Voltage dependent Ca2+ channels (Cav channels) are pivotal players in many physiological roles such as secretion, contraction migration and excitation.The voltage dependent calcium channels are composed of several subunits; α1, β, α2δ and γ. Cav channels were originally divided into six physiological types: L, N , P, Q, R, and T type.The Cav2.1 (formally named α1A) makes up the α1 poreforming subunit in P/Q type Ca2+ channel family. It is expressed preferentially in the central nervous system where along with Cav2.2 is responsible for pre-synaptic Ca2+ influx and neurotransmitter release.Mutations in the Cav2.1 have been shown to cause several neurological disorders among them are familial hemiplegic migraine, episodic ataxia type 2, and spinocerebellar ataxia type 6 (SCA6).