Word: dna
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Dates: during 1990-1999
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Scott's rivals at Genset, based in France, are taking a similar approach: their map, to be completed in early 2000, will highlight just 60,000 of some 10 million biochemical "beacons" found along the human genome. By comparing the DNA of many individuals in and around these signposts, Genset hopes to pick out specific genes whose malfunctions actually cause disease. It has already begun to work. Using this technique, says Genset chief genomics officer Dr. Daniel Cohen, the company has found two different genes involved in prostate cancer. Cohen points out that the 20 most common diseases, which kill...
That was fine with Venter, since the strips of DNA that are actually being used as blueprints for constructing a protein are where the action is. So Venter decided to concentrate on these active parts. He focused on the so-called messenger RNA, or mRNA, which ferries instructions from DNA over to the cell's protein-making machinery. This is the essence of the gene, and it was these stripped-down genetic instructions--copied into a more stable form known as cDNA--that he fed into an automated gene sequencer he'd acquired...
Officials at the National Institutes of Health were delighted that one of their own had struck the mother lode, and they rushed to patent Venter's genes. But across the NIH campus, James Watson, who had won a Nobel for his co-discovery of the structure of DNA and who was then running NIH's Human Genome Project, was outraged. This wasn't science, he insisted. "Virtually any monkey" could do that work, Watson fumed in the opening salvo of a battle that would rage for months--and which smolders to this day. To patent such abbreviated genetic material, said...
...Johns Hopkins Nobelist Hamilton Smith challenged Venter to do more. At the time, Venter was using a technique called shotgunning. In essence, shotgunning amounts to putting DNA into a chemical Cuisinart. High-frequency sound waves shred the long stringy molecule into tiny fragments. The fragments are cloned in bacteria, and then, following what has become standard gene-mapping procedure, the bugs are ripped open and their DNA is run through a gene-sequencing machine...
...because the original DNA has been torn into so many random bits of genetic gibberish (as opposed to the predictable fragments made by gene-cutting enzymes), scientists need powerful computers to determine where the tiny fragments overlap. This is tough enough when you're sequencing a small part of a chromosome. But now Smith urged Venter to try it out, not merely on a strip of DNA but on an entire genome. He proposed Haemophilus influenzae, a bacterium that causes ear infections and meningitis. Until then, only a few small viruses, whose genomes had tens of thousands of genetic letters...