The knock-out of ARP3a gene affects F-actin cytoskeleton organization altering cellular tip growth, morphology and development in moss Physcomitrella patens.

Details

Serval ID
serval:BIB_DF74AED0BAAE
Type
Article: article from journal or magazin.
Collection
Publications
Title
The knock-out of ARP3a gene affects F-actin cytoskeleton organization altering cellular tip growth, morphology and development in moss Physcomitrella patens.
Journal
Cell Motility and the Cytoskeleton
Author(s)
Finka A., Saidi Y., Goloubinoff P., Neuhaus J.M., Zrÿd J.P., Schaefer D.G.
ISSN
1097-0169[electronic], 0886-1544[linking]
Publication state
Published
Issued date
2008
Volume
65
Number
10
Pages
769-784
Language
english
Abstract
The seven subunit Arp2/3 complex is a highly conserved nucleation factor of actin microfilaments. We have isolated the genomic sequence encoding a putative Arp3a protein of the moss Physcomitrella patens. The disruption of this ARP3A gene by allele replacement has generated loss-of-function mutants displaying a complex developmental phenotype. The loss-of function of ARP3A gene results in shortened, almost cubic chloronemal cells displaying affected tip growth and lacking differentiation to caulonemal cells. In moss arp3a mutants, buds differentiate directly from chloronemata to form stunted leafy shoots having differentiated leaves similar to wild type. Yet, rhizoids never differentiate from stem epidermal cells. To characterize the F-actin organization in the arp3a-mutated cells, we disrupted ARP3A gene in the previously described HGT1 strain expressing conditionally the GFP-talin marker. In vivo observation of the F-actin cytoskeleton during P. patens development demonstrated that loss-of-function of Arp3a is associated with the disappearance of specific F-actin cortical structures associated with the establishment of localized cellular growth domains. Finally, we show that constitutive expression of the P. patens Arp3a and its Arabidopsis thaliana orthologs efficiently complement the mutated phenotype indicating a high degree of evolutionary conservation of the Arp3 function in land plants.
Keywords
Actins/chemistry, Actins/metabolism, Base Sequence, Bryopsida/cytology, Bryopsida/genetics, Cell Migration Assays, Cells, Cultured, Cytoskeleton/metabolism, Green Fluorescent Proteins/genetics, Microfilament Proteins/genetics, Molecular Sequence Data, Mutation, Phenotype, Phylogeny, Plant Proteins/genetics, Protein Subunits/genetics, Reverse Transcriptase Polymerase Chain Reaction
Pubmed
Web of science
Create date
10/07/2008 10:48
Last modification date
20/08/2019 17:03
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