Our Science – Nussenzweig Website
Andre Nussenzweig, Ph.D.
Genomic instability is a hallmark of cancer. Central to a cell's ability to maintain genomic stability are systems that monitor and repair DNA double strand breaks (DSBs). DSBs occur during normal DNA replication, in response to chemotherapeutic agents, and during physiological reactions including meiotic recombination in germ cells and antigen receptor rearrangements in lymphocytes. If not rapidly and faithfully repaired, DSBs can also be substrates for aberrant chromosomal translocations, which promote cancer.
The focus of the Recombination Unit is to understand the mechanisms by which all cell types monitor and repair DSBs. Our research has 3 major goals: 1) Determine the mechanisms by which cells detect, signal and repair DSBs; 2) Elucidate the mechanisms by which oncogenic translocations form; 3) determine the influence of chromatin structure on the maintenance of genomic stability. Our past achievements in these areas form the basis of ongoing and future research.
- DNA damage signaling and repair: One aim of the previous proposal was to gain a better mechanistic understanding of the interplay between DNA damage detection and signaling in vivo. To this end, we determined the biological impact of impaired Nbs1 function at the cellular and organismal level, we gained a better mechanistic understanding of the pathways that activate ATM, we discovered that ATM prevents un-repaired DNA breaks from propagating from one generation to the next, we found that replicative stress mediated by the ATR kinase contributes to aging and we described a DNA-Pkcs dependent pathway that regulates DNA repair and activation of p53 in the absence of ATM. One major current effort is to study the interplay between NHEJ, HR and cell cycle checkpoints in maintaining genomic stability.
- Oncogenic translocations: Activation induced cytodine deaminase (AID) is an enzyme that is essential for somatic hypermutation and class-switching. In 2005, we devised a method to monitor chromosome translocations between c-myc and IgH in vitro. We then performed a series of studies aimed at understanding pathways that normally survey and protect against AID-dependent DNA damage: First, we determined that the catalytic activity of AID is required for generation of c-myc/IgH translocations, we then showed that AID is required for the chromosomal breaks in c-myc, and that AID in fact produces DSBs in many non-Ig genes, which in turn promote B cell lymphomagenesis. During the course of these studies we also described DNA damage- and oncogenic stress-induced checkpoints that protect against AID-dependent DNA damage. One of the earliest responses to AID induced damage is the formation of nuclear foci of 53BP1. Besides playing an essential role in CSR, we discovered a more general function for 53BP1 in maintaining genomic stability during long-range joining of DNA breaks. Although 53BP1 is a tumor suppressor, we found that the embryonic lethality and tumorigenesis induced by Brca1 mutation can be alleviated by 53BP1 deletion. One major current effort is to understand the mechanism by which loss of 53BP1 prevents translocations and tumorigenesis in Brca1 mutant cells and regulates class switching.
- Role of chromatin structure in maintaining genomic stability: Another important challenge is to understand the effects of chromatin on DNA repair, and how this 'chromatin barrier' is relieved to enable DSB repair. In 2005, we devised a sensitive method to examine the changes in chromatin structure in living cells at sites of DSBs. We discovered that while DSBs remain relatively immobile over time, chromatin undergoes a marked reorganization (decondensation) in response to DSB. More recently, we have been studying the chromatin changes critical for immunogloblulin class switch recombination (CSR). We have discovered that a component of the histone methyltransferase complex called PTIP is essential for CSR by promoting histone H3 lysine 4 tri-methylation and transcription of switch regions. In AIM 3, we propose to further investigate the relationship between histone methylation, transcription and DNA repair during antigen receptor rearrangements.
The recombination unit meets once a week, alternating between lab meetings and journal clubs. In addition, we have individual meetings on a daily basis to discuss research projects. All of the postdocs in the laboratory attend at least one meeting a year to present their data. Below are some of the former member of our laboratory.
- Samuel Bunting He is now an assistant professor at the Department of Molecular Biology and Biochemistry at Rutgers University. Sam completed his postdoctoral training in 2012, and at the same year received the NIH Pathway to Independence Award (K99/R00).
- Jeremy Daniel After completing his postdoctoral fellowship in 2011, he holds an independent investigator position at the University of Copenhagen. He was awarded the NIH Pathway to Independence Award (K99/R00) at the same year.
- Simone Difilippantonio He was a Staff Scientist and fellow in the laboratory, and currently holds a Senior Scientist position in the Center of Advanced Preclinical Research at NCI Frederick.
- Elsa Callen After completing his postdoctoral fellowship in 2007, she hold a Staff Scientist position at the National Institutes of Health.
- Manuella Pellegrini After completing his postdoctoral fellowship in 2007, she holds an independent investigator position at the University of Rome.
- Oscar Fernandez-Capetillo A former postdoc in the lab, became a tenured investigator at the Spanish National Cancer Center in Madrid in 2010. He is an HMMI International Early Career Scientist.
- Alicia Lee Together with Dr. Stephen Jackson (Cambridge University), Dr. Nussenzweig co-mentored Dr. Alicia Lee, who obtained her Ph.D. from the NIH/Cambridge Scholars program in 2006.
This page was last updated on 5/8/2013.