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Maria Jasin, PhD

Professor, Weill Graduate School of Medical Sciences,
Cornell University
Member, Developmental Biology Program
Memorial Sloan Kettering Cancer Center
New York, New York

Current Research

  • Seeking to understand the evolution of BRCA-related breast cancers and identify new therapeutic targets to prevent breast cancer.

  • Laboratory studies are conducted to examine the influence of hormone fluctuations and normal mammary gland changes on BRCA-associated breast cancer risk.

  • These studies will provide new insight into potential therapeutic targets for prevention of BRCA breast cancers.

Multiple risk factors are linked to breast cancer incidence including reproductive history, exposure to DNA damaging agents, and genetic background. Mutations in genes involved in the cellular response to DNA damage and the repair of double-strand breaks in DNA, including BRCA1 and BRCA2, are associated with breast cancer susceptibility.

The mammary gland undergoes significant changes during puberty and pregnancy and is highly influenced by fluctuations in its hormonal environment. Little is known, however, about how these changes impact DNA repair and breast cancer susceptibility in women who harbor mutations in the BRCA genes.

The BRCA1 and BRCA2 genes control key processes in DNA damage repair. When either gene is mutated, cells cannot adequately repair normal DNA damage. This creates a condition known as genomic instability–meaning that DNA damage is passed on to daughter cells and accumulates over multiple cell divisions–and increases the risk of breast and ovarian cancer in women. 

Dr. Jasin is conducting studies to understand how mammary gland developmental changes and hormone exposure affects the DNA damage response in normal mammary tissue compared to mammary tissue with mutations in BRCA genes.

Results from these studies will yield valuable insight into how DNA repair processes in breast cells may be manipulated therapeutically to prevent breast cancer. 


Maria Jasin is an investigator at Memorial Sloan Kettering Cancer Center and the Weill Cornell Graduate School of Medical Sciences, New York. She obtained her Ph.D. from the Massachusetts Institute of Technology, and was a postdoctoral researcher at the University of Zürich and Stanford University prior to joining the faculty at MSKCC.

Her research focuses on the repair of DNA breaks in chromosomes in several contexts, including during gamete development, in chromosomal translocation formation, and for gene editing, where her lab performed the first such experiment. Her understanding of DNA repair mechanisms, in particular, homologous recombination, led her laboratory to studies of the cellular roles of the breast cancer suppressors BRCA1 and BRCA2. Her studies found that both proteins are critical for homologous recombination to repair DNA breaks. Mechanistically, however, the proteins act at different steps in the pathway, such that BRCA1 and BRCA2 tumors are predicted to have both distinct and overlapping second site mutations that affect therapy resistance. Moreover, her laboratory has provided insight into the critical occurrence of replication stress arising from loss of BRCA2 and the involvement of p53. Given the high predisposition to breast cancers, a current research focus is to understand DNA repair in the breast at different developmental stages and contexts. Her research accomplishments have led to election to the National Academies of Sciences and Medicine and the American Academy of Arts and Sciences.

BCRF Investigator Since