If there's a crime, how do we figure out the DNA fingerprint test results?
The donor may commit a crime, but the police may arrest the recipient.
When someone undergoes a bone marrow transplant, they receive new bone marrow stem cells from a donor. These stem cells then migrate to the bone marrow and begin producing new blood cells. While the blood cells themselves carry the genetic information of the donor, the DNA in other tissues and cells of the recipient's body, such as skin, hair, saliva, and other bodily fluids, remains unchanged and retains the recipient's original genetic profile.DNA fingerprint tests, also known as DNA profiling or DNA typing, analyze specific regions of an individual's DNA to create a unique genetic profile. These tests can be performed on various bodily samples, including blood, saliva, hair, and skin cells. Even after a bone marrow transplant, the recipient's original DNA can still be found in these samples, allowing for identification through DNA fingerprinting.This ability to use DNA from various sources for identification is crucial in forensic science, paternity testing, and medical diagnostics, as it provides a reliable method for determining an individual's identity or establishing biological relationships.
In practice you will most often be using STR locuses in DNA profiling and skilled experts will be able to determine if there is a match in enough of the locuses to prove same origin of the trace and the sample of the suspect.
Additionally Mitochondrial DNA that brothers and sisters share can always be used if the siblings are ruled out by other methods.
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