title: [Frequency of different subtypes of spinocerebellar ataxia in the Han nationality of Hunan province in China].
abstract: OBJECTIVE
  To determine the frequency of different subtypes of spinocerebellar ataxias (SCAs) in the Han nationality of Hunan province in China.
  
  
  METHODS
  The mutations of SCA1, SCA2, SCA3, SCA6, SCA7, SCA17, and dentatorulral-pallidoluysian (DRPLA) were detected with the polymerase chain reaction (PCR), denaturing polyacrylamide gel and DNA sequencing techniques in 139 autosomal dominant SCA families and 61 sporadic SCA patients.
  
  
  RESULTS
  Of the 139 families, 11 (7.9%) were positive for SCA1, 9(6.5%) were positive for SCA2, 71 (51.1%) were positive for SCA3, 4 (2.9%) were positive for SCA6, 2 (1.4%) were positive for SCA7, and none was positive for SCA17 and DRPLA. There was 1 SCA2 patient, 3 SCA3 patients, 1 SCA6 patient in the 61 sporadic SCA patients.
  
  
  CONCLUSIONS
  The frequency of SCA3 is substantially higher than that of SCA1 and SCA2 in the autosomal dominant SCA patients in the Han nationality of Hunan province. SCA6 and SCA7 are rare subtypes.
authors.affiliation: Department of Neurology, Xiangya Hospital, Central South University, Changsha 410008, China.
authors.forename: Xing-wang
authors.initials: XW
authors.lastname: Song
authors.forename: Bei-sha
authors.initials: BS
authors.lastname: Tang
authors.forename: Hong
authors.initials: H
authors.lastname: Jiang
authors.forename: Lu
authors.initials: L
authors.lastname: Shen
authors.forename: Qian
authors.initials: Q
authors.lastname: Yang
authors.forename: Shu-sheng
authors.initials: SS
authors.lastname: Liao
authors.forename: Qing-hua
authors.initials: QH
authors.lastname: Li
authors.forename: Jian-guang
authors.initials: JG
authors.lastname: Tang
mesh_terms: D000293:Adolescent; D000328:Adult; D000067696:Ataxin-1; D000067699:Ataxin-3; D000067719:Ataxin-7; D000067528:Ataxins; D002648:Child; D002681:China / Q000208:ethnology; D004252:DNA Mutational Analysis; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009419:Nerve Tissue Proteins / Q000235:genetics; D009687:Nuclear Proteins / Q000235:genetics; D012097:Repressor Proteins / Q000235:genetics; D020754:Spinocerebellar Ataxias / Q000145:classification / Q000175:diagnosis / Q000235:genetics*; D018911:Trinucleotide Repeats / Q000235:genetics*
chemical_list: C000593749:ATXN1 protein, human; C000593829:ATXN7 protein, human; D000067696:Ataxin-1; D000067719:Ataxin-7; D000067528:Ataxins; D009419:Nerve Tissue Proteins; D009687:Nuclear Proteins; D012097:Repressor Proteins; C092341:ATXN3 protein, human; D000067699:Ataxin-3