Loss of ATM kinase activity leads to embryonic lethality in mice

Research output: Contribution to journalJournal articleResearchpeer-review

  • J.A. Daniel
  • M. Pellegrini
  • D. Filsuf
  • A. Nussenzweig
  • N.V. Belkina
  • L. Feigenbaum
  • B.-S. Lee
  • B.P. Sleckman
  • Z. You
  • Zhiqun Guo
  • T.T. Paull
Ataxia telangiectasia (A-T) mutated (ATM) is a key deoxyribonucleic acid (DNA) damage signaling kinase that regulates DNA repair, cell cycle checkpoints, and apoptosis. The majority of patients with A-T, a cancer-prone neurodegenerative disease, present with null mutations in Atm. To determine whether the functions of ATM are mediated solely by its kinase activity, we generated two mouse models containing single, catalytically inactivating point mutations in Atm. In this paper, we show that, in contrast to Atm-null mice, both D2899A and Q2740P mutations cause early embryonic lethality in mice, without displaying dominant-negative interfering activity. Using conditional deletion, we find that the D2899A mutation in adult mice behaves largely similar to Atm-null cells but shows greater deficiency in homologous recombination (HR) as measured by hypersensitivity to poly (adenosine diphosphate-ribose) polymerase inhibition and increased genomic instability. These results may explain why missense mutations with no detectable kinase activity are rarely found in patients with classical A-T. We propose that ATM kinase-inactive missense mutations, unless otherwise compensated for, interfere with HR during embryogenesis.
Original languageEnglish
JournalJournal of Cell Biology
Volume198
Issue number3
Pages (from-to)295-304
Number of pages10
ISSN0021-9525
DOIs
Publication statusPublished - 6 Aug 2012

ID: 46454172