Despite the extensive work being performed to understand cancer and carcinogenic properties of chemicals and other agents, there are still gaps in our ability to efficiently identify carcinogens, and elucidate their mode(s) of action. The current state of assays designed to examine mutation and carcinogenic mechanisms are especially limited by their high costs and low throughput capacities. This laboratory has developed a gene mutation assay that is based on the endogenous Pig-a gene. The Pig-a gene product is essential for the biosynthesis of glycosyl phosphatidylinositol (GPI) anchors. Mutations giving rise to nonfunctional GPI anchors prevent certain proteins from being expressed on the cell surface, and this represents a phenotype that can be measured by flow cytometry. The work proposed herein will extend our development efforts by creating a suite of assays that represent a platform for studying a key mode of carcinogenic action, mutation. By devising Pig-a based methods that examine cells in culture, laboratory rodents, and human subjects, a truly comprehensive bridging biomarker will be realized. The bridging capabilities and high throughput nature of the proposed mutation assessment tools will contribute significantly to important areas of research that include academic, regulatory, and industrial settings.

Public Health Relevance

The ability to efficiently and comprehensively study mutation, a key pathway of carcinogenesis, is critical for gaining insight into this complex disease, and for elucidating carcinogens'mode of action. We will develop a suite of complementary assays based on an endogenous reporter gene, Pig-a. An important feature of these assays will be their compatibility with high throughput, automated scoring methods, and their ability to bridge between cells in culture, whole animals models, and humans.

Agency
National Institute of Health (NIH)
Institute
National Institute of Environmental Health Sciences (NIEHS)
Type
Small Business Innovation Research Grants (SBIR) - Phase II (R44)
Project #
1R44ES021973-01
Application #
8313569
Study Section
Special Emphasis Panel (ZRG1-OTC-H (13))
Program Officer
Shaughnessy, Daniel
Project Start
2012-07-01
Project End
2012-12-31
Budget Start
2012-07-01
Budget End
2012-12-31
Support Year
1
Fiscal Year
2012
Total Cost
$199,988
Indirect Cost
Name
Litron Laboratories, Ltd.
Department
Type
DUNS #
085992055
City
Rochester
State
NY
Country
United States
Zip Code
14623
Dertinger, Stephen D; Phonethepswath, Souk; Avlasevich, Svetlana L et al. (2014) Pig-a gene mutation and micronucleated reticulocyte induction in rats exposed to tumorigenic doses of the leukemogenic agents chlorambucil, thiotepa, melphalan, and 1,3-propane sultone. Environ Mol Mutagen 55:299-308
Avlasevich, Svetlana L; Phonethepswath, Souk; Labash, Carson et al. (2014) Diethylnitrosamine genotoxicity evaluated in sprague dawley rats using pig-a mutation and reticulocyte micronucleus assays. Environ Mol Mutagen 55:400-6
Dertinger, Stephen D; Avlasevich, Svetlana L; Torous, Dorothea K et al. (2014) Persistence of cisplatin-induced mutagenicity in hematopoietic stem cells: implications for secondary cancer risk following chemotherapy. Toxicol Sci 140:307-14