Volume 26, Issue 1 (1-2022)                   IBJ 2022, 26(1): 70-76 | Back to browse issues page

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Raji N, Majidi Zadeh T, Babaheidarian P, Houshmand M. Detection of Microsatellite Instability by High-Resolution Melting Analysis in Colorectal Cancer. IBJ 2022; 26 (1) :70-76
URL: http://ibj.pasteur.ac.ir/article-1-3062-en.html
Background: Colorectal cancer (CRC) is the third most common cancer worldwide. microsatellite instability (MSI) is a molecular marker of a deficient mismatch repair system and happens in almost 15% of CRCs. Because of a wide frequency of MSI+ CRC in Iran compared to other parts of the world, the importance of screening for this type of cancer is highlighted. Methods: The most common MSI detection technique is a fluorescent PCR-based method in which fragments are analyzed by capillary electrophoresis (CE). This technique is very time-consuming, difficult, and expensive. We sought to develop and evaluate a proper method with high accuracy, specificity, and sensitivity to screen the MSI+ CRC. A high-resolution melting (HRM) analysis procedure is relying on the analysis of the melting curve attributes. Low cost, feasibility, high specificity, and sensitivity are outstanding attributes of HRM analysis. Results: Five mononucleotide microsatellite markers, including BAT-25, BAT-26, NR-21, NR-24, and NR-27, in 25 archival CRC tumor tissue samples were compared with normal tissue adjacent using HRM method. The specificity and sensitivity of BAT-25 with HRM method were 100% compared to CE, while other markers had lower sensitivity. However, when all the markers were considered together, the sensitivity and specificity became 100%. The number of MSI+ samples was 56%, which shows a higher ratio than previous Iranian studies. The highest MSI was related to BAT-26 (52%). Conclusion: The HRM method is much simpler and more cost-effective than current MSI techniques, and its sensitivity and accuracy are comparable. Therefore, it can serve as an alternative method in cases where CE is unavailable.

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