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The Influence of the Minor Short Isoform of Securin (PTTG1) on Transcription is Significantly Different from the Impact of the Full Isoform

  • GENOMICS. TRANSCRIPTOMICS
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Abstract

PTTG1 (vertebrate securin) is a separation inhibitor and regulates DNA repair and transcription. The protein is predominantly expressed in the second half of the S phase and at the G2 stage. With the onset of anaphase, securin is ubiquitinated by the APC/C complex and degraded rapidly. Increased expression of PTTG1 is associated with enhanced tumor cell growth and metastasis. Recently, we found a short securin isoform lacking the main APC/C recognition site (D-box) and the DNA-binding domain encoded by exons 3 and 4. The mRNA level of the short isoform in unsynchronized cells is 0.4–2% of the full-length one. We reported earlier on the ability of the short PTTG1 isoform to activate some of the genes controlled by the full-length protein. In this work, groups of genes, whose expression is altered by the action of the short and complete securin isoforms, were determined using RNA sequencing. Groups of genes whose mRNA levels are regulated by both protein isoforms and only one of the isoforms were identified. For a more detailed study of the effect of securin isoforms on the transcriptional program of cells, the NFYB gene, encoding the NF-Y transcription regulator subunit, was chosen. Our data showed that with overexpression of the short isoform, the level of NFYB mRNA decreased 2.4 ± 0.7 times, while the complete isoform did not significantly affect the expression of NFYB. 2.2-fold suppression of the short isoform of securin led to an increase in the expression of NFYB mRNA by 2.7 ± 0.3 times. Moreover, the mRNA expression of full-length securin increased by 2.7 ± 0.4 times. Since NFYB is associated with the PTTG1 promoter region, we suggest that the short isoform may be involved in regulation of the expression of the main isoform of securin by changing the level of this transcription factor. Since NFYB and PTTG1 are involved in the development of tumors and the formation of drug resistance, we assume that the short isoform of securin may play an important role in these processes. Thus, we showed the functional significance of the minor short isoform of securin.

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Funding

The study was carried out with financial support from the Russian Foundation for Basic Research under scientific project no. 18-34-00628 mol_a.

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Authors and Affiliations

  1. Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, 119991, Moscow, Russia

    D. E. Demin, A. N. Uvarova & A. M. Schwartz

  2. Moscow Institute of Physics and Technology, 141701, Dolgoprudny, Moscow oblast, Russia

    D. E. Demin & A. M. Schwartz

  3. Faculty of Biology, Lomonosov Moscow State University, 119234, Moscow, Russia

    A. N. Uvarova

  4. Kharkevich Institute for Information Transmission Problems, Russian Academy of Science, 127051, Moscow, Russia

    A. V. Klepikova

  5. Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 119992, Moscow, Russia

    A. V. Klepikova

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  1. D. E. Demin
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Correspondence to D. E. Demin.

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The study did not use biological materials obtained from humans or animals.

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Abbreviations: PTTG1, Pituitary Tumor-Transforming Gene-1; APC/C, Anaphase Promoting Complex/Cyclosome; NFYB, Nuclear Transcription Factor Y Subunit Beta.

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Demin, D.E., Uvarova, A.N., Klepikova, A.V. et al. The Influence of the Minor Short Isoform of Securin (PTTG1) on Transcription is Significantly Different from the Impact of the Full Isoform. Mol Biol 54, 43–50 (2020). https://doi.org/10.1134/S0026893320010045

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