Journal
NEUROBIOLOGY OF DISEASE
Volume 24, Issue 1, Pages 194-201Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.nbd.2006.06.011
Keywords
BFNC; epilepsy; ion channel; genetics; structure function analysis; voltage clamp
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Funding
- NCRR NIH HHS [M01-RR00039] Funding Source: Medline
- NINDS NIH HHS [NS046484] Funding Source: Medline
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Benign familial neonatal convulsions (BFNC) is an epileptic disorder caused by dominant mutations in the genes KCNQ2 and KCNQ3 encoding the K+ channels K(v)7.2 and K(v)7.3. We identified two novel KCNQ2 mutations in two BFNC families. One mutation predicted a truncated protein (S247X) that lacks the channel's pore region, the other resulted in the amino acid substitution S122L in the S2 segment of Kv7.2. In comparison to wild-type (WT) Kv7.2, functional analysis of S122L mutant channels in Xenopus oocytes revealed a significant positive shift and increased slope of the activation curve leading to significant current reduction in the subthreshold range of an action potential (75% reduction at -50 mV). Our results establish an important role of the K(v)7.2 S2 segment in voltage-dependent channel gating and demonstrate in a human disease that subthreshold voltages are likely to represent the physiologically relevant range for this K+ channel to regulate neuronal firing. (c) 2006 Elsevier Inc. All rights reserved.
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