Recurrent deletions of ULK4 in schizophrenia: a gene crucial for neuritogenesis and neuronal motility

Bing Lang, Jin Pu, Irene Hunter, Min Liu, Christina Martin-Granados, Thomas J Reilly, Guo-Dong Gao, Zhen-Long Guan, Wei-Dong Li, Yong-Yong Shi, Guang He, Lin He, Hreinn Stefansson, David St Clair, Douglas H Blackwood, Colin D McCaig, Sanbing Shen

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Abstract

Although many pathogenic copy number variations (CNVs) are associated with neuropsychiatric diseases, few of them have been functionally characterised. Here we report multiple schizophrenia cases with CNV abnormalities specific to unc-51-like kinase 4 (ULK4), a serine/threonine kinase gene. Deletions spanning exons 21–34 of ULK4 were present in 4 out of 3391 schizophrenia patients from the International Schizophrenia Consortium, but absent in 3181 controls. Deletions removing exons 33 and 34 of the large splice variant of ULK4 also were enriched in Icelandic schizophrenia and bipolar patients compared with 98,022 controls (P = 0.0007 for schizophrenia plus bipolar disorder). Combining the two cohorts gives a P-value less than 0.0001 for schizophrenia, or for schizophrenia plus bipolar disorder. The expression of ULK4 is neuron-specific and developmentally regulated. ULK4 modulates multiple signalling pathways that include ERK, p38, PKC and JNK, which are involved in stress responses and implicated in schizophrenia. Knockdown of ULK4 disrupts the composition of microtubules and compromises neuritogenesis and cell motility. Targeted Ulk4 deletion causes corpus callosum agenesis in mice. Our findings indicate that ULK4 is a rare susceptibility gene for schizophrenia.
Original languageEnglish
Pages (from-to)630-640
Number of pages11
JournalJournal of Cell Science
Volume127
Issue number3
Early online date27 Nov 2013
DOIs
Publication statusPublished - 1 Feb 2014

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Keywords

  • neurite branching
  • schizophrenia
  • serine/threonine kinase
  • ULK4

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