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Human mini-chromosomes in mouse embryonal stem cells

M H Shen1, J Yang, M L Loupart

  • 1Cancer Research Campaign Chromosome Molecular Biology Group, Biochemistry Department, Oxford University, UK.

Human Molecular Genetics
|August 1, 1997
PubMed
Summary
This summary is machine-generated.

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Human mini-chromosomes were introduced into mouse stem cells. One 4 Mb mini-chromosome adapted by acquiring mouse centromeric sequences, enabling stable maintenance and potential use as a mouse chromosome vector.

Area of Science:

  • Genetics
  • Molecular Biology
  • Cell Biology

Background:

  • Human mini-chromosomes (HMCs) are artificial chromosomes used in research.
  • HMCs exhibit varying stability across different cell types.
  • Mouse embryonal stem cells (mESCs) are crucial for genetic manipulation and developmental studies.

Purpose of the Study:

  • To assess the stability and behavior of human mini-chromosomes (HMCs) in mouse embryonal stem cells (mESCs).
  • To investigate the potential of HMCs as vectors for the mouse germ line.

Main Methods:

  • Introduction of 4 Mb and 15 Mb HMCs into mESCs.
  • Monitoring HMC stability and segregation in mESCs under selective and non-selective conditions.
  • Characterization of HMC rearrangements and acquisition of mouse centromeric sequences.

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Main Results:

  • HMCs showed instability and aberrant segregation in mESCs, leading to rapid loss without selection.
  • One 4 Mb HMC underwent rearrangement, acquired mouse centromeric sequences, and achieved stable maintenance for over 60 population doublings.
  • This adapted HMC demonstrated potential for long-term propagation in mESCs.

Conclusions:

  • HMCs require adaptation, including the acquisition of species-specific centromeric sequences, for stable maintenance in mESCs.
  • The 4 Mb rearranged HMC is a promising candidate for a novel mouse germ line chromosome vector.
  • This study highlights the challenges and potential solutions for utilizing HMCs in mammalian germ line applications.