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01
Feb
BRCA1 Gene: DNA Repair Mechanisms and Cancer Risk
BRCA1 is a well-characterized tumor suppressor gene first identified in 1990. It plays a critical role in maintaining genomic integrity by regulating DNA repair and cell cycle control. Loss-of-function mutations in BRCA1 are strongly associated with hereditary breast and ovarian cancer.
Basic Information
Discovery & Location
Located on chromosome 17q21, the BRCA1 gene spans approximately 22 exons and encodes a multifunctional nuclear protein essential for cell stability.
Physiological Function
It suppresses tumor development primarily by repairing DNA damage. Pathogenic mutations disrupt these pathways, leading to malignant transformation.
Cancer Risk & Clinical Impact
- ◈ High Susceptibility: Mutation carriers face a 50%–85% lifetime risk of breast cancer and a 15%–45% risk of ovarian cancer.
- ◈ Disease Profile: Often linked to triple-negative breast cancer and early-onset ovarian cancer (before age 50).
Genetic Testing & Prevention
| Strategy | Actionable Steps |
|---|---|
| Clinical Screening | Risk stratification and early surveillance for informed decision-making. |
| Prevention | Prophylactic surgery (mastectomy/oophorectomy) and pharmacological interventions. |
Recent Research Advances
Current research emphasizes the molecular mechanisms of the BRCA1 protein complex. It works alongside PALB2 and RAD51 to facilitate homologous recombination repair (HRR) of double-strand DNA breaks.
Note: Most identified pathogenic variants are inherited in an autosomal dominant manner.
Related Research Genes
BRCA2: Cooperates in HR-mediated repair and shares clinical relevance.
Biofargo team
