Related Experiment Videos
The prevalence of mtDNA4977 deletion in primary human endometrial carcinomas and matched control samples
Konrad Futyma1, Lechoslaw Putowski, Marek Cybulski
1Second Department of Gynecology, Lublin Medical University, 8 Jaczewski Street, Lublin, Poland.
Abstract:
mtDNA4977, the most common deletion of the mitochondrial DNA, has been detected in different types of human neoplasia. The aim of the current study was to determine the prevalence of mtDNA4977 deletion in primary human endometrial carcinomas (EC) as compared with matched control samples. Thirty-seven matched control tissues and EC samples were enrolled, and the 4977-bp mtDNA deletion was investigated using a PCR-based technique. Deletion of mtDNA4977 was detected in 32 out of 37 (84%) matched control samples and in 30 out of 37 (81%) ECs. A statistically significant correlation of mtDNA4977/wild-type mtDNA ratios was noted between normal and cancerous human endometrial tissues (R=0.844, p<0.0001). The intensity ratio of mtDNA bands was significantly higher in normal samples than in malignant human endometrial tissues (p=0.021). The mean mtDNA4977/wild-type mtDNA ratio was significantly higher in the control group (0.655+/-0.379) than in the cancer group (0.570+/-0.04, p=0.048) of patients between 50 and 60 years of age. Notably, there was a relationship between clinical stage of the disease (stage II versus III) and the amount of mtDNA4977 in ECs (p=0.048). The sequence analysis of two randomly selected EC-positive cases confirmed that amplified fragments originated from mtDNA, and both encompassed deletion. In conclusion, we suggest that mitochondrial 4977-bp deletion is not specific to EC tissues. The accumulation of mtDNA4977 may be associated with aging processes, particularly in peri-menopausal women affected by EC.
Insights
The common mitochondrial DNA (mtDNA) 4977 deletion was found in most endometrial cancer and control samples. Its accumulation may link to aging, especially in women aged 50-60 with endometrial cancer.
Area of Science:
- Genetics
- Mitochondrial Biology
- Oncology
Background:
- The common 4977-bp deletion in mitochondrial DNA (mtDNA) is frequently observed in various human cancers.
- Its specific prevalence and role in endometrial carcinoma (EC) require further investigation.
Purpose of the Study:
- To determine the prevalence of the mtDNA4977 deletion in primary human endometrial carcinomas (ECs).
- To compare the frequency of this deletion in EC tissues versus matched normal control samples.
- To explore potential correlations between the mtDNA4977 deletion and clinical factors in EC patients.
Main Methods:
- Utilized a PCR-based technique to detect the 4977-bp deletion in 37 matched pairs of EC and control tissues.
- Quantified the ratio of mtDNA4977 deletion to wild-type mtDNA.
- Performed sequence analysis on selected positive cases to confirm the deletion's origin and integrity.
Main Results:
- The mtDNA4977 deletion was highly prevalent, detected in 84% of control samples and 81% of EC samples.
- A significant correlation (R=0.844, p<0.0001) was found in mtDNA4977/wild-type mtDNA ratios between normal and cancerous endometrial tissues.
- The mean mtDNA4977/wild-type mtDNA ratio was significantly higher in controls than in EC patients aged 50-60 (p=0.048).
- A notable relationship existed between clinical stage (II vs. III) and the amount of mtDNA4977 in ECs (p=0.048).
Conclusions:
- The mitochondrial 4977-bp deletion is not specific to endometrial carcinoma tissues.
- Its accumulation may be associated with the aging process, particularly in peri-menopausal women diagnosed with EC.
- Further research is warranted to elucidate the precise role of mtDNA deletions in endometrial carcinogenesis and aging.