| 1994 |
KCNA1 (Kv1.1) missense point mutations in heterozygous state cause episodic ataxia/myokymia syndrome, establishing KCNA1 as the disease gene for EA1 |
Mutation analysis of KCNA1 coding region in EA1 families; heterologous expression |
Nature genetics |
High |
7842011
|
| 1994 |
Kv1.1 protein localizes to synaptic terminals, juxta-paranodal regions of myelinated axons, unmyelinated axons, cell somata, and proximal dendrites in mouse brain |
Immunocytochemistry/immunohistochemistry with isoform-specific antisera in mouse brain |
The Journal of neuroscience |
High |
8046438
|
| 1994 |
Kv1.1 assembles cotranslationally with other Shaker-like subunits (e.g., Kv1.4) but not with non-Shaker subunits (Kv2.1); N207 glycosylation occurs but is not required for assembly, transport, or function; channel appears as 57–59 kDa doublet reflecting posttranslational processing |
Co-immunoprecipitation from in vitro translations and transfected cells; pulse-chase metabolic labeling; site-directed mutagenesis of glycosylation site; electrophysiology |
The Journal of neuroscience |
High |
8126562
|
| 1995 |
Ca2+-independent phospholipase A2 modulates Kv1.1 channel kinetics through release of arachidonic acid, which accelerates both activation and induces inactivation of Kv1.1 currents |
Intracellular administration of PLA2 and exogenous arachidonic acid in Sf9 cells expressing Kv1.1; whole-cell patch clamp; mechanism-based PLA2 inhibitor controls |
The Journal of biological chemistry |
High |
7852365
|
| 1996 |
Sialic acid addition to Kv1.1 modulates voltage dependence of activation by influencing the local electric field at the voltage sensor; sialidase treatment or elevated Ca2+ shifts activation to more positive voltages, mimicking effects seen in glycosylation-deficient cell lines |
Expression in Lec mutant CHO cells deficient in glycosylation; sialidase treatment; whole-cell patch clamp |
The Journal of biological chemistry |
High |
8702582
|
| 1998 |
EA1 mutations in Kv1.1 impair channel function by two distinct mechanisms: dominant negative effects (most mutations form heteromeric channels with intermediate properties) or haploinsufficiency (R239S and F249I yield minimal protein and current) |
Heterologous expression in Xenopus oocytes; TEA-tagging to distinguish subunit contributions; Western blot for protein levels |
The Journal of neuroscience |
High |
9526001
|
| 1998 |
Kv1.1 knockout mice exhibit hyperalgesia (reduced nociceptive thresholds in paw flick, hot plate, and formalin assays) and blunted morphine antinociception, establishing Kv1.1 as a regulator of nociceptive and antinociceptive signaling |
Behavioral pain assays in Kcna1-null mice (-/-) versus heterozygous (+/-) and wild-type (+/+) littermates |
Neuroscience letters |
High |
9718989
|
| 1998 |
Kv1.1 mRNA is destabilized by cAMP elevation in C6 glioma cells, reducing Kv1.1 protein and outward K+ current, and thereby depolarizing resting membrane potential |
cAMP elevation by pharmacological agents; Northern blot for RNA decay; Western blot; whole-cell patch clamp; dendrotoxin-I pharmacology |
Proceedings of the National Academy of Sciences of the United States of America |
Medium |
9636212
|
| 1999 |
EA1 mutations V408A and E325D in Kv1.1 co-assemble with Kv1.2 to form heteromeric channels with altered kinetics of activation, deactivation, C-type inactivation, and voltage dependence; V408A reduces mean single-channel open duration ~3-fold |
Tandemly linked subunits expressed in Xenopus oocytes; single-channel and macroscopic patch clamp analysis |
FASEB journal |
High |
10428758
|
| 1999 |
Protein kinase C activation inhibits Kv1.1 current by a mechanism requiring a C3 exoenzyme substrate (Rho GTPase pathway) but does not alter channel gating kinetics or promote channel internalization; inhibition is not via direct phosphorylation of Kv1.1 |
PMA application in Xenopus oocytes; PKC inhibitors; site-directed mutagenesis of PKC sites; Western blot; botulinum toxin C3 injection |
The American journal of physiology |
Medium |
10409113
|
| 2000 |
Four EA1 KCNA1 mutations impair delayed-rectifier K+ currents by different mechanisms: some alter gating properties, others cause truncation with dominant negative effects; phenotypic variability correlates with degree and nature of channel dysfunction |
Heterologous expression in Xenopus oocytes; electrophysiology; confocal microscopy of GFP-tagged subunits |
Annals of neurology |
High |
11026449
|
| 2001 |
EA1 missense mutations generate Kv1.1 subunits with normal folding and trafficking, whereas the nonsense truncation mutation causes intracellular aggregation and detergent insolubility that can be transferred to co-assembled Kv1 α- and Kvβ-subunits |
Immunocytochemistry; detergent solubility assays; co-assembly studies in heterologous cells |
The Journal of biological chemistry |
Medium |
11679591
|
| 2002 |
EA1 mutation R417stop (C-terminal truncation) impairs both tetramerization of Kv1.1 with wild-type subunits and membrane targeting of heterotetramers, while typical EA1 mutations (e.g., V404I, P244H) affect only channel kinetics without disrupting assembly or trafficking |
Co-expression in Xenopus oocytes; pharmacological discrimination of subunit contribution; confocal imaging of GFP-tagged subunits |
The Journal of physiology |
High |
11773313
|
| 2002 |
EA1 mutations E325D and V408A destabilize the open state of Kv1.1, increasing deactivation rates ~10-fold, and alter Kvβ1-induced N-type inactivation: inactivation onset is ~2-fold slower and recovery is ~10-fold faster than wild-type |
Heterologous expression with Kvβ1 in Xenopus oocytes; macroscopic and gating current recording; comparison of homomeric and heteromeric channels |
The Journal of neuroscience |
High |
12077175
|
| 2003 |
Kv1.1 subunits contribute approximately half the low-threshold IKL current in auditory MNTB neurons; absence of Kv1.1 (Kcna1-null) reduces IKL amplitude by ~50% and doubles neuronal excitability (more APs, halved threshold current); residual IKL is DTX-sensitive, suggesting Kv1.2/Kv1.6 compensation |
Whole-cell patch clamp in brainstem slices from Kcna1-null and wild-type mice; DTX pharmacology |
The Journal of physiology |
High |
12611922
|
| 2003 |
Glycosylation at the S1-S2 linker affects Kv1.1 gating function but, unlike Kv1.4, does not influence protein stability or cell-surface expression; a pore-region determinant dictates differential glycosylation effects on trafficking between Kv1.1 and Kv1.4 |
N-glycosylation mutants; cell-surface biotinylation; immunocytochemistry; electrophysiology in transfected cells |
The Journal of biological chemistry |
High |
14688283
|
| 2003 |
KCNA1 11-bp deletion (mceph mouse) produces a truncated Kv1.1 that retains only N-terminal assembly domains, sequesters Kv1.2 and Kv1.3 subunits, reduces their protein levels in hippocampus, and causes seizures and megalencephaly |
Positional cloning; immunoblot for Kv1.2 and Kv1.3; immunohistochemistry; EEG |
The European journal of neuroscience |
Medium |
14686897
|
| 2005 |
Human Kv1.1 is palmitoylated at C243 in the S2-S3 cytosolic linker; preventing palmitoylation at C243 causes a 20-mV leftward shift in the current-voltage relationship, indicating palmitoylation modulates voltage sensing |
[3H]palmitate radiolabeling; chemical stability studies; site-directed mutagenesis; whole-cell patch clamp in Sf9 cells |
Proceedings of the National Academy of Sciences of the United States of America |
High |
15837928
|
| 2003 |
Absence of Kv1.1 in Kcna1-null mice reduces temporal precision of auditory signaling: increased first-spike latency jitter in VCN bushy cells, calyceal terminals, and MNTB neurons in vivo, and reduced ability to follow high-frequency amplitude-modulated stimulation |
In vivo single-unit recordings from VCN and MNTB neurons in Kcna1-null vs. wild-type mice |
The Journal of neuroscience |
High |
14534254
|
| 2006 |
mTOR activity suppresses Kv1.1 mRNA translation in dendrites; inhibition of mTOR (rapamycin) or NMDA receptors increases dendritic Kv1.1 protein and surface expression without altering axonal expression; endogenous Kv1.1 mRNA is present in dendrites |
Live imaging of Kaede-Kv1.1 reporter for local synthesis; rapamycin treatment; surface biotinylation; immunostaining in hippocampal neurons |
Science |
High |
17023663
|
| 2006 |
Kv1.1-containing channels (identified by DTX-K) underlie IKL in MNTB neurons and are critical for temporal precision of action potential initiation; pharmacological or genetic reduction of Kv1.1 increases AP latency jitter, particularly during rapid stimulation (100-500 Hz) |
Pharmacology with DTX-K at selective concentrations; whole-cell patch clamp in Kcna1-/- mouse brain slices; comparison of genetic and pharmacological IKL reduction |
Journal of neurophysiology |
High |
16672305
|
| 2006 |
EA1 mutations E325D, V404I, V408A, and I177N alter N-type inactivation and repriming properties of heteromeric Kv1.4-Kv1.1/Kvβ1.1 and Kv1.4-Kv1.1/Kvβ1.2 channels, decreasing inactivation rate and accelerating recovery from inactivation |
Tandemly linked subunits in Xenopus oocytes; two-electrode voltage clamp |
The European journal of neuroscience |
High |
17156368
|
| 2003 |
PKA activation phosphorylates intracellular Kv1.1 protein and promotes its rapid translocation to the plasma membrane, increasing current amplitude and altering voltage dependence of activation; PKC activation does not directly phosphorylate Kv1.1 but induces Kv1.1 protein synthesis |
Patch clamp in stably transfected HEK293 cells; PKA/PKC activators; phosphorylation assays |
Neuropharmacology |
Medium |
12681381
|
| 2008 |
Kvβ1 is a functional aldoketoreductase; oxidation of Kvβ1-bound NADPH cofactor (enzymatically or by H2O2/NADP+) induces a large increase in Kv1.1 open-channel current; the rate of cofactor oxidation is regulated by membrane potential (~2-fold faster at 0 mV vs. -100 mV), linking metabolic state to channel function |
In vitro aldoketoreductase assay for Kvβ1; electrophysiology with NADP+/H2O2 application; site-directed mutagenesis of catalytic site; whole-cell patch clamp |
The Journal of biological chemistry |
High |
18222921
|
| 2009 |
A KCNA1 N255D mutation causes autosomal dominant hypomagnesemia; Kv1.1 is expressed in the distal convoluted tubule where it colocalizes with TRPM6 at the luminal membrane, and N255D produces a non-functional channel with dominant negative effect on wild-type Kv1.1, disrupting the membrane potential needed for TRPM6-mediated Mg2+ reabsorption |
Positional cloning; immunolocalization in kidney; patch clamp in human kidney cell line; overexpression studies |
The Journal of clinical investigation |
High |
19307729
|
| 2009 |
Asparagine at position 255 in the S3 transmembrane segment of Kv1.1 is essential for normal voltage dependence and gating kinetics; charged or bulky substitutions (N255D, N255E, N255Q) abolish ion conduction while other substitutions shift activation to more negative potentials and alter kinetics |
Systematic mutagenesis at N255; cell surface biotinylation; whole-cell patch clamp in HEK293 cells |
The Journal of biological chemistry |
High |
19903818
|
| 2010 |
Kv1.1 deficiency (Kcna1-null) causes brain-driven cardiac dysfunction including AV conduction blocks, bradycardia, and premature ventricular contractions; these arise from excessive parasympathetic tone (reversed by atropine but not propranolol); Kv1.1 is expressed in juxtaparanodes of the vagus nerve, suggesting it regulates parasympathetic outflow to the heart |
Simultaneous video EEG-ECG recordings; selective autonomic pharmacological blockade (atropine/propranolol); immunohistochemistry of vagus nerve; cardiac structural analysis |
The Journal of neuroscience |
High |
20392939
|
| 2011 |
NRG1 acting through ErbB4 increases intrinsic excitability of fast-spiking parvalbumin interneurons by increasing near-threshold responsiveness and decreasing action potential voltage threshold through Kv1.1 |
Whole-cell patch clamp in ErbB4 conditional knockout mice; pharmacological manipulation of Kv1.1; seizure susceptibility models |
Nature neuroscience |
High |
22158511
|
| 2013 |
mTOR-dependent regulation of Kv1.1 mRNA translation in dendrites involves two opposing mechanisms: when mTORC1 is active, miR-129 represses Kv1.1 mRNA translation; when mTORC1 is inhibited, degradation of high-affinity HuD target mRNAs frees HuD to bind and promote Kv1.1 mRNA translation |
miRNA identification; HuD RNA-binding protein binding assays; mTOR inhibition studies; polysome profiling; reporter assays in neurons |
The Journal of cell biology |
High |
23836929
|
| 2013 |
Kv1.1 acts as a mechanosensitive brake in sensory neurons: mechanosensitivity is attributed to Kv1.1 subunits in Kv1.1-Kv1.2 heteromers through facilitation of voltage-dependent open probability; IKmech expression in C-HTMRs opposes slow MS cation currents, setting mechanical firing threshold; Kv1.1 dominant negative or inhibition causes mechanical allodynia without heat hyperalgesia |
Toxin profiling; transgenic mouse studies; patch clamp of DRG neurons; Kv1.1 dominant negative expression; behavioral assays |
Neuron |
High |
23473320
|
| 2013 |
Loss of Kv1.1 in Kcna1-null hippocampus increases presynaptic neurotransmitter release at mossy fiber and perforant path terminals (reduced paired-pulse ratios, enhanced postsynaptic responses), which reduces spike timing reliability of CA3 principal cells and promotes pathological high-frequency oscillations |
Multielectrode array extracellular recordings; micro-dissection experiments; DTX-κ pharmacology in wild-type slices |
Neurobiology of disease |
High |
23466697
|
| 2013 |
KCNA1 expression is induced by oncogenic stress, and Kv1.1 relocates from cytoplasm to plasma membrane upon loss of PKA-dependent phosphorylation at S446; membrane-localized Kv1.1 changes membrane potential and triggers cellular senescence; phosphomimetic S446 mutant maintains cytoplasmic localization and allows OIS escape |
Loss-of-function genetic screen; subcellular fractionation; mutagenesis of S446; membrane potential measurements; transformation assays |
Cancer research |
Medium |
23774215
|
| 2003 |
KCNE4 β-subunit exerts a drastic inhibitory effect specifically on Kv1.1 and Kv1.3 homomeric currents and on Kv1.1/Kv1.2 and Kv1.2/Kv1.3 heteromeric currents but not on Kv1.2, Kv1.4, Kv1.5, or Kv4.3; Kv1.1 and KCNE4 colocalize at the cell surface |
Heterologous expression in Xenopus oocytes and HEK293 cells; electrophysiology; confocal microscopy; Western blot |
Biophysical journal |
High |
12944270
|
| 2011 |
Kv1.1 (V408A/+) knock-in mice exhibit spontaneous myokymic discharges originating from motor nerve axons independent of neuromuscular junction; the V408A mutation causes abnormal spontaneous Ca2+ signals in motor nerve axons; fatigue, ischemia, and low temperature exacerbate myokymic activity |
In vivo nerve-muscle preparations; two-photon laser scanning microscopy of Ca2+ signals; nerve axotomy experiments; EMG recordings |
Neurobiology of disease |
High |
22609489
|
| 2014 |
Following kainic-acid induced status epilepticus, Kv1.1 expression is suppressed in two phases: (1) initial mTOR-dependent suppression (reversed by rapamycin) followed by (2) persistent miR-129-5p-mediated translational repression independent of mTOR; reduced Kv1.1 in CA1 pyramidal neurons lowers action potential firing threshold |
Kainic acid TLE model; rapamycin treatment; miR-129-5p quantification; patch clamp recordings from CA1 neurons |
Neurobiology of disease |
High |
25270294
|
| 2017 |
Pharmacological or genetic deletion of Kv1.1 broadens presynaptic spike width; an EA1 heterozygous dominant Kv1.1 mutation (V408A) similarly broadens basal presynaptic spike shape but, unlike deletion, abolishes spike width modulation by subthreshold somatic depolarization, suggesting disruption of normal presynaptic Kv1 channel stoichiometry |
Scanning ion conductance microscopy to record from intact small synaptic boutons; pharmacological Kv1.1 blockade; heterozygous Kv1.1 V408A knock-in mice |
Proceedings of the National Academy of Sciences of the United States of America |
High |
28193892
|
| 2018 |
Patient-derived LGI1 antibodies disrupt LGI1 interaction with ADAM23 (presynaptic) and ADAM22 (postsynaptic), causing decreased synaptic Kv1.1 levels before AMPA receptor reduction, leading to neuronal hyperexcitability, increased presynaptic glutamate release, and impaired LTP |
Patient IgG cerebroventricular transfer in mice; confocal analysis of hippocampal slices; patch clamp of dentate gyrus and CA1 neurons; field potential LTP recordings |
Brain : a journal of neurology |
High |
30346486
|
| 2020 |
Neuron-specific deletion of Kcna1 (using Synapsin1-Cre) is sufficient to cause epilepsy, premature death, and cardiorespiratory dysregulation, demonstrating that brain-driven (not cardiac-intrinsic) Kv1.1 deficiency underlies SUDEP risk; residual Kv1.1 in cerebellum (where Synapsin1-Cre is less active) may modulate ictal cardiorespiratory dysfunction |
Conditional knockout (floxed Kcna1 × Synapsin1-Cre); EEG, ECG, plethysmography; survival analysis; heart rate variability analysis |
Neurobiology of disease |
High |
31978607
|
| 2011 |
RNA editing of Kv1.1 at position I400V (Ile→Val) in the S6 segment generates 4-aminopyridine-insensitive channels; editing ratio is increased ~4-fold in the entorhinal cortex of chronic epileptic rats, reducing ictogenic potential of 4-AP |
Sequencing of RNA editing in kainic acid model; electrophysiology of I400V channels in Xenopus oocytes |
Epilepsia |
Medium |
21371023
|
| 2018 |
KCNA1 L319R mutation accelerates protein degradation via the proteasome pathway and disrupts Kv1.1 membrane expression; both L319R and N255K mutations reduce K+ currents with altered gating and dominant negative effect, causing familial paroxysmal kinesigenic dyskinesia |
Whole-exome sequencing; proteasome inhibitor experiments; patch clamp in HEK293 cells; dominant-negative co-expression |
Human molecular genetics |
Medium |
29294000
|
| 2005 |
Kv1.1 deletion augments carotid body chemosensory discharge during hypoxia and increases frequency of spontaneous and miniature EPSCs in nucleus tractus solitarius neurons, demonstrating Kv1.1 regulates afferent hypoxic chemosensory pathway and respiratory control |
Plethysmography; in vitro carotid body sensory discharge recordings; whole-cell patch clamp of NTS neurons in brainstem slices; immunohistochemistry |
The Journal of neuroscience |
High |
15800194
|
| 2007 |
Mu opioid receptor activation inhibits GABAergic inputs to basolateral amygdala neurons through presynaptic Kv1.1/1.2 channels; selective Kv1.1 blocker (DTX-K) abolishes DAMGO's inhibitory effect on mIPSCs; Kv1.1 and Kv1.2 colocalize with synaptophysin in BLA |
Whole-cell voltage clamp with selective toxin blockers (DTX-K for Kv1.1, tityustoxin-Kα for Kv1.2); double immunofluorescence with synaptophysin |
Journal of neurophysiology |
Medium |
16306173
|
| 2007 |
Nitric oxide increases GABAergic mIPSC frequency to PVN presympathetic neurons through cGMP/PKG signaling acting downstream on presynaptic Kv1.1/1.2 channels; selective blockade of Kv1.1 (DTX-K) or Kv1.2 abolishes NO-induced potentiation of GABA release |
Whole-cell patch clamp in PVN brain slices; selective Kv channel blockers; 8-Br-cADPR controls; immunofluorescence for Kv1.1/Kv1.2 and synaptophysin |
Neuroscience |
Medium |
17869444
|
| 2010 |
Kv1.1 and Kv1.3 channels contribute to RGC degeneration after optic nerve transection through different apoptotic pathways: Kv1.1 siRNA knockdown increases antiapoptotic Bcl-XL, while Kv1.3 siRNA reduces proapoptotic caspase-3, caspase-9, and Bad |
siRNA knockdown via intraocular injection with retrograde transport to RGCs; quantitative RT-PCR; immunohistochemistry; cell death counting |
Cell death and differentiation |
Medium |
19696788
|