Lance Sean, Mossman Stuart, Poke Gemma
Wellington Hospital, Wellington, New Zealand.
Case Rep Neurol Med. 2018 Mar 11;2018:5802650. doi: 10.1155/2018/5802650. eCollection 2018.
Episodic ataxia is a heterogenous group of uncommon neurological disorders characterised by recurrent episodes of vertigo, dysarthria, and ataxia for which a variety of different genetic variations have been implicated. Episodic ataxia type two (EA2) is the most common and also has the largest number of identified causative genetic variants. Treatment with acetazolamide is effective in improving symptoms, so accurate diagnosis is essential. However, a large proportion of patients with EA2 have negative genetic testing. We present a patient with a typical history of EA2 who had a novel variant in the CACNA1A gene not previously described. Report of such variations is important in learning more about the disease and improving diagnostic yield for the patient.
发作性共济失调是一组异质性的罕见神经系统疾病,其特征为眩晕、构音障碍和共济失调反复发作,多种不同的基因变异与之相关。发作性共济失调2型(EA2)最为常见,且已鉴定出的致病基因变异数量最多。乙酰唑胺治疗对改善症状有效,因此准确诊断至关重要。然而,很大一部分EA2患者的基因检测结果为阴性。我们报告了一名具有典型EA2病史的患者,其CACNA1A基因存在一种先前未描述的新变异。报告此类变异对于进一步了解该疾病和提高患者的诊断率具有重要意义。