BARHL2 (BarH like homeobox 2) is a homeodomain-containing transcription factor that plays crucial roles in neural development and cell fate specification. In the developing brain, BARHL2 functions downstream of orthodentricle-2 (otx2) and cooperates with iroquois-3 (irx3) to establish the Zona limitans intrathalamica (ZLI), a signaling center that secretes Sonic Hedgehog to control caudal forebrain growth and regionalization 1. The gene is essential for ZLI and thalamus fate determination within the p2 alar plate 1. In retinal development, BARHL2 acts as both a positive and negative regulator, specifically promoting glycinergic amacrine cell differentiation while inhibiting bipolar and Müller glial cell formation 2. The protein exhibits sequence-specific DNA binding activity and regulates transcription by RNA polymerase II. BARHL2 also contributes to neural progenitor survival and proliferation control through interactions with apoptotic machinery, particularly caspase-3 3. In disease contexts, BARHL2 shows clinical relevance as a hypermethylated gene in astrocytomas 4 and appears in novel fusion events in lung cancer patients, with potential therapeutic implications 5.