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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

G proteins are required for spatial orientation of early cell cleavages in C. elegans embryos.

Heterotrimeric G proteins are signal-transducing molecules activated by seven transmembrane domain receptors. In C. elegans, gpb-1 encodes the sole Gbeta subunit; therefore, its inactivation should affect all heterotrimeric G protein signaling. When maternal but no zygotic gpb-1 protein (GPB-1) is present, development proceeds until the first larval stage, but these larvae show little muscle activity and die soon after hatching. When, however, the maternal contribution of GPB-1 is also reduced, spindle orientations in early cell divisions are randomized. Cell positions in these embryos are consequently abnormal, and the embryos die with the normal number of cells and well-differentiated but abnormally distributed tissues. These results indicate that maternal G proteins are important for orientation of early cell division axes, possibly by coupling a membrane signal to centrosome position.[1]

References

  1. G proteins are required for spatial orientation of early cell cleavages in C. elegans embryos. Zwaal, R.R., Ahringer, J., van Luenen, H.G., Rushforth, A., Anderson, P., Plasterk, R.H. Cell (1996) [Pubmed]
 
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