Aliases for CACNA1I Gene
External Ids for CACNA1I Gene
This gene encodes the pore-forming alpha subunit of a voltage gated calcium channel. The encoded protein is a member of a subfamily of calcium channels referred to as is a low voltage-activated, T-type, calcium channel. The channel encoded by this protein is characterized by a slower activation and inactivation compared to other T-type calcium channels. This protein may be involved in calcium signaling in neurons. Alternate splicing results in multiple transcript variants. [provided by RefSeq, Oct 2011]
GeneCards Summary for CACNA1I Gene
CACNA1I (Calcium Channel, Voltage-Dependent, T Type, Alpha 1I Subunit) is a Protein Coding gene. Among its related pathways are MAPK signaling pathway and L1CAM interactions. GO annotations related to this gene include voltage-gated calcium channel activity and low voltage-gated calcium channel activity. An important paralog of this gene is CACNA1D.
UniProtKB/Swiss-Prot for CACNA1I Gene
Voltage-sensitive calcium channels (VSCC) mediate the entry of calcium ions into excitable cells and are also involved in a variety of calcium-dependent processes, including muscle contraction, hormone or neurotransmitter release, gene expression, cell motility, cell division and cell death. Isoform alpha-1I gives rise to T-type calcium currents. T-type calcium channels belong to the "low-voltage activated (LVA)" group and are strongly blocked by nickel and mibefradil. A particularity of this type of channels is an opening at quite negative potentials, and a voltage-dependent inactivation. T-type channels serve pacemaking functions in both central neurons and cardiac nodal cells and support calcium signaling in secretory cells and vascular smooth muscle. They may also be involved in the modulation of firing patterns of neurons which is important for information processing as well as in cell growth processes. Gates in voltage ranges similar to, but higher than alpha 1G or alpha 1H (By similarity).
Voltage-gated calcium channels (CaV) are present in the membrane of most excitable cells and mediate calcium influx in response to depolarisation. They regulate intracellular processes such as contraction, secretion, neurotransmission and gene expression. Voltage-gated calcium channels are formed from four or five distinct subunits; the alpha-subunit is the largest subunit and incorporates the voltage sensor, conduction pore and gating apparatus. Using pharmacological and electrophysiological techniques, at least 6 types of voltage-gated channels have been identified: L, N, P, Q, R and T, which are grouped into three families. Cav1.x are high-voltage-activated dihydropyridine-sensitive (L-type), Cav2.x are high-voltage-activated dihydropyridine-insensitive (N-, P- Q- and R-types) and Cav3.x are low-voltage-activated channels (T-type).