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Article
Gibberellin A3 as an epigenetic determinant of global DNA hypo-methylation in tobacco
Gibberellins (GAs) are a large family of tetracyclic diterpenoids, controlling important aspects of growth and development throughout the plant life cycle. To explore the possibility that gibberellin A3 (GA3) sig...
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Article
Concerted evolution rapidly eliminates sequence variation in rDNA coding regions but not in intergenic spacers in Nicotiana tabacum allotetraploid
Nicotiana tabacum (tobacco) is a natural allotetraploid that formed from two diploid progenitors (N. sylvestris—S-genome, N. tomentosiformis—T-genome) within past 0.2 million years. Previ...
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Article
Silenced rRNA genes are activated and substitute for partially eliminated active homeologs in the recently formed allotetraploid, Tragopogon mirus (Asteraceae)
To study the relationship between uniparental rDNA (encoding 18S, 5.8S and 26S ribosomal RNA) silencing (nucleolar dominance) and rRNA gene dosage, we studied a recently emerged (within the last 80 years) allo...
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Article
Open AccessDancing together and separate again: gymnosperms exhibit frequent changes of fundamental 5S and 35S rRNA gene (rDNA) organisation
In higher eukaryotes, the 5S rRNA genes occur in tandem units and are arranged either separately (S-type arrangement) or linked to other repeated genes, in most cases to rDNA locus encoding 18S–5.8S–26S genes ...
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Article
Frequent silencing of rDNA loci on the univalent-forming genomes contrasts with their stable expression on the bivalent-forming genomes in polyploid dogroses (Rosa sect. Caninae)
The polyploid species in Rosa section Caninae (2n=21, 28 or 35) are characterized by an unusual reproductive system known as odd (or asymmetric) meiosis. Only two chromosome sets form bivalents in meiosis, wherea...
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Article
Distribution of 5-methylcytosine residues in 5S rRNA genes in Arabidopsis thaliana and Secale cereale
Bisulfite genomic sequencing was used to localise 5-methylcytosine residues (mC) in 5S rRNA genes of Arabidopsis thaliana and Secale cereale. The maps of mC distribution were compared with the previously publish...
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Article
Transposition of IS10 from the host Escherichia coli genome to a plasmid may lead to cloning artefacts
During recloning of Nicotiana tabacum L. repetitive sequence R8.3 in Escherichia coli, a modified clone that differed from the original by the insertion of an IS10 sequence was unintentionally produced. The inse...
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Article
Comparative analysis of DNA methylation in tobacco heterochromatic sequences
Cytosine methylation levels and susceptibility to drug-induced hypomethylation have been studied in several Nicotiana tabacum (tobacco) DNA repetitive sequences. It has been shown using HapII, MspI, BamHI and Sau...
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Article
Map** of 5-methylcytosine residues in Nicotiana tabacum 5S rRNA genes by genomic sequencing
Genomic sequencing was used to localise 5-methylcytosine residues in individual DNA strands of 5S rRNA genes in tobacco. The density of methylation along the sequence was high in both strands, exceeding the a...
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Article
Meiotic transmission of a hypomethylated repetitive DNA family in tobacco
We have recently shown that hypomethylation of cytosine residues in the HRS60 family of repetitive DNA sequences can be induced with 5-azacytidine (5-azaC) in tobacco tissue cultures. We have also proven that ...
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Article
Session 01 Cell structure and development
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Article
Immunological quantification of recA protein in cell extracts ofE. coli after exposure to chemical mutagens or UV radiation
Increased synthesis of RecA protein is induced inE. coli cells after their damage, the rate of synthesis being dependent on the extent of DNA alterations. The level of the RecA protein was determined inE. coli ce...
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Article
No significant correlation between specific antibodies to mouse mammary tumour virus and human cancer
To study the possible involvement of mouse mammary tumour virus (MMTV) related agent in human cancer we analysed 300 samples of human sera for the presence of antibodies to MMTV structural proteins. All sera w...