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Кандидат биологических наук


Старший научный сотрудник (Лаборатория структуры и функций генов человека)

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Избранные публикации

  1. Alekseenko I.V., Pleshkan V.V., Kopantzev E.P., Stukacheva E.A., Chernov I.P., Vinogradova T.V., Sverdlov E.D. (2012). Activity of the upstream component of tandem TERT/survivin promoters depends on features of the downstream component. PLoS ONE 7 (10), e46474 [+]

    We spliced the promoters of the human telomerase and human survivin genes (PhTERT and PhSurv, respectively) widely used for gene therapy and known to have the broadest cancer type spectrum of activity. Two head-to-tail constructs were obtained: the PhTERT-PhSurv and PhSurv-PhTERT tandems. The splicing caused quantitative and qualitative changes in the promoter features. In both constructs, only the promoter proximal to the transcribed gene retained its ability to initiate transcription, whereas the distal promoter was silent, the phenomenon never reported before. However, the distal promoter modulated the activity of the proximal one by increasing its strength and causing an appearance of additional transcription start sites. We suggested that this suppression might be due to the presence of Sp1 transcription factor binding sites in both promoters and Sp1-bridges between these sites. Such Sp1-bridges might convert the tandem promoter linear DNA into a stem-loop structure. If localized inside the formed loop, the distal promoter could lose its ability to initiate transcription. To test this hypothesis, we constructed two modified double promoters, where the proximal PhSurv promoter was replaced either by a shortened variant of the survivin promoter (PhSurv269) or by the mouse survivin promoter. Both PhSurv substitutes were considerably shorter than PhSurv and had different numbers and/or positions of Sp1 sites. In modified tandems, transcription was initiated from both promoters. We also prepared two mutant forms of the PhSurv-PhTERT tandem with two or four Sp1 sites removed from the distal "long" PhSurv promoter. In the first case, the distal PhSurv promoter remained silent, whereas the removal of four Sp1 binding sites restored its activity. In the majority of studied cancer cell lines the efficiency of transcription from the hTERT-(shortened hSurv269) promoter tandem was markedly higher than from each constituent promoter. In normal lung fibroblast cells, the tandem promoter activity was considerably lower.

    ID:2002
  2. Pavlyukov M.S., Antipova N.V., Balashova M.V., Vinogradova T.V., Kopantzev E.P., Shakhparonov M.I. (2011). Survivin monomer plays an essential role in apoptosis regulation. J. Biol. Chem. 286 (26), 23296–307 [+]

    Survivin was initially described as an inhibitor of apoptosis and attracted growing attention as one of the most tumor-specific genes in the human genome and a promising target for cancer therapy. Lately, it has been shown that survivin is a multifunctional protein that takes part in several crucial cell processes. At first, it was supposed that survivin functions only as a homodimer, but now data indicate that many processes require monomeric survivin. Moreover, recent studies reveal a special mechanism regulating the balance between monomeric and dimeric forms of the protein. In this paper we studied the mutant form of survivin that was unable to dimerize and investigated its role in apoptosis. We showed that survivin monomer interacts with Smac/DIABLO and X-linked inhibitor of apoptosis protein (XIAP) both in vitro and in vivo. Due to this feature, it protects cells from caspase-dependent apoptosis even more efficiently than the wild-type survivin. We also identified that mutant monomeric survivin prevents apoptosis-inducing factor release from the mitochondrial intermembrane space, protecting human fibrosarcoma HT1080 cells from caspase-independent apoptosis. On the other hand, our results indicate that only wild-type survivin, but not the monomer mutant form, enhances tubulin stability in cells. These findings suggest that survivin partly performs its functions as a monomer and partly as a dimer. The mechanism of dimer-monomer balance regulation may also work as a "switcher" between survivin functions and thereby explain remarkable functional diversities of this protein.

    ID:652
  3. Kopantzev E.P., Monastyrskaya G.S., Vinogradova T.V., Zinovyeva M.V., Kostina M.B., Filyukova O.B., Tonevitsky A.G., Sukhikh G.T., Sverdlov E.D. (2008). Differences in gene expression levels between early and later stages of human lung development are opposite to those between normal lung tissue and non-small lung cell carcinoma. Lung Cancer 62 (1), 23–34 [+]

    We, for the first time, directly compared gene expression profiles in human non-small cell lung carcinomas (NSCLCs) and in human fetal lung development. Previously reported correlations of gene expression profiles between lung cancer and lung development, deduced from matching data on mouse development and human cancer, have brought important information, but suffered from different timing of mouse and human gene expression during fetal development and fundamental differences in tumorigenesis in mice and humans. We used the suppression subtractive hybridization technique to subtract cDNAs prepared from human fetal lung samples at weeks 10-12 and 22-24 and obtained a cDNA library enriched in the transcripts more abundant at the later stage. cDNAs sequencing and RT-PCR analysis of RNAs from human fetal and adult lungs revealed 12 differentially transcribed genes: ADH1B, AQP1, FOLR1, SLC34A2, CAV1, INMT, TXNIP, TPM4, ICAM-1, HLA-DRA, EFNA1 and HLA-E. Most of these genes were found up-regulated in mice and rats at later stages than in human lung development. In surgical samples of NSCLC, these genes were down-regulated as compared to surrounding normal tissues and normal lungs, thus demonstrating opposite expression profiles for the genes up-regulated during fetal lung development.

    ID:4
  4. Illarionova A.E., Vinogradova T.V., Sverdlov E.D. (2007). Only those genes of the KIAA1245 gene subfamily that contain HERV(K) LTRs in their introns are transcriptionally active. Virology 358 (1), 39–47 [+]

    Insertion of LTRs into some genome locations might seriously affect regulation of the neighboring genes expression. This hypothesis is widely accepted but, however, not confirmed directly. Earlier, we have identified a family of closely related genes highly similar to the KIAA1245 mRNA counterpart. This family included a subfamily of genes some of which contained and the others lacked an LTR in their structure. We compared transcription of several closely related genes of the subfamily differing in the presence or absence of LTRs. Only LTR-containing genes were transcribed in transformed cell lines, tumorous and embryonic human tissues, whereas LTR-lacking genes remained silent. Since the genes were in the same intracellular microenvironment, we suggested that this effect was most probably due to intrinsic cis-characteristics of integrated LTRs and confirmed this by demonstrating high enhancer activity of KIAA1245 LTRs. The expression of the LTR-containing genes in embryonic tissues might suggest their involvement in evolutionary events during primate speciation.

    ID:6
  5. Kovalskaya E., Buzdin A., Gogvadze E., Vinogradova T., Sverdlov E. (2006). Functional human endogenous retroviral LTR transcription start sites are located between the R and U5 regions. Virology 346 (2), 373–8 [+]

    Human endogenous retroviruses (HERVs) occupy about 5% of human DNA and are thought to be remnants of ancient retroviral infections of human ancestors' germ cells. HERVs can modify expression of host cell genes through their cis-regulatory elements concentrated in their long terminal repeats (LTRs). Although numerous HERV-related RNAs were identified in the human transcriptome, for most of them, it remains unclear whether they are LTR-promoted or read-through products initiated from neighboring genomic promoters. Here, we describe mapping of transcriptional start sites within solitary and proviral LTRs of the HERV-K (HML-2) human-specific subfamily of endogenous retroviruses. Surprisingly, the transcription was initiated predominantly from the very 3' termini of the LTR R regions. The data presented here may shed light on adaptive coevolution of human endogenous retroviruses with their host cells.

    ID:7
  6. Buzdin A., Gogvadze E., Kovalskaya E., Volchkov P., Ustyugova S., Illarionova A., Fushan A., Vinogradova T., Sverdlov E. (2003). The human genome contains many types of chimeric retrogenes generated through in vivo RNA recombination. Nucleic Acids Res. 31 (15), 4385–90 [+]

    В статье сообщается об открытии группы ретроэлементов, сформированных по принципиально новому механизму: при помощи смены матриц в ходе обратной транскрипции РНК ретроэлементов LINE млекопитающих.

    ID:20
  7. Buzdin A., Khodosevich K., Mamedov I., Vinogradova T., Lebedev Y., Hunsmann G., Sverdlov E. (2002). A technique for genome-wide identification of differences in the interspersed repeats integrations between closely related genomes and its application to detection of human-specific integrations of HERV-K LTRs. Genomics 79 (3), 413–22 [+]

    В статье опубликован новый метод, позволяющий сравнивать распределение геномных повторов между близкородственными геномами при помощи метода вычитающей гибридизации

    ID:17
  8. Lebedev Y.B., Belonovitch O.S., Zybrova N.V., Khil P.P., Kurdyukov S.G., Vinogradova T.V., Hunsmann G., Sverdlov E.D. (2000). Differences in HERV-K LTR insertions in orthologous loci of humans and great apes. Gene 247 (1-2), 265–77 [+]

    Впервые предложена техника селективной ПЦР-амплификации участков интеграции ретроэлементов. По результатам сравнительно-сруктурного и эволюционного анализа LTR-элементов разработана детальная систематика эндогенных ретровирусов семейства К (HERV-K) и показано существование волн ретропозиций HERV-K в эволюции генома, совпадающих по времени со временем дивергенции основных линий приматов. Доказано существование специфичной для генома человека группы LTR-элементов

    ID:98