Author Interviews, Breast Cancer, JAMA, USPSTF / 12.09.2019

MedicalResearch.com Interview with: Dr. Carol Mangione, M.D., M.S.P.H., F.A.C.P. Division Chief of General Internal Medicine and Health Services Research Professor of Medicine Barbara A. Levey, MD, and Gerald S. Levey, MD, endowed chair in Medicine David Geffen School of Medicine University of California Los Angeles Professor of public health at the UCLA Fielding School of Public Health.  MedicalResearch.com: What is the background for this study? Response: We all want to find better ways to help prevent breast cancer, a disease that impacts the lives of too many women in the United States each year. Fortunately, the Task Force found there are steps that women at increased risk can take to reduce their chances of developing breast cancer. (more…)
Author Interviews, Breast Cancer / 07.10.2014

Professor Xiaodong Zhang Professor of Macromolecular Structure and Function Department of Medicine Imperial College, London, UKMedicalResearch.com Interview with: Professor Xiaodong Zhang Professor of Macromolecular Structure and Function Department of Medicine Imperial College, London, UK Medical Research: What are the main findings of the study? Prof. Zhang: Since its discovery 20 years ago, the BRCA2 gene and its protein product, BRCA2, have been under intensive investigations. The importance of the BRCA2 protein lies in the central roles it plays in the most faithful DNA damage repair pathway. Mutations in BRCA2 thus can cause defects in this repair pathway, making the repair inefficient or forcing cells to use alternative repair methods that are prone to mistakes, all of which contribute to mutations in the genomic DNA, thus increase the risk of cancer development. Our study aims to understand how BRCA2 works through studying its 3-dimensional structures and its interactions with other key partners in the repair pathway. Our study provides first 3-dimensional views of BRCA2 and BRCA2-RAD51 and reveals that BRCA2 molecules exist as pairs and a BRCA2 pair recruit two sets of RAD51 molecules arranged in opposite orientations. Our study also shows a single stranded DNA binds across the BRCA2 dimer and that BRCA2 increases the frequency of RAD51 filament formation events, presumably to increase the efficiency of establishing a longer filament required for searching for matching strands of DNA in intact sister chromatin. Our results thus not only define the precise roles of BRCA2 in helping RAD51 filament formation, but how it helps RAD51 loading onto single stranded DNA. (more…)