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• W4210588294 endingPage "673" @default.
• W4210588294 startingPage "666" @default.
• W4210588294 abstract "Analysis of scientific literature data has revealed several ways in which retrotransposons, when activated, are involved in carcinogenesis. First, retroelements can encode oncogenic proteins. For example, the Np9 protein is translated from HERV-K endogenous retrovirus transcript. Second, retroelements are used as alternative promoters of protooncogenes. Accordingly, their activation contributes to the enhanced expression of oncogenes (e.g. CSF1R, IRF5, MET, RAB3IP, CHRM3). Third, retroelements are located in the introns of some genes, and upon their activation, they form chimeric transcripts, such as LTR2-FABP7, LTR-ALK, LTR-ERBB4, LINE1-MET, which have pronounced oncogenic activity. Fourth, retroelements are transposed into tumor suppressor genes (e.g. APC, NF1, MSH2, PTEN, RB1, TSC2, STK11, VHL) and inactivate them, which is associated with the presence of hot spots of insertional mutagenesis in them. As a result, the growth of tumors and the survival of their cells are stimulated. It is important to note that protein products of tumor suppressor genes, such as TP53, RB1, VHL, BRCA1, ATM, are characterized by the ability to inhibit the activity of retroelements. Accordingly, when even one oncosuppressive gene is inactivated, a kind of vicious circle can be triggered when the control of expression of retroelements is weakened. The latter, in turn, inactivate other tumor suppressors containing hot spots of insertional mutagenesis. This stimulates new pathways of carcinogenesis and the production of oncogenes associated with transposons. Thus, it is possible to explain in a new way the mechanisms of tumor formation in hereditary tumor syndromes. This is due to the fact that the weakening of the function of an oncosuppressor in a germinal heterozygous mutation may be sufficient to trigger a vicious circle involving retroelements, oncogenes and other oncosuppressors. Similar mechanisms are likely for sporadic malignant tumors. However, the initiating event in them can be the direct activation of transposons under the influence of stressors, chemical and physical carcinogens. In addition to the events described, activation of retroelements causes genomic instability, which contributes to complex genomic rearrangements often observed in malignant tumors. MicroRNAs and long noncoding RNAs, the sources of which are retroelements, also play an important role in the evolution of tumors. Their study is promising for the development of targeted therapy for neoplasms." @default.
• W4210588294 created "2022-02-08" @default.
• W4210588294 creator A5009918132 @default.
• W4210588294 date "2021-12-15" @default.
• W4210588294 modified "2023-09-30" @default.
• W4210588294 title "Influence of retroelements on oncogenes and tumor suppressors in carcinogenesis: A review" @default.
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