Interactions between the cell cycle and embryonic patterning in Arabidopsis uncovered by a mutation in DNA polymerase epsilon.
Pattern formation and morphogenesis require coordination of cell division rates and orientations with developmental signals that specify cell fate. A viable mutation in the TILTED1 locus, which encodes the catalytic subunit of DNA polymerase epsilon of Arabidopsis thaliana, causes a lengthening of the cell cycle by approximately 35% throughout embryo development and alters cell type patterning of the hypophyseal lineage in the root, leading to a displacement of the root pole from its normal position on top of the suspensor. Treatment of preglobular and early globular stages, but not later stage, embryos with the DNA polymerase inhibitor aphidicolin leads to a similar phenotype. The results uncover an interaction between the cell cycle and the processes that determine cell fate during plant embryogenesis.
Jenik
Pablo D
PD
Department of Plant Biology, Carnegie Institution, Stanford, California 94305, USA.
Jurkuta
Rebecca E J
RE
Barton
M Kathryn
MK
D000595:Amino Acid Sequence; D017360:Arabidopsis / Q000166:cytology / Q000196:embryology* / Q000201:enzymology; D001483:Base Sequence; D019521:Body Patterning; D002384:Catalysis; D002453:Cell Cycle; D003001:Cloning, Molecular; D004257:DNA Polymerase II / Q000737:chemistry / Q000235:genetics*; D017931:DNA Primers; D018744:DNA, Plant / Q000378:metabolism; D008969:Molecular Sequence Data; D009154:Mutation; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012639:Seeds / Q000254:growth & development* / Q000378:metabolism; D017386:Sequence Homology, Amino Acid
D017931:DNA Primers; D018744:DNA, Plant; D004257:DNA Polymerase II