Choosing sides: establishment of polarity in zygotes of fucoid algae.

The acquisition and expression of polarity during early embryogenesis underlies developmental pattern. In many multicellular organisms an initial asymmetric division of the zygote is critical to the determination of different cell fates of the early embryonic cells. Zygotes of the marine fucoid algae are initially apolar and become polarized in response to external cues. This results in an initial asymmetric division of the zygote. Subsequent divisions occur in a highly ordered spatial and temporal pattern. A combination of cell biological and biochemical studies is providing new details, and some controversies concerning the mechanisms by which zygotic polarity is acquired and amplified. Here, we discuss some of the more recent studies that are allowing improved understanding of polarization in this system.

[1]  M. Kirschner,et al.  Mitosis in transition , 1994, Cell.

[2]  R. Quatrano,et al.  Sulfation of fucoidin in Fucus embryos. IV. Autoradiographic investigations of fucoidin sulfation and secretion during differentiation and the effect of cytochalasin treatment. , 1979, Developmental biology.

[3]  D. Kropf.  Induction of Polarity in Fucoid Zygotes. , 1997, The Plant cell.

[4]  R. Quatrano,et al.  Polarity: the role of localized secretion. , 2000, Current opinion in plant biology.

[5]  C. Sardet,et al.  The sperm entry point defines the orientation of the calcium-induced contraction wave that directs the first phase of cytoplasmic reorganization in the ascidian egg. , 1995, Development.

[6]  J. Feijó,et al.  Pollen Tube Growth and the Intracellular Cytosolic Calcium Gradient Oscillate in Phase while Extracellular Calcium Influx Is Delayed. , 1997, The Plant cell.

[7]  R. Quatrano,et al.  Plant cell morphogenesis: plasma membrane interactions with the cytoskeleton and cell wall. , 1997, Annual review of cell and developmental biology.

[8]  A. Trewavas,et al.  Ca2+ and Calmodulin Dynamics during Photopolarization in Fucus serratus Zygotes , 1997, Plant physiology.

[9]  Paul Nurse,et al.  Ordering S phase and M phase in the cell cycle , 1994, Cell.

[10]  D. Schaefer.  Gene targeting in Physcomitrella patens. , 2001, Current opinion in plant biology.

[11]  K. Robinson,et al.  Cortical actin filaments form rapidly during photopolarization and are required for the development of calcium gradients in Pelvetia compressa zygotes. , 2000, Developmental biology.

[12]  Pattern formation in plant embryogenesis: a reassessment. , 1998, Seminars in cell & developmental biology.

[13]  D. Drubin,et al.  Functional cooperation between the microtubule and actin cytoskeletons. , 2000, Current opinion in cell biology.

[14]  S L Shaw,et al.  The role of targeted secretion in the establishment of cell polarity and the orientation of the division plane in Fucus zygotes. , 1996, Development.

[15]  Andrew L. Miller,et al.  Calcium buffer injections block fucoid egg development by facilitating calcium diffusion. , 1989, Proceedings of the National Academy of Sciences of the United States of America.

[16]  R. Quatrano,et al.  Polar localization of a dihydropyridine receptor on living Fucus zygotes. , 1996, Journal of cell science.

[17]  J. Blow,et al.  Cell cycle control of replication initiation in eukaryotes. , 1996, Current opinion in cell biology.

[18]  C. Brownlee,et al.  Elemental propagation of calcium signals in response-specific patterns determined by environmental stimulus strength. , 2000, Proceedings of the National Academy of Sciences of the United States of America.

[19]  The Egg Cell: Development and Role in Fertilization and Early Embryogenesis. , 1993, The Plant cell.

[20]  M. Messerli,et al.  Tip localized Ca2+ pulses are coincident with peak pulsatile growth rates in pollen tubes of Lilium longiflorum. , 1997, Journal of cell science.

[21]  F. Berger,et al.  Photopolarization of the Fucus sp. Zygote by Blue Light Involves a Plasma Membrane Redox Chain , 1994, Plant physiology.

[22]  C. Brownlee,et al.  Inhibition of the establishment of zygotic polarity by protein tyrosine kinase inhibitors leads to an alteration of embryo pattern in Fucus. , 2000, Developmental biology.

[23]  K. Robinson,et al.  The coupling of cyclic GMP and photopolarization of Pelvetia zygotes. , 1997, Developmental biology.

[24]  M. Gaestel,et al.  Heat Shock Protein 27 Is a Substrate of cGMP-dependent Protein Kinase in Intact Human Platelets , 2001, The Journal of Biological Chemistry.

[25]  R. Quatrano,et al.  Localization of Actin mRNA during the Establishment of Cell Polarity and Early Cell Divisions in Fucus Embryos. , 1996, The Plant cell.

[26]  Y. Jan,et al.  Polarity in Cell Division What Frames Thy Fearful Asymmetry? , 2000, Cell.

[27]  K. Robinson,et al.  Cytoplasmic calcium gradients and calmodulin in the early development of the fucoid alga Pelvetia compressa. , 1998, Journal of cell science.

[28]  A. Hetherington,et al.  Specificity and integration of responses: Ca2+ as a signal in polarity and osmotic regulation. , 1999 .

[29]  D. Cove,et al.  Mosses as model systems , 1997 .

[30]  C. Brownlee,et al.  Cell Cycle in the Fucus Zygote Parallels a Somatic Cell Cycle but Displays a Unique Translational Regulation of Cyclin-Dependent Kinases , 2001, Plant Cell.

[31]  E. O’Shea,et al.  The ins and outs of cell-polarity decisions , 2000, Nature Cell Biology.

[32]  P. Gualtieri,et al.  Retinal identification in Pelvetia fastigiata. , 1998, Biochemical and biophysical research communications.

[33]  R. Quatrano,et al.  Role of the cell wall in the determination of cell polarity and the plane of cell division in Fucus embryos , 1997 .

[34]  S. Bisgrove,et al.  Establishing a growth axis in fucoid algae. , 1999, Trends in plant science.

[35]  J. R. Wood,et al.  Spatial Organization of Calcium Signaling Involved in Cell Volume Control in the Fucus Rhizoid. , 1996, The Plant cell.

[36]  S. Gilroy,et al.  Root hair growth in Arabidopsis thaliana is directed by calcium and an endogenous polarity , 1997, Planta.

[37]  C. Brownlee,et al.  Regulation of channel activity underlying cell volume and polarity signals in Fucus. , 1997, Journal of experimental botany.

[38]  C. Brownlee,et al.  Polarity determination in Fucus: from zygote to multicellular embryo. , 1998, Seminars in cell & developmental biology.

[39]  F. Berger,et al.  Ratio confocal imaging of free cytoplasmic calcium gradients in polarising and polarised Fucus zygotes , 1993, Zygote.

[40]  L. Jaffe.  Tropistic responses of zygotes of the Fucaceae to polarized light. , 1958, Experimental cell research.

[41]  Lewis Wolpert,et al.  Principles of Development , 1997 .

[42]  C. Brownlee.  Tansley Review No. 70 Signal transduction during fertilization in algae and vascular plants , 1994 .

[43]  M. Fechheimer,et al.  The structure, function, and assembly of actin filament bundles. , 1997, International review of cytology.

[44]  D. Kropf,et al.  Sperm entry induces polarity in fucoid zygotes. , 2000, Development.

[45]  L. Alessa,et al.  F-actin marks the rhizoid pole in living Pelvetia compressa zygotes. , 1999, Development.

[46]  L. Meijer,et al.  A S/M DNA replication checkpoint prevents nuclear and cytoplasmic events of cell division including centrosomal axis alignment and inhibits activation of cyclin-dependent kinase-like proteins in fucoid zygotes. , 2000, Development.