A novel mutation in the WNK1/HSN2 gene causing hereditary sensory and autonomic neuropathy type 2 in Chinese patient

Hereditary sensory and autonomic neuropathy type 2 (HSAN2) is a group of extremely rare autosomal recessive neurological disorders characterized by predominant sensory dysfunction and attendant severe complications, such as limb destruction. Our study reports a Chinese patient who met the diagnostic criteria for HSAN2 and harbored a homozygous mutation in the WNK1 gene (NM_213655.4: c.2689 G > T; p. Glu897*), Which led to nonsense-mediated mRNA decay of the transcript. Sanger sequencing revealed that the mutation segregates with disease status in the pedigree. These results expanded the spectrum of mutations in the WNK1 gene by identifying a novel mutation in a Chinese patient, providing a valuable reference for clinical diagnosis and treatment.