New Fetal Genetics Test: Less Risk, More Controversy | WAMU 88.5 - American University Radio

NPR : News

Filed Under:

New Fetal Genetics Test: Less Risk, More Controversy

The full genetic code of a fetus has been cracked. The technique, used by scientists at the University of Washington, could offer parents safer and more comprehensive prenatal testing in the future. It also leaps into a debate over what information parents will eventually have — and use — to decide whether to have an abortion.

The ethical questions that arise from this kind of testing abound: Discovering certain genetic diseases could lead some parents to terminate the pregnancy. Plus, NPR's Rob Stein says, the full-genome tests could lead parents to seek out positive traits, too: eye color, height, athleticism, intelligence.

"That's the theoretical possibility — that someday down the road, this can open up a real Pandora 's box of all kinds of moral and ethical problems," he tells All Things Considered host Audie Cornish.

Key to conducting the study, published in the journal Science Translational Medicine, is the fact the fetus' DNA runs through its mother's blood. Stein says this recent realization has allowed scientists to figure out new ways of extracting and analyzing that DNA. For this test, they also took a sample from the father's saliva, to determine which DNA belonged to the fetus.

Getting a sample from the mother's blood is less risky than the current prenatal tests available: amniocentesis and chorionic villus sampling.

"Those tests are what they call 'invasive,' which means they can be risky. They can cause miscarriages in women," Stein says.

He points out that in the last year or two, there have been other tests that use DNA in the blood, rather than in the uterus.

"But those tests are much more specific. ... They don't spell out every single letter in the genetic code," he says. "They look for very specific variations — usually things like Down syndrome and conditions related to that."

While a possible future filled with "designer" babies looms, Stein says that reality is still far away.

"The whole-genome sequencing for prenatal testing is something that's way, way, way off in the future," he says. "There's no way that's going to happen any time soon."

Experts tell The New York Times the process isn't "practical, affordable or accurate enough for use now."

The University of Washington researchers point out that though they can collect more data than ever, it doesn't mean they always know what to do with it.

"A full fetal genome sequence would turn up numerous mutations for which information is lacking as to whether they cause disease, posing a dilemma for expectant parents and their doctors," the Times says.

According to the report:

"[As] in other areas of clinical genetics, our capacity to generate data is outstripping our ability to interpret it in ways that are useful to physicians
and patients."

Meanwhile, debates related to fetal testing are playing out in the courts. As NPR's Kathy Lohr reported in May, several states are looking at so-called "wrongful birth" laws. This kind of legislation would prevent parents from suing a doctor who doesn't warn them about fetal problems.

Copyright 2012 National Public Radio. To see more, visit http://www.npr.org/.

NPR

In An Earthquake, History Fuels One Writer's Anxiety

An earthquake in Napa Valley this week brought back old fears for author Gustavo Arellano. In his anxiety he's revisiting the book A Crack in the Edge of the World.
NPR

Real Vanilla Isn't Plain. It Depends On (Dare We Say It) Terroir

There's no such thing as plain vanilla — at least if you're talking about beans from the vanilla orchid. Whether it's from Tahiti or Madagascar, vanilla can be creamy, spicy or even floral.
NPR

Federal Judge Blocks Texas Restriction On Abortion Clinics

Requiring every center that performs abortions to meet all the standards of a surgical center is excessively restrictive, says the federal district court judge who blocked the state rule Friday.
NPR

Tech Week: Uber's Tricks, JPMorgan Hacked & A Desk Microwave

Also in this week's roundup, Amazon's $1 billion purchase surprises some tech watchers. But we're most excited about finding a way to avoid physical exertion at lunch.

Leave a Comment

Help keep the conversation civil. Please refer to our Terms of Use and Code of Conduct before posting your comments.