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Mutational analysis of the PMS2 gene in sporadic endometrial cancers with microsatellite instability
Objective:
Approximately 20% of endometrial tumors have a defect in DNA mismatch repair and exhibit microsatellite instability (MSI). We assessed the role of the PMS2 DNA mismatch repair gene in MSI-positive sporadic endometrial tumors.
Methods:
We examined 40 sporadic endometrial tumor specimens with MSI. All 15 exons of the PMS2 gene were investigated for sequence alterations by single-strand conformational variant analysis.
Results:
Twelve polymorphisms were identified, 8 of which were in the coding sequence. Four specimens revealed mutations in intronic sequences that are not predicted to affect the PMS2 mRNA. No mutations were detected within the coding region of the PMS2 gene.
Conclusion:
We conclude that structural mutations in the PMS2 gene are not responsible for defective DNA mismatch repair in sporadic endometrial cancers with MSI. The identification of single nucleotide polymorphisms in the PMS2 locus may aid in the mapping and characterization of genetic diseases.
Insights
Mutations in the PMS2 gene do not cause DNA mismatch repair defects in sporadic endometrial cancers with microsatellite instability (MSI). PMS2 gene polymorphisms may help map genetic diseases.
Area of Science:
- Genetics
- Oncology
- Molecular Biology
Background:
- Approximately 20% of endometrial tumors exhibit microsatellite instability (MSI) due to DNA mismatch repair defects.
- The PMS2 gene is a key component of the DNA mismatch repair system.
Purpose of the Study:
- To investigate the role of the PMS2 gene in MSI-positive sporadic endometrial tumors.
- To determine if structural mutations in PMS2 cause defective DNA mismatch repair in these cancers.
Main Methods:
- Analysis of 40 sporadic endometrial tumor specimens with MSI.
- Investigation of all 15 exons of the PMS2 gene for sequence alterations using single-strand conformational variant analysis.
Main Results:
- Twelve polymorphisms were identified in the PMS2 gene, with 8 in the coding sequence.
- No mutations were found within the coding region of PMS2.
- Four intronic mutations were detected, but they are not predicted to affect PMS2 mRNA.
Conclusions:
- Structural mutations in the PMS2 gene are not the cause of defective DNA mismatch repair in sporadic endometrial cancers with MSI.
- Identification of single nucleotide polymorphisms in PMS2 may assist in mapping and characterizing genetic diseases.