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Biomedical subjects

V Z Tarantul

Publications and source records attributed to V Z Tarantul.

At least 73 records · Page 4Linked to original sources
PubMedDate not supplied

[Introduction of the human recombinant angiogenin at the early stages of postnatal development inhibits the growth of mice].

We studied the influence of recombinant DNA containing the cloned angiogenin gene, plasmid DNA without angiogenin gene, and purified recombinant angiogenin injected to Tg8 mice at the age of two days on the body mass of 28- and 40-day old mice. The body mass of mice that were injected with the cloned angiogenin gene or purified angiogenin was less than in the control mice. The body mice of Tg8 mice injected with recombinant DNA containing the cloned angiogenin gene did not increase from day 2 to day 40, while in the mice with purified recombinant angiogenin and control mice it increased by 24 and 57%, respectively. These data suggest that the elevated level of angiogenin at the early developmental stages inhibits the increase of body mass. The effect we described as related, in al likelihood, to the known inhibitory effect of angiogenin on protein synthesis.

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[Influence of regulatory genes of type 1 human immunodeficiency virus on proliferation and differentiation of murine embryonic stem cells].

Spontaneous formation of embryoid bodies and subsequent differentiation of some cells into cardiomyocytes were demonstrated on murine embryonic stem cells of R1 line. The lines of embryonic stem cells were obtained that had been transfected with genetic constructs carrying expressing regulatory genes of the human immunodeficiency virus tat and nef and "green protein" gene (GFP). The transfection of embryonic stem cells with the gene tat stimulated their proliferative activity, while this activity decreased in the cells transfected with the gene nef. The time necessary for the formation of embryoid bodies by all lines of transfected cells was similar to that in the control cells. In the cultures of cells transfected with nef and tat, the number of embryoid bodies and the percentage of embryoid bodies with contracting cardiomyocytes were higher and lower than in the control, respectively. Thus, an inverse correlation was observed between the effects of regulatory genes of the human immunodeficiency virus on proliferation and differentiation embryonic stem cells.

Animals↗
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[Viral promoter-enhancer element inhibits replication of autonomously replicating plasmid in mammalian cells].

To study the autonomous replication of constructs combining replication and transcription elements, hybrid plasmids were designed to contain both higher eukaryotic ori/ARS and the cytomegalovirus (CMV) promoter-enhancer. In pCI.ARS-neo, ARS was from autonomously replicating stable transgene pr8a of silkworm Bombyx mori. In pCI.ori-neo, chromosomal ori was from the human c-myc locus. Analysis of the maintenance of pCI.ARS-neo and pCI.ori-neo in transgenic mice and in cultured immortalized human T cells revealed the interplay of transcription and replication, as the CMV element suppressed autonomous replication of both plasmids. This might reflect the conflict between transcription and replication of the genome in higher eukaryotic cells.

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[Analysis of expression of a series of lymphoma-specific genes in human fibroblasts immortalized by SV40 virus].

Subtraction hybridization was earlier used to obtain cDNA clones corresponding to human genes upregulated in HIV-associated centroblast lymphoma (CL) as compared with HIV-associated immunoblast lymphoma (IL). With inverse subtraction hybridization, clones were isolated that correspond to genes upregulated in IL compared with CL. In addition to cDNAs characterized earlier, the resulting clones contained several (seven CL-specific and three IL-specific) sequences with unknown functions. To identify the lymphoma-specific genes that are overexpressed in early carcinogenesis, Northern blotting was used to assess the level of gene transcription in two human fibroblast lines and in their derivatives immortalized with either a temperature-sensitive mutant of SV-40 or with pSV3neo carrying the SV-40 A gene, considering the latter as a model of early cell malignant transformation. Increased expression in at least one immortalized line compared with normal fibroblasts was observed for set, a-myb, ND1, ND2, ND4 (NADH dehydrogenase subunits 1, 2, and 4), COX2, COX3 (cytochrome-c-oxidase subunits 2 and 3), KIAA0129, and the gene corresponding to cDNA hss2-1-7-10. High expression of these genes was assumed to be associated not only with lymphomogenesis, but also with early transformation (immortalization) of other, nonlymphoid cells. Expression of the calpain gene and the gene corresponding to cDNA hss2-2-9-5 proved to be lower in immortalized than in normal fibroblasts. This was considered indicative of an alternative mechanism of fibroblast transformation or of different processes regulating the expression of these genes in early and late carcinogenesis.

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[The structure of PstI-repeats adjacent to the growth hormone gene and transcription of the family of PstI-repeats in various bovine organs].

Previously cloned PstI-repeats located in 5'- and 3'-flanking sequences of the bovine growth hormone gene were studied in details. The size of the repeats (1,200-2,000 b.p.), the degree of homology, the orientation and direction of their transcription were determined. They were shown to be transcribed in thymus, liver, kidneys, pancreas, adenohypophysis, spleen, although with different efficiency. The transcripts are polyadenylated and heterogeneous in size. Partial asymmetry of PstI-repeat family transcription was shown.

Animals↗
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[Characteristic of segments of transgenic animal genomes, adjacent to integrated sequences of foreign DNA].

DNAs of seven transgenic mice and one transgenic rabbit was divided into fractions according to reassociation kinetics and GC-content. Moderate and/or frequent (reverse) repeated sequences of the genome were revealed in all cases next to different transgenes. DNA fractions containing foreign sequences differed by the GC-content in different transgenic animals.

Animals↗
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[Characteristics of a frequently repetitive sequence family in the bull genome].

The repeated sequences situated in 5'- and 3'-flanking regions of the bovine growth hormone gene were cloned and characterized. It was shown that they are related to a described before PstI-family of bovine repeats with a frequency of repetition about 10(5). PstI-repeats are found only in genomes of sheep and goats subfamily (Carpinae) and not found in DNA of other analysed vertebrate species. Repeats of this family are situated in the genome as a number of dispersed clusters, they have conservative structure and are alike by the frequency of repetition in the DNA of all organisms that contain them. The presence of sequences homologous to PstI-repeats are shown in bovine pituitary poly(A)+ cytoplasmic RNA by means of North-hybridization.

Animals↗
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[Molecular and cytologic analysis of clusters of moderate repeats of bird genomes].

Pigeon genome long sequences containing clusters of moderately repeating elements have been cloned. Molecular analysis has shown a dispersed distribution of the repeats in both pigeon and chicken genomes. Within a single cluster, a scrambled distribution of elements belonging to different families of repeats has been shown. Similar repeated sequences have been revealed within clusters. The analysed clusters of repeats are characterized by a limited structural variability in the genomes. In situ hybridization revealed the localization of sequences complementary to the cloned clusters in pigeon and chicken macrochromosomes. Preferential localization has been demonstrated in telomeric and centromeric chromosome regions as well as in the region of R-bands.

Animals↗
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[Structural features of the integration site of foreign DNA in the transgenic mouse genome].

The structure of the transgenic mouse DNA region containing an integrated transgene (fragment of pBR322 sequence) was analysed. In one of the sequences flanking the transgene, short direct and inverted overlapping repeats were revealed at a distance of 60 bp from the integration site. In the same flanking sequence, there is an extended sequence (3.5 kbp) 0.3-1 kbp away from the transgene. It repeats 100-300 times in the mouse genome and is highly conservative (the homologs of the repeat have been revealed in other mammalian, bird, fish and insect genomes). This up-to-date unknown family of highly-conserved dispersed repeats has been denoted by T1. We believe that both the revealed short inverted repeats capable of forming hairpins with loops and the T1 repeat are structures involved in the process of non-homologous insertion of foreign DNA into the region of the transgenic mouse genome.

Animals↗
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[Introduction of DNA sequences of Rous sarcoma virus into Drosophila and mouse genomes by microinjections into ova].

The paper covers experimental results of introducing exogenic genetic material, namely DNA sequences of the Rous sarcoma virus, by microinjections in mice zygotes and Drosophila early embryos. In a number of cases integration of viral DNA into genomes of these organisms was detected. Blot-hybridizations analysis of cell DNA proved that the inserted viral sequences undergo rearrangements in the course of integration.

Animals↗
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[Elements of the genome regulating structural gene transcription in eukaryotes].

A constant fine regulation of gene expression is needed for the normal development to proceed and for the physiological homeostasis to be maintained. In many cases such a regulation in eukaryotes is realized at the level of transcription, involving various cis- and trans-regulatory genomic elements. The review provides the data on the structure of elements determining the level of gene transcription in response to the action of various environmental factors and effectors, responsible for coordinated expression of the genes which provide for tissue-specific transcription and self-regulation of gene transcription. The data were considered on regulation of gene activity by mobile genetic elements and a relationship between the mechanisms of regulation of gene expression and evolution has been formulated.

Animals↗
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[Cloning of the DNA fragment of a transgenic mouse containing an integrated recombinant plasmid].

The "plasmid rescue" method has been used to isolate the recombinant plasmid pMA3 fragment and flanking sequences from the transgenic mouse genome containing the fragment in integrated form. The "rescued" plasmid, pMAR1, lacks all virus sequences and retains only those regions of pBR322 that are responsible for the plasmid replication and Escherichia coli ampicillin resistance. The plasmid pMA3 deletion has occurred at its integration into the mouse genome after microinjection into the zygote. The integrated fragment of the plasmid is adjacent to the genome repeated sequence that is highly conservative in evolution.

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