Rac1 function during fucoid development.
Morphogenesis in fucoid algae begins with adhesive secretion and rhizoid germination, developmental events that secure the alga within the intertidal zone. The importance of the actin cytoskeleton during these processes has been well established; but in general, little is known about actin regulation within the stramenopile lineage. Based on conserved strategies for regulation of actin in other lineages, co-localization of the Arp2/3 complex with actin structures that are essential for rhizoid formation may implicate members of the Rho family of small GTPases in the signaling pathway(s) regulating actin polymerization during fucoid development. Our lab recently demonstrated Rac1 dependent regulation of endomembrane polarization, polarization of adhesive secretion, germination and tip growth in the fucoid brown alga Silvetia compressa. We also present new evidence revealing Rac1 localization during germination in S. compressa, and show that membrane localization is essential for proper Rac1 function.
Muzzy
Rachel A
RA
University of Massachusetts Dartmouth; Department of Biology; North Dartmouth, Massachusetts USA.
Hable
Whitney E
WE
Adv Morphog. 1968;7:295-328
4881309
Curr Opin Plant Biol. 2006 Dec;9(6):579-88
17010659
Plant Cell. 1997 Jul;9(7):1011-1020
12237373
Semin Cell Dev Biol. 2001 Oct;12(5):345-51
11535041
BMC Plant Biol. 2006 Feb 23;6:5
16504093
Trends Plant Sci. 1999 Dec;4(12):490-494
10562734
Planta. 2008 Apr;227(5):991-1000
18183417
Dev Biol. 1998 Jun 1;198(1):45-56
9640331
Cell Motil Cytoskeleton. 2005 May;61(1):9-20
15776461
Trends Cell Biol. 2006 Oct;16(10):522-9
16949823
Proc Natl Acad Sci U S A. 1995 Apr 11;92(8):3333-7
7536929
Protoplasma. 2003 Jun;221(3-4):193-204
12802626
Proc Natl Acad Sci U S A. 2004 May 18;101(20):7618-23
15128949
Nature. 2002 Dec 12;420(6916):629-35
12478284
Dev Biol. 2000 Jun 15;222(2):440-9
10837131
Development. 1999 Jan;126(1):201-9
9834199
Planta. 2004 Sep;219(5):856-66
15197592
Planta. 2001 Apr;212(5-6):648-58
11346938