ABSTRACT
<p><b>OBJECTIVE</b>To study the normal range of (CTA/CTG)n repeats of ATXN8OS gene in Chinese Hans, and the frequency of ATXN8OS (CTA/CTG)n repeat expansion in spinocerebellar ataxia(SCA) patients in Mainland China.</p><p><b>METHODS</b>The (CTA/CTG)n repeats of ATXN8OS gene were detected using fluorescence-PCR, 8% denaturing polyacrylamide gel and capillary electrophoresis technique in 132 SCA patients in whom CAG expansion at the SCA1, SCA2, SCA3, SCA6, SCA7, SCA12, SCA17 and dentatorubral-pallidoluysian atrophy(DRPLA) loci has been excluded, and 261 healthy controls.</p><p><b>RESULTS</b>There were no obvious abnormal changes of the (CTA/CTG)n repeats of ATXN8OS gene in the 132 SCA patients. Thirty-five SCA patients were homozygotes (26.5%), and the range of CTA/CTG repeat number was 17 to 47 (24.20+/-4.57), among which 18 repeats appeared most frequently. In 261 normal controls, 70 were homozygotes (26.8%), and the range of the CTA/CTG repeat number was from 12 to 43 (24.04+/-4.53), among which 18 repeats was the most frequent.</p><p><b>CONCLUSION</b>SCA8 is a rare subtype of SCA in Mainland China. The low prevalence of SCA8 seems to be correlated with the low frequency of large (CTA/CTG)n copy number alleles in Chinese population.</p>
Subject(s)
Adolescent , Adult , Aged , Child , Child, Preschool , Female , Humans , Male , Middle Aged , Alleles , Asian People , Genetics , Base Sequence , Case-Control Studies , DNA Mutational Analysis , Ethnicity , Genetics , Gene Dosage , Gene Frequency , Nerve Tissue Proteins , Genetics , RNA, Long Noncoding , RNA, Untranslated , Spinocerebellar Ataxias , Genetics , Trinucleotide Repeats , GeneticsABSTRACT
<p><b>OBJECTIVE</b>To study the single-nucleotide substitution (c.-16C to T) of the PURATROPHIN-1 gene in spinocerebellar ataxia (SCA) patients in China.</p><p><b>METHODS</b>The single-nucleotide substitution (c.-16C to T) of the PURATROPHIN-1 gene was detected by PCR, digested with EcoN I, separated on 8% polyacrylamide gel in 68 probands of autosomal dominant SCA families and 119 sporadic SCA patients, who had been excluded CAG/CAA repeat expansion at the SCA1, 2, 3, 6, 7, 17 and dentatorubral-pallidolluysian atrophy (DRPLA) loci. The results were confirmed in four patients by direct sequencing.</p><p><b>RESULTS</b>The single-nucleotide substitution (c.-16C to T) of the PURATROPHIN-1 gene was not identified in authors' cohort.</p><p><b>CONCLUSION</b>The mutation of c.-16C to T of the PURATROPHIN-1 gene might be rare in SCA patients in China.</p>