No Signal at Region of Interest Due to Absent Target (ChIP (Low Signal))

Question

Accepted Answer

No signal detected at the specific region of interest while ChIP procedure appears technically successful. Other genomic regions or positive controls may show expected signals. Common causes: 1) Target epitope is not present at the queried genomic region 2) Biological conditions do not induce target protein binding at this locus 3) Incorrect primer design amplifying wrong genomic region 4) Cell type or treatment does not express the target protein at this site Solutions: 1) Include positive control antibody (e.g. H3K4me3 at active promoters, H3K9me3 at inactive promoters) 2) Use well-characterized genomic regions known to bind your target protein 3) Verify primer specificity by sequencing PCR products 4) Consult literature or databases (e.g. ENCODE) for validated target binding sites