NRL (neural retina leucine zipper) is a Maf-family basic leucine zipper transcription factor that serves as a master regulator of rod photoreceptor specification and function 1. NRL acts as a transcriptional activator and coactivator, controlling the expression of rod-specific genes including rhodopsin (RHO) and phosphodiesterase 6B (PDE6B) 2. The protein functions synergistically with transcription factor CRX, forming protein complexes in the nucleus that enhance rod phototransduction gene expression 3. NRL binds sequence-specifically to the rhodopsin promoter and regulates transcription through interactions with RNA polymerase II 4. Beyond its transcriptional role, NRL interacts with multiple RNA-binding proteins and R-loops at genomic regulatory elements, suggesting additional functions in coordinating transcription with RNA processing during photoreceptor maturation 5. In the absence of functional NRL, photoreceptor precursor cells adopt a default developmental pathway, differentiating into S-cone-like cells rather than rods, demonstrating NRL's critical role in rod identity specification 1. Mutations in NRL are associated with retinitis pigmentosa 27 and autosomal recessive retinal degeneration, highlighting its clinical significance in inherited retinal diseases 4.