Distinct roles for Galpha and Gbetagamma in regulating spindle position and orientation in Caenorhabditis elegans embryos.

Abstract:

:Correct placement and orientation of the mitotic spindle is essential for segregation of localized components and positioning of daughter cells. Although these processes are important in many cells, few factors that regulate spindle placement are known. Previous work has shown that GPB-1, the Gbeta subunit of a heterotrimeric G protein, is required for orientation of early cell division axes in C. elegans embryos. Here we show that GOA-1 (a Galphao) and the related GPA-16 are the functionally redundant Galpha subunits and that GPC-2 is the relevant Ggamma subunit that is required for spindle orientation in the early embryo. We show that Galpha and Gbetagamma are involved in controlling distinct microtubule-dependent processes. Gbetagamma is important in regulating migration of the centrosome around the nucleus and hence in orientating the mitotic spindle. Galpha is required for asymmetric spindle positioning in the one-celled embryo.

journal_name

Nat Cell Biol

journal_title

Nature cell biology

authors

Gotta M,Ahringer J

doi

10.1038/35060092

keywords:

subject

Has Abstract

pub_date

2001-03-01 00:00:00

pages

297-300

issue

3

eissn

1465-7392

issn

1476-4679

journal_volume

3

pub_type

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