Publications by authors named "V G Levitsky"
Transcription factors (TFs) are the main regulators of eukaryotic gene expression. The cooperative binding of at least two TFs to genomic DNA is a major mechanism of transcription regulation. Massive analysis of the co-occurrence of overrepresented pairs of motifs for different target TFs studied in ChIP-seq experiments can clarify the mechanisms of TF cooperation.
View Article and Find Full Text PDFThe auxin signaling molecule regulates a range of plant growth and developmental processes. The core transcriptional machinery responsible for auxin-mediated responses is conserved across all land plants. Genetic, physiological and molecular exploration in bryophyte and angiosperm model species have shown both qualitative and quantitative differences in auxin responses.
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- - Efficient motif discovery from ChIP-seq data relies heavily on selecting the right background nucleotide sequences, influencing the identification of target transcription factors and minimizing false positives from common motifs like simple sequence repeats.
- - A comparison of two methods for generating background sequences—synthetic (shuffling nucleotides) and genomic (selecting from the reference genome)—showed that the genomic approach yielded better results in detecting known motifs and reducing non-specific motifs.
- - The study implemented a web service called AntiNoise to facilitate the extraction of genomic background sequences for various eukaryotic genomes, proving particularly effective for plants when compared to mammals.
We developed a procedure for locating genes on polytene chromosomes and described three types of chromosome structures (gray bands, black bands, and interbands), which differed markedly in morphological and genetic properties. This was reached through the use of our original methods of molecular and genetic analysis, electron microscopy, and bioinformatics data processing. Analysis of the genome-wide distribution of these properties led us to a bioinformatics model of the genome organization, in which the genome was divided into two groups of genes.
View Article and Find Full Text PDFBackground: Intratumoral injection of oncolytic viruses (OVs) shows promise in immunotherapy: ONCOS-102, a genetically engineered OV that encodes Granulocyte-Macrophage Colony-Stimulating Factor (GM-CSF) demonstrated efficacy in early clinical trials, enhancing T cell infiltration in tumors. This suggests OVs may boost various forms of immunotherapy, including tumor-specific bi-specific antibodies (BsAbs).
Methods: Our study investigated in vitro, how ONCOS-204, a variant of ONCOS-virus expressing the ligand of inducible T-cell co-stimulator (ICOSL), modulates the process of T cell activation induced by a BsAb.