Adult restoration of Shank3 expression rescues selective autistic-like phenotypes

Nature. 2016 Feb 25;530(7591):481-4. doi: 10.1038/nature16971. Epub 2016 Feb 17.

Abstract

Because autism spectrum disorders are neurodevelopmental disorders and patients typically display symptoms before the age of three, one of the key questions in autism research is whether the pathology is reversible in adults. Here we investigate the developmental requirement of Shank3 in mice, a prominent monogenic autism gene that is estimated to contribute to approximately 1% of all autism spectrum disorder cases. SHANK3 is a postsynaptic scaffold protein that regulates synaptic development, function and plasticity by orchestrating the assembly of postsynaptic density macromolecular signalling complex. Disruptions of the Shank3 gene in mouse models have resulted in synaptic defects and autistic-like behaviours including anxiety, social interaction deficits, and repetitive behaviour. We generated a novel Shank3 conditional knock-in mouse model, and show that re-expression of the Shank3 gene in adult mice led to improvements in synaptic protein composition, spine density and neural function in the striatum. We also provide behavioural evidence that certain behavioural abnormalities including social interaction deficit and repetitive grooming behaviour could be rescued, while anxiety and motor coordination deficit could not be recovered in adulthood. Together, these results reveal the profound effect of post-developmental activation of Shank3 expression on neural function, and demonstrate a certain degree of continued plasticity in the adult diseased brain.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Age Factors
  • Aging / genetics
  • Animals
  • Anxiety / genetics
  • Autism Spectrum Disorder / genetics*
  • Autism Spectrum Disorder / physiopathology*
  • Autism Spectrum Disorder / psychology
  • Dendritic Spines / metabolism
  • Disease Models, Animal
  • Female
  • Gene Knock-In Techniques
  • Grooming
  • Male
  • Mice
  • Mice, Inbred C57BL
  • Motor Skills Disorders / genetics
  • Motor Skills Disorders / physiopathology
  • Neostriatum / cytology
  • Neostriatum / metabolism
  • Neostriatum / pathology
  • Nerve Tissue Proteins / genetics*
  • Nerve Tissue Proteins / metabolism*
  • Neuronal Plasticity / genetics
  • Phenotype*
  • Post-Synaptic Density / chemistry
  • Post-Synaptic Density / metabolism
  • Psychomotor Performance
  • Social Behavior

Substances

  • Nerve Tissue Proteins
  • Shank3 protein, mouse