PMID: 9421811Jan 9, 1998Paper

Two molecular models of initial left-right asymmetry generation

Medical Hypotheses
M Levin, N Nascone

Abstract

Left-right (LR) asymmetry is a fascinating problem in embryonic morphogenesis. Recently, a pathway of genes has been identified which is involved in LR patterning in vertebrates. Although this work characterizes the interactions of several asymmetrically-expressed genes, it is still entirely unclear how such asymmetric expression is set up in the first place. There are two promising molecular candidates which may play a role is such a process: the motor protein dynein, and the gap junction protein connexin-43 (Cx43). We present two models, significantly supported by previous findings, which hypothesize that (a) dynein asymmetrically localizes LR determinants in individual cells to establish cell-autonomous LR biasing, and (b) asymmetric activity of Cx43 gap junctions within key cells sets up electric potentials in multicellular fields, thus establishing large-scale LR asymmetry.

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