PRPS1 and hearing loss disorder: Moderate to mild PRPS1 deficiency is associated with hearing loss with later onset ataxia and optic neuropathy, also known as Charcot Marie Tooth Disease X linked 5 (CMTX5, OMIM #311070), or isolated hearing loss, also known as deafness X‐linked 1 (DFNX1, OMIM # 304500), respectively.