A Novel Short Isoform of Cytosolic PSD-95 Interactor (Cypin) Regulates Neuronal Development

Mihir V. Patel, Przemyslaw Swiatkowski, Munjin Kwon, Ana R. Rodriguez, Keith Campagno, Bonnie Firestein-Miller

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


The guanine deaminase cypin (cytosolic PSD-95 interactor) binds to PSD-95 (postsynaptic density protein 95) and regulates dendrite branching by promoting microtubule polymerization. Here, we identify a novel short isoform of cypin, termed cypinS, which is expressed in mouse and human, but not rat, tissues. Cypin and cypinS mRNA and protein levels peak at P7 and P14 in the mouse brain, suggesting a role for these isoforms during development. Interestingly, although cypinS lacks guanine deaminase activity, overexpression of cypinS increases dendrite branching. This increase occurs further away from soma than do increases resulting from overexpression of cypin. In contrast, overexpression of cypin, but not cypinS, decreases dendritic spine density and maturity. This suggests that changes to spines, but not to dendrites, may be dependent on guanine deaminase activity. Furthermore, overexpression of either cypin or cypinS increases miniature excitatory postsynaptic current (mEPSC) frequency, pointing to a presynaptic role for both isoforms. Interestingly, overexpression of cypinS results in a significantly greater increase in frequency than does overexpression of cypin. Thus, cypin and cypinS play distinct roles in neuronal development.

Original languageEnglish (US)
Pages (from-to)6269-6281
Number of pages13
JournalMolecular Neurobiology
Issue number8
StatePublished - Aug 1 2018

All Science Journal Classification (ASJC) codes

  • Neurology
  • Cellular and Molecular Neuroscience


  • Cell culture
  • Cypin
  • Dendrite
  • Dendritic spine
  • Electrophysiology
  • Morphology
  • Neuron

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