What does allogenic mean in medical terms?

Allogenic refers to cells, tissues, or organs that come from a genetically different individual of the same species. In the context of medical transplantation, allogenic grafts refer to transplants between individuals who are not genetically identical, such as from a donor to a recipient within the same species.

For example, in allogenic bone marrow transplantation, bone marrow cells are taken from a donor and transplanted into a recipient whose immune system is compromised or damaged. Since the donor and recipient have different genetic backgrounds, the immune cells in the transplanted bone marrow may recognize the recipient's tissues as foreign and initiate an immune response against the graft. This immunological incompatibility can lead to graft-versus-host disease (GVHD), a serious complication in allogenic transplantation.

To minimize the risk of GVHD and ensure successful graft acceptance, careful matching between the donor and recipient is necessary. This involves evaluating factors such as tissue compatibility (HLA matching), blood type compatibility, and other genetic markers to ensure the best possible match for the recipient.