Common tests during pregnancy look for genetic abnormalities
in the developing fetus, particularly among couples undergoing fertility
treatments. In cases where a genetic abnormality is found, such as when a child
is at risk for Down syndrome, many couples decide to abort and fertility
doctors will recommend against implanting fetuses found carrying such
abnormalities. Those practices could change now that scientists have discovered
that embryos may be capable of fixing the genetic mistakes naturally.
It might sound too good to be true, but after two decades of
speculating, scientists have found evidence of embryos correcting genetic
abnormalities. A research team at the Shady Grove Center for Preimplantation
Genetics in Rockville, Maryland used embryos found to be abnormal by fertility
specialists. The embryos were donated by couples undergoing IVF at clinics.
Currently, it is common practice for fertility doctors to observe the genetic
development of an embryo for three days before implanting into the woman’s
uterus. The study authors took advantage of this practice and looked at the growing
embryos after they did not pass the three-day scrutiny. Only two days after the
embryos would’ve been discarded, a few of the embryos began to appear normal,
suggesting to scientists that the embryos actually fixed the abnormalities.
The findings are understandably controversial. Some
scientists are calling for fertility specialists to stop the three-day study of
embryos altogether, since it has not been found to increase viable pregnancy
rates. Other researchers are very skeptical of the results of the study, citing
the fact that there was no control to the experiment. Many pregnant women can
attest to the fact that their developing babies failed genetic testing, only to
come out as perfectly normal children. If the findings are correct, it could
change the way fertility clinics operate and bring an entirely new understanding
of the way embryos develop.
Have you experienced any negative genetic test results?
Embryos Right Genetic Wrongs? [
TheScientist]