title: Posterior column ataxia-retinitis pigmentosa syndrome
text: # Posterior column ataxia-retinitis pigmentosa syndrome
  
  Posterior column ataxia-retinitis pigmentosa syndrome (PCARP) is an autosomal recessive genetic disorder of the human eye, attributed to mutation of a gene] originally dubbed AXPC1 which was identified as a mutation in the FLCVR1 gene. Generally rare, a Pennsylvania Mennonite variant has been estimated to have a population allele prevalence close to 1% due to founder effects.
  
  ## Clinical phenotype
  
  The syndrome was described having childhood-onset symptoms with sensory neuropathy characterized by proprioceptive loss with retinitis pigmentosa presenting with concentric visual field loss. By adulthood patients were blind with ataxia.
  
  