The pleiotropic movement disorders phenotype of adult ataxia-telangiectasia

Abstract : OBJECTIVE: To assess the clinical spectrum of ataxia-telangiectasia (A-T) in adults, with a focus on movement disorders. METHODS: A total of 14 consecutive adults with A-T were included at 2 tertiary adult movement disorders centers and compared to 53 typical patients with A-T. Clinical evaluation, neurophysiologic and video-oculographic recording, imaging, laboratory investigations, and ATM analysis were performed. RESULTS: In comparison with typical A-T cases, our patients demonstrated later mean age at onset (6.1 vs 2.5 years, p < 0.0001), later loss of walking ability (p = 0.003), and longer survival (p = 0.0039). The presenting feature was ataxia in 71% and dysarthria and dystonia in 14% each. All patients displayed movement disorders, among which dystonia and subcortical myoclonus were the most common (86%), followed by tremor (43%). Video-oculographic recordings revealed mostly dysmetric saccades and 46% of patients had normal latencies (i.e., no oculomotor apraxia) and velocities. The α-fetoprotein (AFP) level was normal in 7%, chromosomal instability was found in 29% (vs 100% of typical patients, p = 0.0006), and immunoglobulin deficiency was found in 29% (vs 69%, p = 0.057). All patients exhibited 2 ATM mutations, including at least 1 missense mutation in 79% of them (vs 36%, p = 0.0067). CONCLUSION: There is great variability of phenotype and severity in A-T, including a wide spectrum of movement disorders. Karyotype and repeated AFP level assessments should be performed in adults with unexplained movement disorders as valuable clues towards the diagnosis. In case of a compatible phenotype, A-T should be considered even if age at onset is late and progression is slow
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https://hal.umontpellier.fr/hal-02436440
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Soumis le : lundi 13 janvier 2020 - 09:39:01
Dernière modification le : lundi 27 janvier 2020 - 13:16:05

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A. Meneret, Y. Ahmar-Beaugendre, G. Rieunier, N. Mahlaoui, B. Gaymard, et al.. The pleiotropic movement disorders phenotype of adult ataxia-telangiectasia. Neurology, American Academy of Neurology, 2014, 83 (12), pp.1087-1095. ⟨10.1212/WNL.0000000000000794⟩. ⟨hal-02436440⟩

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