In mouse embryos, the establishment of left-right (LR) asymmetry, which initiates the proper positioning of the internal organs, requires intracellular calcium (Cai2+) enrichment along the left side of the node. But does this mechanism also establish laterality in other vertebrates? On p. 3271, Susan Smith and colleagues report that chick embryos also use a left-side enriched Cai2+ asymmetry to establish laterality. They show that Cai2+ is enriched along the front edge of Hensen's node (the chick's organizer) by the definitive primitive streak stage. Subsequent left-side enrichment of Cai2+ requires the activity of ryanodine receptors(intracellular calcium channels) and extracellular calcium, which suggests that calcium-induced calcium release supplies the Cai2+. Furthermore, the manipulation of Cai2+ across the node randomizes heart laterality and disrupts asymmetric gene expression. Finally,other established laterality mediators regulate LR identity by directly affecting node Cai2+ concentrations, the authors report. Thus, they suggest, Cai2+ asymmetry across the node may be a conserved mechanism for establishing laterality among vertebrates,despite differences in node architecture.
Calcium asymmetry signals left from right
Calcium asymmetry signals left from right. Development 1 October 2008; 135 (19): e1902. doi:
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