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Spinocerebellar ataxia (SCA) is a group of genetic diseases of the nervous system with genetic and clinical heterogeneity. SCA is often caused by an expanded CAG repeat sequence in the encoding protein. Genetic testing is necessary to diagnose and classify the types of SCA. Next‑generation DNA sequencing usually generates a high error rate for insertion or deletion mutations, so it is unhelpful for classifying the types of SCA. In the present study, a Chinese SCA pedigree was preliminarily diagnosed with SCA1 using polymerase chain reaction (PCR) amplification. The propositus and his three younger siblings were diagnosed with SCA1 as a result of the identification of the length of the expanded CAG repeat sequence in the ATXN1 gene performed using Sanger sequencing. The current study presents a convenient and efficient method to identify causative mutations for polyglutamine SCA using PCR amplification followed by Sanger sequencing.

Diagnosis of polyglutamine spinocerebellar ataxias by polymerase chain reaction amplification and Sanger sequencing