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Background and Objectives  To expand the phenotype and genotype associated with  PCYT2 -related disorder.    Methods  Exome sequencing data from a patient with molecularly undiagnosed complex spastic paraplegia and axonal motor and sensory polyneuropathy were analyzed. Clinical data and nerve conduction studies of the patient and his affected brother were collected, and their phenotype and genotype were compared with previously reported patients with  PCYT2 -related disorder.    Results  A novel homozygous missense variant in  PCYT2  (NM_001184917.2) c.88T&gt;G; p.(Cys30Gly) was identified. This variant is located in a highly conserved tyrosine kinase site and is predicted damaging by several variant annotation tools. Both patients reported here and the previously published patients share several phenotypic features, including short stature, spastic tetraparesis, cerebellar ataxia, epilepsy, and cognitive decline. Axonal polyneuropathy, diagnosed in both brothers, was not previously reported.    Discussion  This family with a novel  PCYT2  variant expands the clinical spectrum of  PCYT2 -related disorder to include axonal motor and sensory polyneuropathy and the genetic spectrum to include the variant located in the first catalytic domain, whereas all previously reported variants are located in the second catalytic domain. Further research is required to disentangle the underlying pathophysiologic mechanisms, leading to the complex phenotype of  PCYT2 -related disorder.

Axonal Polyneuropathy in 2 Brothers With a Homozygous Missense Variant in the First Catalytic Domain of PCYT2