Molecular, Cell and Systems Biology

Jeff Bachant

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Phone: (951) 827-6473
Fax: (951) 827-3087
Office Location: 2113 Biological Sciences
Office Hours:
Email: jeffrey.bachant@ucr.edu

Jeff Bachant, Ph.D.

Associate Professor of Cell Biology


Mitosis is a precisely regulated event during which equivalent sets of chromosomes are partitioned between mother and daughter cells. Research in this lab is focused on the mechanisms that ensure accurate mitotic chromosome transmission and that make mitotic entry responsive to stressful contingencies. One area of study is to elucidate how replicated pairs of chromosomes are physically held together, or cohesed, until the onset of chromosome segregation. Cohesive linkages between sister chromatids are thought to enable chromatid pairs to achieve bipolar attachment to the mitotic spindle. Centromeric regions of chromosomes appear to be specialized sites of sister chromatid association, but the processes that control this aspect of centromere function are not well understood. We are utilizing the budding yeast S. cerevisiae to investigate how cohesion is regulated at centromeres through the analysis of mutants that disrupt chromatid associations at centric regions. Other projects are focused on understanding how chromosome segregation is delayed following activation of the checkpoint pathways that allow cells to respond to DNA damage or blocks to DNA replication. In S. cerevisiae, DNA damage checkpoints prevent chromosome segregation by blocking cells in a pre-anaphase state. Analysis of this response may illuminate regulatory pressure points controlling mitotic spindle function and the timing of chromosome segregation.


  • Sanchez, Y., Bachant, J., Wang, H., Hu, F., Liu, D., Tetzlaff, M. and Elledge, S.J. (1999) Control of the DNA damage checkpoint by Chk1 and Rad53 protein kinases through distinct mechanisms. Science 286: 1166-1171.
  • Jones SH, J Bachant, AR Castillo, TH Giddings and M Winey (1999) Yeast Dam1p is required to maintain spindle integrity during mitosis and interacts with the Mps1 kinase. Mol. Biol. Cell 10: 2377-2391.
  • Desany, B., Alcasabas, A., Bachant, J. and Elledge, S.J. (1998) Recovery from DNA replicational stress is the essential function of the S-phase checkpoint pathway. Genes & Dev. 12: 2956-2970.

Manuscripts submitted or in preparation:

  • Bachant J, A. Alcasabas, Y. Blat, N Kleckner and SJ Elledge. A role for the SUMO-1 isopeptidase Smt4 and DNA Topoismerase II in control of centromeric cohesion. Under revision.
  • Alcasabas, AA, AJ. Osborn, J Bachant, F Hu, PJH. Werler, K Bousset, K Furuya, JFX Diffley, A Carr, and SJ Elledge. Mediator of the DNA Replication Checkpoint, MRC1, Transduces DNA Replication Stress Signals to Activate Rad53. Submitted.
  • Bachant J, Y. Li, A. Alcasabas, and SJ Elledge. Centromere function and inhibition of origin firing are required for pre-anaphase spindle integrity during budding yeast S phase checkpoint arrest. In preparation.
  • Li, Y. Bachant, J., Alcasabas, AA, and SJ Elledge. The mitotic spindle communicates to the kinetochore through transfer of the Ask1 protein. In preparation.

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University of California, Riverside
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Tel: (951) 827-1012

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Molecular, Cell and Systems Biology
2111 Biological Sciences Bldg.

Manuela Martins-Green: Chair of Molecular, Cell and Systems Biology
Tel: (951) 827-2831
Fax: (951) 827-3087
E-mail: manuela.martins@ucr.edu