DOF2.1 controls vascular cell proliferation downstream of TMO5/LHW
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ABSTRACT:
PROVIDER: PRJNA480449 | ENA |
REPOSITORIES: ENA
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Project description:As plant cells are fixed within their tissue context, a precise control of cell division orientation is crucial to generate complex three-dimensional organs. The transcription factor complex formed by TARGET OF MONOPTEROS5 (TMO5) and LONESOME HIGHWAY (LHW) triggers a change in cell division orientation leading to radial expansion, at least in part by activating local cytokinin biosynthesis. However, it remains unclear how cytokinin controls these oriented cell divisions. Here, we analyzed the transcriptional responses upon simultaneous induction of both TMO5 and LHW in detail. Using inferred network analysis, we identify AT2G28510/DOF2.1 as a cytokinin-dependent downstream target gene of the TMO5/LHW heterodimer complex. We further show that DOF2.1 is specifically required and sufficient for vascular cell proliferation without inducing other cytokinin-dependent effects such as the inhibition of vascular differentiation. In summary, we have identified DOF2.1 as a TMO5/LHW target gene, specifically responsible for controlling vascular cell proliferation leading to radial expansion.
2019-01-24 | GSE116858 | GEO
Project description:TFEB controls vascular development by regulating the proliferation of endothelial cells
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Project description:To create a three-dimensional structure, plants rely on oriented cell divisions and cell elongation. Oriented cell divisions are specifically important in procambium cells of the root to establish the different vascular cell types [1, 2]. These divisions are in part controlled by the auxin-controlled TARGET OF MONOPTEROS5 (TMO5) and LONESOME HIGHWAY (LHW) transcription factor complex [3-7]. Loss-of-function of tmo5 or lhw clade members results in strongly reduced vascular cell file numbers, whereas ectopic expression of both TMO5 and LHW can ubiquitously induce periclinal and radial cell divisions in all cell types of the root meristem. TMO5 and LHW interact only in young xylem cells, where they promote expression of two direct target genes involved in the final step of cytokinin (CK) biosynthesis, LONELY GUY3 (LOG3) and LOG4 [8, 9] Therefore, CK was hypothesized to act as a mobile signal from the xylem to trigger divisions in the neighboring procambium cells [3, 6]. To unravel how TMO5/LHW-dependent cytokinin regulates cell proliferation, we analyzed the transcriptional responses upon simultaneous induction of both transcription factors. Using inferred network analysis, we identified AT2G28510/DOF2.1 as a cytokinin-dependent downstream target gene. We further showed that DOF2.1 controls specific procambium cell divisions without inducing other cytokinin-dependent effects such as the inhibition of vascular differentiation. In summary, our results suggest that DOF2.1 and its closest homologs control vascular cell proliferation, thus leading to radial expansion of the root.
| S-EPMC6370950 | biostudies-literature
Project description:The final size and arrangement of the plant vasculature requires precise adjustment of cell proliferation. In particular, radial growth of vascular bundles is to a large extent controlled by a bHLH transcription factor heterodimer formed by TARGET OF MONOPTEROS5 (TMO5) and LONESOME HIGHWAY (LHW). Excess activity of this TMO5/LHW dimer causes excessive proliferation of vascular cell divisions and thus suggests the existence of a molecular mechanism that restricts its activity in space and time. Here we show that this overproliferation phenotype is similar to acaulis5 (acl5) mutants, suggesting a role for ACL5 in controlling TMO5/LHW activity. We further identify the clade of SAC51-LIKE (SACL) bHLH transcription factors whose translation is regulated by ACL5, as inhibitors of TMO5/LHW activity. We show that SACL proteins interact with LHW impairing activation of downstream targets and alleviating the overproliferation caused by TMO5/LHW misexpression. Given that transcription of SACL genes is induced by TMO5/LHW and its upstream trigger auxin, we propose that SACL proteins represent a feedback mechanism that limits activity of this pathway and controls periclinal cell divisions.
2015-09-01 | GSE70157 | GEO
Project description:The final size and arrangement of the plant vasculature requires precise adjustment of cell proliferation. In particular, radial growth of vascular bundles is to a large extent controlled by a bHLH transcription factor heterodimer formed by TARGET OF MONOPTEROS5 (TMO5) and LONESOME HIGHWAY (LHW). Excess activity of this TMO5/LHW dimer causes excessive proliferation of vascular cell divisions and thus suggests the existence of a molecular mechanism that restricts its activity in space and time. Here we show that this overproliferation phenotype is similar to acaulis5 (acl5) mutants, suggesting a role for ACL5 in controlling TMO5/LHW activity. We further identify the clade of SAC51-LIKE (SACL) bHLH transcription factors whose translation is regulated by ACL5, as inhibitors of TMO5/LHW activity. We show that SACL proteins interact with LHW impairing activation of downstream targets and alleviating the overproliferation caused by TMO5/LHW misexpression. Given that transcription of SACL genes is induced by TMO5/LHW and its upstream trigger auxin, we propose that SACL proteins represent a feedback mechanism that limits activity of this pathway and controls periclinal cell divisions. Three biological replicates were generated per sample. The goal of this experiment is to compare different genotypes that suppress the acl5 mutant as Columbia-0, acl5 + pHS::SACL3 and acl5 ajax2-31, against the acl5 mutant. Every pair of samples that were compared in the same array, were also growth in the same plate. The acl5 + pHS::SACL3 seedlings (and the acl5 ones against they are went compared) were treated to 37C degrees heat shock and then collected at the different times (30 and 210 min) after heat shock. In each comparison 1 or 2 or the replcates were reversed-labeled.
2015-09-01 | E-GEOD-70157 | biostudies-arrayexpress
Project description:Normal development requires tight regulation of cell proliferation and cell death. Here, we investigated these control mechanisms in the hyaloid vessels, a temporary vascular network in the mammalian eye that requires a Wnt/β-catenin response for scheduled regression. Transcriptome analysis of the postnatal day 5 mouse hyaloid showed expression of several Wnt pathway proteins. We investigated whether the hyaloid Wnt response was linked to the oncogene Myc, and the cyclin-dependent kinase inhibitor P21 (CDKN1A), both established regulators of cell cycle progression and cell death. Our analysis showed that the Wnt pathway coreceptors LRP5 and LRP6 have overlapping activities mediating the Wnt/β-catenin signaling in hyaloid vascular endothelial cells (VECs). We also showed that both Myc and Cdkn1a are downstream of the Wnt response and are required for hyaloid regression but for different reasons. Conditional deletion of Myc in VECs suppressed both proliferation and cell death. By contrast, conditional deletion of Cdkn1a resulted in VEC over-proliferation that countered the effects of cell death on regression. When combined with analysis of MYC, and P21 protein levels, this analysis suggests that a Wnt/β-catenin, MYC-P21 pathway regulates scheduled hyaloid vessel regression.
2018-06-15 | GSE113294 | GEO
Project description:Identification of regulators of vascular proliferation
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Project description:6 timepoints: Day 0 (normal controls), progressively developing neointimal vascular proliferation and pulmonary hypertension in vehicle treated animals (Days 14, 21, 28 and 35) and triptolide-treated animals at Day 35. Replicates: 6 for Day 0 (normal) 2 for Daty 14 3 each for Days 21, 28, 35 and Triptolide -treated at day 35 (T)
2010-06-05 | E-GEOD-843 | biostudies-arrayexpress