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Class III antiarrhythmic drugs are a group of medications that can prolong action potentials in the heart. They achieve this by blocking potassium channels or enhancing inward currents from sodium channels. However, these drugs have a unique property of "reverse use-dependence," which is most pronounced at slower heart rates and can lead to torsades de pointes—a specific type of arrhythmia. However, it is essential to note that excessive QT interval prolongation—a measure of...
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Consider an external electric field propagating through a homogeneous medium. When the electric field crosses the surface boundary of the medium, it undergoes a discontinuity. The electric field can be resolved into normal and tangential components. The amount by which the field changes at any boundary is given by the difference between the field components above and below the surface boundary.
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Electrostatic Tuning of a Potassium Channel in Electric Fish.

Immani Swapna1, Alfredo Ghezzi2, Julia M York3

  • 1Department of Neuroscience, The University of Texas at Austin, Austin, TX 78712, USA; Department of Integrative Biology, The University of Texas at Austin, Austin, TX 78712, USA.

Current Biology : CB
|June 26, 2018
PubMed
Summary

Molecular variation drives adaptive evolution. A novel potassium channel gene in electric fish, under positive selection, shapes electric organ discharge by shortening action potentials through a unique negative charge patch.

Keywords:
RNA-seqbiophysicselectric fishelectric organevolutionkv1.7membrane surface chargemormyridpotassium channel

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Area of Science:

  • Evolutionary biology
  • Neuroscience
  • Molecular biology

Background:

  • Molecular variation is crucial for adaptive phenotypes, but its precise mechanisms are often unclear.
  • Electric organ discharge (EOD) in weakly electric fish is a key adaptive behavior directly influenced by ion channel biophysics.

Purpose of the Study:

  • To identify and characterize a voltage-gated potassium channel gene under positive selection in African electric fishes.
  • To elucidate the molecular basis for the channel's role in shaping electric organ action potentials and EOD behavior.

Main Methods:

  • Phylogenetic analysis to detect positive selection on ion channel genes.
  • Gene expression analysis in electric organs.
  • Electrophysiological studies to assess channel function and biophysical properties.

Main Results:

  • A novel voltage-gated potassium channel gene was identified, showing positive selection and high expression in the electric organ.
  • This channel accelerates action potential repolarization by activating at hyperpolarized potentials, attributed to a derived negative amino acid patch.
  • The negative patch influences global surface charge, impacting channel gating, rather than through local amino acid interactions.

Conclusions:

  • The identified potassium channel plays a significant role in shaping the adaptive electric organ discharge behavior.
  • A derived negative charge patch in an extracellular loop is a key evolutionary innovation for tuning voltage-dependent channel function.
  • This mechanism may represent a broader strategy for evolutionary adaptation of voltage-gated channels across different species.