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Tcf4 Regulates Synaptic Plasticity, DNA Methylation, and Memory Function.

Andrew J Kennedy1, Elizabeth J Rahn2, Brynna S Paulukaitis3

  • 1Department of Neurobiology and Evelyn F. McKnight Brain Institute, University of Alabama at Birmingham, Birmingham, AL 35294, USA; Department of Chemistry, Bates College, Lewiston, ME 04240, USA.

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|August 30, 2016
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Summary
This summary is machine-generated.

Transcription factor TCF4 haploinsufficiency causes Pitt-Hopkins syndrome. TCF4-deficient mice show learning deficits, but HDAC inhibitors and Hdac2 knockdown rescue memory, offering therapeutic insights.

Keywords:
DNA methylationE2-2HDAC inhibitorPitt-Hopkins syndromeautismautism spectrum disorderepigeneticslanguagelearning and memoryneuroepigeneticsnext-generation sequencingschizophreniasocial interactionstranscriptiontranscription factor 4

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Area of Science:

  • Neuroscience
  • Genetics
  • Developmental Biology

Background:

  • Human TCF4 haploinsufficiency causes Pitt-Hopkins syndrome (PTHS), a neurodevelopmental disorder characterized by severe intellectual disability and speech impairment.
  • TCF4 is a crucial transcription factor involved in neuronal development and function.

Purpose of the Study:

  • To investigate the behavioral and molecular consequences of Tcf4 haploinsufficiency in a mouse model.
  • To explore therapeutic strategies targeting histone deacetylase (HDAC) inhibition for cognitive deficits associated with Tcf4 haploinsufficiency.

Main Methods:

  • Generation and behavioral testing of Tcf4 haploinsufficient mice (Tcf4+/-).
  • Electrophysiological recordings of hippocampal long-term potentiation (LTP).
  • Administration of small-molecule HDAC inhibitors (e.g., vorinostat) and assessment of cognitive function.
  • Next-generation sequencing (RNA-seq and DNA methylation analysis) of hippocampal tissue.
  • Isoform-selective knockdown of Hdac2.

Main Results:

  • Tcf4(+/-) mice exhibited deficits in social interaction, vocalization, prepulse inhibition, and learning and memory.
  • Despite learning impairments, hippocampal LTP was enhanced in Tcf4(+/-) mice.
  • HDAC inhibition normalized hippocampal LTP and rescued memory deficits in Tcf4(+/-) mice.
  • Next-generation sequencing identified memory-associated genes modulated by HDAC inhibition and Tcf4 haploinsufficiency.
  • Hdac2 isoform-selective knockdown was sufficient to rescue memory deficits in Tcf4(+/-) mice.

Conclusions:

  • Tcf4 haploinsufficiency leads to complex cognitive and behavioral deficits relevant to Pitt-Hopkins syndrome.
  • HDAC inhibition, particularly targeting Hdac2, represents a promising therapeutic avenue for cognitive dysfunction in Tcf4-related disorders.