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MicroRNAs (miRNAs) are small RNAs comprised of 20–25 nucleotides that regulates gene expression by inducing translational repression or degradation of target mRNA. The importance of miRNAs as a mediator of disease pathogenesis and therapeutic targets is rapidly emerging in neuroscience, as well as oncology, immunology, and cardiovascular diseases. In Parkinson’s disease and related disorders, multiple studies have identified the implications of specific miRNAs and the polymorphisms of miRNA target genes during the disease pathogenesis. With a focus on Parkinson’s disease, spinocerebellar ataxia, hereditary spastic paraplegia, and Huntington’s disease, this review summarizes and interprets the observations, and proposes future research topics in this field.
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Spinocerebellar ataxia type 8 patients typically have a slowly progressive, adult-onset ataxia. SCA8 is characterized by relatively pure cerebellar ataxia, which is caused by the expansion of combined CTA/CTG repeats on chromosome 13q21. We report a 58 years old woman with slowly progressive dysarthria, and gait ataxia. We performed genetic studies for SCA 1, 2, 3, 6, 7, 8, 17 and detected CTA/CTG repeat expansion in the SCA8 gene.