Report

Translation of Polarity Cues into Asymmetric Spindle Positioning in Caenorhabditis elegans Embryos

Science  20 Jun 2003:
Vol. 300, Issue 5627, pp. 1957-1961
DOI: 10.1126/science.1084146

You are currently viewing the abstract.

View Full Text
As a service to the community, AAAS/Science has made this article free with registration.

Abstract

Asymmetric divisions are crucial for generating cell diversity; they rely on coupling between polarity cues and spindle positioning, but how this coupling is achieved is poorly understood. In one-cell stage Caenorhabditis elegans embryos, polarity cues set by the PAR proteins mediate asymmetric spindle positioning by governing an imbalance of net pulling forces acting on spindle poles. We found that the GoLoco-containing proteins GPR-1 and GPR-2, as well as the Gα subunits GOA-1 and GPA-16, were essential for generation of proper pulling forces. GPR-1/2 interacted with guanosine diphosphate-bound GOA-1 and were enriched on the posterior cortex in a par-3– and par-2–dependent manner. Thus, the extent of net pulling forces may depend on cortical Gα activity, which is regulated by anterior-posterior polarity cues through GPR-1/2.

View Full Text

Cited By...