Centrosome Regulation by Proteolysis in C. elegans

Information

  • Research Project
  • 9516370
  • ApplicationId
    9516370
  • Core Project Number
    R15GM128110
  • Full Project Number
    1R15GM128110-01
  • Serial Number
    128110
  • FOA Number
    PA-16-200
  • Sub Project Id
  • Project Start Date
    7/1/2018 - 6 years ago
  • Project End Date
    6/30/2021 - 3 years ago
  • Program Officer Name
    GINDHART, JOSEPH G
  • Budget Start Date
    7/1/2018 - 6 years ago
  • Budget End Date
    6/30/2021 - 3 years ago
  • Fiscal Year
    2018
  • Support Year
    01
  • Suffix
  • Award Notice Date
    6/28/2018 - 6 years ago
Organizations

Centrosome Regulation by Proteolysis in C. elegans

Program Director/Principal Investigator (Last, First, Middle): Song, Mi Hye Summary The centrosome is the primary microtubule-organizing center in animal cells, and is vital for the maintenance of genomic integrity. For the fidelity of cell division, the centrosome must duplicate only once per cell cycle, and duplicated centrosomes establish bipolar spindles that are crucial for accurate chromosome segregation. Aberrant centrosomes are often associated with many human disorders including cancers and microcephaly, where extra centrosomes lead to chromosome segregation errors and abnormal cell proliferation leading to genomic instability and defective brain development. Our long-term goal is to elucidate the molecular mechanisms of centrosome assembly and function using the C. elegans embryo as an in vivo model. The overall objective is to understand how the anaphase promoting complex/cyclosome (APC/C) and a cofactor FZR-1 (a homolog of human Cdh1) regulates centrosome assembly by proteolysis. The APC/C complex is an E3 ubiquitin ligase that ubiquitinates its substrates for proteasomal destruction. FZR-1/Cdh1 is an APC/C cofactor that confers a specific substrate-binding through recognition of conserved motifs. Cdh1-deficient mouse exhibits embryonic lethality and genomic instability. In animal cells, proper levels of centrosome proteins are critical for the correct number of centrosomes, which is regulated by the timely proteolysis. While we realize the great impact of the APC/C complex for proper cell division, we understand little about how the APC/C-mediated proteolysis contributes to normal centrosome assembly. Our hypothesis is that the APC/CFZR-1 targets a key centrosome factor(s) and other effectors to orchestrate proper levels and subcellular localization in a cell cycle dependent manner. Identifying specific substrates of the APC/CFZR-1 in centrosome assembly and defining the role will reveal the mechanisms of the APC/CFZR-1 in centrosome regulation required for the fidelity of cell division. The aims of the project are to (1) determine a specific substrate(s) of the APC/CFZR-1 that compensates for impaired ZYG-1 function in centrosome assembly, (2) characterize how the APC/CFZR-1-mediated proteolysis of a specific substrate influences centrosome assembly, and (3) to identify new substrates of the APC/CFZR-1 involved in centrosome regulation. Successful completion of these aims will reveal fundamental mechanisms underlying centrosome assembly and function, an important cellular process for faithful cell division. These studies are relevant to the diagnosis and treatment of the large spectrum of human cancers and microcephaly in addition to advancing the field of centrosome biology.

IC Name
NATIONAL INSTITUTE OF GENERAL MEDICAL SCIENCES
  • Activity
    R15
  • Administering IC
    GM
  • Application Type
    1
  • Direct Cost Amount
    300000
  • Indirect Cost Amount
    142500
  • Total Cost
    442500
  • Sub Project Total Cost
  • ARRA Funded
    False
  • CFDA Code
    859
  • Ed Inst. Type
    SCHOOLS OF ARTS AND SCIENCES
  • Funding ICs
    NIGMS:442500\
  • Funding Mechanism
    Non-SBIR/STTR RPGs
  • Study Section
    NCSD
  • Study Section Name
    Nuclear and Cytoplasmic Structure/Function and Dynamics Study Section
  • Organization Name
    OAKLAND UNIVERSITY
  • Organization Department
    BIOLOGY
  • Organization DUNS
    041808262
  • Organization City
    ROCHESTER
  • Organization State
    MI
  • Organization Country
    UNITED STATES
  • Organization Zip Code
    483094422
  • Organization District
    UNITED STATES