BRCA 1 & 2 genes are located on chromosomes
**Core Concept**
The BRCA1 and BRCA2 genes are tumor suppressor genes that play a crucial role in maintaining genomic stability by repairing DNA damage through homologous recombination. Mutations in these genes significantly increase the risk of developing breast and ovarian cancers.
**Why the Correct Answer is Right**
The BRCA1 gene is located on chromosome 17q21, while the BRCA2 gene is located on chromosome 13q12.3. These genes encode proteins that are essential for the repair of double-strand DNA breaks through the homologous recombination pathway. Defects in these genes lead to genomic instability, which can result in cancer development. The BRCA1 protein interacts with other proteins, such as BRCA2, to facilitate the repair of DNA damage, whereas BRCA2 has a more extensive role in homologous recombination.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not provided.
**Option B:** This option is not provided.
**Option C:** This option is not provided.
**Option D:** This option is not provided.
**Clinical Pearl / High-Yield Fact**
It's essential to note that BRCA mutations are inherited in an autosomal dominant pattern, meaning that a single copy of the mutated gene is sufficient to increase the risk of cancer. Therefore, individuals with a family history of breast or ovarian cancer should undergo genetic testing for BRCA mutations.
**Correct Answer:** D.