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Chemotaxis is cell movement in the direction of a chemical and is composed of two component: movement and directionality. The directionality of eukaryotic chemotaxis is probably derived from orientation: the detection of the spacial gradient of chemoattractant over the cell length. Chemotaxis was investigated in eukaryotic Dictyostelium discoideum cells that were permeabilized by high-voltage discharges. These permeable cells respond chemotactically to extracellular cAMP. However, locomotion is impaired if the Ca2+ concentration is clamped at submicromolar concentrations; interestingly, these non-motile cells still form pseudopodia and elongate in the direction of the cAMP gradient. These results imply that locomotion and orientation during Dictyostelium chemotaxis are independently regulated.

Independent control of locomotion and orientation during Dictyostelium discoideum chemotaxis