2019
An Epilepsy-Associated KCNT1 Mutation Enhances Excitability of Human iPSC-Derived Neurons by Increasing Slack KNa Currents
Quraishi IH, Stern S, Mangan KP, Zhang Y, Ali SR, Mercier MR, Marchetto MC, McLachlan MJ, Jones EM, Gage FH, Kaczmarek LK. An Epilepsy-Associated KCNT1 Mutation Enhances Excitability of Human iPSC-Derived Neurons by Increasing Slack KNa Currents. Journal Of Neuroscience 2019, 39: 7438-7449. PMID: 31350261, PMCID: PMC6759030, DOI: 10.1523/jneurosci.1628-18.2019.Peer-Reviewed Original ResearchConceptsSevere epileptic encephalopathyAction potentialsEpileptic encephalopathyFiring rateCurrent-clamp recordingsSodium-activated potassium channelsMaximal firing rateIntensity of firingMean firing rateKCNT1 mutationsCortical neuronsCell-autonomous mechanismsEffective treatmentHuman neuronsPotassium currentActive neuronsNeuronsPotassium channelsCompensatory changesDisease-causing mutationsHyperexcitabilityHuman iPSCEncephalopathyExcitabilityStem cells
2024
Molecular Profiling of Mouse Models of Loss or Gain of Function of the KCNT1 (Slack) Potassium Channel and Antisense Oligonucleotide Treatment
Sun F, Wang H, Wu J, Quraishi I, Zhang Y, Pedram M, Gao B, Jonas E, Nguyen V, Wu S, Mabrouk O, Jafar-nejad P, Kaczmarek L. Molecular Profiling of Mouse Models of Loss or Gain of Function of the KCNT1 (Slack) Potassium Channel and Antisense Oligonucleotide Treatment. Biomolecules 2024, 14: 1397. PMID: 39595574, PMCID: PMC11591899, DOI: 10.3390/biom14111397.Peer-Reviewed Original ResearchWild-type miceKO miceSpectrum of epilepsy syndromesAntisense oligonucleotidesGain-of-function variantsAntisense oligonucleotide treatmentEpileptic phenotypePotassium channelsKCNT1Molecular profilingOligonucleotide treatmentAnimal modelsEpilepsy syndromesC-terminal mutationsIncreased expressionCerebral cortexMiceExpression of multiple proteinsComprehensive proteomic analysisDisease modelsCortical mitochondriaMolecular differencesDensity of mitochondrial cristaeMitochondrial membraneTreatmentDisease-causing Slack potassium channel mutations produce opposite effects on excitability of excitatory and inhibitory neurons
Wu J, Quraishi I, Zhang Y, Bromwich M, Kaczmarek L. Disease-causing Slack potassium channel mutations produce opposite effects on excitability of excitatory and inhibitory neurons. Cell Reports 2024, 43: 113904. PMID: 38457342, PMCID: PMC11013952, DOI: 10.1016/j.celrep.2024.113904.Peer-Reviewed Original ResearchInhibitory neuronsRegulation of neuronal excitabilityPotassium channel mutationsVoltage-dependent sodiumInhibitory cortical neuronsGain-of-function mutationsAxon initial segmentKCNT1 geneNeuronal excitabilityChannel subunitsChannel mutationsNetwork hyperexcitabilityMouse modelNeuron typesCortical neuronsTreat epilepsyNeuronsExcitable neuronsNeurological disordersSevere intellectual disabilityMutationsInitial segmentKCNT1ExpressionHyperexcitabilitySlack (KCNT1) potassium channels regulate levels of proteins of the inner mitochondrial membrane
Wang H, Wu J, Sun F, Wu S, Jafar-nejad P, Quraishi I, Pedram M, Kaczmarek L. Slack (KCNT1) potassium channels regulate levels of proteins of the inner mitochondrial membrane. Biophysical Journal 2024, 123: 250a. DOI: 10.1016/j.bpj.2023.11.1582.Peer-Reviewed Original Research
2021
Suppression of Kv3.3 channels by antisense oligonucleotides reverses biochemical effects and motor impairment in spinocerebellar ataxia type 13 mice
Zhang Y, Quraishi IH, McClure H, Williams LA, Cheng Y, Kale S, Dempsey GT, Agrawal S, Gerber DJ, McManus OB, Kaczmarek LK. Suppression of Kv3.3 channels by antisense oligonucleotides reverses biochemical effects and motor impairment in spinocerebellar ataxia type 13 mice. The FASEB Journal 2021, 35: e22053. PMID: 34820911, PMCID: PMC8630780, DOI: 10.1096/fj.202101356r.Peer-Reviewed Original ResearchConceptsHAX-1Wild-type animalsMultivesicular bodiesKv3.3 channelsLate endosomes/multivesicular bodiesTank Binding Kinase 1Type animalsCell survival proteinsDisease-causing mutationsVoltage-dependent potassium channelsSpinocerebellar ataxia type 13Survival proteinsKinase 1Mature intact animalsTBK1 activationAge-matched wild-type animalsLevels of CD63Progressive cerebellar degenerationWild-type miceMutationsProtein levelsMutant micePotassium channelsDependent potassium channelsType mice
2020
Impaired motor skill learning and altered seizure susceptibility in mice with loss or gain of function of the Kcnt1 gene encoding Slack (KNa1.1) Na+-activated K+ channels
Quraishi IH, Mercier MR, McClure H, Couture RL, Schwartz ML, Lukowski R, Ruth P, Kaczmarek LK. Impaired motor skill learning and altered seizure susceptibility in mice with loss or gain of function of the Kcnt1 gene encoding Slack (KNa1.1) Na+-activated K+ channels. Scientific Reports 2020, 10: 3213. PMID: 32081855, PMCID: PMC7035262, DOI: 10.1038/s41598-020-60028-z.Peer-Reviewed Original ResearchConceptsMaximum electroshock-induced seizuresEpilepsy of infancyPentylenetetrazole-induced seizuresVideo-EEG monitoringElectroshock-induced seizuresForms of epilepsyWild-type miceSlack channelsImpaired motor skillsProcedural motor learningMotor skillsWild-type animalsSevere intellectual disabilityOpen-field behaviorCortical seizuresKCNT1 geneSpontaneous seizuresFocal seizuresSeizure susceptibilitySeizure activityType miceMouse modelAnimal modelsInterictal spikesSeizures
2014
Human Slack Potassium Channel Mutations Increase Positive Cooperativity between Individual Channels
Kim GE, Kronengold J, Barcia G, Quraishi IH, Martin HC, Blair E, Taylor JC, Dulac O, Colleaux L, Nabbout R, Kaczmarek LK. Human Slack Potassium Channel Mutations Increase Positive Cooperativity between Individual Channels. Cell Reports 2014, 9: 1661-1672. PMID: 25482562, PMCID: PMC4294418, DOI: 10.1016/j.celrep.2014.11.015.Peer-Reviewed Original Research
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