They were mystery diseases that had stumped doctors for years - adults with strange symptoms and children with neurological problems, mental slowness or muscles too weak to let them stand. Now scientists say they were able to crack a quarter of these cases by decoding the patients' genes.

Their study is the first large-scale effort to move gene sequencing out of the lab and into ordinary medical care, and it shows that high hopes for this technology are finally paying off.

"This is a direct benefit of the Human Genome Project," the big effort to decode our DNA, said Dr. Christine M. Eng of Baylor College of Medicine in Houston. "We're now able to directly benefit patients through more accurate diagnosis."

She led the study, which was published online Wednesday by the New England Journal of Medicine. It gives results on the first 250 patients referred to Baylor for a newer type of sequencing - just the DNA segments that hold the recipes for all the proteins the body needs. That's only about 1 percent of the whole genome.

Baylor has sequenced more patients beyond those in the study - 1,700 so far - and found gene flaws in 1 out of 4, Eng said.

That rate will improve as more genes are linked to diseases, but it's already much higher than the less comprehensive gene tests done now, said Rebecca Nagy, a scientist at Ohio State University and president of the National Society of Genetic Counselors.

"For some of these conditions there could be treatments that are lifesaving," she said.

Already, three people tested at Baylor were found to have a muscle disorder that can cause respiratory problems and even death. The condition is aggravated by infections and stress, and there are drugs to treat those and prevent serious episodes, Eng said.

In other cases, having a diagnosis helped parents like Lindsey and Brandon Collier decide whether to have more children. The Colliers, who live in Georgetown, Texas, about 30 miles north of Austin, searched for years for an answer to what was plaguing their son, Cannon, now 4.

"He was a pretty floppy baby" with poor muscle tone and problems eating, Lindsey Collier said. "We weren't getting any answers and they were just all over the map on everything they were testing for."

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Gene scans help solve mystery diseases in kids, adults

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