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Requirement for Ku80 in growth and immunoglobulin V(D)J recombination

A Nussenzweig1, C Chen, V da Costa Soares

  • 1Department of Medical Physics, Memorial Sloan-Kettering Cancer Centre, New York 10021, USA.

Nature
|August 8, 1996
PubMed

Insights

The DNA-binding protein Ku80 is crucial for DNA repair and V(D)J recombination in lymphocytes. Ku80 deficiency also unexpectedly impairs mammalian growth control.

Area of Science:

  • Molecular Biology
  • Immunology
  • Genetics

Background:

  • DNA-dependent protein kinase (DNA-PK) is vital for DNA repair, replication, transcription, and V(D)J recombination.
  • The DNA-binding subunit of DNA-PK, Ku80, plays a key role in these processes.

Purpose of the Study:

  • To investigate the in vivo function of the Ku80 subunit of DNA-PK.
  • To elucidate the role of Ku80 in lymphocyte development and DNA repair mechanisms.

Main Methods:

  • Targeted gene knockout of Ku80 in mice (Ku80-/-).
  • Analysis of lymphocyte development and V(D)J rearrangement in mutant mice.
  • Assessment of cell proliferation, doubling time, and cell-cycle checkpoints in Ku80-/- fibroblasts.

Main Results:

  • Ku80 deficiency resulted in arrested T and B lymphocyte development and impaired V(D)J rearrangement.
  • Ku80-/- mice exhibited a significant growth defect, being 40-60% smaller than controls.
  • Fibroblasts from Ku80-/- embryos showed reduced proliferation, longer doubling times, and intact cell-cycle checkpoints.

Conclusions:

  • Ku80 is essential for normal lymphocyte development and V(D)J recombination.
  • The study reveals an unexpected role for Ku80 in mammalian growth control.
  • Ku80's function extends beyond DNA repair to influence cellular proliferation and overall organismal growth.

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