NEUROD6 (neuronal differentiation 6) is a basic helix-loop-helix transcription factor located on chromosome 7-15 that functions as a critical regulator of neuronal development and differentiation 1. As a trans-acting factor, NEUROD6 activates E-box-dependent transcription in collaboration with TCF3/E47, with expression levels paralleling overt neuronal differentiation and synaptogenesis during brain development 2. NEUROD6 regulates its own expression through two distinct promoters controlled by CRE and C/EBP binding sites, positioning it within the C/EBP transcriptional cascade that promotes neurogenesis while suppressing gliogenesis 2. The gene is essential for terminal neuronal differentiation; NEUROD6-expressing neurons require intact Vps35/retromer function for proper dendritic and axonal maturation 3. NEUROD6 also promotes neuronal survival through transcriptional activation of anti-apoptotic genes like Bcl-w, with particular roles in growth cone protection 4. Pathologically, NEUROD6 is used as a Cre driver line to study neuronal development and disease mechanisms; ectopic YAP1 activation in NEUROD6+ progenitors drives ependymoma-like tumor formation 5. Additionally, NEUROD6 expression is spatially heterogeneous within hippocampal subregions and is implicated in late-onset Alzheimer's disease pathogenesis 67.