Characteristics of epilepsy in patients with Kabuki syndrome with KMT2D mutations.

Abstract:

BACKGROUND:The characteristics of epilepsy in patients with Kabuki syndrome with KMT2D mutations (KABUK1) have not yet been well documented. This is the first review to explore this. MATERIALS & METHODS:We enrolled 14 patients with KABUK1, whose median age was 13.6years (range=4.1-21.3years). Their medical records from October 1981 to May 2016 were retrospectively analyzed. RESULTS:Epilepsy was present in 5 (36%) patients. Four of these patients presented with nonsense mutations and one with missense mutations. None presented with brain abnormalities. Four patients presented with annual or monthly focal seizures, of which three evolved to bilateral convulsive seizures. Median onset age of focal epilepsy was 11.8years (range=9.5-12.8years). One presented with monthly myoclonic seizures from age 11.2, whose mother with no other KABUK1 features, had focal epilepsy. The cumulative incidence of epilepsy related to KABUK1 up until age 13 was 45%. Interictal electroencephalogram revealed focal paroxysmal epileptiform discharges (in frontal, central, and parietal regions) in three patients, diffuse high-voltage spike-and-waves in one patient, and normal sleep record in one patient. Myoclonic seizures were rapidly controlled by levetiracetam. In contrast, focal seizures were not controlled in the early period of antiepileptic therapy. CONCLUSION:This long-term follow-up of patients with KABUK1 revealed a higher prevalence of epilepsy than previously reported. The age of epilepsy onset and rate of focal seizures evolving to bilateral convulsive seizures in KABUK1 were also higher than previously reported in patients with clinically diagnosed Kabuki syndrome. Although seizure outcome is reported to be favorable in Kabuki syndrome, focal seizures in patients with KABUK1 were not immediately responsive to medication.

journal_name

Brain Dev

journal_title

Brain & development

authors

Kurahashi N,Miyake N,Mizuno S,Koshimizu E,Kurahashi H,Yamada K,Natsume J,Aoki Y,Nakamura M,Taniai H,Maki Y,Abe-Hatano C,Matsumoto N,Maruyama K

doi

10.1016/j.braindev.2017.03.025

subject

Has Abstract

pub_date

2017-09-01 00:00:00

pages

672-677

issue

8

eissn

0387-7604

issn

1872-7131

pii

S0387-7604(17)30085-2

journal_volume

39

pub_type

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