Frequency and phenotypic spectrum of ataxia with oculomotor apraxia 2: a clinical and genetic study in 18 patients.
Brain
; 127(Pt 4): 759-67, 2004 Apr.
Article
en En
| MEDLINE
| ID: mdl-14736755
ABSTRACT
Ataxia with oculomotor apraxia type 2 (AOA2) is a newly described autosomal recessive cerebellar ataxia (ARCA) defined by genetic location to 9q34 of three families sharing gait ataxia, oculomotor apraxia and/or elevated alpha-foetoprotein (AFP) levels. We have evaluated 77 families with progressive non-Friedreich ARCA and have identified six families with a phenotype suggestive of AOA2. Linkage was confirmed in all six families, with a maximal lod score of 5.91 at D9S1830. We report the first detailed phenotypic study, including neuropsychological, oculographic and brain imaging investigations, in the largest series of AOA2 patients yet recruited. The mean age at onset was 15.1 +/- 3.8 years. Sensory motor neuropathy (92%) and choreic or dystonic movements (44%) were frequent. Oculomotor apraxia was observed in 56% of patients and characterized by increased horizontal saccade latencies and hypometria. AFP levels were elevated in 100% of the families, making it a useful biological marker. This study shows for the first time that AOA2 can be found in Europe, North Africa and the West Indies, and its relative frequency represents approximately 8% of non-Friedreich ARCA, which is more frequent than ataxia telangiectasia and ataxia with oculomotor apraxia type 1 (AOA1), in our series of adult patients. In adults, AOA2 may be, therefore, the most frequent cause of ARCA identified so far, after Friedreich's ataxia.
Buscar en Google
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Apraxias
/
Trastornos de la Motilidad Ocular
/
Ataxia de la Marcha
Tipo de estudio:
Prognostic_studies
Límite:
Adolescent
/
Adult
/
Child
/
Child, preschool
/
Humans
/
Middle aged
Idioma:
En
Revista:
Brain
Año:
2004
Tipo del documento:
Article
País de afiliación:
Francia
Pais de publicación:
ENGLAND
/
ESCOCIA
/
GB
/
GREAT BRITAIN
/
INGLATERRA
/
REINO UNIDO
/
SCOTLAND
/
UK
/
UNITED KINGDOM