What Causes Microsatellite Instability (MSI) in Cancer?

Discover the common causes of microsatellite instability (MSI) linked to DNA mismatch repair defects and their impact on cancer development.

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Microsatellite instability (MSI) is commonly caused by defects in the DNA mismatch repair (MMR) system. These defects can arise due to genetic mutations in the MMR genes such as MLH1, MSH2, MSH6, and PMS2. When these genes are not functioning properly, errors that occur during DNA replication are not corrected, leading to MSI. MSI is frequently associated with certain types of cancer, including colorectal and endometrial cancers.

FAQs & Answers

  1. What is microsatellite instability (MSI)? MSI is a condition where repetitive DNA sequences become unstable due to defects in the DNA mismatch repair system, leading to increased mutation rates.
  2. Which genes are commonly involved in causing MSI? Mutations in mismatch repair genes such as MLH1, MSH2, MSH6, and PMS2 are common causes of MSI.
  3. How is MSI related to cancer? MSI is frequently observed in certain cancers like colorectal and endometrial cancer, where defective DNA repair leads to genetic mutations that promote tumor development.
  4. Can MSI status influence cancer treatment decisions? Yes, MSI status can guide treatment options, including the use of immunotherapy, as tumors with MSI may respond differently to certain therapies.

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