De Novo Cancer Mutations Frequently Associate with Recurrent Chromosomal Abnormalities during Long-Term Human Pluripotent Stem Cell Culture
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View abstract on PubMed
Summary
This summary is machine-generated.Human pluripotent stem cells (hPSCs) accumulate genetic mutations during lab growth. Recurrent chromosomal gains in 1q and 20q appear to drive the acquisition of cancer-related mutations over time.
Area Of Science
- Stem cell biology
- Genetics
- Regenerative medicine
Background
- Human pluripotent stem cells (hPSCs) are crucial for regenerative medicine.
- In vitro expansion of hPSCs can lead to genetic abnormalities, impacting clinical safety.
- Understanding these genetic changes is vital for safe hPSC applications.
Purpose Of The Study
- To investigate the dynamics of chromosomal abnormalities and single-nucleotide variants (SNVs) in cancer-related genes during hPSC in vitro culture.
- To determine if genetic changes accumulate over time or if mutation rates increase.
- To identify potential drivers of genetic instability in hPSCs.
Main Methods
- Analysis of ten human embryonic stem cell lines across multiple passages.
- Whole-genome sequencing to detect copy number variants (CNVs) and SNVs.
- Focus on 380 cancer-related genes and chromosomal gains in 1q and 20q.
Main Results
- 80% of hPSC lines acquired gains of chromosome 20q or 1q after prolonged culture.
- 70% of lines developed other copy number variants (CNVs).
- All lines acquired de novo single-nucleotide variants (SNVs), with higher loads at later passages due to cumulative mutation acquisition.
- SNVs and rare CNVs often followed the acquisition of recurrent chromosomal gains.
Conclusions
- Recurrent chromosomal abnormalities, particularly gains in 1q and 20q, may act as drivers for acquiring other mutations in hPSCs.
- Genetic instability increases with prolonged in vitro culture of hPSCs.
- These findings highlight the importance of monitoring genetic integrity for safe clinical translation of hPSC therapies.
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