Abstract：
PURPOSE:Acute encephalopathy is the most serious complication of pediatric viral infections, such as influenza and exanthema subitum. It occurs worldwide, but is most prevalent in East Asia. Recently, there have been sporadic case reports of epilepsy/febrile seizure and acute encephalopathy with a neuronal sodium channel alpha 1 subunit (SCN1A) mutation. To determine whether SCN1A mutations are a predisposing factor of acute encephalopathy, we sought to identify SCN1A mutations in a large case series of acute encephalopathy including various syndromes. METHODS:We analyzed the SCN1A gene in 87 patients with acute encephalopathy, consisting of 20 with acute necrotizing encephalopathy (ANE), 61 with acute encephalopathy with biphasic seizures and late reduced diffusion (AESD), and six with nonspecific (unclassified) acute encephalopathy. KEY FINDINGS:Three patients had distinct point mutations. Two of them had epileptic seizures prior to acute encephalopathy. Clinical and neuroradiologic findings of acute encephalopathy were diverse among the three patients, although all had a prolonged and generalized seizure at its onset. The first patient with V982L had partial epilepsy and AESD. The second patient with M1977L had febrile seizures and nonspecific acute encephalopathy. The third patient with R1575C had no seizures until the onset of ANE. M1977L was a novel mutation, whereas the remaining two, V982L and R1575C, have previously been reported in cases of Dravet syndrome and acute encephalopathy, respectively. SIGNIFICANCE:These findings provide further evidence that SCN1A mutations are a predisposing factor for the onset of various types of acute encephalopathy.
journal_name
Epilepsiajournal_title
Epilepsiaauthors
Saitoh M,Shinohara M,Hoshino H,Kubota M,Amemiya K,Takanashi JL,Hwang SK,Hirose S,Mizuguchi Mdoi
10.1111/j.1528-1167.2011.03402.xsubject
Has Abstractpub_date
2012-03-01 00:00:00pages
558-64issue
3eissn
0013-9580issn
1528-1167journal_volume
53pub_type
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