Deafness, Autosomal Recessive 68, also known as dfnb68, is related to deafness, autosomal recessive 35. An important gene associated with Deafness, Autosomal Recessive 68 is S1PR2 (Sphingosine-1-Phosphate Receptor 2). Affiliated tissues include brain, and related phenotype is sensorineural hearing impairment.