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The activation of WASP constitutes a key pathway for actin filament nucleation. Yet, when WASP function is eliminated there is negligible effect on actin polymerization at the immunological synapse, leading to gaps in our understanding of the events connecting WASP and calcium ion signaling. Here, we identify a fraction of total synaptic F-actin selectively generated by WASP in the form of distinct F-actin \u2018foci\u2019. These foci are polymerized de novo as a result of the T cell receptor (TCR) proximal tyrosine kinase cascade, and facilitate distal signaling events including PLC\u03b31 activation and subsequent cytoplasmic calcium ion elevation. We conclude that WASP generates a dynamic F-actin architecture in the context of the immunological synapse, which then amplifies the downstream signals required for an optimal immune response.<\/jats:p>","DOI":"10.7554\/elife.04953","type":"journal-article","created":{"date-parts":[[2015,3,12]],"date-time":"2015-03-12T05:50:09Z","timestamp":1426139409000},"source":"Crossref","is-referenced-by-count":196,"title":["Actin foci facilitate activation of the phospholipase C-\u03b3 in primary T lymphocytes via the WASP pathway"],"prefix":"10.7554","volume":"4","author":[{"given":"Sudha","family":"Kumari","sequence":"first","affiliation":[{"name":"Skirball Institute of Biomolecular Medicine, New York University School of Medicine, New York, United States"},{"name":"David H. 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Koch Institute for Integrative Cancer research, Massachusetts Institute of Technology, Cambridge, United States"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lance C","family":"Kam","sequence":"additional","affiliation":[{"name":"Department of Biological Engineering, Columbia University, New York, United States"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christopher V","family":"Carman","sequence":"additional","affiliation":[{"name":"Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, United States"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Janis K","family":"Burkhardt","sequence":"additional","affiliation":[{"name":"Department of Pathology and Laboratory Medicine, Perelman School of Medicine, The Children's Hospital of Philadelphia, University of Pennsylvania, Philadelphia, United States"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Darrell J","family":"Irvine","sequence":"additional","affiliation":[{"name":"David H. 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