Voltage-dependent L-type calcium channel subunit alpha-1F

The voltage-dependent L-type calcium channel subunit alpha-1F is the pore-forming alpha-1 subunit of the Cav1.4 channel encoded by the CACNA1F gene[4][1]. It is predominantly expressed in the retina within photoreceptor synaptic terminals, where it plays a crucial role in visual signal transmission by mediating sustained calcium influx in response to membrane depolarization[4]. As part of the high voltage-activated (HVA) L-type calcium channel family, alpha-1F forms heteromultimeric complexes with auxiliary subunits (alpha-2/delta, beta, and sometimes gamma)[1][3]. The alpha-1F subunit is essential for enabling calcium-dependent processes linked to neurotransmitter release, with distinct features compared to other L-type channel isoforms (such as Cav1.2 and Cav1.3). Mutations in CACNA1F cause congenital stationary night blindness type 2A (CSNB2A) and other X-linked visual disorders[4]. L-type channels, including alpha-1F, are generally sensitive to dihydropyridine calcium antagonists, though alpha-1F selectivity is limited among current drugs[4][1]. Broader L-type channel inhibition affects muscle, endocrine, and neuronal function, contributing to safety concerns for systemic therapies.

Other names

Cav1.4CACNA1FL-type calcium channel alpha-1F subunitL-type voltage-dependent calcium channel subunit alpha-1F

Blockade of L-type calcium channels, inhibiting calcium influx and reducing downstream calcium-dependent signaling (for drugs in the L-type blocker class) Modulation of neurotransmitter/hormone release, muscle contraction, and gene expression via alteration of membrane calcium entry