Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 118, Issue 6, Pages -Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.2005256118
Keywords
cell cycle; root meristem; Arabidopsis
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Funding
- National Scientific and Technical Research Council (CONICET)
- Agencia Nacional de Promocion de la Investigacion, el Desarrollo Tecnologico y la Innovacion (ANPCyT)
- Research Foundation Flanders [G010820N]
- ANPCyT [PICT2015-3758, PICT2017-2762]
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Gene expression is rapidly reconfigured during the cell cycle to carry out specific cellular functions for each phase. The use of fluorescence-activated cell sorting allowed for analysis of gene expression profile in G2/M cells in the growing root and identification of key regulatory factors. SCL28, a transcription factor, was found to play a crucial role in promoting progression through G2/M and modulating cell division plane selection.
Gene expression is reconfigured rapidly during the cell cycle to execute the cellular functions specific to each phase. Studies conducted with synchronized plant cell suspension cultures have identified hundreds of genes with periodic expression patterns across the phases of the cell cycle, but these results may differ from expression occurring in the context of intact organs. Here, we describe the use of fluorescence-activated cell sorting to analyze the gene expression profile of G2/M cells in the growing root. To this end, we isolated cells expressing the early mitosis cell cycle marker CYCLINB1;1-GFP from Arabidopsis root tips. Transcriptome analysis of these cells allowed identification of hundreds of genes whose expression is reduced or enriched in G2/M cells, including many not previously reported from cell suspension cultures. From this dataset, we identified SCL28, a transcription factor belonging to the GRAS family, whose messenger RNA accumulates to the highest levels in G2/M and is regulated by MYB3R transcription factors. Functional analysis indicates that SCL28 promotes progression through G2/M and modulates the selection of cell division planes.
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