“Unnatural Base Pairs” Added to DNA

In 1953 James Watson and Francis Crick first stumbled on what would be known as DNA, and less than 60 years later, chemical biologist Floyd Romesberg has discovered how to add man-made base pairs to the genetic equation. This groundbreaking development opens the door for untold scientific advancements.

The unnatural but functional new base pair is the fruit of nearly a decade of research by chemical biologist Floyd Romesberg, at the Scripps Research Institute, La Jolla, California, US.
Romesberg and colleagues painstakingly created a library of nearly 200 potential new genetic bases that are slight variations on the natural ones. Unfortunately, none of them were similar enough in structure and chemistry to the real thing to be copied accurately by the polymerase enzymes that replicate DNA inside cells.
Random generation
Frustrated by the slow pace designing and synthesising potential new bases one at a time, Romesberg borrowed some tricks from drug development companies. The resulting large scale experiments generated many potential bases at random, which were then screened to see if they would be treated normally by a polymerase enzyme.
With the help of graduate student Aaron Leconte, the group synthesized and screened 3600 candidates. Two different screening approaches turned up the same pair of molecules, called dSICS and dMMO2.
The molecular pair that worked surprised Romesberg. “We got it and said, ‘Wow!’ It would have been very difficult to have designed that pair rationally.”
But the team still faced a challenge. The dSICS base paired with itself more readily than with its intended partner, so the group made minor chemical tweaks until the new compounds behaved properly.
“We probably made 15 modifications,” says Romesberg, “and 14 made it worse.” Sticking a carbon atom attached to three hydrogen atoms onto the side of dSICS, changing it to d5SICS, finally solved the problem. “We now have an unnatural base pair that’s efficiently replicated and doesn’t need an unnatural polymerase,” says Romesberg. “It’s staring to behave like a real base pair.”
The team is now eager to find out just what makes it work. “We still don’t have a detailed understanding of how replication happens,” says Romesberg. “Now that we have an unnatural base pair, we are continuing experiments to understand it better.”
In the near future, Romesberg expects the new base pairs will be used to synthesize DNA with novel and unnatural properties. These might include highly specific primers for DNA amplification; tags for materials, such as explosives, that could be detected without risk of contamination from natural DNA; and building novel DNA-based nanomaterials.

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