1️⃣ Luciferase Reporter Assay 🔍 Principle: Ligate the promoter sequence with luciferase reporter gene. The luminescence intensity directly reflects the regulatory activity of transcription factors, acting as a "molecular signal light" for genes. 💡 Applications: Verification of transcription factor interactions and miRNA target genes; it can also detect the activation status of signaling pathways including TGF‑β and Wnt.

2️⃣ Phosphorylation Detection via Western Blot (WB) 🔍 Principle: Phospho‑site specific antibodies directly recognize activated proteins in signaling cascades, accurately indicating whether the signaling pathway is activated. 💡 Applications: Validating activation of pathways such as STAT and MAPK. This method is the "gold standard" for signaling pathway research.

👉 Combined use of these two assays covers regulatory events from transcription to protein phosphorylation, forming a complete evidence chain for pathway studies! Choosing the right techniques for downstream functional validation will save you years of unnecessary trial and error.