AA
Ana Arnaiz
  • Universidad Politécnica de Madrid Madrid
HaloChIP-seq for Antibody-Independent Mapping of Mouse Transcription Factor Cistromes in vivo

Chromatin immunoprecipitation (ChIP) maps, on a genome-wide scale, transcription factor binding sites, and the distribution of other chromatin-associated proteins and their modifications. As such, it provides valuable insights into mechanisms of gene regulation. However, successful ChIP experiments are dependent on the availability of a high-quality antibody against the target of interest. Using antibodies with poor sensitivity and specificity can yield misleading results. This can be partly circumvented by using epitope-tagged systems (e.g., HA, Myc, His), but these approaches are still antibody-dependent. HaloTag® is a modified dehalogenase enzyme, which covalently binds synthetic ligands. This system can be used for imaging and purification of HaloTag® fusion proteins, and has been used for ChIP in vitro. Here, we present a protocol for using the HaloTag® system for ChIP in vivo, to map, with sensitivity and specificity, the cistrome of a dynamic mouse transcription factor expressed at its endogenous locus.


Graphical abstract:



Circadian Gene Profiling in Laser Capture Microdissected Mouse Club Cells
Authors:  Zhenguang Zhang and Andrew Loudon, date: 04/20/2020, view: 3478, Q&A: 0
Cell heterogeneity is high in tissues like lung. Research conducted on pure population of cells usually offers more insights than bulk tissues, such as circadian clock work. In this protocol, we provide a detailed work flow on how to do circadian clock study by RNA seq in laser capture micro-dissected mouse lung club cells. The method uses frozen tissues and is highly reproduciable.
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