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Rasopathy-Associated Mutation Ptpn11D61Y has Age-Dependent Effect on Synaptic Vesicle Recycling.

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Rasopathies, like Noonan syndrome, disrupt brain function. This study shows PTPN11 variants impair synaptic vesicle trafficking in mature mouse neurons, impacting neurotransmission and potentially cognitive deficits.

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Area of Science:

  • Neuroscience
  • Genetics
  • Molecular Biology

Background:

  • Rasopathies are genetic disorders linked to developmental and intellectual disabilities.
  • Noonan syndrome, a common Rasopathy, arises from PTPN11 gene mutations in over 50% of cases.
  • PTPN11 regulates postsynaptic glutamate receptor trafficking in mammalian neurons, implicated in cognitive impairments.

Purpose of the Study:

  • To investigate the presynaptic role of PTPN11 in mammalian neurons.
  • To examine the impact of Rasopathy-associated PTPN11 variants on synaptic vesicle trafficking.

Main Methods:

  • Cultured mouse cortical neurons expressing the PTPN11D61Y variant.
  • Analysis of membrane trafficking of synaptic vesicles.
  • Comparison between immature (DIV12) and mature (DIV21) neurons.

Main Results:

  • Expression of PTPN11D61Y reduced the readily releasable and total recycling pools of synaptic vesicles.
  • Synaptic vesicle release competence decreased, accompanied by a slower rate of synaptic vesicle retrieval.
  • Presynaptic deficits were observed in mature neurons but not in immature neurons.

Conclusions:

  • Balanced PTPN11 activity is crucial for normal synaptic vesicle trafficking in presynaptic terminals of mature neurons.
  • Disrupted PTPN11 function may contribute to neurological deficits in Rasopathies.
  • This study highlights a presynaptic role for PTPN11 in mammals.