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Ancestor membership does not transfer phenotype values between groups.","importantHtml":""},"sections":[{"bodyHtml":"<p>Mutations in the SYNE1 gene cause ARCA1. The SYNE1 gene provides instructions for making a protein called Syne-1 that is found in many tissues, but it seems to be especially critical in the brain. Within the brain, the Syne-1 protein appears to play a role in the maintenance of the cerebellum, which is the part of the brain that coordinates movement. The Syne-1 protein is active (expressed) in Purkinje cells, which are located in the cerebellum and are involved in chemical signaling between nerve cells (neurons).</p><p>SYNE1 gene mutations that cause ARCA1 result in an abnormally short, dysfunctional version of the Syne-1 protein. The defective protein is thought to impair Purkinje cell function and disrupt signaling between neurons in the cerebellum. The loss of brain cells in the cerebellum causes the movement problems characteristic of ARCA1, but it is unclear how this cell loss is related to impaired Purkinje cell function.</p><p class=\"section-source\"><a href=\"https://medlineplus.gov/genetics/condition/autosomal-recessive-cerebellar-ataxia-type-1/#causes\">MedlinePlus Genetics: Causes</a></p>","key":"forms","title":"What causes Autosomal recessive cerebellar ataxia type 1?"},{"bodyHtml":"<p class=\"section-source\">Source: <a href=\"https://medlineplus.gov/genetics/condition/autosomal-recessive-cerebellar-ataxia-type-1\">MedlinePlus Genetics</a></p>","key":"overview","title":"Condition overview"}],"sharedSources":[],"slug":"autosomal-recessive-cerebellar-ataxia-type-1","sourceDocuments":[{"name":"Autosomal recessive cerebellar ataxia type 1","reviewed":"2010-10","sections":{"causes":{"fetchedAt":"2026-10-20T20:19:41.446176+00:00","label":"Causes","pageSha256":"5f0a9c2500a2bf905e5d9fb56c35148132861bef805f3ef9aa1ffac3b32a81eb","sourceUrl":"https://medlineplus.gov/genetics/condition/autosomal-recessive-cerebellar-ataxia-type-1/#causes","status":"available"}},"source_release":"2026-10-01","url":"https://medlineplus.gov/genetics/condition/autosomal-recessive-cerebellar-ataxia-type-1"}],"sourceNote":"MedlinePlus descriptions and Causes; original HPO annotations.","takeawayHtml":"Cause explanations are from MedlinePlus Genetics. Feature values below retain their original sources and patient groups.","title":"Autosomal recessive cerebellar ataxia type 1"},"schemaVersion":1}