Editor's Choice Main Category: Pregnancy / Obstetrics Also Included In: Genetics;Pediatrics / Children's Health Article Date: 08 Jun 2012 - 12:00 PDT
Current ratings for: 'Genetic Screening During Pregnancy Shows Promise'
1 (1 votes)
The researchers findings open up the possibility of assessing a fetus non-invasively for all single-gene disorders.
Approximately 1% of newborns are born with disorders that are caused by a defect in a single gene. These "Mendelian" disorders include cystic fibrosis, Huntington's disease, and Tay-Sachs disease.
In the future, the new non-invasive technique could help screen for these types of genetic mutations in the fetus without increasing the risk of miscarriage, said Jay Shendure and his team at the University of Washington.
Shendure explained: "This work opens up the possibility that we will be able to scan the whole genome of the fetus for more than 3,000 single-gene disorders through a single, non-invasive test."
At 18.5 weeks gestation, the researchers were able to map the whole genome of a fetus and then reconstructed it using DNA from the mother's blood plasma and saliva from the father.
Although fetal DNA is found in the mother's blood plasma, it can be challenging to distinguish which genetic signature belongs to the fetus and which belongs to the mother. As a result the team used a new technique in order to identify blocks of haplotypes (genetic variation), that could be traced back to the mother's genome.
The researchers were then able to use this information, together with data from the father's saliva sample, to determine which genomes the fetus inherited. The team then conducted a more intensive examination of the mother's DNA sample in order to identify new genetic variations that appeared only in the fetal genome.
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Genetic Screening During Pregnancy Shows Promise
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