ChIP Mouse - NIH3T3

DNA-protein interactions are studied by using ChIP. The basic steps in this technique are crosslinking, sonication, immunoprecipitation, and analysis of the immunoprecipitated DNA. During ChIP, if chromatin is under-fragmented or fragments are too large which can lead to the increased background and lower resolution. Shorter cross-linking times (5-10 min) and/or lower formaldehyde concentrations (<1%) may improve shearing efficiency. If Chromatin is over-fragmented, then optimize shearing conditions for each cell type to improve ChIP efficiency. Over-sonication of chromatin may disrupt chromatin integrity and denature antibody epitopes. If you do not see any product or very little product in the input PCR reactions, add 5–10 μg chromatin per IP.

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Found 3 matching solutions for this experiment

Upstream tips
-Warm IP Lysis Buffer to room temperature to prevent precipitation.
-Prepare one extra plate of cells to estimate cell number.
-Thaw Protease Inhibitor Cocktail (PIC) at room temperature.
-It is recommended to take some trial to optimize sonication condition before beginning with sonication.
Protocol tips
-In general it is recommended that one million mammalian cells are required for each IP
fraction.
-Centrifuge the sample at 6000 × g for 5 min at 4 °C to eliminate bubbles.
-To reduce background, remove as much supernatant as possible in the last wash. Continue with next step OR store at 4°C overnight.
Upstream tips
-The 1.25 M glycine must be at room temperature before use.
-The Lysis Buffer must be at room temperature and fully resuspended before use. Vortex briefly to resuspend.
Protocol tips
-For each ChIP reaction, use 10,000–300,000 cells or 0.167–5 mg of tissue.
-1–10 μg of antibody is a typical starting range.
- 10-minute crosslinking step using formaldehyde at a 1% final concentration.
-Keep the cell lysate cooled on ice during sonication.
Upstream tips
-Do not re-freeze the Protein G magnetic beads, the beads should be stored at 4C.
Protocol tips
-Always use ChIP validated antibody.
-Optimal use of 1-3 ug of antibody.
Downstream tips
-The diluted Proteinase K stop solution can not be stored.
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