FOXD3 is a forkhead box transcription factor that binds DNA sequences matching the consensus 5'-A[AT]T[AG]TTTGTTT-3' and functions as both a transcriptional repressor and activator. It negatively regulates the transcriptional repressor RHIT/ZNF205 and promotes neural crest cell development from neural tube progenitors while suppressing interneuron differentiation. FOXD3 is essential for maintaining pluripotent cells during early embryogenesis; dose-dependent expression balances human embryonic stem cells between pluripotency and meso-endoderm differentiation 1. Recent evidence indicates FOXD3 promotes homologous recombination repair and genomic stability by facilitating MRE11-mediated DNA end resection 2. In cancer, FOXD3 exerts tumor-suppressive effects through microRNA-dependent pathways. In colorectal cancer, the FOXD3/miR-214/MED19 axis inhibits proliferation, invasion, and metastasis 3. Similarly, in hepatocellular carcinoma, FOXD3 activates miR-137 transcription, which suppresses tumor growth and metastasis by targeting AKT2 4. Beyond cancer, FOXD3 influences neurotoxic astrocyte reactivity in Parkinson's disease; the CSE-YAP complex facilitates FOXD3-mediated astrocyte phenotype transitions that influence neuroinflammation 5. These findings position FOXD3 as a multifunctional regulator relevant to developmental biology, DNA repair, and disease pathogenesis.