1. Variants in LRRC7 lead to intellectual disability, autism, aggression and abnormal eating behaviors
- Author
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Jana Willim, Daniel Woike, Daniel Greene, Sarada Das, Kevin Pfeifer, Weimin Yuan, Anika Lindsey, Omar Itani, Amber L. Böhme, Debora Tibbe, Hans-Hinrich Hönck, Fatemeh Hassani Nia, Undiagnosed Diseases Network, Michael Zech, Theresa Brunet, Laurence Faivre, Arthur Sorlin, Antonio Vitobello, Thomas Smol, Cindy Colson, Kristin Baranano, Krista Schatz, Allan Bayat, Kelly Schoch, Rebecca Spillmann, Erica E. Davis, Erin Conboy, Francesco Vetrini, Konrad Platzer, Sonja Neuser, Janina Gburek-Augustat, Alexandra Noel Grace, Bailey Mitchell, Alexander Stegmann, Margje Sinnema, Naomi Meeks, Carol Saunders, Maxime Cadieux-Dion, Juliane Hoyer, Julien Van-Gils, Jean-Madeleine de Sainte-Agathe, Michelle L. Thompson, E. Martina Bebin, Monika Weisz-Hubshman, Anne-Claude Tabet, Alain Verloes, Jonathan Levy, Xenia Latypova, Sönke Harder, Gary A. Silverman, Stephen C. Pak, Tim Schedl, Kathleen Freson, Andrew Mumford, Ernest Turro, Christian Schlein, Vandana Shashi, and Hans-Jürgen Kreienkamp
- Subjects
Science - Abstract
Abstract Members of the leucine rich repeat (LRR) and PDZ domain (LAP) protein family are essential for animal development and histogenesis. Densin-180, encoded by LRRC7, is the only LAP protein selectively expressed in neurons. Densin-180 is a postsynaptic scaffold at glutamatergic synapses, linking cytoskeletal elements with signalling proteins such as the α-subunit of Ca2+/calmodulin-dependent protein kinase II. We have previously observed an association between high impact variants in LRRC7 and Intellectual Disability; also three individual cases with variants in LRRC7 had been described. We identify here 33 individuals (one of them previously described) with a dominant neurodevelopmental disorder due to heterozygous missense or loss-of-function variants in LRRC7. The clinical spectrum involves intellectual disability, autism, ADHD, aggression and, in several cases, hyperphagia-associated obesity. A PDZ domain variant interferes with synaptic targeting of Densin-180 in primary cultured neurons. Using in vitro systems (two hybrid, BioID, coimmunoprecipitation of tagged proteins from 293T cells) we identified new candidate interaction partners for the LRR domain, including protein phosphatase 1 (PP1), and observed that variants in the LRR reduced binding to these proteins. We conclude that LRRC7 encodes a major determinant of intellectual development and behaviour.
- Published
- 2024
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