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A biophysical model has been proposed which deals with the observed collinearity of Hox gene expressions in developing vertebrate limbs. It is assumed that physical forces gradually dislocate the genes of the Hoxd cluster from inside the chromosome territory into the interchromosome domain, where the genes are activated. In particular, the action of Coulomb electric forces has been estimated in detail. Genetic engineering experiments (deletions, duplications and transpositions) were recently reported for Hoxd expression during limb development. Here, we analyse these results and show that the biophysical model explains them successfully.

A biophysical mechanism may control the collinearity of Hoxd genes during the early phase of limb development