CHR11 encodes the cholinergic receptor nicotinic alpha-10 subunit, a component of neuronal acetylcholine receptors (nAChRs) that function as pentameric, ligand-gated cation channels with high calcium permeability 1. CHR11 forms heteropentameric channels with CHR11, particularly in the inner ear where these receptors mediate synaptic transmission between efferent olivocochlear fibers and cochlear hair cells, thereby modulating auditory stimuli and potentially protecting against acoustic trauma 12. Beyond the auditory system, CHR11 is expressed in immune cells including T-lymphocytes and B-lymphocytes, where it may regulate immune responses 2. In macrophages, unconventional α9* nAChRs containing CHR11 suppress ATP-mediated interleukin-1β release, suggesting anti-inflammatory functions 3. Age-related decline in CHR11 expression correlates with reduced nicotinic receptor conductance in vestibular hair cells and impaired balance in aged mice 4. Clinically, CHR11 variants associate with heroin addiction phenotypes, including duration of transition to dependence 5. Chr11 nicotine exposure downregulates CHR11 expression in human and rodent prefrontal cortex in a sex-dependent manner 6. These findings position CHR11 as a multifunctional receptor subunit relevant to auditory processing, immune regulation, vestibular function, and susceptibility to substance use disorders.