LHX5 (LIM homeobox 5) is a transcription factor that plays essential roles in central nervous system development, particularly in neuronal differentiation and migration 1. The protein contains LIM and homeobox domains and functions as a DNA-binding transcription factor that regulates RNA polymerase II-mediated transcription. LHX5 is critical for hippocampal morphogenesis, where it controls precursor cell proliferation and ensures proper neuronal differentiation and migration; mice lacking Lhx5 show severely disorganized brain morphology and cognitive/motor coordination defects 2. The gene also functions in cerebellar development, working alongside Lhx1 to control Purkinje cell differentiation, with double mutants showing severe reduction in Purkinje cell numbers 3. LHX5 exhibits dynamic expression patterns during forebrain development, initially expressed broadly in the diencephalic primordium before becoming restricted to specific regions in an alternating pattern with Dlx genes 4. Recent genome-wide association studies have identified LHX5-AS1 (antisense RNA near LHX5) as a novel risk locus for late-onset Alzheimer's disease, suggesting potential involvement in neurodegeneration 5. The gene is also implicated as a prognostic marker in breast cancer through chr12 remodeling pathways 6.