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. 2012 Sep 6;8(9):e1002669. doi: 10.1371/journal.pcbi.1002669

Figure 11. Mutations in the coding region of a gene.

Figure 11

This type of mutation affects how the regulators of a given target gene Inline graphic (inputs to node Inline graphic) jointly control its output. (A) Gene Inline graphic has acquired a new binding site, represented by the leftmost square in green. (B) The new binding site is occupied by one of the already existing regulators of Inline graphic. (C) The new binding site is occupied by a completely different gene (green circle) that thus becomes a new regulator of Inline graphic. (D) Another mutation in the regulatory region is the deletion of existing binding sites. Here, the deleted site belongs to a regulator for which there are alternative binding sites left which thus remains a regulator. (E) Conversely, the removal of the binding site can completely break the regulatory interaction between Inline graphic and the respective regulator. Deletion of binding sites that can leave a given gene with no regulators at all are not allowed.