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Calcium voltage-gated channel auxiliary subunit gamma-7 (CACNG7)

Target: CACNG7
Molecular classification: Ion channel auxiliary subunit, AMPA receptor regulatory protein (TARP, type II), PMP-22/EMP/MP20 protein family member

Overview

Calcium voltage-gated channel auxiliary subunit gamma-7 (CACNG7) is a protein coding gene and member of the PMP-22/EMP/MP20 family, functioning as an ion channel auxiliary subunit and a type II transmembrane AMPA receptor regulatory protein (TARP). CACNG7 is critical for the trafficking and gating of AMPA receptors, influencing their localization to the cell membrane and synapses and modifying their channel kinetics (activation, deactivation, desensitization, and resensitization), with specificity for certain AMPAR subunits (GRIA1, GRIA2). It also helps regulate L-type voltage-gated calcium channel activity, especially channels containing CACNA1C. CACNG7 is expressed predominantly in neuronal tissues and has been associated with disorders such as Spinocerebellar Ataxia 23 and pituitary hormone deficiencies, underlying its importance in neurological health and potential as a therapeutic target.

Other names: Voltage-dependent calcium channel gamma-7 subunitNeuronal voltage-gated calcium channel gamma-7 subunitCalcium channel, voltage-dependent, gamma subunit 7Transmembrane AMPAR regulatory protein gamma-7TARP gamma-7CCG7_HUMAN

Mechanism of action

Drugs targeting AMPARs or L-type calcium channels may indirectly act on pathways regulated by CACNG7 (mechanisms include channel antagonism or modulation)

Biological functions

Regulates trafficking and gating properties of AMPA-selective glutamate receptors (AMPARs)Promotes targeting of AMPARs to cell membranes and synapsesModulates AMPAR gating kinetics: slows activation, deactivation, desensitization, and promotes resensitization (particularly for specific AMPAR subunits GRIA1 and GRIA2)Regulates activity of L-type voltage-gated calcium channels containing CACNA1C as pore-forming subunitInvolved in positive regulation of dendrite extension

Disease associations

Spinocerebellar Ataxia 23Isolated growth hormone deficiency, type IbPotential roles in neurodegenerative disease, channelopathies, and neurological functions inferred from AMPAR and calcium channel regulation

Safety considerations

Potential for altered synaptic transmission and excitability in the central nervous system if CACNG7 is modulated, as it affects AMPAR and calcium channel functionGeneric challenges in targeting auxiliary channel subunits, as off-target effects on neuronal excitability may occur

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