BACKGROUND: Mutations in optineurin have recently been linked to amyotrophic lateral sclerosis (ALS). OBJECTIVE: To determine whether optineurin-positive skeinlike inclusions are a common pathologic feature in ALS, including SOD1 -linked ALS. DESIGN: Clinical case series. SETTING: Academic referral center. SUBJECTS: We analyzed spinal cord sections from 46 clinically and pathologically diagnosed ALS cases and ALS transgenic mouse models overexpressing ALS-linked SOD1 mutations G93A or L126Z. RESULTS: We observed optineurin-immunoreactive skeinlike inclusions in all the sporadic ALS and familial ALS cases without SOD1 mutation, but not in cases with SOD1 mutations or in transgenic mice overexpressing the ALS-linked SOD1 mutations G93A or L126Z. CONCLUSION: The data from this study provide evidence that optineurin is involved in the pathogenesis of sporadic ALS and non- SOD1 familial ALS, thus supporting the hypothesis that these forms of ALS share a pathway that is distinct from that of SOD1-linked ALS.
BACKGROUND: Mutations in optineurin have recently been linked to amyotrophic lateral sclerosis (ALS). OBJECTIVE: To determine whether optineurin-positive skeinlike inclusions are a common pathologic feature in ALS, including SOD1 -linked ALS. DESIGN: Clinical case series. SETTING: Academic referral center. SUBJECTS: We analyzed spinal cord sections from 46 clinically and pathologically diagnosed ALS cases and ALStransgenicmouse models overexpressing ALS-linked SOD1 mutations G93A or L126Z. RESULTS: We observed optineurin-immunoreactive skeinlike inclusions in all the sporadic ALS and familial ALS cases without SOD1 mutation, but not in cases with SOD1 mutations or in transgenic mice overexpressing the ALS-linked SOD1 mutations G93A or L126Z. CONCLUSION: The data from this study provide evidence that optineurin is involved in the pathogenesis of sporadic ALS and non- SOD1familial ALS, thus supporting the hypothesis that these forms of ALS share a pathway that is distinct from that of SOD1-linked ALS.
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