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Identification of two novel Shank3 transcripts in the developing mouse neocortex.

Chikako Waga1, Hirotsugu Asano, Tomomi Sanagi

  • 1Department of Neurochemistry, National Institute of Neuroscience, Kodaira, Tokyo, Japan; Department of Mental Retardation and Birth Defect Research, National Institute of Neuroscience, Kodaira, Tokyo, Japan.

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Summary

Researchers identified novel SHANK3 isoforms, Shank3c-3 and Shank3c-4, potentially linked to autism spectrum disorder (ASD) and Rett syndrome neuropathology. Their expression is regulated by MeCP2 during brain development.

Keywords:
DNA methylationMeCP2SHANK3autism spectrum disorder

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Area of Science:

  • Neuroscience
  • Genetics
  • Developmental Biology

Background:

  • SHANK3 is a key synaptic scaffolding protein implicated in autism spectrum disorder (ASD) pathogenesis.
  • Existing research on SHANK3 isoforms in brain development is limited.
  • Mutations in SHANK3 are linked to specific ASD phenotypes.

Purpose of the Study:

  • To identify and characterize novel SHANK3 transcripts and their protein isoforms.
  • To investigate the developmental expression patterns of these novel SHANK3 transcripts.
  • To explore the role of methyl CpG-binding protein 2 (MeCP2) in regulating novel SHANK3 transcript expression.

Main Methods:

  • Identification of novel Shank3 transcripts (Shank3c-3 and Shank3c-4) using molecular biology techniques.
  • Analysis of Shank3 transcript expression during mouse brain development.
  • Comparison of Shank3 transcript expression in wild-type and Mecp2-deficient mice.

Main Results:

  • Two novel amino-terminus truncated Shank3 transcripts, Shank3c-3 and Shank3c-4, were identified, originating from intron 10.
  • Expression of these transcripts shows dynamic changes during postnatal development, increasing after birth, decreasing at P14, and then rising again.
  • Differential expression of these novel Shank3 transcripts was observed between wild-type and Mecp2-deficient mice, suggesting MeCP2-mediated regulation.

Conclusions:

  • The identified SHANK3 isoforms (Shank3c-3 and Shank3c-4) may play a role in synaptic abnormalities associated with neurodevelopmental disorders.
  • Epigenetic regulation by MeCP2 influences the expression of these novel SHANK3 transcripts.
  • These findings provide new insights into the molecular mechanisms underlying ASD and Rett syndrome.