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Research Studies on Molecular Switches of Gene

y the cAMP messenger molecule. Instead, the binding of CREB to KIX is necessary for only part of the activation of certain target genes; those genes became activated even when KIX was disabled .

Further studies suggested that this KIX-independent mechanism can act on the same gene as the KIX-dependent mechanism; and that each mechanism may or may not contribute equally to activating a specific gene.

This more complex view of how CREB works may help us understand how this single transcription factor can stimulate many different genes, depending on which tissues are using it and which signaling molecule caused cAMP to put CREB to work, Brindle said. It is another clue to how CREB might activate the genes for enzymes that make glucose in the liver, while activating different genes in the brain that are key to learning and forming memories.

A long-term implication of this work is that one day it might be possible to manipulate CREBs co-factors to treat disease. A drug that blocked the specific co-factors CREB needs in the liver to trigger activity of genes that make glucose could reduce blood levels of this sugar in people with diabetes, Brindle said. But at the same time, CREB could continue its other jobs without interruption.


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