Abstract
Two new potassium channel genes, erg2 and erg3, that are expressed in the nervous system of the rat were identified. These two genes form a small gene family with the previously described erg1 (HERG) gene. The erg2 and erg3 genes are expressed exclusively in the nervous system, in marked contrast to erg1, which is expressed in both neural and non-neural tissues. All three genes are expressed in peripheral sympathetic ganglia. The erg3 channel produces a current that has a large transient component at positive potentials, whereas the other two channels are slowly activating delayed rectifiers. Expression of the erg1 gene in the sympathetic nervous system has potential implications for the etiology of the LQT2 form of the human genetic disease long QT syndrome.
Publication types
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Animals
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Cation Transport Proteins*
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Cloning, Molecular
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DNA, Complementary / isolation & purification
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DNA-Binding Proteins*
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ERG1 Potassium Channel
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Electrophysiology
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Ether-A-Go-Go Potassium Channels
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Gene Expression / physiology
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Heart / innervation
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Humans
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Kinetics
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Long QT Syndrome / genetics
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Membrane Transport Proteins*
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Molecular Sequence Data
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Neurons / chemistry*
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Neurons / physiology
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Oocytes / physiology
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Potassium Channels / genetics*
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Potassium Channels / metabolism
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Potassium Channels, Voltage-Gated*
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RNA, Messenger / analysis
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Rats
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Sequence Homology, Amino Acid
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Sympathetic Nervous System / chemistry
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Sympathetic Nervous System / cytology
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Trans-Activators*
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Transcriptional Regulator ERG
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Xenopus
Substances
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Cation Transport Proteins
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DNA, Complementary
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DNA-Binding Proteins
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ERG protein, human
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ERG1 Potassium Channel
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Ether-A-Go-Go Potassium Channels
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KCNH2 protein, human
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KCNH6 protein, human
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KCNH7 protein, human
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Kcnh6 protein, rat
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Kcnh7 protein, rat
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Membrane Transport Proteins
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Potassium Channels
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Potassium Channels, Voltage-Gated
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RNA, Messenger
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Trans-Activators
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Transcriptional Regulator ERG