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Mismatch Repair Deficiency and the Role of Non-Canonical Functions in Cancer: Diagnosis and Therapeutic Implications
Alicja Dąbrowska1, Jakub Mastalerz1, Zofia Łapińska2
1Faculty of Medicine, Wroclaw Medical University, Pasteura 1, 50-367 Wroclaw, Poland.
Abstract:
The mismatch repair system is critical for correcting base-base mismatches and insertion-deletion loops during DNA replication. Deficiencies in MMR (due to mutations in MLH1, MSH2, MSH6, or PMS2) lead to microsatellite instability and contribute to the development of various cancers, such as Lynch syndrome-related colorectal cancer and sporadic tumors. This review will delve into the molecular basis of MMR deficiency. Additionally, the review will cover diagnostic approaches for detecting MSI and MMR deficiency, including next-generation sequencing and PCR-based methods. The implications for treatment will be discussed, emphasizing immune checkpoint inhibitors (e.g., pembrolizumab) that target tumors with high mutational burdens due to MMR deficiency, as well as novel therapeutic approaches like synthetic lethality exploiting DNA repair vulnerabilities.
Insights
Mismatch repair (MMR) deficiency causes microsatellite instability, contributing to cancers like Lynch syndrome. Understanding MMR is key for diagnosing and treating these tumors, especially with new therapies targeting DNA repair vulnerabilities.
Area of Science:
- Molecular biology
- Genetics
- Oncology
Background:
- The mismatch repair (MMR) system corrects DNA replication errors.
- MMR deficiencies, caused by mutations in MLH1, MSH2, MSH6, or PMS2, result in microsatellite instability (MSI).
- MSI is linked to various cancers, including Lynch syndrome-related and sporadic tumors.
Purpose of the Study:
- To review the molecular basis of MMR deficiency.
- To discuss diagnostic methods for MSI and MMR deficiency.
- To explore therapeutic implications of MMR deficiency.
Main Methods:
- Literature review focusing on molecular mechanisms, diagnostics, and therapeutics.
- Analysis of diagnostic techniques like next-generation sequencing and PCR.
- Examination of treatment strategies, including immunotherapy and synthetic lethality.
Main Results:
- MMR deficiency underlies MSI and drives tumorigenesis.
- Accurate detection of MSI/MMR deficiency is crucial for patient stratification.
- Targeted therapies, such as immune checkpoint inhibitors and synthetic lethality approaches, show promise.
Conclusions:
- MMR deficiency is a significant factor in cancer development and progression.
- Advanced diagnostic tools enable precise identification of MMR-deficient tumors.
- Therapeutic strategies targeting MMR deficiency offer new avenues for cancer treatment.
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