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DNA replication error is frequent in ovarian granulosa cell tumors
1Department of Obstetrics and Gynecology, Jichi Medical School, Kawachi, Tochigi, Japan.
Abstract:
DNA replication errors (RER) have been detected in epithelial ovarian cancers, as well as in other human tumor types. These observations suggest that this genetic defect is present in ovarian granulosa cell tumors, and that a DNA mismatch repair deficiency may be involved in their development and/or progression. We therefore assayed tissue samples from 29 patients with granulosa cell tumors for RER, using polymerase chain reaction (PCR) and 5 microsatellite markers. The RER were observed at greater than or equal to 1 loci in 15 (58%) of 26 informative cases. The incidence of RER was unrelated to the patient's age or the histologic subtype or clinical stage of the tumors. The RER, however, were observed in 57% (8/14) of the informative patients with stage IA disease. These findings suggest that a DNA mismatch repair deficiency may contribute to the pathogenesis of ovarian granulosa cell tumors, and that this deficiency may be an early event in their development and/or progression.
Insights
DNA replication errors (RER) are common in ovarian granulosa cell tumors, indicating a potential DNA mismatch repair deficiency. This genetic defect may play an early role in tumor development and progression.
Area of Science:
- Oncology
- Genetics
- Molecular Biology
Background:
- DNA replication errors (RER) are observed in various human cancers.
- Ovarian granulosa cell tumors may also exhibit these genetic defects.
- DNA mismatch repair deficiency is a potential factor in tumor development.
Purpose of the Study:
- To investigate the presence and incidence of RER in ovarian granulosa cell tumors.
- To determine if RER is associated with DNA mismatch repair deficiency.
- To explore the potential role of RER in the pathogenesis of these tumors.
Main Methods:
- Assay of tissue samples from 29 patients with granulosa cell tumors.
- Utilized polymerase chain reaction (PCR) and 5 microsatellite markers to detect RER.
- Analyzed RER incidence in relation to patient age, histologic subtype, and clinical stage.
Main Results:
- RER were detected in 58% (15/26) of informative cases at one or more loci.
- The incidence of RER was not correlated with patient age, tumor subtype, or clinical stage.
- RER were found in 57% (8/14) of informative patients with stage IA disease.
Conclusions:
- DNA mismatch repair deficiency may contribute to the pathogenesis of ovarian granulosa cell tumors.
- The presence of RER suggests a potential role for DNA mismatch repair deficiency in these tumors.
- This deficiency may represent an early event in the development or progression of ovarian granulosa cell tumors.