ChIP
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This protocol is in development.12:14, 21 August 2006 (EDT)
Overview
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Materials
11% Formaldehyde Solution
per 50 ml: (Final concentration)
- 14.9 ml of 37% Formaldehyde (11%)
- 1 ml of 5M NaCl (0.1M)
- 100 µl of 0.5 M EDTA, pH 8 (1 mM)
- 50 µl of 0.5 M EGTA, pH 8 (0.5 mM)
- 2.5 ml of 1M Hepes, pH 8 (50 mM)
2.5 M glycine (187.5 g/L)
- Dissolve glycine in water with constant stirring
- Don’t adjust pH
BSA/PBS Solution
per 100 mL:
- 10 mL of 10x PBS
- 500 mg of BSA
- 90 mL of H20
(good for at least a week)
Lysis Buffer 1 (LB1)
per 100 ml: (final concentration)
- 5 ml of 1M Hepes-KOH, pH 7.5 (50 mM)
- 2.8 ml of 5M NaCl (140 mM)
- 0.2 ml of 0.5M EDTA (1 mM)
- 10 ml of glycerol (10%)
- 5 ml of 10% NP-40 (0.5%)
- 0.25 ml of Triton X-100 (0.25%)
Lysis Buffer 2 (LB2)
per 100 ml: (final concentration)
- 4 ml of 5M NaCl (200 mM)
- 0.2 ml of 0.5M EDTA (1 mM)
- 0.1 ml of 0.5M EGTA (0.5 mM)
- 1.0 ml of 1M Tris pH 7.5 (10 mM)
Lysis Buffer 3 (LB3)
per 100 ml: (final concentration)
- 0.2 ml of 0.5M EDTA (1 mM)
- 0.1 ml of 0.5M EGTA (0.5 mM)
- 1.0 ml of 1M Tris-HCl, pH7.5 (10 mM)
- 2 mL of 5M NaCl (100 mM)
- 1 mL of 10% Na-Deoxycholate (0.1%)
- 500 mg of N-lauroyl sarcosine (0.5%)
Wash buffer (RIPA buffer)
per 100ml: (final concentration)
- 5ml of 1M Hepes, pH 7.6 (50 mM)
- 200µL of 0.5M EDTA (1 mM)
- 7 ml of 10% DOC (Na deoxycholate) (0.7%)
- 10 ml of 10% NP-40 (IPGEL) (1%)
- 10 ml of 5M LiCl or 2.12g powder (0.5 M)
Elution buffer
- 50mM Tris pH8
- 1mM EDTA
- 1% SDS
Procedure
I. Cell cross-linking
II. Preblock and binding of antibody to magnetic beads
III. Cell Sonication
IV. Chromatin Immunoprecipitation
- Add 100 µL Ab prebound Dynal magnetic beads from step III.
- Rock 4∞C 6 hrs to O/N.
V. Washing, eluting, and reverse cross-linking
VI. RNase, Proteinase K
Notes
- List troubleshooting tips here.
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References
Relevant papers and books
- Goldbeter A and Koshland DE Jr. An amplified sensitivity arising from covalent modification in biological systems. Proc Natl Acad Sci U S A. 1981 Nov;78(11):6840-4. DOI:10.1073/pnas.78.11.6840 |
- JACOB F and MONOD J. Genetic regulatory mechanisms in the synthesis of proteins. J Mol Biol. 1961 Jun;3:318-56. DOI:10.1016/s0022-2836(61)80072-7 |
- ISBN:0879697164
Contact
- Who has experience with this protocol?