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'Human chimera': Man fails paternity test because genes in his saliva are different to those in sperm

It is thought cells from a miscarried sibling were absorbed by the man while he was in the womb

The couple feared there had been a mix up at the fertility clinic Getty Images

A US man has failed a paternity test after doctors revealed his dead twin, whose DNA the man absorbed in the womb, is the genetic father of the child. 

The 34-year-old man is the first ever reported case of a paternity test being fooled by a human chimera, someone with extra genes absorbed from a twin lost in early pregnancy.

Approximately one in eight single childbirths are thought to start as multiple pregnancies and occasionally cells from the miscarried siblings are sometimes absorbed in the womb by a surviving twin.

According to Buzzfeed, the Washington couple took a paternity test after their son’s blood type didn’t match that of either parent. After having a child with the help of fertility clinic procedures, they feared that sperm donors may have potentially been mixed up.

 

 

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