Cited by 51Ion channel regulation and functionCardiac electrophysiology and arrhythmiasIon Transport and Channel Regulation

Functional evolution of Erg potassium channel gating reveals an ancient origin for I Kr

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Martinson, Alexandra S., van Rossum, Damian B., Diatta, Fortunay H., Layden, Michael J., Rhodes, Sarah A., Martindale, Mark Q., Jegla, Timothy·2014·Proceedings of the National Academy of Sciences

Abstract

Significance: Ether-a-go-go related gene (Erg) family K + channels regulate excitability of muscle and neurons. However, mammalian and Drosophila Erg channels have distinctive gating phenotypes, suggesting divergent physiological roles. We examined the origins of Erg channel gating properties by investigating the functional evolution of the Erg family in Eumetazoa. We find that the mammalian I Kr -like Erg channel phenotype is ancestral. Thus, the gating features that specialize Erg1 for cardiac action potential repolarization may have had their origins in the slow wave contractions of early metazoans. These gating features, inactivation and slow deactivation, have been lost in the Drosophila Erg, Caenorhabditis elegans Erg, and some sea anemone ( Nematostella ) Ergs. Loss of the Ether-a-go-go domain, which regulates channel closing, accompanies and may in part explain phenotypic conversion.

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  • All three EAG subfamilies seem to have at least partially conserved molecular functions, when tested in vitro.

    “All three subfamilies seem to have at least partially conserved molecular functions, when tested in vitro [79,81].”

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Authors
Martinson, A. S., van Rossum, D. B., Diatta, F. H., Layden, M. J., Rhodes, S. A., Martindale, M. Q., & Jegla, T.
Affiliations
  • Pennsylvania State University (US)
  • Department of Biology and Huck Institute of the Life Sciences, Pennsylvania State University, University Park, PA 16803; and
  • University of Florida (US)
Venue
Proceedings of the National Academy of Sciences
Published
2014-03-31
Volume
111
Issue
15
Pages
5712-5717
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2008522479
Cited by
51
References
46
Citations by year
2026: 2 · 2025: 6 · 2024: 3 · 2023: 3 · 2022: 3 · 2021: 2 · 2020: 4 · 2019: 3 · 2018: 3 · 2017: 4 · 2016: 4 · 2015: 10 · 2014: 3 · 2013: 1
FWCI
2.87
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institute of General Medical Sciences (R01GM093116)
  • National Institute of Neurological Disorders and Stroke (R01NS069842)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion channel regulation and function
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiac electrophysiology and arrhythmias
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion Transport and Channel Regulation
Keywords
voltage-gated potassium channels, IKr, channel gating, functional evolution, Nematostella vectensis, voltage-dependent inactivation, cardiac repolarization, ancestral function, Cnidaria, bilaterians, paralogs
MeSH terms
Action Potentials, Animals, Base Sequence, Bayes Theorem, Caenorhabditis, Cloning, Molecular, Daphnia, Models, Biological, Models, Genetic, Molecular Sequence Data, Sea Anemones, Species Specificity, Xenopus, Ion Channel Gating, Sequence Analysis, DNA, Patch-Clamp Techniques, Evolution, Molecular, Computational Biology, Reverse Transcriptase Polymerase Chain Reaction, Ether-A-Go-Go Potassium Channels, Placozoa

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