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A Harvard University scientist backed by Google Inc. and OrbiMed Advisors LLC plans to unlock the secrets of common diseases by decoding the DNA of 100,000 people in the world's biggest gene sequencing project.

Harvard's George Church plans to spend $1 billion to tie DNA information to each person's health history, creating a database for finding new medicines. The U.S., U.K., China and Sweden this year began working together to decipher the genetic makeup of 1,000 people at a cost of $50 million.

Google, owner of the most popular Internet search engine, is looking for ways to give people greater control over their medical data. Along with the unspecified donation to Church, the Mountain View, California-based company said last week that it would work with the Cleveland Clinic to better organize health records, and last year gave $3.9 million to 23andme Inc., a seller of genomic data to individuals.

Church's plan ``would be the largest human genome sequencing project in the world,'' Stephen Elledge, a geneticist at Harvard Medical School in Boston, said in a telephone interview today. ``The genetic...