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Author Spotlight: FISH as a Tool for Precise Gene Amplification Assessment in Cancer Specimens
Published on: July 12, 2024
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Mapping extrachromosomal DNA amplifications during cancer progression.
Hoon Kim1,2,3, Soyeon Kim4,5, Taylor Wade6
1Department of Biopharmaceutical Convergence, School of Pharmacy, Sungkyunkwan University, Suwon-si, South Korea. wisekh@skku.edu.
Nature Genetics
|October 14, 2024
Summary
Extrachromosomal DNA (ecDNA) amplifications are more common in advanced cancers and may help tumors respond to treatment. These genetic elements, extrachromosomal DNA (ecDNA), provide competitive advantages during cancer progression and metastasis.
Area of Science:
- Oncology
- Genetics
- Molecular Biology
Background:
- Extrachromosomal DNA (ecDNA) amplifications play a role in cancer progression.
- Understanding the prevalence and characteristics of ecDNA is crucial for cancer research.
Purpose of the Study:
- To investigate the role of extrachromosomal DNA (ecDNA) amplifications in cancer progression and treatment response.
- To detect and classify focal amplifications in various cancer stages.
Main Methods:
- Analysis of focal amplifications in 8,060 primary cancers, untreated metastases, and pretreated tumors.
- Comparison of ecDNA frequency across different cancer stages and treatment statuses.
- Longitudinal analysis of matched tumor samples to assess ecDNA retention.
Main Results:
- Extrachromosomal DNA (ecDNA) amplifications were significantly more frequent in untreated metastatic and pretreated tumors than in newly diagnosed cancers.
- Tumors from chemotherapy-pretreated patients showed higher ecDNA frequency compared to untreated cancers.
- Extrachromosomal DNA (ecDNA) increases were associated with tubulin inhibition, suggesting a role in treatment response.
- EcDNAs were more likely retained than chromosomal amplifications in longitudinal samples.
- EcDNAs in advanced cancers and those shared between time points showed more localized hypermutation events, indicating early mutagenesis.
Conclusions:
- Extrachromosomal DNA (ecDNA) amplifications are prevalent in advanced cancers and contribute to tumor progression and metastasis.
- EcDNAs may confer a competitive advantage to tumors, influencing their response to therapies.
- Early mutagenesis of ecDNA is implicated in cancer development.
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