Affinage

KCND1

A-type voltage-gated potassium channel KCND1 · UniProt Q9NSA2

Length
647 aa
Mass
71.3 kDa
Annotated
2026-04-28
12 papers in source corpus 11 papers cited in narrative 11 extracted findings

Mechanistic narrative

Synthesis pass · prose summary of the discoveries below

KCND1 encodes the Kv4.1 voltage-gated potassium channel α-subunit, which conducts the somatodendritic A-type potassium current (IA) that controls neuronal excitability, firing frequency, and sparse coding across multiple neuron types including dentate granule cells, neostriatal cholinergic interneurons, and spinal nociceptive neurons. Kv4.1 channel properties are modulated by auxiliary subunits KChIP1, KChIP2, and DPP10, which alter inactivation kinetics, activation voltage, current amplitude, and recovery from inactivation (PMID:11423117, PMID:36097791); surface trafficking of Kv4.1 is regulated by CaMKII-dependent phosphorylation at serine 555, a pathway controlled by calbindin-mediated calcium buffering (PMID:34234278). In dentate granule cells, Kv4.1 is essential for low-frequency firing and contextual pattern separation, and its downregulation by oxidative stress contributes to hippocampal hyperexcitability in Alzheimer's disease models (PMID:32047055, PMID:33785038). Hemizygous loss-of-function and missense variants in KCND1 cause an X-linked neurodevelopmental disorder with variant-specific biophysical defects across the channel's cytoplasmic and transmembrane domains (PMID:38772379).

Mechanistic history

Synthesis pass · year-by-year structured walk · 9 steps
  1. 1998 High

    Establishing that Kv4.1 (with Kv4.2) forms the molecular basis of the somatodendritic A-type K+ current in neostriatal cholinergic interneurons resolved the identity of the channel subunits governing slow repetitive firing in these neurons.

    Evidence Whole-cell voltage-clamp, single-cell RT-PCR, immunocytochemistry, and pharmacological dissection in neostriatal cholinergic interneurons

    PMID:9547221

    Open questions at the time
    • Relative contribution of Kv4.1 versus Kv4.2 to the native current was not resolved
    • No knockout or knockdown confirmation
    • Mechanism of subunit heteromerization not addressed
  2. 2001 High

    Demonstrating that KChIP1 directly modulates Kv4.1 gating — accelerating inactivation, shifting activation, increasing amplitude, and speeding recovery — established the principle that auxiliary subunits tune Kv4.1 channel properties, with the N-terminus mediating subunit-specific effects.

    Evidence Heterologous coexpression of KChIP1 with Kv4.1 and Kv4.1/Kv4.2 chimeras, whole-cell electrophysiology

    PMID:11423117

    Open questions at the time
    • Only KChIP1 tested; modulation by other KChIPs or DPPs not examined
    • Structural basis of N-terminus interaction not determined
    • Native neuronal reconstitution not performed
  3. 2009 Medium

    Discovery that Kv4.1 knockdown suppresses proliferation in mammary and gastric cancer cells revealed a non-neuronal role for the channel in cell cycle progression at the G1-S boundary.

    Evidence siRNA knockdown with proliferation assays and flow cytometry in human cancer cell lines

    PMID:19401188 PMID:20930388

    Open questions at the time
    • Mechanism linking K+ conductance to cell cycle not identified
    • No rescue experiment with channel re-expression
    • Single-lab findings for each cancer type
  4. 2019 Medium

    Showing that Kv4.1 uniquely underlies IA in myelinated primary afferent neurons and that its expression is reduced by nerve injury (restored by GDNF) connected Kv4.1 to neuropathic pain mechanisms.

    Evidence Patch clamp, in situ hybridization, L5 spinal nerve ligation and GDNF infusion in rats

    PMID:30868936

    Open questions at the time
    • Correlative — no selective Kv4.1 knockdown in afferents
    • Molecular pathway from GDNF signaling to Kv4.1 transcription not mapped
    • Single lab
  5. 2020 High

    Demonstrating that Kv4.1 determines the low-frequency firing mode of mature dentate granule cells and is required for contextual pattern separation established a causal link between this channel and hippocampal sparse coding.

    Evidence Intracellular antibody block, viral knockdown of Kv4.1 in mouse dentate gyrus, behavioral pattern separation task

    PMID:32047055

    Open questions at the time
    • How Kv4.1 is preferentially enriched in mature versus immature GCs is unknown
    • Contribution of auxiliary subunits in DGCs not addressed
    • Circuit-level mechanism of pattern separation impairment not resolved
  6. 2021 High

    Identification of CaMKII phosphorylation at serine 555 as the mechanism by which calbindin loss reduces Kv4.1 surface expression, causing GC hyperexcitability, provided the first post-translational regulatory mechanism for Kv4.1 trafficking.

    Evidence Calbindin KO mice, surface biotinylation, phospho-specific assays at S555, HT22 cell manipulation, patch clamp

    PMID:34234278

    Open questions at the time
    • Whether other kinases also phosphorylate S555 is unknown
    • Structural consequence of S555 phosphorylation on channel trafficking not determined
    • Phosphatase counter-regulation not identified
  7. 2021 High

    Linking Kv4.1 downregulation to oxidative stress in Tg2576 Alzheimer's mice, with antioxidant rescue of both channel expression and pattern separation, positioned Kv4.1 as a convergence point for Alzheimer's-associated hippocampal dysfunction.

    Evidence Patch clamp, Western blot, RT-PCR, antioxidant rescue, behavioral testing in Tg2576 mice

    PMID:33785038

    Open questions at the time
    • Direct transcriptional or post-transcriptional mechanism of oxidative-stress-mediated Kv4.1 reduction not identified
    • Applicability to human AD not tested
    • Specificity of antioxidant rescue for Kv4.1 versus other channels unclear
  8. 2022 Medium

    Defining the Kv4.1/KChIP2/DPP10 complex in spinal lamina I nociceptive neurons and showing that intrathecal Kv4.1 knockdown causes mechanical hypersensitivity extended the pain role of Kv4.1 from primary afferents to the spinal cord.

    Evidence Immunohistochemistry, antisense oligodeoxynucleotide knockdown, behavioral testing in rats

    PMID:36097791

    Open questions at the time
    • Antisense knockdown lacks subunit selectivity confirmation
    • Electrophysiological characterization in spinal neurons not performed
    • Role of KChIP2/DPP10 in pain modulation via Kv4.1 not functionally tested
  9. 2024 High

    Functional characterization of hemizygous KCND1 variants from patients with X-linked neurodevelopmental disorder established causative genotype–phenotype relationships, showing domain-specific biophysical alterations with and without auxiliary subunits.

    Evidence Trio whole-exome sequencing, heterologous expression with whole-cell electrophysiology ± auxiliary subunits, multi-family cohort

    PMID:38772379

    Open questions at the time
    • No patient-derived neuronal models tested
    • In vivo validation with knock-in animal models absent
    • Therapeutic rescue strategies not explored

Open questions

Synthesis pass · forward-looking unresolved questions
  • Key unresolved questions include the structural basis of auxiliary subunit modulation specific to Kv4.1, the transcriptional regulation underlying neuron-type-specific Kv4.1 expression, and whether Kv4.1-targeted interventions can rescue neurodevelopmental or neurodegenerative phenotypes in vivo.
  • No high-resolution structure of Kv4.1 alone or with auxiliary subunits
  • Transcriptional and epigenetic regulation of KCND1 expression uncharacterized
  • No therapeutic or gene-replacement rescue in animal models of KCND1 disease

Mechanism profile

Synthesis pass · controlled-vocabulary classification · explore literature graph →
Molecular activity
GO:0005215 transporter activity 4
Localization
GO:0005886 plasma membrane 2
Pathway
R-HSA-112316 Neuronal System 3 R-HSA-162582 Signal Transduction 1
Partners
CALB1CAMK2ADPP10KCND2KCNIP1KCNIP2
Complex memberships
Kv4.1/KChIP1 complexKv4.1/KChIP2/DPP10 complex

Evidence

Reading pass · 11 per-paper findings extracted from the source corpus
Year Finding Method Journal Conf PMIDs
2001 KChIP1 (K+ channel-interacting protein 1) directly modulates Kv4.1 channel properties: it accelerates Kv4.1 inactivation kinetics, shifts activation in a depolarizing direction, increases current amplitude, and accelerates recovery from inactivation. The Kv4.1 N-terminus is involved in mediating the differential effects of KChIP1 on Kv4.1 versus Kv4.2, as demonstrated using chimeric constructs. Heterologous expression with whole-cell electrophysiology; chimeric Kv4.1/Kv4.2 constructs to map N-terminus involvement FEBS letters High 11423117
1998 Kv4.1 (together with Kv4.2) is a major subunit of the somatodendritic A-type potassium current in neostriatal cholinergic interneurons. The A-current governs slow, repetitive firing of these interneurons. Coexpression of Kv4.1 and Kv4.2 was established by single-cell RT-PCR, and the biophysical properties (inactivation recovery kinetics) matched those of Kv4.1/Kv4.2 but not Kv1.4. Whole-cell voltage-clamp, single-cell RT-PCR, immunocytochemistry, pharmacological dissection (4-AP, TEA, Cd2+) The Journal of neuroscience High 9547221
2020 Kv4.1 is preferentially expressed in mature dentate granule cells (DGCs) and is the key ion channel regulating low-frequency firing. Intracellular perfusion of Kv4.1 antibody increased firing rates selectively in low-frequency GCs. Kv4.1 knockdown in the dentate gyrus increased firing frequency and impaired contextual pattern separation, placing Kv4.1 as a critical determinant of sparse coding. Immunofluorescence, Western blot, intracellular antibody perfusion during patch clamp, in vivo viral knockdown of Kv4.1 in DG, behavioral testing (contextual discrimination) The Journal of neuroscience High 32047055
2021 Calbindin regulates Kv4.1 surface trafficking and neuronal excitability via CaMKII-dependent phosphorylation at serine 555. In calbindin knockout (CBKO) mice, reduced Ca2+ buffering leads to increased CaMKII activation, decreased surface expression of Kv4.1, reduced K+ current, and hyperexcitability of dentate GCs. This mechanism was confirmed by manipulating calbindin expression in HT22 cells. Calbindin KO mouse model, patch clamp electrophysiology, surface biotinylation, CaMKII phosphorylation assay at S555, cell-line overexpression/knockdown, behavioral testing Experimental & molecular medicine High 34234278
2021 Kv4.1 downregulation in dentate granule cells (DGCs) of Tg2576 Alzheimer's model mice reduces 4-AP-sensitive K+ currents, causing hyperexcitability and impaired pattern separation. Antioxidant treatment restores Kv4.1 protein expression and normalizes hyperexcitability and pattern separation, linking oxidative stress to Kv4.1 downregulation. Whole-cell patch clamp, RT-PCR, Western blot, antioxidant treatment rescue, behavioral pattern separation task in Tg2576 mice Molecular brain High 33785038
2019 Kv4.1 underlies the A-type potassium current (IA) in myelinated primary afferent neurons. Spinal nerve ligation reduces Kv4.1 mRNA and IA current density in injured A-fiber neurons, and spinal GDNF infusion reverses both the reduction in Kv4.1 expression and IA, thereby reducing neuronal hyperexcitability. Among five IA-related Kv subunits examined, only Kv4.1 expression changes paralleled IA changes. In vitro patch clamp, in situ hybridization histochemistry, spinal GDNF infusion, L5 spinal nerve ligation model in rats Molecular pain Medium 30868936
2009 Kv4.1 channel activity is required for cell proliferation in tumorigenic human mammary epithelial cells. siRNA-mediated knockdown of Kv4.1 suppresses proliferation, establishing a functional role for this channel in tumor cell growth. siRNA knockdown, cell proliferation assay, Western blot, mRNA analysis in cancer cell lines and human breast cancer tissues Biochemical and biophysical research communications Medium 19401188
2010 Kv4.1 is required for G1-S cell cycle progression in human gastric cancer cells. siRNA-mediated knockdown of Kv4.1 inhibits proliferation and induces a G1-S transition block, as shown by flow cytometry. siRNA knockdown, flow cytometric cell cycle analysis, Western blot, cell proliferation assay Biological & pharmaceutical bulletin Medium 20930388
2022 Kv4.1 is co-expressed with auxiliary subunits KChIP2 and DPP10 in NK1R+ secondary nociceptive neurons and excitatory interneurons of spinal lamina I. Intrathecal knockdown of Kv4.1 via antisense oligodeoxynucleotide induces mechanical hypersensitivity in naive rats, demonstrating a direct role for Kv4.1 in pain regulation. Immunohistochemistry (antibody localization), antisense oligodeoxynucleotide knockdown, behavioral testing (mechanical/thermal hypersensitivity) European journal of pain Medium 36097791
2024 Hemizygous KCND1 variants (missense and protein-truncating) in the cytoplasmic N- or C-terminus or transmembrane segments S1/S4 of Kv4.1 cause variant-specific alterations in biophysical channel properties. Functional characterization in heterologous expression systems with and without auxiliary β-subunits showed diverse changes in channel function, establishing that Kv4.1 dysfunction underlies an X-linked neurodevelopmental disorder. Trio whole-exome sequencing, heterologous expression, whole-cell electrophysiology with and without auxiliary subunits, gene matching cohort American journal of human genetics High 38772379
2024 SsTx-P2, a 53-amino acid peptide from centipede venom, potently inhibits Kv4.1 channel current with 95% inhibition at 1.0 μmol/L. The peptide shares a conserved helical structure identified by structure prediction. Ion-exchange and HPLC purification, whole-cell patch clamp in HEK293 cells transfected with Kv4.1, MALDI-TOF mass spectrometry, Edman sequencing, structural modeling Journal of Zhejiang University Medical Sciences Medium 38268403

Source papers

Stage 0 corpus · 12 papers · ranked by NIH iCite citations
Year Title Journal Citations PMID
1998 Somatodendritic depolarization-activated potassium currents in rat neostriatal cholinergic interneurons are predominantly of the A type and attributable to coexpression of Kv4.2 and Kv4.1 subunits. The Journal of neuroscience : the official journal of the Society for Neuroscience 187 9547221
2001 Different effects of the Ca(2+)-binding protein, KChIP1, on two Kv4 subfamily members, Kv4.1 and Kv4.2. FEBS letters 34 11423117
2021 Impaired pattern separation in Tg2576 mice is associated with hyperexcitable dentate gyrus caused by Kv4.1 downregulation. Molecular brain 27 33785038
2023 Long non-coding RNA KCND1 protects hearts from hypertrophy by targeting YBX1. Cell death & disease 20 37253771
2020 Kv4.1, a Key Ion Channel For Low Frequency Firing of Dentate Granule Cells, Is Crucial for Pattern Separation. The Journal of neuroscience : the official journal of the Society for Neuroscience 20 32047055
2010 Involvement of Kv4.1 K(+) channels in gastric cancer cell proliferation. Biological & pharmaceutical bulletin 20 20930388
2009 Silencing of Kv4.1 potassium channels inhibits cell proliferation of tumorigenic human mammary epithelial cells. Biochemical and biophysical research communications 20 19401188
2019 Spinal glial cell line-derived neurotrophic factor infusion reverses reduction of Kv4.1-mediated A-type potassium currents of injured myelinated primary afferent neurons in a neuropathic pain model. Molecular pain 18 30868936
2021 Calbindin regulates Kv4.1 trafficking and excitability in dentate granule cells via CaMKII-dependent phosphorylation. Experimental & molecular medicine 10 34234278
2022 K+ channel Kv4.1 is expressed in the nociceptors/secondary nociceptive neurons and participates in pain regulation. European journal of pain (London, England) 3 36097791
2024 Etiological involvement of KCND1 variants in an X-linked neurodevelopmental disorder with variable expressivity. American journal of human genetics 2 38772379
2024 Isolation and structural identification of a potassium ion channel Kv4.1 inhibitor SsTx-P2 from centipede venom. Zhejiang da xue xue bao. Yi xue ban = Journal of Zhejiang University. Medical sciences 1 38268403