Most common translocation in follicular lymphomas –
**Core Concept**
The question tests the understanding of **genetic abnormalities** in **follicular lymphomas**, specifically focusing on **chromosomal translocations**. Follicular lymphoma is a type of **non-Hodgkin lymphoma** characterized by distinct genetic and molecular features.
**Why the Correct Answer is Right**
The most common translocation in follicular lymphomas involves the **t(14;18) translocation**, which leads to the fusion of the **BCL2 gene** with the **immunoglobulin heavy chain (IgH) locus**. This translocation results in the overexpression of **BCL2 protein**, an anti-apoptotic protein, contributing to lymphomagenesis by promoting cell survival.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because it is not specifically associated with follicular lymphoma.
**Option B:** Incorrect as it is not the most common translocation in follicular lymphomas.
**Option C:** Incorrect because, although it involves a significant genetic alteration, it is not the characteristic translocation of follicular lymphoma.
**Option D:** This is the correct answer but will be discussed in the correct answer section.
**Clinical Pearl / High-Yield Fact**
The **t(14;18) translocation** is a hallmark genetic abnormality in follicular lymphoma, present in approximately 85-90% of cases. This translocation is crucial for the diagnosis and understanding of the pathogenesis of follicular lymphoma.
**Correct Answer:** t(14;18)