No DNA Amplification in ChIP Samples (ChIP (PCR Amplification Problems))

Question

Accepted Answer

No PCR product is detected in ChIP samples by qPCR or gel electrophoresis. Ct values fail to appear or remain above threshold, and no visible bands are observed on gels. Common causes: 1) Primers are non-functional or degraded 2) Insufficient ChIP DNA input due to poor immunoprecipitation efficiency 3) DNA degradation during ChIP or storage 4) PCR inhibitors carried over from ChIP buffers or beads 5) Incorrect primer design targeting wrong genomic region Solutions: 1) Include standard/input DNA control to confirm primers are working properly 2) Test primers on known positive control DNA (e.g. 10% input chromatin) 3) Verify DNA concentration using Qubit or spectrophotometry; ensure sufficient template 4) Dilute ChIP eluate (e.g. 1:5 or 1:10) to reduce potential PCR inhibitors 5) Check primer sequences and validate genomic coordinates match target site 6) Use fresh primer aliquots; avoid repeated freeze-thaw cycles