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Molecular dissection of NRG1-ERBB4 signaling implicates PTPRZ1 as a potential schizophrenia susceptibility gene

Molecular Psychiatry volume 13, pages 162–172 (2008)Cite this article

Abstract

Neuregulin and the neuregulin receptor ERBB4 have been genetically and functionally implicated in schizophrenia. In this study, we used the yeast two-hybrid system to identify proteins that interact with ERBB4, to identify genes and pathways that might contribute to schizophrenia susceptibility. We identified the MAGI scaffolding proteins as ERBB4-binding proteins. After validating the interaction of MAGI proteins with ERBB4 in mammalian cells, we demonstrated that ERBB4 expression, alone or in combination with ERBB2 or ERBB3, led to the tyrosine phosphorylation of MAGI proteins, and that this could be further enhanced with receptor activation by neuregulin. As MAGI proteins were previously shown to interact with receptor phosphotyrosine phosphatase β/ζ (RPTPβ), we postulated that simultaneous binding of MAGI proteins to RPTPβ and ERBB4 forms a phosphotyrosine kinase/phosphotyrosine phosphatase complex. Studies in cultured cells confirmed both a spatial and functional association between ERBB4, MAGI and RPTPβ. Given the evidence for this functional association, we examined the genes coding for MAGI and RPTPβ for genetic association with schizophrenia in a Caucasian United Kingdom case–control cohort (n=∼1400). PTPRZ1, which codes for RPTPβ, showed significant, gene-wide and hypothesis-wide association with schizophrenia in our study (best individual single-nucleotide polymorphism allelic P=0.0003; gene-wide P=0.0064; hypothesis-wide P=0.026). The data provide evidence for a role of PTPRZ1, and for RPTPβ signaling abnormalities, in the etiology of schizophrenia. Furthermore, the data indicate a role for RPTPβ in the modulation of ERBB4 signaling that may in turn provide further support for an important role of neuregulin/ERBB4 signaling in the molecular basis of schizophrenia.

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Acknowledgements

This work was funded by an NIMH Silvio O Conte Centre For The Neuroscience of Mental Disorders Grant (MH063392 to JDB and KLD, PI and co-PI) and in part by grants from the MRC, UK (MRC and MO). VM is funded by a RCUK Fellowship and TS is a Fellow of the Seaver Foundation and is further supported by the Stanley Medical Research Institute (grant 06R-1427) and by a New York State Spinal Cord Injury Grant (SCIRB04-27). We thank Mihaela Gazdoiu and Kate Liberman for excellent technical assistance and Dr Andrew Chan for advice and guidance on the study of MAGI proteins.

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Authors and Affiliations

  1. Department of Psychiatry, Mount Sinai School of Medicine, New York, NY, USA

    J D Buxbaum, J J Young, C Plescia, Y Kajiwara, Y Jiang, K L Davis & T Sakurai

  2. Department of Neuroscience, Mount Sinai School of Medicine, New York, NY, USA

    J D Buxbaum, J J Young, C Plescia & Y Kajiwara

  3. Department of Human Genetics, Mount Sinai School of Medicine, New York, NY, USA

    J D Buxbaum

  4. Department of Psychological Medicine, School of Medicine, Cardiff University, Heath Park, Cardiff, UK

    L Georgieva, V Moskvina, N Norton, T Peirce, H Williams, N J Craddock, L Carroll, M J Owen & M C O'Donovan

  5. Department of Neurology, Neurobiology Program, Children's Hospital, Harvard Medical School, Boston, MA, USA

    G Corfas

  6. Département De Neuroscience, Institut Pasteur, Paris, France

    S Harroch

  7. Department of Pharmacology, Mount Sinai School of Medicine, New York, NY, USA

    T Sakurai

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  1. J D Buxbaum
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Buxbaum, J., Georgieva, L., Young, J. et al. Molecular dissection of NRG1-ERBB4 signaling implicates PTPRZ1 as a potential schizophrenia susceptibility gene. Mol Psychiatry 13, 162–172 (2008). https://doi.org/10.1038/sj.mp.4001991

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