<s>[INST] <<SYS>> This is a medical question of type : frequency <</SYS>> How many people are affected by autosomal recessive cerebellar ataxia type 1 ? [/INST] More than 100 people have been diagnosed with ARCA1. This condition was first discovered in individuals from the Beauce and Bas-Saint-Laurent regions of Quebec, Canada, but it has since been found in populations worldwide. </s>