Jennifer A. Cobb

Professor

Department of Biochemistry & Molecular Biology

Member

Arnie Charbonneau Cancer Institute

Molecular Biology and Disease

B.Sc. (Bachelor of Science) Ph.D. (Doctor of Philosophy)


Contact information

Location


Research and teaching

Research Activities

One major question in cancer genetics is to what extent chromosomal instability is the beginning of tumorigenesis. RecQ helicases have been called caretakers of the genome and it is well documented that the loss of RecQ function leads to the breakdown in the maintenance of genome integrity and an elevated predisposition to cancer. We are investigating the function of RecQ at the molecular level using Saccharomyces cerevisiae as a model system. It is quite evident that mechanisms that preserve genome stability in yeast are indeed the same as those which go awry in many mammalian cancers. We are focusing on the relationship between Sgs1 and the MRX complex and determining if RecQ helicases preserve fragile site stability in slow replicating regions of the genome.

We are also interested to understand the mechanism of checkpoint activation during S phase. In particular how Mec1-Ddc2 (human ATR-ATRIP) is recruited to stalled replication forks to stabilize components of the replisome. It is well understood that Mec1-Ddc2 activates Rad53 and that it is recruited to both DSBs and stalled replication forks. However, much of what is thought to happen at stalled replication forks has been implied from events at DSBs. In mammals the affinity of ATRIP for RPA suggests a model in which ATR-ATRIP is recruited to DSBs through interaction with RPA-bound single-stranded DNA (ssDNA). Currently, we are characterizing Mec1-Ddc2 localization to stalled replication forks and the signals/factors involved in its recruitment.

Research Areas: 

Molecular Biology and Disease

Research Personnel: 

  • Dr. Aditya Mojumdar, Postdoctoral Fellow
  • Dr. Nancy Adam, Postdoctoral Fellow
  • Nicola Mair, Ph.D. Graduate Student
  • Jack Attewell, Ph.D. Graduate Student
  • Laura Sosa Ponce, PhD Graduate Student co-supervise with Dr. Vanina Zaremberg
  • Shilpa Salgia, M.Sc. RDSC Manager
  • Carin Pihl, Lab Technician
  • Jumi Lee, Administrative Assistant

 

 


Publications

PubMed