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Brain magnetic resonance imaging demonstrated cerebellar atrophy, and electromyography showed neurogenic damage. Muscle biopsy revealed fiber\u2010type grouping, indicative of neurogenic changes, with no evidence of primary myopathy. LRS detected pathogenic\u2010length CGG repeat expansions (&gt;100 repeats) in\n                      <jats:italic>GIPC1<\/jats:italic>\n                      , which were validated by repeat\u2010primed polymerase chain reaction.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>\n                      These findings expand the phenotypic spectrum associated with\n                      <jats:italic>GIPC1<\/jats:italic>\n                      CGG repeat expansion and define a novel subtype of childhood\u2010onset hereditary ataxia accompanied by mild cognitive impairment and neurogenic involvement. \u00a9 2026 International Parkinson and Movement Disorder Society.\n                    <\/jats:p>\n                  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