The function of CACNA1C (calcium voltage-gated channel subunit alpha1 C, Ensembl gene identifier ENSG00000151067) is as follows. Pore-forming, alpha-1C subunit of the voltage-gated calcium channel that gives rise to L-type calcium currents (PubMed:12181424, PubMed:15454078, PubMed:15863612, PubMed:16299511, PubMed:17224476, PubMed:20953164, PubMed:23677916, PubMed:24728418, PubMed:26253506, PubMed:27218670, PubMed:29078335, PubMed:29742403, PubMed:30023270, PubMed:30172029, PubMed:34163037, PubMed:8099908). Mediates influx of calcium ions into the cytoplasm, and thereby triggers calcium release from the sarcoplasm (By similarity). Plays an important role in excitation-contraction coupling in the heart. Required for normal heart development and normal regulation of heart rhythm (PubMed:15454078, PubMed:15863612, PubMed:17224476, PubMed:24728418, PubMed:26253506). Required for normal contraction of smooth muscle cells in blood vessels and in the intestine. Essential for normal blood pressure regulation via its role in the contraction of arterial smooth muscle cells (PubMed:28119464). Long-lasting (L-type) calcium channels belong to the 'high-voltage activated' (HVA) group (Probable). {ECO:0000250|UniProtKB:P15381, ECO:0000269|PubMed:12181424, ECO:0000269|PubMed:15454078, ECO:0000269|PubMed:15863612, ECO:0000269|PubMed:16299511, ECO:0000269|PubMed:17224476, ECO:0000269|PubMed:20953164, ECO:0000269|PubMed:23677916, ECO:0000269|PubMed:24728418, ECO:0000269|PubMed:25260352, ECO:0000269|PubMed:25633834, ECO:0000269|PubMed:26253506, ECO:0000269|PubMed:27218670, ECO:0000269|PubMed:28119464, ECO:0000269|PubMed:29078335, ECO:0000269|PubMed:29742403, ECO:0000269|PubMed:30023270, ECO:0000269|PubMed:30172029, ECO:0000269|PubMed:31430211, ECO:0000269|PubMed:34163037, ECO:0000269|PubMed:8099908, ECO:0000305}. [Isoform 12]: Pore-forming, alpha-1C subunit of the voltage- gated calcium channel that gives rise to L-type calcium currents. . [Isoform 13]: Pore-forming, alpha-1C subunit of the voltage- gated calcium channel that gives rise to L-type calcium currents. . [Isoform 14]: Pore-forming, alpha-1C subunit of the voltage- gated calcium channel that gives rise to L-type calcium currents. . [Isoform 15]: Pore-forming, alpha-1C subunit of the voltage- gated calcium channel that gives rise to L-type calcium currents. . [Isoform 16]: Pore-forming, alpha-1C subunit of the voltage- gated calcium channel that gives rise to L-type calcium currents. . [Isoform 17]: Pore-forming, alpha-1C subunit of the voltage- gated calcium channel that gives rise to L-type calcium currents. . [Isoform 18]: Pore-forming, alpha-1C subunit of the voltage- gated calcium channel that gives rise to L-type calcium currents. . [Isoform 19]: Pore-forming, alpha-1C subunit of the voltage- gated calcium channel that gives rise to L-type calcium currents. . [Isoform 20]: Pore-forming, alpha-1C subunit of the voltage- gated calcium channel that gives rise to L-type calcium currents. . [Isoform 21]: Pore-forming, alpha-1C subunit of the voltage- gated calcium channel that gives rise to L-type calcium currents. . [Isoform 22]: Pore-forming, alpha-1C subunit of the voltage- gated calcium channel that gives rise to L-type calcium currents. . [Isoform 23]: Pore-forming, alpha-1C subunit of the voltage- gated calcium channel that gives rise to L-type calcium currents. . [Isoform 24]: Pore-forming, alpha-1C subunit of the voltage- gated calcium channel that gives rise to L-type calcium currents. . [Isoform 25]: Pore-forming, alpha-1C subunit of the voltage- gated calcium channel that gives rise to L-type calcium currents. . [Isoform 26]: Pore-forming, alpha-1C subunit of the voltage- gated calcium channel that gives rise to L-type calcium currents. . [Isoform 27]: Pore-forming, alpha-1C subunit of the voltage- gated calcium channel that gives rise to L-type calcium currents. . [Isoform 34]: Pore-forming, alpha-1C subunit of the voltage- gated calcium channel that gives rise to L-type calcium currents. . (Microbial infection) Acts as a receptor for Influenzavirus (PubMed:29779930). May play a critical role in allowing virus entry when sialylated and expressed on lung tissues (PubMed:29779930). .