A new method to increase the recovery of DNA from unborn babies in a blood sample from their mothers may be helpful for future development of non-invasive prenatal genetic tests to identify fetal abnormalities, according to an article in the March 3 issue of The Journal of the American Medical Association (JAMA).
"Prenatal diagnosis is useful in managing a pregnancy with an identified fetal abnormality and may allow for planning and coordinating care during delivery and the neonatal period," the authors provide as background information. "... invasive diagnostic tests (e.g., amniocentesis, chorionic villus sampling, percutaneous umbilical blood sampling) for fetal chromosomal abnormalities are highly reliable, but the procedure used for each test carries a risk for loss of pregnancy. Many patients who are candidates for these tests decline them because of the risk of pregnancy loss." The authors continue, "... the use of free fetal DNA for detecting chromosomal abnormalities has been limited by the seemingly low percentage of free fetal DNA in the maternal circulation."
Ravinder Dhallan, M.D., Ph.D., from Ravgen, Inc., Columbia, Md., and colleagues, analyzed blood samples from pregnant women to determine if the percentage of free fetal DNA could be increased by using formaldehyde to stabilize blood cell membranes and reduce the number of the mothers blood cells that are destroyed during sample collection, handling, and processing, which reduces the amount of maternal DNA released, thereby increasing the percentage of fetal DNA. The study was conducted in two phases from January through February 2002 at one clinical site and March 2002 through May 2003 at a network of 27 clinical sites in 16 U.S. states. The first phase collected two samples of blood from ten pregnant women - one blood sample was treated with formaldehyde and the other blood sample was untreated. In the second phase, all 69 blood samples were treated with formaldehyde.
Susan Higgins | EurekAlert!
What the world's tiniest 'monster truck' reveals
23.08.2017 | American Chemical Society
Treating arthritis with algae
23.08.2017 | Empa - Eidgenössische Materialprüfungs- und Forschungsanstalt
Whether you call it effervescent, fizzy, or sparkling, carbonated water is making a comeback as a beverage. Aside from quenching thirst, researchers at the University of Illinois at Urbana-Champaign have discovered a new use for these "bubbly" concoctions that will have major impact on the manufacturer of the world's thinnest, flattest, and one most useful materials -- graphene.
As graphene's popularity grows as an advanced "wonder" material, the speed and quality at which it can be manufactured will be paramount. With that in mind,...
Physicists at the University of Bonn have managed to create optical hollows and more complex patterns into which the light of a Bose-Einstein condensate flows. The creation of such highly low-loss structures for light is a prerequisite for complex light circuits, such as for quantum information processing for a new generation of computers. The researchers are now presenting their results in the journal Nature Photonics.
Light particles (photons) occur as tiny, indivisible portions. Many thousands of these light portions can be merged to form a single super-photon if they are...
For the first time, scientists have shown that circular RNA is linked to brain function. When a RNA molecule called Cdr1as was deleted from the genome of mice, the animals had problems filtering out unnecessary information – like patients suffering from neuropsychiatric disorders.
While hundreds of circular RNAs (circRNAs) are abundant in mammalian brains, one big question has remained unanswered: What are they actually good for? In the...
An experimental small satellite has successfully collected and delivered data on a key measurement for predicting changes in Earth's climate.
The Radiometer Assessment using Vertically Aligned Nanotubes (RAVAN) CubeSat was launched into low-Earth orbit on Nov. 11, 2016, in order to test new...
A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.
Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...
16.08.2017 | Event News
04.08.2017 | Event News
26.07.2017 | Event News
23.08.2017 | Life Sciences
23.08.2017 | Life Sciences
23.08.2017 | Physics and Astronomy