BRCA1 Gene: Breast Cancer Gene 1

The BRCA1 gene produces a protein essential for repairing damaged DNA. When functioning properly, BRCA1 helps prevent cells from growing uncontrollably. Certain inherited variants can significantly increase cancer risk.

What Does the BRCA1 Gene Do?

BRCA1 protein works as a tumor suppressor by repairing double-strand DNA breaks through homologous recombination. It also helps regulate cell cycle checkpoints and maintains chromosomal stability.

Key BRCA1 Variants

Pathogenic variants: Over 1,800 pathogenic BRCA1 variants have been identified. These are relatively rare in the general population but significantly increase cancer risk.

Variants of uncertain significance: Many BRCA1 variants have unknown clinical implications and require ongoing research.

Health Impacts

• Breast cancer risk (up to 72% lifetime risk with pathogenic variant)
• Ovarian cancer risk (up to 44% lifetime risk)
• Other cancer associations (pancreatic, prostate)
• DNA repair capacity
• Treatment response implications

Evidence-Based Recommendations

• Discuss family history with healthcare provider
• Consider genetic counseling before BRCA testing
• Pathogenic carriers: Enhanced screening protocols
• Risk-reducing options available for high-risk individuals
• Note: Most BRCA1 variants are benign or uncertain significance

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