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Related Concept Videos

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...
Regulation of Expression Occurs at Multiple Steps02:24

Regulation of Expression Occurs at Multiple Steps

Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
Regulation of Expression Occurs at Multiple Steps02:24

Regulation of Expression Occurs at Multiple Steps

Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
RNA Polymerase II Accessory Proteins02:36

RNA Polymerase II Accessory Proteins

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...
Regulation of Expression at Multiple Steps01:23

Regulation of Expression at Multiple Steps

The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the addition of a...
Determination01:51

Determination

During embryogenesis, cells become progressively committed to different fates through a two-step process: specification followed by determination. Specification is demonstrated by removing a segment of an early embryo, “neutrally” culturing the tissue in vitro—for example, in a petri dish with simple medium—and then observing the derivatives. If the cultured region gives rise to cell types that it would normally generate in the embryo, this means that it is specified. In contrast, determination...

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Related Experiment Video

Updated: Jul 9, 2026

Temporal Ordering of Dynamic Expression Data from Detailed Spatial Expression Maps
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Temporal Ordering of Dynamic Expression Data from Detailed Spatial Expression Maps

Published on: February 9, 2017

Spatial specificity of mesodermal even-skipped expression relies on multiple repressor sites.

Jiandong Liu1, Li Qian, Zhe Han

  • 1Development and Aging Program, Center for Neuroscienes, Aging and Stem Cell Research, Burnham Institute for Medical Research, 10901 North Torrey Pines Road, La Jolla, CA 92037, USA.

Developmental Biology
|December 11, 2007
PubMed
Summary

Precise cardiac progenitor positioning relies on gene regulation. This study identifies new repressor motifs and factors controlling even-skipped (eve) gene expression, ensuring correct spatial patterns for heart development.

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Last Updated: Jul 9, 2026

Temporal Ordering of Dynamic Expression Data from Detailed Spatial Expression Maps
11:52

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Published on: February 9, 2017

Blastomere Explants to Test for Cell Fate Commitment During Embryonic Development
14:08

Blastomere Explants to Test for Cell Fate Commitment During Embryonic Development

Published on: January 26, 2013

Area of Science:

  • Developmental Biology
  • Molecular Genetics
  • Cardiovascular Research

Background:

  • Cardiac progenitor specification relies on segmental information and gene interactions.
  • The even-skipped (eve) gene and its enhancer (eme) are crucial for cardiac mesoderm patterning.
  • Repressive interactions between transcription factors refine gene expression domains.

Purpose of the Study:

  • To identify additional regulatory elements controlling eve expression in the cardiac mesoderm.
  • To investigate the role of novel repressor motifs in spatial gene regulation.
  • To understand the mechanisms ensuring precise cardiac progenitor patterning.

Main Methods:

  • Mutation analysis of the eve mesodermal enhancer (eme).
  • Reporter gene assays to assess enhancer activity.
  • Overexpression studies of potential negative regulators of eve.

Main Results:

  • Identified four "AT"-rich (M1a-d) and two "GC"-rich (M2 a,b) repressor motifs in the eme.
  • Mutating these motifs led to expanded reporter gene expression, indicating their repressive function.
  • Overexpression of negative regulators repressed eve and eme activity via these sites.

Conclusions:

  • Multiple repressor sites and interacting factors are essential for precise spatial control of eve expression.
  • These regulatory mechanisms ensure correct positioning of cardiac progenitors.
  • Findings contribute to understanding the molecular basis of heart development.