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Introduction to Nuclear Reprogramming01:14

Introduction to Nuclear Reprogramming

Nuclear reprogramming is the process of switching gene expression of one cell type to that of another cell type, usually from a differentiated cell state to an undifferentiated cell state. Differentiation occurs during processes such as development and morphogenesis, tissue regeneration, and malignancy. Cells can also be artificially induced to reprogram their gene expression by techniques such as nuclear transfer, induced pluripotency, and cell fusion. Such techniques have many applications in...
Master Transcription Regulators02:23

Master Transcription Regulators

Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
Master Transcription Regulators02:23

Master Transcription Regulators

Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
Transcription01:10

Transcription

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...
Transcription01:17

Transcription

Transcription is the synthesis of 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 correctly synthesizing messenger RNA (mRNA). Transcriptional regulation is responsible for the differentiation of different types of cells and often for the proper cellular response to environmental signals.
Transcription Can Produce Different Kinds of RNA Molecules
In eukaryotes,...
Transcription01:10

Transcription

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...

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Related Experiment Video

Updated: Jun 4, 2026

Generation of Composite Plants in Medicago truncatula used for Nodulation Assays
13:37

Generation of Composite Plants in Medicago truncatula used for Nodulation Assays

Published on: March 27, 2011

Transcription reprogramming during root nodule development in Medicago truncatula.

Sandra Moreau1, Marion Verdenaud, Thomas Ott

  • 1Laboratoire des Interactions Plantes Micro-organismes, Centre National de la Recherche Scientifique, Institut National de la Recherche Agronomique, Castanet-Tolosan, France.

Plos One
|February 10, 2011
PubMed
Summary

This study maps gene activation patterns during legume root nodule development, identifying key regulators and phases of symbiotic development. Most regulators are also involved in stress responses, with jasmonate pathway activation raising new questions.

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Last Updated: Jun 4, 2026

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13:37

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Published on: March 27, 2011

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Published on: May 14, 2020

Area of Science:

  • Plant Biology
  • Molecular Biology
  • Genetics

Background:

  • Understanding gene regulation in legume symbiosis is crucial for improving nitrogen fixation.
  • Precise activation stages and shared regulators of symbiotic genes remain largely unknown.

Purpose of the Study:

  • To define gene activation patterns and identify regulatory genes during Medicago truncatula root nodule development.
  • To investigate the overlap between nodule-specific regulators and those involved in other plant processes.

Main Methods:

  • Detailed microarray analysis of root nodules induced by Sinorhizobium meliloti.
  • Quantitative RT-PCR to analyze early gene expression stages in roots.

Main Results:

  • Eight major gene activation patterns and four transcriptional reprogramming phases were identified during nodule differentiation.
  • Differential expression of cytokinin biosynthesis genes in early nodule zones was observed.
  • Most identified regulators were not nodule-specific, with evidence for jasmonate pathway activation.

Conclusions:

  • Legume root nodule development involves distinct transcriptional phases, with regulators often shared with stress responses.
  • Cytokinin biosynthesis is actively controlled in early symbiotic zones.
  • The role of the jasmonate pathway in nodule development requires further investigation.