Artificial Life Likely in 3 to 10 Years
Aug 20, 2007 1:49 AM (ET)
By SETH BORENSTEIN
Associated Press
http://apnews.myway.com//article/20070820/D8R4INM00.html
WASHINGTON (AP) - Around the world, a handful of scientists are trying to
create life from scratch and they're getting closer.
Experts expect an announcement within three to 10 years from someone in the
now little-known field of "wet artificial life."
"It's going to be a big deal and everybody's going to know about it," said
Mark Bedau, chief operating officer of ProtoLife of Venice, Italy, one of
those in the race. "We're talking about a technology that could change our
world in pretty fundamental ways - in fact, in ways that are impossible to
predict."
That first cell of synthetic life - made from the basic chemicals in DNA -
may not seem like much to non-scientists. For one thing, you'll have to
look in a microscope to see it.
"Creating protocells has the potential to shed new light on our place in
the universe," Bedau said. "This will remove one of the few fundamental
mysteries about creation in the universe and our role."
And several scientists believe man-made life forms will one day offer the
potential for solving a variety of problems, from fighting diseases to
locking up greenhouse gases to eating toxic waste.
Bedau figures there are three major hurdles to creating synthetic life:
- A container, or membrane, for the cell to keep bad molecules out, allow
good ones, and the ability to multiply.
- A genetic system that controls the functions of the cell, enabling it to
reproduce and mutate in response to environmental changes.
- A metabolism that extracts raw materials from the environment as food and
then changes it into energy.
One of the leaders in the field, Jack Szostak at Harvard Medical School,
predicts that within the next six months, scientists will report evidence
that the first step - creating a cell membrane - is "not a big problem."
Scientists are using fatty acids in that effort.
Szostak is also optimistic about the next step - getting nucleotides, the
building blocks of DNA, to form a working genetic system.
His idea is that once the container is made, if scientists add nucleotides
in the right proportions, then Darwinian evolution could simply take over.
"We aren't smart enough to design things, we just let evolution do the hard
work and then we figure out what happened," Szostak said.
In Gainesville, Fla., Steve Benner, a biological chemist at the Foundation
for Applied Molecular Evolution is attacking that problem by going outside
of natural genetics. Normal DNA consists of four bases - adenine, cytosine,
guanine and thymine (known as A,C,G,T) - molecules that spell out the
genetic code in pairs. Benner is trying to add eight new bases to the
genetic alphabet.
Bedau said there are legitimate worries about creating life that could "run
amok," but there are ways of addressing it, and it will be a very long time
before that is a problem.
"When these things are created, they're going to be so weak, it'll be a
huge achievement if you can keep them alive for an hour in the lab," he
said. "But them getting out and taking over, never in our imagination could
this happen."
================================
George Antunes, Political Science Dept
University of Houston; Houston, TX 77204
Voice: 713-743-3923 Fax: 713-743-3927
antunes at uh dot edu