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.
Gene silencing through the use of small interfering RNA (siRNA) has become a primary tool for identifying disease-causing genes. There are several aspects for preparing and delivering effective siRNA to knockdown a target gene. The length of siRNA should be 21–23nt long with G/C content 30–50%. If a validated siRNA sequence for your target gene is not available, use siRNA generated against the entire target gene ORF. Always work with two or three different siRNA constructs to get reliable results. If you are not sure how much siRNA to use for a given experiment, start with a transfection concentration of 10-50 nM and use siRNA-specific transfection reagent to ensure efficient siRNA delivery in a wide range of cells.
Get tips on using Human MMP-1 Antibody to perform Western blotting MMP1
Get tips on using Human ICAM-1/CD54 Antibody to perform Western blotting ICAM-1
Get tips on using Human HO 1 ELISA Kit (ab133064) to perform ELISA Human - HO-1
Get tips on using Human Dkk-1 ELISA Kit (RAB0143) to perform ELISA Human - Dkk-1
Get tips on using Human Dkk-1 DuoSet ELISA (DY1906) to perform ELISA Human - Dkk-1
Get tips on using FxCycle™ PI/RNase Staining Solution to perform Cell cycle assay human - THP-1
Get tips on using MethylFlash Methylated DNA 5-mC Quantification Kit to perform DNA quantification Human - THP 1
Get tips on using Human Syndecan-1 ELISA Kit (CD138) (ab46506) to perform ELISA Human - SDC1
Fill out your contact details and receive price quotes in your Inbox
Outsource experiment