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Related Experiment Video

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Genome-wide Analysis using ChIP to Identify Isoform-specific Gene Targets
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TF-ChIP Method for Tissue-Specific Gene Targets.

Amalia Perna1, Lavinia Auber Alberi1,2

  • 1Department of Medicine, University of Fribourg, Fribourg, Switzerland.

Frontiers in Cellular Neuroscience
|April 4, 2019
PubMed
Summary

This study presents a streamlined Chromatin Immunoprecipitation (ChIP) protocol for identifying transcription factor (TF) targets in whole tissues. This method enhances TF-ChIP for clinical applications and basic research, improving target identification in various tissues.

Keywords:
ChIPNotch signalingbraingene expressionlow amount DNAregion-specifictranscription factor

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Area of Science:

  • Molecular Biology
  • Genomics
  • Epigenetics

Background:

  • Chromatin Immunoprecipitation (ChIP) is crucial for studying DNA-protein interactions.
  • Existing ChIP protocols are less effective for identifying transcription factor (TF) targets in ex vivo tissues.
  • Nuclear signaling pathways are vital in chronic diseases like cancer and neurodegeneration, necessitating better TF target identification methods.

Purpose of the Study:

  • To develop and standardize a TF-ChIP protocol for detecting signaling targets in whole tissues or dissected regions.
  • To overcome limitations of current ChIP methods regarding low TF concentrations and complex protocols.
  • To enable TF-ChIP application in clinical settings using fresh or fresh-frozen tissue.

Main Methods:

  • A standardized protocol for TF-ChIP was developed, focusing on optimizing DNA fragmentation from whole tissue.
  • The protocol accommodates small amounts of starting material, suitable for tissue subregions and sparsely populated tissues like the brain.
  • The method utilizes specific antibodies for TF pull-down and is adaptable to various nuclear signaling pathways.

Main Results:

  • The protocol demonstrates high specificity for TF-targeting and yields high-quality DNA suitable for sequencing or hybridization.
  • It is effective for both fresh and fresh-frozen tissues, addressing specimen integrity challenges in clinical settings.
  • The method, centered on Notch signaling, can be applied to other nuclear signaling pathways with appropriate antibodies.

Conclusions:

  • This optimized TF-ChIP protocol provides a robust method for identifying dynamic gene changes in vivo.
  • It offers superior yield and readout compared to existing methods, making it valuable for basic research and clinical applications.
  • The protocol facilitates a deeper understanding of nuclear signaling in health and disease, aiding in therapeutic target identification.