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Embryonic stem cells and somatic cells differ in mutation frequency and type.

Rachel B Cervantes1, James R Stringer, Changshun Shao

  • 1Department of Cell Biology, Neurobiology, and Anatomy, University of Cincinnati, Vontz Center for Molecular Studies, Cincinnati, OH 45267-052, USA.

Proceedings of the National Academy of Sciences of the United States of America
|March 14, 2002
PubMed
Summary
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Pluripotent embryonic stem (ES) cells exhibit lower mutation frequencies than somatic cells. However, they show increased risks for tumor formation due to uniparental disomy (UPD) after extended culture, a concern for stem cell therapies.

Area of Science:

  • Genetics
  • Stem Cell Biology
  • Genomic Instability

Background:

  • Embryonic stem (ES) cells are crucial for disease modeling and potential therapeutic applications.
  • Understanding the mutational landscape of ES cells is vital for safe therapeutic use.

Purpose of the Study:

  • To compare mutation frequencies and types in murine ES cells versus embryonic somatic cells.
  • To investigate the genomic stability of ES cells during extended culture.

Main Methods:

  • Analysis of spontaneous mutations at the adenine phosphoribosyltransferase (Aprt) locus in ES cells and mouse embryonic fibroblasts.
  • Assessment of loss of heterozygosity (LOH) mechanisms, including mitotic recombination and chromosome loss/reduplication leading to uniparental disomy (UPD).

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Main Results:

  • ES cells showed significantly lower mutation frequencies compared to mouse embryonic fibroblasts.
  • Mitotic recombination was suppressed in ES cells, with chromosome loss/reduplication (leading to UPD) being the predominant LOH mechanism.
  • Extended ES cell culture led to accumulation of adenine phosphoribosyltransferase deficiency and UPD.

Conclusions:

  • ES cells exhibit distinct mutational patterns compared to somatic cells, with a higher propensity for UPD.
  • The accumulation of UPD in cultured ES cells poses a potential risk for tumor formation due to homozygosity at recessive disease loci.
  • Caution is warranted regarding the use of extended-cultured ES cells in therapeutic applications due to increased tumorigenesis risk.