In familial mediterranean fever, the gene encoding the following protein undergoes mutation-
**Core Concept**
Familial Mediterranean fever (FMF) is an autosomal recessive genetic disorder characterized by recurrent episodes of fever and inflammation. It primarily affects individuals of Mediterranean descent, hence the name. The condition is caused by mutations in the _MEFV_ gene, which encodes a protein involved in the regulation of inflammation.
**Why the Correct Answer is Right**
The _MEFV_ gene encodes the pyrin protein, which plays a crucial role in the regulation of the inflammasome complex. The inflammasome is a multiprotein complex that activates the inflammatory response in response to various stimuli. Mutations in the _MEFV_ gene lead to the production of a dysfunctional pyrin protein, resulting in the uninhibited activation of the inflammasome and subsequent inflammation. This is the underlying mechanism behind the recurrent episodes of fever and inflammation seen in FMF patients.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not relate to FMF. While mutations in other genes can cause various inflammatory disorders, the _MEFV_ gene is specifically associated with FMF.
* **Option B:** This option is incorrect because it is not the correct gene associated with FMF. Although other genes may be involved in inflammatory disorders, the _MEFV_ gene is the primary cause of FMF.
* **Option C:** This option is incorrect because it is not the correct protein associated with FMF. While other proteins may be involved in the regulation of inflammation, the pyrin protein encoded by the _MEFV_ gene is the key player in FMF.
**Clinical Pearl / High-Yield Fact**
Mnemonic: "Mediterranean Fever" can be remembered as "M - Mediterranean, E - Ethnic predisposition, F - Fever, V - Vasculitis, E - Episodes of inflammation, R - Recurrent". This helps to recall the key features of FMF.
**Correct Answer: D. MEFV gene**