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While women inherit two X chromosomes, the expressions of one of them is shut down during embryonic development. Men have one X chromosome and one Y chromosome. The switching off of women’s second X chromosome is thought to compensate for the presence of only one X in males versus two in females, to balance for X-linked gene products between the sexes. X-chromosome inactivation is also one of the clearest examples of what epigenetic mechanisms do to our genetic material: the DNA of the genes on the X is still present but not actively expressed or needed. Prof. Edith Heard was awarded ERC grants to understand the intricate processes behind the phenomenon, with unexpected results that changed the way gene regulation is now looked at.
Most of our actions can have an impact on the environment, be it minor, long-lasting or simply irreversible. But how can this effect be measured, avoided, predicted? What are the specificities of long-term risks and how can collective decisions be taken effectively to tackle those threats?