HHEX is a transcription factor that functions as a key regulator of foregut lineage specification and metabolic homeostasis. Mechanistically, HHEX acts as a transcriptional repressor and activator that recognizes specific DNA sequences and cooperates with pioneer factors FOXA1, FOXA2, and GATA4 to orchestrate lineage commitment 1. During early primate gastrulation, HHEX marks the anterior visceral endoderm and participates in WNT signaling coordination 2. HHEX functions as a gatekeeper of pancreatic lineage specification; its deletion impairs pancreatic commitment while unleashing plasticity toward liver and duodenum fates 1. Clinically, HHEX variants are associated with multiple metabolic disorders. Polymorphisms rs1111875 and rs5015480 in HHEX increase susceptibility to gestational diabetes mellitus (GDM) and type 2 diabetes mellitus, with the C allele conferring elevated risk [PMID:37103601; 3; 45]. Heterozygous HHEX mutations cause thyroid dysgenesis-associated congenital hypothyroidism 5. Recent proteome-wide analysis identified HHEX as a protein mediator linking fasting insulin to coronary artery disease risk 6. In cancer, HHEX is overexpressed in hepatocellular carcinoma, where it promotes cancer stem cell properties and tumorigenesis through the ABI2/SLC17A9 axis 7. These findings establish HHEX as a critical regulator of both developmental lineage specification and metabolic/pathological disease processes.