Familial late-onset focal dystonia in an African American family

Puschmann, Andreas J.Lund University,Lunds universitet,Neurologi, Lund,Sektion IV,Institutionen för kliniska vetenskaper, Lund,Medicinska fakulteten,Klinisk neurogenetik,Forskargrupper vid Lunds universitet,Neurology, Lund,Section IV,Department of Clinical Sciences, Lund,Faculty of Medicine,Clinical Neurogenetics,Lund University Research Groups (författare)

Recent studies of THAP1 (DYT6) have pointed out that late-onset focal dystonia can have a genetic basis. Familial late-onset primary dystonia has not been described in African- Americans. Six members of an African American family were affected by focal or segmental dystonia with a mean age at onset of 47 years (range, 45-50). Two additional individuals with milder clinical signs were classified as probably affected. Clinical phenotypes included cervical, laryngeal and handforearm (writer's cramp) dystonia, following an autosomal dominant mode of inheritance. TOR1A (DYT1) and THAP1 (DYT6) were screened for sequence variants. There were no abnormalities in TOR1A. A novel THAP1 sequence variant (c.-237-3G>T) was found in both affected and unaffected family members and did not co-segregate with dystonia. This variant was also found in 1/212 African American control alleles. Another variant at the same site (c.-237-3G>A) was found in 2/212 African American control alleles and one African American subject with laryngeal dystonia (1/84 alleles). Therefore, these variants are unlikely to be pathogenic. Familial late-onset primary dystonia does occur in non-Caucasian populations. Future studies of THAP1 and other dystonia genes must take genetic background into consideration.

MEDICIN OCH HÄLSOVETENSKAP Medicinska och farmaceutiska grundvetenskaper Medicinsk genetik hsv//swe
MEDICAL AND HEALTH SCIENCES Basic Medicine Medical Genetics hsv//eng
alprazolam
African American
focal dystonia
dystonia
allele
segmental dystonia
onset age
Caucasian
writer's cramp
autosomal dominant inheritance
spasmodic dysphonia
inheritance
population
gene
phenotype

Av författaren/redakt...: Puschmann, Andre ...; LeDoux, Mark S.; Xiao, Jianfeng; Bastian, Robert ...; Searcy, Jill A; Wszolek, Zbignie ...

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MEDICIN OCH HÄLSOVETENSKAP: MEDICIN OCH HÄLS ...; och Medicinska och f ...; och Medicinsk geneti ...

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