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Engineering a humanized telomerase reverse transcriptase gene in mouse embryonic stem cells.

De Cheng1, Yuanjun Zhao2, Fan Zhang1

  • 1Department of Pharmaceutical Sciences, Washington State University College of Pharmacy and Pharmaceutical Sciences, Spokane, Washington, USA.

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|July 6, 2019
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Summary
This summary is machine-generated.

Researchers engineered a humanized telomerase gene (hmTert) in mice to improve disease modeling. This novel approach successfully humanized telomere homeostasis in mice, enabling better research into human-specific conditions.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Genomics

Background:

  • Telomere length and homeostasis differ significantly between humans and mice.
  • This interspecies variation complicates the use of mouse models for studying human diseases.
  • Understanding and engineering telomerase regulation is crucial for accurate disease modeling.

Purpose of the Study:

  • To engineer a humanized telomerase gene in mice to replicate human telomere homeostasis.
  • To investigate the regulatory elements of the human telomerase gene (hTERT) in mouse models.
  • To establish a more accurate mouse model for human disease research.

Main Methods:

  • Identified critical regulatory regions (5' intergenic, introns 2 and 6) of the human telomerase gene (hTERT).
  • Engineered a hybrid gene (hmTert) by inserting these human non-coding sequences into the mouse telomerase gene (mTert) locus in mouse embryonic stem cells (mESCs).
  • Assessed the functionality and regulation of the engineered hmTert gene in mESCs and differentiated cells.

Main Results:

  • The engineered hmTert gene was fully functional, supporting extensive proliferation of mESCs without chromosomal abnormalities.
  • Engineered mESCs exhibited high telomerase activity, similar to human ESCs.
  • Telomerase activity was repressed upon differentiation in a histone deacetylase-dependent manner, mimicking human-like regulation.

Conclusions:

  • Successfully engineered a humanized telomerase gene (hmTert) in mice, achieving human-like telomere homeostasis regulation.
  • This represents a significant advancement in creating more accurate mouse models for human diseases.
  • The study provides a novel strategy for engineering humanized genes in animal models.