What happens is that the surviving embryo can absorb some of the cells of their deceased twin.ĭuring DNA testing, a human chimera can be surprised to find out that they have different DNA profiles from their DNA samples. When a mother carries fraternal twins, one of the twins can die very early during the pregnancy. This is probably the most interesting type of chimerism there is as it involves an embryo absorbing its twin in utero. Fusion chimerismįinally, there’s also the condition called fusion chimerism. They found traces of male DNA in 63% of the women, proving the aforementioned theory.Įxperts believe that the phenomenon is very common, if not universal, among pregnant women. To test the theory on whether microchimerism can persist longer, researchers studied mothers who have sons but did not necessarily just give birth to one, the oldest of which was 94 years old. Mothers who have just given birth to boys have been tested and all possessed cells with Y chromosomes, which are only present in males. This phenomenon is called “microchimerism.” Normal pregnancyĪ lot of wonderful (and sometimes weird) things happen to the body during pregnancy, but did you know that pregnancy can also result in chimerism? Scientists found that a pregnant woman may retain some of her baby’s DNA if these cells migrate outside the uterus. In some cases, 100% of the recipient’s blood cells contain the donor’s DNA, causing “complete chimerism.” In other cases, the recipient’s blood cells can contain a mix of DNA both from themselves and their donor. Through this process, the recipient of the marrow becomes a chimera. When a person undergoes a bone marrow transplant and a healthy marrow is placed inside his body, the donated bone marrow will keep producing blood cells that contain the donor’s DNA. The bone marrow is responsible for producing white blood cells, red blood cells, and platelets. Bone marrow transplantĪ medical operation, namely a bone marrow transplant, can cause you to become a chimera. Here are 3 ways a person can become a chimera. In fact, some people - even you - may not know they possess twin sets of DNA. How is it possible? While the condition can be rare and experts are not exactly certain how many human chimeras exist in the world, the condition can occur naturally. A chimera is a person who has two different sets of DNA inside their body.
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