Monday, February 19, 2007

The Dangers of Synthetic Biology

Nobel Prize winner David Baltimore explains why building smallpox from scratch is a key safety concern in synthetic biology.

The emerging field of synthetic biology -- the quest to design and build new life forms that can perform useful functions -- brings exciting promise and potentially dangerous capabilities. Scientists have the ability to synthesize entire strings of DNA and put together complicated molecular machinery. But that power has raised some troubling questions. Could terrorists recreate viruses such as smallpox? Or engineer a virus even more deadly than avian flu? (see "The Knowledge").

In the 1970s, scientists faced a similar dilemma. The advent of recombinant DNA technology meant biologists could manipulate DNA as they never could before. Concerned about the potential perils of this new tool, a prominent group of scientists held the now-famous Asilomar Conference in 1975 (formally titled the "International Congress on Recombinant DNA Molecules") to determine how to proceed safely.

Thirty years later, at the Synthetic Biology 2.0 meeting at the University of California, Berkeley this month, scientists met to discuss not only new developments in the field, but also how the community should deal with the growing safety concerns surrounding synthetic biology.

David Baltimore, a winner of the 1975 Nobel Prize in physiology or medicine, and president of the California Institute of Technology, was one of the organizers of the Asilomar Conference. At the Synthetic Biology conference last week, he reflected on changes in the field over the last 30 years. Baltimore talks here with Technology Review about what scientists have learned since 1975 and the specific dangers we should be most worried about.

Technology Review: What were you were most concerned about 30 years ago?

David Baltimore: The Asilomar Conference was convened in a very different context than we have today. We were marveling at a wholly new world of experimentation -- we literally had no experience with moving DNA around. But people were also concerned, and rightly so, about issues of intrinsic safety. They were worried, for example, that we could create organisms that we didn't know how to control.

At the conference, we decided to focus purely on safety, rather than ethics or biowarfare. We believed, somewhat naively, that there was a treaty that everyone held to prohibiting use of technology to make biological weapons. In retrospect, the U.S.S.R. had a huge clandestine program. We also didn't have the situation we have today, where terrorist organizations cross boundaries and are not held by treaties. So we clearly have an unfinished agenda from Asilomar on biowarfare.

TR: What issues are you most worried about today?

DB: The real danger today is from organisms that already exist. The idea of synthesizing something worse than that, of taking bits of Ebola and other viruses to create something more deadly, underestimates how hard it is to survive in the natural world.

Adapting to the human lifestyle is very complicated, so I would guess that we would fail if we tried to engineer a dangerous organism. Ebola, for example, is very pathogenic. It infects families and health workers, but it never spreads widely because it is too lethal -- it isn't in the community long enough to spread. Bird flu is not likely to spread widely until it mutates to become less pathogenic.

Read the full interview here

No comments: