA (rRNA) genes are highly repetitive and arranged as tandem repeats on one or more chromosomes. In Entamoeba, however, these genes are located almost exclusively on extrachromosomal circular DNA molecules with no clear evidence so far of a chromosomal copy.
S, Bhattacharya, I, Som, A, Bhattacharya
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Nontranscribed spacers in Drosophila ribosomal DNA
Chromosoma, 1981Ribosomal DNA nontranscribed spacers in Drosophila virilis DNA have been examined in some detail by restriction site analysis of cloned segments of rDNA, nucleic acid hybridizations involving unfractionated rDNA, and base composition estimates. The overall G + C content of the spacer is 27--28%; this compares with 39% for rDNA as a whole, 40% for main ...
P M, Rae, T, Barnett, V L, Murtif
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Ribosomal DNA instability and genome adaptability
Chromosome Research, 2019Ribosomes are large, multi-subunit ribonucleoprotein complexes, essential for protein synthesis. To meet the high cellular demand for ribosomes, all eukaryotes have numerous copies of ribosomal DNA (rDNA) genes that encode ribosomal RNA (rRNA), usually far in excess of the requirement for ribosome biogenesis.
Devika, Salim, Jennifer L, Gerton
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Chromatin states at ribosomal DNA loci
Biochimica et Biophysica Acta (BBA) - Gene Regulatory Mechanisms, 2013Eukaryotic transcription of ribosomal RNAs (rRNAs) by RNA polymerase I can account for more than half of the total cellular transcripts depending on organism and growth condition. To support this level of expression, eukaryotic rRNA genes are present in multiple copies.
Stephan, Hamperl +5 more
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