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Cytoplasmic ATM in neurons modulates synaptic function

Jiali Li1, Yu R Han, Mark R Plummer

  • 1Department of Cell Biology and Neuroscience, Rutgers University, Piscataway, NJ 08854, USA.

Current Biology : CB
|December 8, 2009
PubMed

Insights

Ataxia-telangiectasia (A-T) neurological symptoms may stem from non-DNA repair roles of ATM protein in neurons. This study reveals ATM

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • Ataxia-telangiectasia (A-T) is a genetic disorder linked to ATM deficiency, primarily known for DNA damage repair defects.
  • A-T patients exhibit neurological symptoms like ataxia and speech defects, which are not fully explained by DNA repair deficiencies alone.
  • Mouse models with Atm mutations show impaired DNA repair but only mild neurological issues, suggesting non-DNA repair functions of ATM are crucial for neuronal health.

Purpose of the Study:

  • To investigate the non-DNA repair functions of ATM protein in neurons.
  • To explore the role of cytoplasmic ATM in neuronal function and its potential link to A-T neurological phenotypes.

Main Methods:

  • Examined the subcellular localization of ATM protein in neurons.
  • Assessed hippocampal long-term potentiation and spontaneous vesicular dye release in Atm mutant mice.
  • Investigated the interaction of cytoplasmic ATM with synaptic vesicle proteins (VAMP2, synapsin-I) and ATR.

Main Results:

  • ATM protein exhibits significant cytoplasmic distribution in neurons.
  • Atm mutant mice showed reduced hippocampal long-term potentiation and impaired spontaneous vesicular dye release.
  • Cytoplasmic ATM forms complexes with phosphorylated VAMP2 and synapsin-I, and associates with ATR.

Conclusions:

  • The neurological symptoms of A-T may arise from impaired non-DNA repair functions of ATM in the neuronal cytoplasm.
  • Cytoplasmic ATM plays a critical role in synaptic function, independent of its DNA repair role.
  • These findings suggest novel therapeutic targets for the neurological aspects of ataxia-telangiectasia.

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