Abstract
DNA hypermethylation and mutations are key mechanisms for the downregulation of tumor suppressor genes. NotI-microarrays allowed us to detect hypermethylation and/or deletions in 180 NotI sites associated with 188 genes of human chromosome 3, in 24 paired (tumor/normal) colon samples. The most frequent aberrations (in more than 20% of tumor samples) were detected in the promoter regions of 20 genes. Expression and promoter methylation of these genes were analyzed using the data for paired colon samples from The Cancer Genome Atlas project. Three genes—ALDH1L1, PLCL2, and PPP2R3A—revealed a more than two-fold average decrease in expression and a negative correlation between mRNA level and promoter hypermethylation. The expression of these three genes was then evaluated in 30 paired colon samples by quantitative PCR. Frequent (in more than 60% of cases) and significant (5–9-fold on average) mRNA level decrease was found for each of the genes in the tumor samples. The results indicate a suppressor role of the ALDH1L1, PLCL2, and PPP2R3A genes in colon cancer, as well as functional significance of hypermethylation in the downregulation of these genes.
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ACKNOWLEDGMENTS
Assessment of gene expression by the quantitative PCR was performed using the equipment of EIMB RAS “Genome” center (http://www.eimb.ru/ru1/ckp/ccu_genome_c.php).
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This work was financially supported by the Russian Science Foundation (grant 17-74-20064).
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All procedures performed in this work comply with the ethical standards of the institutional committee for research ethics and the 1964 Helsinki Declaration and its subsequent changes, or comparable ethical standards.
Conflict of interests. The authors declare no conflict of interest.
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Translated by P. Vikhreva
Abbreviations: CC, colon cancer; CIN, chromosome instability; MSI, microsatellite instability; CIMP, CpG island methylator phenotype.
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Dmitriev, A.A., Beniaminov, A.D., Melnikova, N.V. et al. Functional Hypermethylation of ALDH1L1, PLCL2, and PPP2R3A in Colon Cancer. Mol Biol 54, 178–184 (2020). https://doi.org/10.1134/S0026893320010057
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DOI: https://doi.org/10.1134/S0026893320010057