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Phospho-tyrosine proteomic analysis in Ptprd-meB+/– mice

ABSTRACT: PTPδ, encoded by PTPRD, is implicated in various neurological, psychiatric, and neurodevelopmental disorders, but the underlying mechanisms remain unclear. PTPδ trans-synaptically interacts with multiple postsynaptic adhesion molecules, which involves its extracellular alternatively spliced mini-exons, meA and meB. While PTPδ-meA functions have been studied in vivo, PTPδ-meB has not been studied. Here, we report that, unlike homozygous PTPδ-meA-mutant mice, homozygous PTPδ-meB-mutant (Ptprd-meB–/–) mice show markedly reduced early postnatal survival. Heterozygous Ptprd-meB+/– male mice show behavioral abnormalities and decreased excitatory synaptic density and transmission in dentate gyrus granule cells (DG-GCs). Proteomic analyses identify decreased postsynaptic density levels of IL1RAP, a known trans-synaptic partner of meB-containing PTPδ. Accordingly, IL1RAP-mutant mice show decreased excitatory synaptic transmission in DG-GCs. Ptprd-meB+/– DG interneurons with minimal IL1RAP expression show increased excitatory synaptic density and transmission. Therefore, PTPδ-meB is important for survival, synaptic, and behavioral phenotypes and regulates excitatory synapses in cell-type-specific and IL1RAP-dependent manners.

INSTRUMENT(S): Orbitrap Fusion

ORGANISM(S): Mus Musculus (mouse)

TISSUE(S): Brain

SUBMITTER: Yeji Yang

LAB HEAD: Jin Young

PROVIDER: PXD053554 | Pride | 2025-04-01

REPOSITORIES: Pride

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			Action	DRS
	1615_220707_37326_AS_L.pep.xml	Pepxml
	1616_220707_37327_AS_L.pep.xml	Pepxml
	1617_220707_37328_AS_L.pep.xml	Pepxml
	1618_220707_37329_AS_L.pep.xml	Pepxml
	1619_220707_37330_AS_L.pep.xml	Pepxml

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Alternatively spliced mini exon B in PTPRD regulates hippocampal excitatory synapses through trans synaptic PTPRD IL1RAP interaction

Project description:PTP?, encoded by PTPRD, is implicated in various neurological, psychiatric, and neurodevelopmental disorders, but the underlying mechanisms remain unclear. PTP? trans-synaptically interacts with multiple postsynaptic adhesion molecules, which involves its extracellular alternatively spliced mini-exons, meA and meB. While PTP?-meA functions have been studied in vivo, PTP?-meB has not been studied. Here, we report that, unlike homozygous PTP?-meA-mutant mice, homozygous PTP?-meB-mutant (Ptprd-meB–/–) mice show markedly reduced early postnatal survival. Heterozygous Ptprd-meB+/– male mice show behavioral abnormalities and decreased excitatory synaptic density and transmission in dentate gyrus granule cells (DG-GCs). Proteomic analyses identify decreased postsynaptic density levels of IL1RAP, a known trans-synaptic partner of meB-containing PTP?. Accordingly, IL1RAP-mutant mice show decreased excitatory synaptic transmission in DG-GCs. Ptprd-meB+/– DG interneurons with minimal IL1RAP expression show increased excitatory synaptic density and transmission. Therefore, PTP?-meB is important for survival, synaptic, and behavioral phenotypes and regulates excitatory synapses in cell-type-specific and IL1RAP-dependent manners.

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