GRXCR2 is a glutaredoxin and cysteine-rich domain protein essential for auditory function, localized to the base of stereocilia in cochlear hair cells 1. Its primary function is regulating stereocilia morphology through control of taperin localization; GRXCR2 forms a complex with taperin and restricts it to the stereocilia base, preventing its diffusion along the stereociliary length 1. In GRXCR2-deficient hair cells, taperin mislocalization leads to abnormally elongated and disorganized stereocilia that impair sound-induced mechanotransduction 1. GRXCR2 also interacts with CLIC5 at the stereociliary base; this interaction is crucial for normal hearing, particularly at higher frequencies 2. Mutations in GRXCR2 cause autosomal recessive nonsyndromic hearing loss (DFNB101), presenting as moderate-to-severe progressive deafness 3. Frameshift mutations produce unstable, mislocalized proteins resulting in loss-of-function 3. Significantly, reducing taperin expression levels can rescue stereocilia morphology and restore hearing in GRXCR2-deficient mice, suggesting potential therapeutic strategies 1 4. GRXCR2 mutations have been identified in multiple populations with hearing impairment, including Chinese Han and Cameroonian families 5 6.