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Related Concept Videos

Transcription01:10

Transcription

138.2K
Overview
Transcription is the process of synthesizing RNA from a DNA sequence by RNA polymerase. It is the first step in producing a protein from a gene sequence. Additionally, many other proteins and regulatory sequences are involved in the proper synthesis of messenger RNA (mRNA). Regulation of transcription is responsible for the differentiation of all the different types of cells and often for the proper cellular response to environmental signals.
Transcription Can Produce Different Kinds...
138.2K
Short-distance Transport of Resources02:12

Short-distance Transport of Resources

14.5K
Short-distance transport refers to transport that occurs over a distance of just 2-3 cells, crossing the plasma membrane in the process. Small uncharged molecules, such as oxygen, carbon dioxide, and water, can diffuse across the plasma membrane on their own. In contrast, ions and larger molecules require the assistance of transport proteins due to their charge or size. Transport across membranes also occurs within individual cells, playing a variety of essential roles for the plant as a whole.
14.5K
Key Elements for Plant Nutrition02:35

Key Elements for Plant Nutrition

17.9K
Like all living organisms, plants require organic and inorganic nutrients to survive, reproduce, grow and maintain homeostasis. To identify nutrients that are essential for plant functioning, researchers have leveraged a technique called hydroponics. In hydroponic culture systems, plants are grown—without soil—in water-based solutions containing nutrients. At least 17 nutrients have been identified as essential elements required by plants. Plants acquire these elements from the...
17.9K
Overview of Metabolism01:40

Overview of Metabolism

25.7K
Living cells constantly carry out various chemical reactions which are necessary for their proper functioning. These reactions are interlinked to one another via multiple pathways. The collection of these chemical reactions is known as metabolism.
Plant Metabolism
Sunlight, the primary source of energy in plants, is first absorbed by the chlorophyll pigments present in their leaves. Plants then use this energy to carry out photosynthesis, where water is oxidized into oxygen and carbon dioxide...
25.7K
Nonlinear Pharmacokinetics: Michaelis-Menten Equation01:18

Nonlinear Pharmacokinetics: Michaelis-Menten Equation

1.4K
The Michaelis–Menten equation is a fundamental model for describing capacity-limited kinetics in drug metabolism. It offers insights into the rate of decline of plasma drug concentration Cp over time, with Vmax and KM as pivotal parameters.
Vmax represents the maximum achievable process rate, while KM, known as the Michaelis constant, signifies the drug concentration at which the process rate reaches half its maximum. This relationship between Vmax, KM, and Cp gives rise to three distinct...
1.4K
Stringent Response in E. coli01:23

Stringent Response in E. coli

528
Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...
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Related Experiment Video

Updated: May 2, 2026

Geomagnetic Field Gmf and Plant Evolution: Investigating the Effects of Gmf Reversal on Arabidopsis thaliana Development and Gene Expression
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Nutrient dose-responsive transcriptome changes driven by Michaelis-Menten kinetics underlie plant growth rates.

Joseph Swift1, Jose M Alvarez1,2, Viviana Araus1

  • 1Center for Genomics and Systems Biology, Department of Biology, New York University, New York, NY 10003.

Proceedings of the National Academy of Sciences of the United States of America
|May 17, 2020
PubMed
Summary

Plant nutrient responses, like nitrogen dose, follow predictable kinetics. Researchers found that gene expression changes in Arabidopsis roots mirror this, revealing a molecular mechanism linking nutrient levels to growth.

Keywords:
Michaelis–Menten kineticsnitrogen dosetranscriptome regulation

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Area of Science:

  • Plant Biology
  • Molecular Biology
  • Genomics

Background:

  • Nutrient availability is crucial for crop yield, but the molecular mechanisms driving dose-response relationships are not well understood.
  • Understanding how plants sense and respond to nutrient levels at the molecular level is key to improving agricultural productivity.

Purpose of the Study:

  • To investigate the molecular basis of nutrient dose-response in plants.
  • To characterize the transcriptional changes in Arabidopsis roots exposed to varying nitrogen doses over time.

Main Methods:

  • Assayed changes in the Arabidopsis root transcriptome in response to different nitrogen (N) doses and time points.
  • Applied the Michaelis-Menten (MM) kinetic model to describe genome-wide transcript level changes.
  • Investigated the role of transcription factors (TFs), specifically TGA1, in regulating N-dose-responsive genes.

Main Results:

  • Transcriptional changes in response to N-dose followed the Michaelis-Menten (MM) model, allowing estimation of kinetic parameters (Vmax, Km) for 1,153 genes.
  • Altering TGA1 abundance affected the kinetics (Vmax, Km) of N-dose transcriptomic responses and plant growth.
  • Experimentally validated that MM-modeled genes are direct and indirect targets of TGA1.

Conclusions:

  • A molecular mechanism of transcriptional control explains how increased nutrient dose leads to proportional changes in gene expression and plant growth.
  • The Michaelis-Menten model provides a framework for understanding nutrient dose-response kinetics at the genome-wide expression level.
  • Transcription factors like TGA1 play a critical role in mediating plant responses to nutrient availability.