to BioTechniques free email alert service to receive content updates.

Magnetic beads enable a streamlined ChIP method
Sponsored,vendor-submitted protocol   Published in December 2006 2007 (p.23) Abstract

Chromatin Immunoprecipitation (ChIP) is a standard technique for analysis of transcriptional regulation and chromatin structure.

Chromatin Immunoprecipitation (ChIP) is a standard technique for analysis of transcriptional regulation and chromatin structure. All standard ChIP methods utilize agarose-based affinity beads to capture the antibody/chromatin complexes. However, spin-washing these beads is slow and tedious. In addition, DNA isolated through these methods must be further purified (by spin columns or phenol/chloroform extraction & precipitation) prior to PCR analysis.

We have developed a greatly simplified ChIP protocol that utilizes magnetic protein G-coated beads for antibody capture. This dramatically reduces washing time and enables the use of multi-channel pipetting, so that many samples can be assayed simultaneously (Figure 1).

Reduced background eliminates steps

The new ChIP-IT™ Express method improves on traditional ChIP by reducing or eliminating several time-consuming steps. The magnetic beads have much lower background than traditional agarose beads, so pre-clearing and blocking of the chromatin are no longer necessary. Wash steps are faster and fewer because centrifugation is replaced by magnetic pull-down, significantly reducing the amount of hands-on time. In addition, improvement of the chromatin elution and proteinase K treatment steps has completely eliminated the need for a separate DNA purification step after ChIP is complete (Figure 2). This not only saves time, it minimizes manipulations and eliminates DNA loss that occurs during purification, both of which help ensure sample-to-sample consistency.

Complete kit ensures successful ChIP

ChIP-IT Express Kits transform ChIP from a labor-intensive protocol that is appropriate for only a small number of samples into a rapid method that is suitable for experiments requiring multiple samples (e.g. studies of pathway induction, time-course experiments, etc.). The kits incorporate all of these improvements and include the reagents required to perform your choice of either enzymatic- or sonication-type chromatin shearing, and perform 25 ChIP reactions, including a powerful bar magnetic. For complete details, visit Web site (external).

More Information
Do you have question about this protocol? Would you like more information about this protocol?
Submit your questions here and Biotechniques will forward your question and contact information from our database to an expert at
Yes, please forward my question, along with my name, title, company, and e-mail address to
BioTechniques will forward your question to the company, who will contact you directly by email.
Request more information
Name Question
Job Title
rightcontent.jsp called otherwise condition rightcontent.jsp called 222222222222222222222
Search Protocols
Search our protocols for your specific technique.
Submit Your Protocols
BioTechniques is always looking for author-submitted protocols related to peer-reviewed papers, so submit your protocols today to our editorial team. Suppliers or advertisers interested in publishing their protocols should also submit.
Click here for more information