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fig2

fig2

Mechanical compression induces Twist expression in Drosophila embryos.
(A) In stage 6 Drosophila embryos, stomodeal cells (red arrows) are not compressed; they are compressed at stage 7 by the anterior convergence-extension movement of ventral and, possibly, dorsal tissues (yellow arrows). (B) Twist is expressed weakly in the stomodeal cells early in stage 6 (red arrows); 10 mins after compression begins in stage 7, Twist starts to be expressed strongly. (C) Mutants in the genes bcd, nos and tsl, which do not undergo convergence-extension and so do not compress stomodeal cells, do not induce strong expression of Twist in these cells. (D) Strong expression of Twist in the stomodeal cells of mutant embryos is induced by mechanical compression of the cells by applying a 50µm point.