DNA mismatch repair proteins: scientific update and practical guide

Area of Science:

• Molecular biology
• Genetics
• Oncology

Background:

• DNA mismatch repair (MMR) proteins are crucial for correcting DNA replication errors.
• Deficient MMR (dMMR) is linked to increased neoplasia risk.
• dMMR status influences cancer diagnosis and treatment strategies.

Purpose of the Study:

• To review the biology of MMR proteins and their associated genes.
• To discuss the mechanisms leading to dMMR.
• To highlight the clinical significance and identification of dMMR in cancer.

Main Methods:

• Literature review of MMR biology, genetics, and clinical applications.
• Synthesis of current knowledge on dMMR development and detection.
• Analysis of dMMR's role in neoplasia and Lynch syndrome.

Main Results:

• MMR proteins ensure genomic stability by repairing DNA replication errors.
• dMMR arises from various genetic and epigenetic mechanisms.
• dMMR is a biomarker for Lynch syndrome and predicts differential responses to therapies.

Conclusions:

• Understanding MMR biology is key to diagnosing and managing MMR-deficient cancers.
• dMMR identification has significant implications for inherited cancer risk assessment.
• dMMR status guides personalized treatment decisions, especially favoring immunotherapy.