De novo KCNH1 mutations in four patients with syndromic developmental delay, hypotonia and seizures View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2016-05

AUTHORS

Ryoko Fukai, Hirotomo Saitsu, Yoshinori Tsurusaki, Yasunari Sakai, Kazuhiro Haginoya, Kazumasa Takahashi, Monika Weisz Hubshman, Nobuhiko Okamoto, Mitsuko Nakashima, Fumiaki Tanaka, Noriko Miyake, Naomichi Matsumoto

ABSTRACT

The voltage-gated Kv10.1 potassium channel, also known as ether-a-go-go-related gene 1, encoded by KCNH1 (potassium voltage-gated channel, subfamily H (eag related), member 1) is predominantly expressed in the central nervous system. Recently, de novo missense KCNH1 mutations have been identified in six patients with Zimmermann-Laband syndrome and in four patients with Temple-Baraitser syndrome. These syndromes were historically considered distinct. Here we report three de novo missense KCNH1 mutations in four patients with syndromic developmental delay and epilepsy. Two novel KCNH1 mutations (p.R357Q and p.R357P), found in three patients, were located at the evolutionally highly conserved arginine in the channel voltage-sensor domain (S4). Another mutation (p.G496E) was found in the channel pore domain (S6) helix, which acts as a hinge in activation gating and mainly conducts non-inactivating outward potassium current. A previously reported p.G496R mutation was shown to produce no voltage-dependent outward current in CHO cells, suggesting that p.G496E may also disrupt the proper function of the Kv channel pore. Our report confirms that KCNH1 mutations are associated with syndromic neurodevelopmental disorder, and also support the functional importance of the S4 domain. More... »

PAGES

381

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/jhg.2016.1

DOI

http://dx.doi.org/10.1038/jhg.2016.1

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1039636306

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/26818738


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