CPT® Code 81215

Molecular genetic testing is a critical procedure used to identify mutations in the BRCA1 gene, which is located on chromosome 17. The BRCA1 gene plays a vital role in stabilizing genetic material and preventing uncontrolled cell growth, functioning as a tumor suppressor. It is part of a gene family that is responsible for the error-free repair of chromosomal damage and the repair of DNA double strand breaks. When mutations occur in the BRCA1 gene, the gene's ability to repair damaged DNA is compromised, leading to uncontrolled cell proliferation. This malfunction is significantly associated with an increased risk of developing early onset breast and ovarian cancers in females, as well as certain other cancers in both men and women. Specifically, BRCA1 mutations in females are linked to a heightened risk of cervical, uterine, pancreatic, and colon cancers. In males, these mutations increase the risk of breast cancer, as well as pancreatic and testicular cancers. Genetic testing for BRCA1 mutations is essential for identifying hereditary cancer risks, guiding appropriate treatment options, and determining which family members may also be at risk. The testing process typically involves analyzing whole blood or buccal cells. Full sequence analysis is conducted to compare gene segments, identifying similarities or differences that can reveal familial relationships. This analysis includes studying active and post-translational modification sites, gene structures, the distribution of introns and exons, and regulatory elements. Genetic markers are identified through the detection of point mutations or single nucleotide polymorphisms. Additionally, if variants are not identified through sequence analysis, a full duplication/deletion analysis may be performed to detect large gene rearrangements. In normal circumstances, each cell should contain two copies of the BRCA1 gene, except for sex chromosomes; thus, the presence of zero or one copy indicates a deletion variant, while three or more copies suggest a duplication variant. When testing for a known familial variant, the analysis focuses on a specific site of the BRCA1 gene to identify mutations that have already been documented in another family member.