UNC-6 (netrin) stabilizes oscillatory clustering of the UNC-40 (DCC) receptor to orient polarity.
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The receptor deleted in colorectal cancer (DCC) directs dynamic polarizing activities in animals toward its extracellular ligand netrin. How DCC polarizes toward netrin is poorly understood. By performing live-cell imaging of the DCC orthologue UNC-40 during anchor cell invasion in Caenorhabditis elegans, we have found that UNC-40 clusters, recruits F-actin effectors, and generates F-actin in the absence of UNC-6 (netrin). Time-lapse analyses revealed that UNC-40 clusters assemble, disassemble, and reform at periodic intervals in different regions of the cell membrane. This oscillatory behavior indicates that UNC-40 clusters through a mechanism involving interlinked positive (formation) and negative (disassembly) feedback. We show that endogenous UNC-6 and ectopically provided UNC-6 orient and stabilize UNC-40 clustering. Furthermore, the UNC-40-binding protein MADD-2 (a TRIM family protein) promotes ligand-independent clustering and robust UNC-40 polarization toward UNC-6. Together, our data suggest that UNC-6 (netrin) directs polarized responses by stabilizing UNC-40 clustering. We propose that ligand-independent UNC-40 clustering provides a robust and adaptable mechanism to polarize toward netrin.
Caenorhabditis elegans Proteins
Cell Adhesion Molecules
Intracellular Signaling Peptides and Proteins
Nerve Tissue Proteins
Published Version (Please cite this version)10.1083/jcb.201405026
Publication InfoWang, Zheng; Linden, Lara M; Naegeli, Kaleb M; Ziel, Joshua W; Chi, Qiuyi; Hagedorn, Elliott J; ... Sherwood, David R (2014). UNC-6 (netrin) stabilizes oscillatory clustering of the UNC-40 (DCC) receptor to orient polarity. J Cell Biol, 206(5). pp. 619-633. 10.1083/jcb.201405026. Retrieved from https://hdl.handle.net/10161/9026.
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Jerry G. and Patricia Crawford Hubbard Professor
Our research is directed at elucidating mechanisms underlying morphogenetic processes in development. We primarily use the model system C. elegans in our research, and combine powerful genetic and systems biology approaches with live-cell imaging to address three main topics: Tissue Remodeling and ConnectionA major focus of the lab is the understanding of mechanisms underlying uterine-vulval attachment. A key aspect of this process is t
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