Graft-Versus-Host Disease

Chimerism is a rare but astonishing biological event where two distinct genetic cell lines coexist in one body. In the case of bone marrow transplants, donor cells can entirely replace the recipient’s blood DNA, even affecting forensic investigations. Imagine leaving behind DNA at a crime scene—only to have it traced back to your donor instead of you! This discovery not only challenges our understanding of genetic identity but also raises profound questions in medicine, law enforcement, and ethics. Explore how this medical marvel is transforming our perception of DNA.