Word: expressiones
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If he had lived to see the end of the war, Wickrematunge surely would have been disappointed. I began my career as a writer at the Leader, and the seasoned editor's passion was infectious. His writing style and exposés were not for the faint-hearted. There were...
Other recent studies have also shown the power of environment over gene expression. For instance, fruit flies exposed to a drug called geldanamycin show unusual outgrowths on their eyes that can last through at least 13 generations of offspring even though no change in DNA has occurred (and generations 2...
More recently, however, researchers have begun to realize that epigenetics could also help explain certain scientific mysteries that traditional genetics never could: for instance, why one member of a pair of identical twins can develop bipolar disorder or asthma even though the other is fine. Or why autism strikes boys...
How to Make a Better Mouse As momentous as epigenetics sounds, the chemistry of at least one of its mechanisms is fairly simple. Darwin taught us that it takes many generations for a genome to evolve, but researchers have found that it takes only the addition of a methyl group...
The B vitamins acted as methyl donors: they caused methyl groups to attach more frequently to the agouti gene in utero, thereby altering its expression. And so without altering the genomic structure of mouse DNA - simply by furnishing B vitamins - Jirtle and Waterland got agouti mothers to produce healthy brown...