A 21-year-old patient in severe kidney failure receives a kidney from his 30-year-old brother. This type of transplantation is best described by which of the following?
**Core Concept**
The scenario describes a kidney transplant between two individuals with a close genetic relationship, which is a common situation in organ transplantation. The underlying concept being tested is the compatibility of the donor and recipient in terms of human leukocyte antigen (HLA) matching.
**Why the Correct Answer is Right**
In this scenario, the transplant is between two siblings, increasing the likelihood of HLA matching. HLA matching is crucial in organ transplantation to reduce the risk of graft rejection. The siblings share a similar genetic makeup, making it more likely for the donor kidney to be accepted by the recipient's immune system. This is because they share a similar HLA profile, which includes HLA-A, HLA-B, HLA-C, HLA-DP, HLA-DQ, and HLA-DR genes.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option does not apply to the scenario as it is not relevant to the compatibility between the donor and recipient.
* **Option B:** This option is incorrect as it refers to a different type of transplantation, where the donor and recipient are not genetically related.
* **Option D:** This option is incorrect as it refers to a specific type of transplant rejection, which is not relevant to the scenario.
**Clinical Pearl / High-Yield Fact**
In organ transplantation, HLA matching between the donor and recipient is crucial in reducing the risk of graft rejection. Siblings have a higher chance of being HLA matched, making them ideal donors for each other.
**Correct Answer:** C.