A novel epileptic encephalopathy mutation in KCNB1 disrupts Kv2.1 ion selectivity, expression, and localization
Abstract
The epileptic encephalopathies are a group of highly heterogeneous genetic disorders. The majority of disease-causing mutations alter genes encoding voltage-gated ion channels, neurotransmitter receptors, or synaptic proteins. We have identified a novel de novo pathogenic K+ channel variant in an idiopathic epileptic encephalopathy family. Here, we report the effects of this mutation on channel function and heterologous expression in cell lines. We present a case report of infantile epileptic encephalopathy in a young girl, and trio-exome sequencing to determine the genetic etiology of her disorder. The patient was heterozygous for a de novo missense variant in the coding region of the KCNB1 gene, c.1133T>C. The variant encodes a V378A mutation in the α subunit of the Kv2.1 voltage-gated K+ channel, which is expressed at high levels in central neurons and is an important regulator of neuronal excitability. We found that expression of the V378A variant results in voltage-activated currents that are sensitive to the selective Kv2 channel blocker guangxitoxin-1E. These voltage-activated Kv2.1 V378A currents were nonselective among monovalent cations. Striking cell background–dependent differences in expression and subcellular localization of the V378A mutation were observed in heterologous cells. Further, coexpression of V378A subunits and wild-type Kv2.1 subunits reciprocally affects their respectivemore »
- Authors:
-
- Children’s Mercy Hospital, Kansas City, MO (United States)
- Univ. of California, Davis, CA (United States). Dept. of Neurobiology, Physiology and Behavior. Dept. of Physiology and Membrane Biology. Dept. of Anesthesiology and Pain Medicine
- Children’s Mercy Hospital, Kansas City, MO (United States); University of Missouri, Kansas City, MO (United States)
- Children’s Mercy Hospital, Kansas City, MO (United States); Univ. of Missouri, Kansas City, MO (United States)
- University of California, Davis, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); Clare Giannini Fund; National Institutes of Health (NIH)
- OSTI Identifier:
- 1625214
- Grant/Contract Number:
- AC02-05CH11231; R01 NS042225
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of General Physiology
- Additional Journal Information:
- Journal Volume: 146; Journal Issue: 5; Journal ID: ISSN 0022-1295
- Publisher:
- Rockefeller University Press
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES
Citation Formats
Thiffault, Isabelle, Speca, David J., Austin, Daniel C., Cobb, Melanie M., Eum, Kenneth S., Safina, Nicole P., Grote, Lauren, Farrow, Emily G., Miller, Neil, Soden, Sarah, Kingsmore, Stephen F., Trimmer, James S., Saunders, Carol J., and Sack, Jon T. A novel epileptic encephalopathy mutation in KCNB1 disrupts Kv2.1 ion selectivity, expression, and localization. United States: N. p., 2015.
Web. doi:10.1085/jgp.201511444.
Thiffault, Isabelle, Speca, David J., Austin, Daniel C., Cobb, Melanie M., Eum, Kenneth S., Safina, Nicole P., Grote, Lauren, Farrow, Emily G., Miller, Neil, Soden, Sarah, Kingsmore, Stephen F., Trimmer, James S., Saunders, Carol J., & Sack, Jon T. A novel epileptic encephalopathy mutation in KCNB1 disrupts Kv2.1 ion selectivity, expression, and localization. United States. https://doi.org/10.1085/jgp.201511444
Thiffault, Isabelle, Speca, David J., Austin, Daniel C., Cobb, Melanie M., Eum, Kenneth S., Safina, Nicole P., Grote, Lauren, Farrow, Emily G., Miller, Neil, Soden, Sarah, Kingsmore, Stephen F., Trimmer, James S., Saunders, Carol J., and Sack, Jon T. Mon .
"A novel epileptic encephalopathy mutation in KCNB1 disrupts Kv2.1 ion selectivity, expression, and localization". United States. https://doi.org/10.1085/jgp.201511444. https://www.osti.gov/servlets/purl/1625214.
@article{osti_1625214,
title = {A novel epileptic encephalopathy mutation in KCNB1 disrupts Kv2.1 ion selectivity, expression, and localization},
author = {Thiffault, Isabelle and Speca, David J. and Austin, Daniel C. and Cobb, Melanie M. and Eum, Kenneth S. and Safina, Nicole P. and Grote, Lauren and Farrow, Emily G. and Miller, Neil and Soden, Sarah and Kingsmore, Stephen F. and Trimmer, James S. and Saunders, Carol J. and Sack, Jon T.},
abstractNote = {The epileptic encephalopathies are a group of highly heterogeneous genetic disorders. The majority of disease-causing mutations alter genes encoding voltage-gated ion channels, neurotransmitter receptors, or synaptic proteins. We have identified a novel de novo pathogenic K+ channel variant in an idiopathic epileptic encephalopathy family. Here, we report the effects of this mutation on channel function and heterologous expression in cell lines. We present a case report of infantile epileptic encephalopathy in a young girl, and trio-exome sequencing to determine the genetic etiology of her disorder. The patient was heterozygous for a de novo missense variant in the coding region of the KCNB1 gene, c.1133T>C. The variant encodes a V378A mutation in the α subunit of the Kv2.1 voltage-gated K+ channel, which is expressed at high levels in central neurons and is an important regulator of neuronal excitability. We found that expression of the V378A variant results in voltage-activated currents that are sensitive to the selective Kv2 channel blocker guangxitoxin-1E. These voltage-activated Kv2.1 V378A currents were nonselective among monovalent cations. Striking cell background–dependent differences in expression and subcellular localization of the V378A mutation were observed in heterologous cells. Further, coexpression of V378A subunits and wild-type Kv2.1 subunits reciprocally affects their respective trafficking characteristics. A recent study reported epileptic encephalopathy-linked missense variants that render Kv2.1 a tonically activated, nonselective cation channel that is not voltage activated. Our findings strengthen the correlation between mutations that result in loss of Kv2.1 ion selectivity and development of epileptic encephalopathy. However, the strong voltage sensitivity of currents from the V378A mutant indicates that the loss of voltage-sensitive gating seen in all other reported disease mutants is not required for an epileptic encephalopathy phenotype. In addition to electrophysiological differences, we suggest that defects in expression and subcellular localization of Kv2.1 V378A channels could contribute to the pathophysiology of this KCNB1 variant.},
doi = {10.1085/jgp.201511444},
journal = {Journal of General Physiology},
number = 5,
volume = 146,
place = {United States},
year = {Mon Oct 26 00:00:00 EDT 2015},
month = {Mon Oct 26 00:00:00 EDT 2015}
}
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