During somitogenesis, an oscillating gene network generates a segmental pattern in the presomitic mesoderm. In zebrafish, this segmentation clock centres on cycles of transcription and self-repression of numerous hairy-enhancer of split related (her) genes, which encode proteins that dimerise, bind DNA and repress transcription. On p. 940, Scott Holley and co-workers systematically examine the physical interactions between Her proteins and test the ability of various Her protein dimers to bind to cis regulatory sequences. Dimerisation of Her proteins is specific, they report, with Hes6 serving as the hub of the network. Not all dimers bind to DNA, they note, but those that do so have distinct preferences for different cis regulatory sequences. Finally, Her7 disproportionately influences the availability of Hes6 for heterodimerisation with other Her proteins. The researchers propose, therefore, that Her7 has two functions within the zebrafish segmentation clock – direct repression of transcription through formation of a DNA-binding heterodimer with Hes6 and modulation of the network topology via sequestration of the network hub.
- © 2012.
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