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Related Concept Videos

Chromatin Immunoprecipitation- ChIP02:36

Chromatin Immunoprecipitation- ChIP

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Chromatin immunoprecipitation, or ChIP, is an antibody-based technique used to identify sites on DNA that bind to transcription factors of interest or histone proteins. It also helps determine the type of histone modifications such as acetylation, phosphorylation, or methylation.
Types of ChIP
ChIP can be divided into two types - X-ChIP and N-ChIP. X-ChIP involves in vivo cross-linking of histones and regulatory proteins to DNA, fragmenting the DNA by sonication, and isolating the protein-DNA...
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Related Experiment Video

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Sequential Salt Extractions for the Analysis of Bulk Chromatin Binding Properties of Chromatin Modifying Complexes
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Analysis of chromatin binding dynamics using the crosslinking kinetics (CLK) method.

Ramya Viswanathan1, Elizabeth A Hoffman1, Savera J Shetty1

  • 1Department of Biochemistry and Molecular Genetics, University of Virginia Health System, Charlottesville, VA 22908, United States.

Methods (San Diego, Calif.)
|December 3, 2014
PubMed
Summary

This study introduces the crosslinking kinetics (CLK) assay to measure transcription factor binding dynamics. The CLK assay quantifies in vivo chromatin binding on- and off-rates, advancing understanding of gene regulation.

Keywords:
Chromatin immunoprecipitationDynamicsFormaldehydeKineticMethod

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Area of Science:

  • Molecular biology
  • Genetics
  • Biochemistry

Background:

  • Transcription factor binding sites are crucial for cell state determination.
  • Current methods like chromatin immunoprecipitation provide location but not dynamic binding information.
  • Understanding in vivo binding dynamics is essential for fundamental molecular questions.

Purpose of the Study:

  • To develop a novel assay for measuring transcription factor binding dynamics in vivo.
  • To extract on- and off-rates of chromatin binding.
  • To complement existing methods for analyzing transcription factor-DNA interactions.

Main Methods:

  • Development of the crosslinking kinetics (CLK) assay.
  • Utilizing the time-dependence of formaldehyde crosslinking.
  • Quantifying in vivo chromatin binding kinetics.

Main Results:

  • The CLK assay successfully extracts on- and off-rates for chromatin binding.
  • Demonstrates the feasibility of measuring dynamic transcription factor binding.
  • Provides a new tool for studying gene regulation.

Conclusions:

  • The CLK assay offers a powerful method to investigate transcription factor binding dynamics.
  • This technique enhances the understanding of gene regulation at the molecular level.
  • Advances the study of chromatin-associated proteins and their functions.