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Sequencing works in clinical setting to help -- finally -- get a diagnosis
Date:5/7/2012

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"Just knowing what was causing the problem took away the mystery, which gives families some comfort," Shashi said.

Goldstein said that simply studying more patients with sequencing tools would facilitate discovery by searching for similarities among patients that have mutations in the same or similar genes.

With time, this would also reveal more diagnoses, said lead author Anna Need, Ph.D., who works in the Duke Center for Human Genome Variation.

"Despite the fact that we ended up with a short list of gene variants for each person we studied and ran other tests, we had no real evidence of a related disease because there haven't been other reported conditions or people with mutations in those genes," Need said. "Some of the people we had no results for yet may get answers as their variants become associated with diseases through other sequencing."

The results of this study also are important for genetic counseling, Goldstein said.

For example, some of the likely diagnoses are due to new mutations that happened in the children, known as de novo mutations. In these cases, the parents would be less likely to pass it on through a subsequent pregnancy, for example.

Another lesson of the study was that some of these individuals may have multiple genetic conditions. Shashi noted one child received a diagnosis for only one of several conditions she had.

"We may not find all of the genetic causes, but over time the success of this type of testing and the information we learn will only grow," Need said. "Out of the genes we found, two have been found to be associated with disease through recent studies by other researchers."

Goldstein said it is imperative to set up large genetic databases in tertiary medical centers, which have the doctors and scientists who can evaluate patients who might benefit from next-generation sequencing. They would also have the team to do the genomic sequencing,
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Contact: Mary Jane Gore
mary.gore@duke.edu
919-660-1309
Duke University Medical Center
Source:Eurekalert

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