PATL1 (PAT1 homolog 1) is a conserved RNA-binding protein that serves as a critical regulator of mRNA metabolism and P-body assembly. PATL1 functions as a scaffold protein in the 5'-3' mRNA decay pathway, facilitating mRNA deadenylation, decapping, and degradation 1. The protein localizes to processing bodies (P-bodies), cytoplasmic ribonucleoprotein granules containing translationally repressed mRNAs, and is essential for P-body formation 12. PATL1 interacts with key mRNA decay factors including the CCR4-NOT deadenylase complex, decapping enzymes, and the RNA helicase DDX6 23. Beyond mRNA decay, PATL1 has diverse cellular functions including transcriptional regulation of hERG potassium channels through interaction with transcription factor TFIIE 4. In disease contexts, PATL1 is hijacked by hepatitis C virus (HCV) for viral replication, with HCV infection redistributing PATL1 from P-bodies to lipid droplets where viral replication occurs 56. The protein also interacts with ALG-2, a calcium-binding protein involved in various cellular processes 7. These functions establish PATL1 as a multifunctional regulator of gene expression operating at both transcriptional and post-transcriptional levels.