Alpha actinins belong to the spectrin gene superfamily which represents a diverse group of cytoskeletal proteins , including the alpha and beta spectrins and dystrophins. Alpha actinin is an actin-binding protein with multiple roles in different cell types. In nonmuscle cells , the cytoskeletal isoform is found along microfilament bundles and adherens-type junctions , where it is involved in binding actin to the membrane. In contrast , skeletal , cardiac , and smooth muscle isoforms are localized to the Z-disc and analogous dense bodies , where they help anchor the myofibrillar actin filaments. This gene encodes a nonmuscle , cytoskeletal , alpha actinin isoform and maps to the same site as the structurally similar erythroid beta spectrin gene. Three transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq , Jul 2008] ,
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