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Here, we show that LRP4 is also expressed by embryonic cortical and hippocampal neurons, and that downregulation of LRP4 in these neurons causes a reduction in density of synapses and number of primary dendrites. Accordingly, overexpression of LRP4 in cultured neurons had the opposite effect inducing more but shorter primary dendrites with an increased number of spines. Transsynaptic tracing mediated by rabies virus revealed a reduced number of neurons presynaptic to the cortical neurons in which LRP4 was knocked down. Moreover, neuron-specific knockdown of LRP4 by in utero electroporation of LRP4 miRNA in vivo also resulted in neurons with fewer primary dendrites and a lower density of spines in the developing cortex and hippocampus. Collectively, our results demonstrate an essential and novel role of neuronal LRP4 in dendritic development and synaptogenesis in the CNS.<\/jats:p>","DOI":"10.1242\/dev.150110","type":"journal-article","created":{"date-parts":[[2017,10,24]],"date-time":"2017-10-24T00:20:14Z","timestamp":1508804414000},"page":"4604-4615","source":"Crossref","is-referenced-by-count":27,"title":["Neuronal LRP4 regulates synapse formation in the developing CNS"],"prefix":"10.1242","volume":"144","author":[{"given":"Andromachi","family":"Karakatsani","sequence":"first","affiliation":[{"name":"Ludwig-Maximilians-University 1 Department of Physiological Genomics , , Grosshaderner Str. 9, D-82152 Planegg-Martinsried , Germany"},{"name":"Biochemistry Center (BZH), Heidelberg University 2 , 69120 Heidelberg , Germany"},{"name":"Interdisciplinary Center for Neurosciences, Heidelberg University 3 , 69120 Heidelberg , 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