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Related Concept Videos

Transcription01:17

Transcription

32.5K
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,...
32.5K
Transcription01:10

Transcription

154.9K
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...
154.9K
Transcription Initiation01:47

Transcription Initiation

20.1K
Initiation is the first step of transcription in eukaryotes. Prokaryotic RNA Polymerase (RNAP) can bind to the template DNA and start transcribing. On the other hand, transcription in eukaryotes requires additional proteins, called transcription factors, to first bind to the promoter region in the DNA template. This binding helps recruit the specific RNAP that can assemble on the DNA and start transcription.
The promoters and enhancers and their accessory proteins allow tight regulation of...
20.1K
RNA Polymerase II Accessory Proteins02:36

RNA Polymerase II Accessory Proteins

10.7K
Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
10.7K
Transcription Factors02:16

Transcription Factors

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Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
82.2K
Transcription Elongation Factors02:35

Transcription Elongation Factors

13.3K
Transcription elongation is a dynamic process that alters depending upon the sequence heterogeneity of the DNA being transcribed. Hence, it is not surprising that the elongation complex's composition also varies along the way while transcribing a gene.
The transcription elongation is regulated via pausing of RNA polymerase on several occasions during transcription. In bacteria, these halts are necessary because the transcription of DNA into mRNA is coupled to the translation of that mRNA...
13.3K

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Lighting-up Transcription During Development.

Yang Yu1, Jinxing Ou1, Nathalie Dostatni1

  • 1Institut Curie, Université PSL, Sorbonne Université, CNRS, Nuclear Dynamics, Paris, France.

Journal of Molecular Biology
|November 3, 2025
PubMed
Summary
This summary is machine-generated.

Live imaging of RNA transcription in developing organisms reveals that gene expression timing is crucial for decoding positional information. This technique visualizes gene activity dynamics, offering insights into developmental gene regulation across species.

Keywords:
developing organismslive imaging of transcriptionpatterning

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Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Genetics

Background:

  • Live imaging of RNA transcription has become a pivotal tool in developmental biology.
  • Early studies in fruit fly embryos highlighted the significance of temporal dynamics in gene regulation.

Purpose of the Study:

  • To explore the role of temporal dynamics in decoding positional information during development.
  • To investigate the bursty dynamics of transcription in developmental genes.
  • To understand enhancer-promoter interactions and transcriptional memory.

Main Methods:

  • Fluorescent tagging of RNA for live imaging in vivo.
  • Single-locus analysis of transcription cycles in model organisms.
  • Adaptation of imaging techniques across diverse species.

Main Results:

  • Transcription of developmental genes exhibits bursty dynamics, with regulated burst frequency and duration.
  • Enhancer-promoter interactions occur through direct looping and shared transcriptional hubs.
  • RNA labeling visualizes transcriptional memory, dosage compensation, and chromosome dynamics.

Conclusions:

  • Temporal dynamics of transcription are critical for developmental processes.
  • Live imaging provides novel mechanistic insights into gene regulation.
  • These approaches facilitate cross-species comparisons of developmental mechanisms.