We learned that wearing ‘boyfriend genes’ is not just a fashion trend, but that some women have male DNA in their brain. 

According to a study published on PLOS ONE, male DNA is commonly found in the brains of women.

Scientists examined brain autopsy specimens from 59 women who had died between the ages of 32 and 101.   Twenty-six of the women had no neurological disorder and 33 had Alzheimer’s disease.  Scientists found evidence of male microchimerism in the brains of 63 percent of the women.

Scientists believe this most likely happens after women have given birth to a male child.  The findings support the hypothesis that fetal cells frequently cross the human blood-brain barrier.  So, when a woman carries a child, some of that child’s DNA may stay in her body.