Three healthy babies have been born in a pilot study of a technique to screen eggs across the full range of chromosomes, looking for defects that boost the risk of miscarriage, doctors said on Friday.
Twin girls were born in Germany in June, while a boy was born in Italy last month, the European Society of Human Reproduction and Embryology (ESHRE) said.
“All babies and their mothers are doing very well in terms of weight and overall developmental performance,” said Cristina Magli, an embryologist at the SISMER Centre in Bologna, which took part in the trial.
It is the first controlled trial of a technique called microarray comparative genomic hybridization (CGH), which aims at boosting -success in assisted reproduction.
The first birth using CGH occurred in Britain last year when a baby, was born to a 41-year-old woman who had had 13 failed attempts at in-vitro fertilization (IVF).
Several other pregnancies in ESHRE’s study are still under way, and plans are being set for a large-scale international clinical trial next year, the society said in its press release.
Human cells have 46 chromosomes, with 23 inherited from each parent. Before an egg is fertilized, it ejects half of its full set of chromosomes to make room for the 23 coming from the sperm. These discarded chromosomes, held in a structure called the “polar body,” are a mirror image of those remaining in the egg.
CGH examines this cast-off -genetic material. If there are too few or too many chromosomes, doctors know that the egg is not suitable for use.
ESHRE said CGH screening had several advantages.
Firstly, it tests all 23 pairs of chromosomes in a cell, rather than a limited number, as other methods do, ESHRE said.
In addition, the cell tested is taken from the egg at fertilization, rather than from a developing embryo.
As a result, the technique could be a boon in countries which outlaw embryo analysis.
Further, by selecting an embryo that has the best chance of developing into a live birth, IVF doctors are less tempted to implant multiple embryos, one of the most controversial areas of IVF, given the evidence that twins and triplets are at risk of low birth weight and developmental difficulties.
Women who would benefit most from CGH are in a category where there is higher-than-average rate of embryonic chromosomal abnormalities, ESHRE said.
These are women who are aged over 37 and have a record of unsuccessful IVF and a history of miscarriage.
“We have learnt from more than 30 years of IVF that many of the embryos we transfer have chromosome abnormalities,” ESHRE chairman Luca Gianaroli said.
“Indeed, it’s still the case that two out of every three embryos we transfer fail to implant as a pregnancy, many of them because of these abnormalities.”
The exploit reflects the -widening use of DNA screening in IVF, although the principle has also hit ethical concerns that it could be abused to create “designer” babies.
Nearly four million children around the world have been born through IVF or a related technique, involving the transfer of a single sperm into the egg, since the first “test-tube” baby, Louise Brown, was born in 1978.
The scientist who pioneered the technique, Bob Edwards, was awarded the Nobel Medicine Prize on Oct. 4.
The Vatican lashed the award as “completely out of order,” given the large numbers of embryos that are wasted. The Roman Catholic church and some evangelical conservatives contend that human life starts at the earliest state of the embryo.
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