The most interesting development at the moment in genetic research is epigenetics. This is the study of those proteins that determine which genes get switched on, when, under what circumstances, and how often. After all, your house may contain elaborate lighting, but if nobody ever flips the wall switch, it doesn't affect you. Neither does all that hard wiring for the electric chair you're sitting in.
Epigenetics explains why two identical twins, with the exact same genome, can have different finger prints, personalities, and even allergies. Somewhere in the fetal development, or even later, different genes were activated or silenced. Scientists are hot in pursuit of how this happens.
From a philosophical point of view, epigenetics is huge. It loosens the stranglehold thinking of some biologists, that your genome is your inevitable fate. It also has tremendous fictional possibilities. Unlike your genome, which is fixed at the moment sperm penetrates egg, the expression of your genes remains fluid throughout your life. Drugs are currently being developed to try to silence those genes that contribute to the growth of tumors. If that effort succeeds, then theoretically any genes you possess could be either silenced or activated.
When I'm finished with my current project, I plan to explore this idea through science fiction. It's almost the antithesis of Huxley's BRAVE NEW WORLD. You are not locked in by your societally engineered genome -- there is a back door, an escape hatch. You can be more than the you which exists right now -- without abandoning that particular you. What could be more exciting? And unlike the actual scientists, I don't have to figure out how to do it: I merely have to state that the brilliant scientists have done so.
God, I love my job.