Target protein absent or below detection threshold in tissue (Immunohistochemistry (No Staining))

Question

Accepted Answer

No staining observed in experimental tissue samples. The target protein may not be expressed in the tissue type or developmental stage being examined, or present at undetectable levels. Common causes: 1) Target protein not expressed in the specific tissue type examined 2) Protein expression below detection limit of the IHC method 3) Developmental stage or physiological condition not supporting protein expression 4) Tissue heterogeneity with target protein present only in specific cell populations Solutions: 1) Review scientific literature to confirm protein expression in your tissue type 2) Use known positive control tissue verified to express target protein 3) Validate protein presence by western blot or RT-PCR before IHC 4) For low-abundance proteins, implement signal amplification (biotin-streptavidin, TSA) 5) Consider tissue from different developmental stages or treatment conditions 6) Examine multiple tissue sections to account for spatial heterogeneity