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Related Experiment Videos

Development of an HIV-based cDNA expression cloning system.

Marc van Maanen1, Jennie K Tidwell, Lawrence A Donehower

  • 1Department of Molecular Virology and Microbiology, Baylor College of Medicine, Houston, Texas 77030, USA.

Molecular Therapy : the Journal of the American Society of Gene Therapy
|July 5, 2003
PubMed
Summary

This study introduces an improved human immunodeficiency virus (HIV)-based cDNA expression cloning system. This novel system efficiently identifies genes in diverse cell types, including non-dividing cells, by enabling functional screening of cDNA libraries.

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Area of Science:

  • Molecular Biology
  • Virology
  • Genetics

Background:

  • Expression cloning is vital for identifying genes by function.
  • Current oncoretroviral cDNA expression systems have limitations in target cell range and selectable markers.

Purpose of the Study:

  • To develop an improved cDNA library transfer system utilizing human immunodeficiency virus type-1 (HIV).
  • To demonstrate the system's efficiency in expression cloning across various cell types.

Main Methods:

  • Developed a packaging system for high-titer HIV vector stocks.
  • Transduced cells (HOS TK(-), HPRT(-) fibroblasts, senescent fibroblasts) with HIV-based cDNA libraries.
  • Performed functional selection for specific gene expression (TK, HPRT, SV40 large T antigen).

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Main Results:

  • Successfully produced high-titer HIV vector stocks.
  • Demonstrated efficient isolation of thymidine kinase (TK) and hypoxanthine guanine phosphoribosyltransferase-1 (HPRT) cDNAs.
  • Isolated SV40 large T antigen cDNA from senescent cells, overcoming proliferation blocks.

Conclusions:

  • The HIV-based cDNA expression cloning system is effective for identifying genes based on function.
  • The system broadens the scope of expression cloning to primary and non-dividing cells.
  • This technology facilitates the cloning of low-abundance cDNAs.