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The cost of sequencing the human genome continues to fall, reaching a low of $1,000 this year due to a new microchip and machine designed by genetics company Life Technologies Corp. And unleashed by those lower costs, a small cadre of entrepreneurs in Silicon Valley is exploring ways to harness this data to enable us to live longer and healthier lives.

Dr. Dietrich Stephan, a human geneticist, has spent the better part of a decade trying to achieve that goal. Until recently, it has been costly and time-consuming to map the 3 billion units of DNA, known as base-pairs, which make up the human genetic code. But now, he said, with the low cost of gene sequencing technologies, we are on the brink of banishing a one-size-fits-all approach to medicine.