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Exchange of molecular and cellular information: a hybrid model that integrates stem cell divisions and key regulatory interactions [w5C6]

ABSTRACT: We performed a transcriptome analysis on FACS-sorted GFP positive cells from pCYCD6;1-GFP, wox5xpCYCD6;1-GFP, and pWOX5-GFP, and the GFP negative cells from pWOX5-GFP to obtain CEI specific transcriptional profiles in a WT and in a wox5 mutant background.

ORGANISM(S): Arabidopsis thaliana

PROVIDER: GSE155463 | GEO | 2020/12/31

REPOSITORIES: GEO

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Exchange of molecular and cellular information: a hybrid model that integrates stem cell divisions and key regulatory interactions

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A hybrid model connecting regulatory interactions with stem cell divisions in the root.

Project description:Stem cells give rise to the entirety of cells within an organ. Maintaining stem cell identity and coordinately regulating stem cell divisions is crucial for proper development. In plants, mobile proteins, such as WUSCHEL-RELATED HOMEOBOX 5 (WOX5) and SHORTROOT (SHR), regulate divisions in the root stem cell niche. However, how these proteins coordinately function to establish systemic behaviour is not well understood. We propose a non-cell autonomous role for WOX5 in the cortex endodermis initial (CEI) and identify a regulator, ANGUSTIFOLIA (AN3)/GRF-INTERACTING FACTOR 1, that coordinates CEI divisions. Here, we show with a multi-scale hybrid model integrating ordinary differential equations (ODEs) and agent-based modeling that quiescent center (QC) and CEI divisions have different dynamics. Specifically, by combining continuous models to describe regulatory networks and agent-based rules, we model systemic behaviour, which led us to predict cell-type-specific expression dynamics of SHR, SCARECROW, WOX5, AN3 and CYCLIND6;1, and experimentally validate CEI cell divisions. Conclusively, our results show an interdependency between CEI and QC divisions.

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