The amazing case of semi-identical twins who survived while it was almost impossible

They detected the gestation of semi-identical twins for the first time during pregnancy. A unique case that surprises science.

Some twins Australians, especially a baby and a baby, have been named as the two strangest men documented in history.

This is a case so strange that it is only the second documented in the history of neonatology. Doctors in the city of Brisbane, Australia, helped a woman give birth to a pair of "semi-identical" twins.
It's a boy and a girl, who are currently 4 years old, who are identical on the mother's side.

But they only share part of their father's DNA. What puts them genetically, somewhere between fraternal twins and twins identical
Experts say that cocoa is extremely rare because such embryos often do not survive.

Professor Nicholas Fisk, who led the team that took care of the mother and twins at the Royal Brisbane Hospital in 2014, said the discovery had been made by means of a routine pregnancy test. It was the first time that semi-identical twins were identified during pregnancy.

The first mother was then 28 years old and had naturally given birth, announced the doctors. "The mother's ultrasound at six weeks showed only one placenta and the placement of amniotic sacs indicating that she was expecting identical twins," said Professor Fisk.

"However, an ultrasound at 14 weeks showed that the twins were a boy and a girl, which is not possible with identical twins." The case was published in the trade journal The New England Journal of Medicine. Until now, the identity of the children has not been revealed.

Cases of identical twins occur when a single egg, fertilized by a single sperm, divides and forms two babies.

These twins will be of the same bad and will share the same genes and physical characteristics.
Non identical or dizygotic twins occur when two separate eggs are fertilized, each with a different sperm, and then develop in the uterus at the same time.

In this case of twins semidénticos or sesquizigóticos, the researchers estimate that the egg was fertilized simultaneously by two spermatozoa before dividing. If an egg is fertilized by two spermatozoa, we obtain three sets of chromosomes instead of the two standards, one of the mother and two of the father.

And, according to the experts, three sets of chromosomes are "generally incompatible with life and embryos do not usually survive".

Non-identical twins are more common in some families. Older mothers are also more likely to have non-identical twins. Because they are more likely to release more than one egg during ovulation.
The treatment of infertility may increase the possibility of twins. Since you can place more than one embryo in the uterus.

Source: BBC WORLD

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