BRCA1also known as RNF53 is a 190 kD nuclear phosphoprotein that plays a crucial role in maintaining genomic stability and is essential for the repair of DNA double-strand breaks through homologous recombination, a process vital for preventing mutations that can lead to cancer. BRCA1 is predominantly located in the nucleus, where BRCA1 interacts with other proteins involved in DNA repair and cell cycle regulation, underscoring BRCA1′s importance in tumor suppression. Mutations in the BRCA1 gene can disrupt these critical functions, leading to an increased risk of breast and ovarian cancers, making BRCA1 research essential for understanding cancer biology and developing targeted therapies.