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[Disruption of mismatch repair system in human cancers]
1Department of Molecular Pathology, Tohoku University School of Medicine.
Abstract:
It is known that transformation of normal cells to cancer cells is caused by the accumulation of successive mutations in oncogenes and/or tumor suppressor genes. Since four DNA mismatch repair genes (hMSH2, hMLH1, hPMS1 and hPMS2) have been identified as the cause of hereditary nonpolyposis colorectal cancer (HNPCC), the role of defective mismatch repair system in the development of sporadic cancers with microsatellite instability has also been discussed. Defects in mismatch repair genes would contribute to mutations in genes, including oncogenes and tumor suppressor genes, at an increased rate. Furthermore, recent investigations suggested that this mechanism was also involved in the development of multiple primary cancers as well.
Insights
Defective DNA mismatch repair genes can lead to microsatellite instability, increasing mutations in cancer-related genes. This mechanism may also contribute to the development of multiple primary cancers.
Area of Science:
- Molecular biology
- Genetics
- Cancer research
Context:
- Cancer development involves accumulated mutations in oncogenes and tumor suppressor genes.
- Hereditary nonpolyposis colorectal cancer (HNPCC) is linked to mutations in four DNA mismatch repair genes (hMSH2, hMLH1, hPMS1, hPMS2).
- The role of defective mismatch repair in sporadic cancers with microsatellite instability is under investigation.
Purpose:
- To explore the role of defective DNA mismatch repair systems in sporadic cancer development.
- To understand how mismatch repair defects contribute to increased mutation rates in critical genes.
- To investigate the potential involvement of this mechanism in the development of multiple primary cancers.
Summary:
- Defects in DNA mismatch repair genes accelerate mutations in oncogenes and tumor suppressor genes.
- Microsatellite instability, resulting from faulty mismatch repair, is implicated in sporadic cancers.
- This pathway may also play a role in the pathogenesis of multiple primary cancers.
Impact:
- Highlights the significance of DNA mismatch repair in cancer prevention and treatment.
- Provides insights into the genetic basis of sporadic cancers and multiple primary malignancies.
- Suggests potential therapeutic targets related to DNA repair pathways.