It seems clear that technical advances in assisted reproduction bring us favorable data about its effectiveness. But still a very high number of multiple pregnancies continues to occur, since of the embryos obtained after in vitro fertilization, several are usually selected for implantation in the mother's womb, so that at least one develops until the end.
But in many cases, if the parents had been able to choose, they would only want a baby, and even the doctors who will continue the pregnancy in many cases could see risk factors in multiple pregnancies, since it could put both the mother's health at risk Like babies.
That is why progress is being made in improving the results of "in vitro" reproduction techniques, through techniques that allow implanting a single embryo with guarantees that it will develop. The DNA analysis of embryos produced in the laboratory will allow a safer single implant.
To try to have objective and reliable criteria for selecting embryos, they are turning to analyze their DNA before implantation and that of healthy children born from these embryos. Thus it is known which of these embryos have come to term and genetic characteristics that are favorable for their implantation are studied.
Australian and Greek researchers They have developed a new strategy that combines the study of embryo cells before implantation (blast), genetic footprint and genetic analysis to identify viable blastocysts among those implanted in patients. The ultimate goal is to determine which genes express these viable embryos.
In the future, ideally, it would be enough to select an embryo with a high degree of certainty that it would develop so that fertilization would be successful.
