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"Ion channels are a class of transmembrane proteins embedded in cell membranes that form hydrophilic pores allowing ions to flow across the membrane. Unlike ion pumps that consume ATP, ion channels are regulated by ""gating"" mechanisms and do not directly expend energy. Based on their gating mechanisms, ion channels are mainly classified into three major families: voltage-gated channels (responding to membrane potential changes), ligand-gated channels (responding to chemical signals such as neurotransmitters), and mechano-gated channels (responding to mechanical forces). Voltage-gated ion channels mainly include sodium channels, potassium channels, calcium channels, and chloride channels, serving as key regulators of bioelectrical signals. The human genome contains more than 400 genes encoding ion channel subunits, which are expressed in virtually all cell types and participate in nearly all physiological processes, including neurotransmission, muscle contraction, secretion, cell proliferation and differentiation, and volume regulation.

Dysfunction of ion channels is closely associated with various human diseases, a class of disorders termed ""channelopathies"". Inherited ion channel mutations can lead to epilepsy, pain, cardiac arrhythmias, stroke, migraine, and other neurological and cardiovascular disorders. It is estimated that approximately 10%-20% of small-molecule drugs in clinical use target ion channels. Ion channel modulators have been successfully developed for the treatment of hypertension, cardiac arrhythmias, anxiety disorders, epilepsy, and chronic pain. Recombinant ion channel proteins serve as indispensable tools in drug screening, target validation, and structure-function studies."