• Carlos Rogelio Alvizo-Rodriguez, Maria de la Luz Ayala-Madrigal, Jesus Arturo Hernandez-Sandoval, Helen Haydee Fernanda Ramirez-Plascencia, Christian Octavio Gonzalez-Villaseñor, Nelly Margarita Macias-Gomez, Jorge Peregrina-Sandoval, Jose Miguel Moreno-Ortiz, Jesus A Valenzuela-Perez, Jose Alfonso Cruz-Ramos, and Melva Gutierrez-Angulo.
• Doctorado en Genética Humana, Departamento de Biología Molecular y Genómica, Centro Universitario de Ciencias de la Salud, Universidad de Guadalajara, Guadalajara, Jalisco, Mexico.
• J. Investig. Med. 2020 Mar 1; 68 (3): 782-785.

AbstractThe present study aimed to analyze the methylation pattern of the MIR200 family in the colorectal tissues and peripheral blood of colorectal cancer (CRC) patients. Previous informed consent, 102 samples of colorectal tissues (tumor and adjacent normal tissues) and 40 peripheral blood samples were collected from CRC patients. Additionally, we included a reference group of 40 blood samples. DNA extraction was done for colorectal tissues and peripheral blood. For methylation-specific PCR, we used bisulfite-treated DNA and controls for methylated and unmethylated DNA were included to each assay. PCR fragments were separated by 6% polyacrylamide gel electrophoresis. Methylation-positive and methylation-negative results were confirmed by bisulfite genomic sequencing technique. We analyzed 102 colorectal tissues and 40 blood samples from 51 CRC patients. MIR200B/MIR200A/MIR429 methylation analysis discloses no differences among tissues (p>0.05). However, MIR200C/MIR141 methylation showed differences between colorectal tissues and peripheral blood of CRC patients (p<0.0001) and mainly methylated alleles were observed in peripheral blood. These findings suggest a tissue-specific methylation pattern for the MIR200C/MIR141 promoter.© American Federation for Medical Research 2020. Re-use permitted under CC BY-NC. No commercial re-use. Published by BMJ.

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