Splice-dependent trans-synaptic PTPδ–IL1RAPL1 interaction regulates synapse formation and non-REM sleep

Haram Park, Yeonsoo Choi, Hwajin Jung, Seoyeong Kim, Suho Lee, Hyemin Han, Hanseul Kweon, Suwon Kang, Woong Seob Sim, Frank Koopmans, Esther Yang, Hyun Kim, August B. Smit, Yong Chul Bae, Eunjoon Kim

Research output: Contribution to journalArticlepeer-review

Abstract

Alternative splicing regulates trans-synaptic adhesions and synapse development, but supporting in vivo evidence is limited. PTPδ, a receptor tyrosine phosphatase adhering to multiple synaptic adhesion molecules, is associated with various neuropsychiatric disorders; however, its in vivo functions remain unclear. Here, we show that PTPδ is mainly present at excitatory presynaptic sites by endogenous PTPδ tagging. Global PTPδ deletion in mice leads to input-specific decreases in excitatory synapse development and strength. This involves tyrosine dephosphorylation and synaptic loss of IL1RAPL1, a postsynaptic partner of PTPδ requiring the PTPδ-meA splice insert for binding. Importantly, PTPδ-mutant mice lacking the PTPδ-meA insert, and thus lacking the PTPδ interaction with IL1RAPL1 but not other postsynaptic partners, recapitulate biochemical and synaptic phenotypes of global PTPδ-mutant mice. Behaviorally, both global and meA-specific PTPδ-mutant mice display abnormal sleep behavior and non-REM rhythms. Therefore, alternative splicing in PTPδ regulates excitatory synapse development and sleep by modulating a specific trans-synaptic adhesion.

Original languageEnglish
Article numbere104150
JournalEMBO Journal
Volume39
Issue number11
DOIs
Publication statusPublished - 2020 Jun 2

Keywords

  • alternative splicing
  • receptor tyrosine phosphatase
  • sleep behavior and rhythm
  • synapse development
  • synaptic adhesion

ASJC Scopus subject areas

  • Neuroscience(all)
  • Molecular Biology
  • Biochemistry, Genetics and Molecular Biology(all)
  • Immunology and Microbiology(all)

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