Prevalence of alternative lengthening of telomeres in pediatric sarcomas determined by the telomeric DNA C-circle assay
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View abstract on PubMed
Summary
This summary is machine-generated.Alternative lengthening of telomeres (ALT) was detected in 2.7% of rhabdomyosarcomas and 71% of osteosarcomas using the C-circle assay. This assay is a sensitive biomarker for ALT cancers, including sarcomas.
Area Of Science
- Oncology
- Molecular Biology
- Genetics
Background
- Alternative lengthening of telomeres (ALT) is a telomere maintenance mechanism observed in various cancers.
- ALT cancers exhibit distinct patterns of therapy resistance and sensitivity.
- Telomeric DNA C-circles are specific biomarkers for ALT cancers.
Purpose Of The Study
- To determine the frequency of ALT in pediatric sarcomas, specifically Ewing's family sarcoma (EFS), rhabdomyosarcoma (RMS), and osteosarcoma (OS).
- To evaluate the utility of the C-circle assay (CCA) for detecting ALT in these sarcoma subtypes.
Main Methods
- DNA was extracted from fresh frozen primary tumor samples of EFS, RMS, and OS.
- C-circles were enriched using isothermal rolling cycle amplification.
- Real-time PCR was employed to detect and quantify C-circles, utilizing established cutoffs.
Main Results
- Out of 94 EFS samples, 0 were C-circle positive (0% ALT).
- Out of 187 RMS samples, 5 were C-circle positive (2.7% ALT).
- Out of 87 OS samples, 62 were C-circle positive (71% ALT).
Conclusions
- The C-circle assay (CCA) identified ALT in 2.7% of RMS and 71% of OS, with no ALT detected in EFS.
- CCA is a robust and sensitive method for identifying ALT in sarcomas.
- CCA holds potential as a companion diagnostic for targeted ALT therapeutics.
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