Hereditary retinoblastoma develop as a result of which of the following chromosomal deletion?
## **Core Concept**
Hereditary retinoblastoma is a malignant tumor of the retina that primarily affects children. It is associated with mutations in a specific tumor suppressor gene. The underlying principle here involves the genetic basis of tumor development, particularly focusing on tumor suppressor genes.
## **Why the Correct Answer is Right**
The correct answer, **13q14**, is linked to the RB1 gene, a tumor suppressor gene located on the long arm of chromosome 13 (13q14). Mutations or deletions in this gene lead to the development of retinoblastoma. The RB1 gene plays a crucial role in regulating the cell cycle, and its inactivation results in uncontrolled cell proliferation, a hallmark of cancer. The specific chromosomal location **13q14** is critical for identifying the genetic defect responsible for hereditary retinoblastoma.
## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because while various genetic abnormalities can lead to different forms of cancer, **1p13** is not specifically associated with hereditary retinoblastoma.
- **Option B:** Similarly, **11p13** is not linked to retinoblastoma; it's actually associated with Wilms tumor, another type of childhood cancer, through the WT1 gene.
- **Option C:** This option, **15q**, does not correspond to the genetic locus for hereditary retinoblastoma.
## **Clinical Pearl / High-Yield Fact**
A key point to remember is that individuals with hereditary retinoblastoma have an increased risk of developing other types of cancers, due to the germline mutation in the RB1 gene. This highlights the importance of long-term follow-up and genetic counseling for patients and their families.
## **Correct Answer:** . **13q14**