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Temporal and spatial frameworks supporting plant responses to vegetation proximity

ABSTRACT: Temporal and spatial frameworks supporting plant responses to vegetation proximity

PROVIDER: PRJNA1114076 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR29108961_1.fastq.gz	Fastqsanger.gz
	SRR29108961_2.fastq.gz	Fastqsanger.gz
	SRR29108962_1.fastq.gz	Fastqsanger.gz
	SRR29108962_2.fastq.gz	Fastqsanger.gz
	SRR29108963_1.fastq.gz	Fastqsanger.gz

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Temporal and spatial frameworks supporting plant responses to vegetation proximity

Project description:After perception of vegetation proximity by the phytochrome photoreceptors, shade-avoider plants initiate a set of responses known as the Shade Avoidance Syndrome (SAS). Shade perception by the phytochrome B (phyB) photoreceptor unleashes the PHYTOCHROME INTERACTING FACTORs (PIFs) and initiates SAS responses. In Arabidopsis thaliana seedlings, shade perception involves rapid and massive changes in gene expression, increases auxin production and promotes hypocotyl elongation. Other components, such as phyA and ELONGATED HYPOCOTYL 5 (HY5), also participate in the shade regulation of the hypocotyl elongation response by repressing it. However, it remains unclear why and how so many regulators with either positive or negative activities modulate the same response. Our physiological, genetic, cellular and transcriptomic analyses showed that (1) these components are organized in two main branches or modules (phyA/HY5 and PIFs/HFR1/SAV3) and (2) the connection between them is dynamic and changes with the time of shade exposure. We propose a model for the regulation of shade-induced hypocotyl elongation in which the temporal and spatial functional importance of the various SAS regulators analyzed in here helps to explain the co-existence of differentiated regulatory branches with overlapping activities. Despite the temporal differences observed between phyA, HY5 and PIFs/HFR1/SAV3, their activities overlap and eventually converge in controlling hypocotyl elongation. Hence, we aimed to further investigate possible convergence points between these two groups of regulators.To expand our understanding of the role and interaction of HY5 and PIF4, PIF5 and PIF7 (PIF457) activities, we carried out RNA sequencing (RNA-seq) of seedlings exposed to different times of shade exposure of four genotypes: wild-type (Col-0), the single mutant hy5, the triple pif457 and the quadruple hy5 pif457.

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Project description:Proximity sequencing (Prox-seq) is a method that can simultaneously measure gene expression, protein abundance and protein complex information in single cells. By making use of proximity information from proteins, Prox-seq can infer surface protein complexes at the single-cell level. Previously, we proposed a statistical method for predicting protein complex abundance in single cells from Prox-seq data. However, it is difficult to experimentally validate the prediction results. Here, we first introduces a physical model which enables simulation of Prox-seq data. The simulated data is then used to validate the statistical method that we proposed previously, and to understand how protein abundance can influence protein complex prediction. Second, we propose a modification to Prox-seq, and use the new measurements from the modification to develop a second, independent method for predicting protein complexes. We demonstrate that on experimental data, the two methods generally agree with each other, with the second method generally producing more accurate protein complex abundance results. Thus, we present a simple way to investigate the behavior of Prox-seq data under various biological conditions, and independent methods for predicting and quantifying protein complexes.

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