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Phenylketonuria (PKU) is a protein metabolism disorder characterized by high blood levels of the amino acid phenylalanine. This results from a mutation in the gene responsible for phenylalanine hydroxylase, an enzyme that converts phenylalanine into tyrosine. When this enzyme is deficient, phenylalanine builds up in the blood, leading to symptoms such as vomiting, rashes, seizures, growth deficiency, and severe mental retardation. An early diagnosis and a diet restricting phenylalanine intake...
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Updated: Apr 22, 2026

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Hippocampal synaptic connectivity in phenylketonuria.

Katja Horling1, Gudrun Schlegel2, Sarah Schulz2

  • 1Institute of Neuroanatomy, Institute of Anatomy and Experimental Morphology and.

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|October 10, 2014
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Summary

Reduced microglial activity in phenylketonuria (PKU) mouse models impairs synaptic pruning and hippocampal development, potentially causing mental retardation. This study highlights impaired synaptic transmission

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Area of Science:

  • Neuroscience
  • Genetics
  • Developmental Biology

Background:

  • Phenylketonuria (PKU) in humans results from phenylalanine hydroxylase (Pah) deficiency, leading to severe intellectual disability.
  • The precise mechanisms underlying PKU-associated neurodevelopmental deficits remain unclear.

Purpose of the Study:

  • To investigate the impact of Pah deficiency on hippocampal synaptic function and plasticity in a mouse model.
  • To elucidate the role of microglial activity in PKU-related cognitive impairments.

Main Methods:

  • Electrophysiological recordings (LTP, paired-pulse facilitation) in hippocampal slices from Pah(enu2)/c57bl6 mice.
  • Analysis of presynaptic and postsynaptic protein expression via Western blotting.
  • Stereological assessment of synaptic density using electron microscopy.
  • In vitro studies using cultured hippocampal neurons.

Main Results:

  • Impaired long-term potentiation and paired-pulse facilitation in hippocampal slices of Pah-deficient mice.
  • Altered expression of synaptic proteins, including reduced presynaptic markers (synaptophysin, SNAP-25) and increased postsynaptic markers (synaptopodin, spinophilin).
  • Increased hippocampal synaptic density and significantly reduced microglial activity in Pah(enu2)/c57bl6 mice.

Conclusions:

  • Reduced microglial activity in PKU mouse models disrupts normal synaptic pruning during postnatal development.
  • Impaired synaptic transmission and subsequent alterations in synaptic remodeling contribute to the neurodevelopmental deficits observed in PKU.
  • These findings suggest a critical role for microglia-mediated synaptic refinement in preventing cognitive impairment in PKU.