Mice Inherit Specific Memories
1st December 2013
If you’ve followed science news over the past decade then you’ve probably heard about epigenetics, a field that’s caught fire in the minds of scientists and the public, and understandably so. Epigenetic studies have shown that changes in an organism’s external environment — its life experiences and even its choices, if you want to get hyperbolic — can influence the expression of its otherwise inflexible DNA code. Epigenetics, in other words, is enticing because it offers a resolution to the tedious, perennial debates of nurture versus nature.
But some scientists dispute the notion that epigenetic changes have much influence on behavior (see this Nature feature for a great overview of the debate). Even more controversial is the idea that epigenetic changes can be passed down from one generation to the next, effectively giving parents a way to prime their children for a specific environment. The key question isn’t whether this so-called ‘transgenerational epigenetic inheritance’ happens — it does — but rather how it happens (and how frequently, and in what contexts and species).