I Am My Own Twin

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How a Man’s Unborn Twin Fathered His Child

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An unusual case illustrates how promiscuous DNA can be. It turns out we have a lot of DNA that isn’t our own Paternity tests are well known for producing some unexpected surprises, but the case involving a Washington man presents a new head-scratcher. After undergoing fertility treatments and having a son, the man and his partner were surprised when blood work showed that the boy couldn’t be related to the father. After two paternity tests showed the father only shared 10% of his child’s DNA, the parents feared the fertility clinic had inseminated the mother with another man’s sperm. The couple hired a lawyer, who wrote in to Barry Starr’s Ask a Geneticist blog. Starr, director of outreach activities at Stanford University’s Department of Genetics, suggested that the couple get a 23andMe analysis done. The consumer-based genetic testing company provides more detailed relationship and ancestry type genetic data—using hundreds of thousands of markers on the genome—than the dozen or so ma...
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My Twin Died. I Survived

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Saturday 20 July 2013 |  The Guardian The closeness of twins, two people as one, and particularly the idea of a psychic connection, has always fascinated people. But what happens to the twin who survives when the other dies? In the US they are known as “twinless twins”, in the UK as lone twins, thanks largely to the work of the Lone Twin Network . The network grew out of a research project conducted in the 1980s by Joan Woodward, who is a lone twin, into the effects on people who had lost a twin. Once the project was complete, Joan encouraged the twins who had taken part to meet and discuss their experiences. Today, the Lone Twin Network has more than 600 members and encourages connections between lone twins via annual meetings, local contacts and a Facebook page . Last month, the network dedicated a memorial bench to all lone twins at the National Memorial Arboretum, Staffordshire . It is intended to be a place for lone twins – many of whom lost a twin at birth and often ha...
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It's Possible For a Person to Have Two Different Sets of DNA - Here's How It Happens

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Human chimeras are more common than you might expect. In Greek mythology, a chimera was  a fire-breathing creature  with physical traits of a lion, goat, and dragon. In human beings, a chimera is a person who has two totally different sets of DNA inside their body. It’s a bit less dramatic than a fire-breathing monster, sure, but it’s still pretty wild. Even wilder: Human chimeras aren’t the result of futuristic genetic tinkering. They can occur naturally, and some people don’t even know that they’ve doubled up on DNA. Here’s a quick guide to the ways a person can become a human chimera. It can happen after a bone marrow transplant Bone marrow  is the tissue inside our bones that’s responsible for making white blood cells, red blood cells, and platelets. In bone marrow transplants, doctor uses chemotherapy or radiation to destroy all the recipient’s diseased bone marrow, then a donor’s healthy marrow is put in its place. The donor...
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