Team:Caltech/Biosafety

Researcher Safety

While most of our project is in lab strains of E. coli, (NIH Risk Group 1) we are culturing organisms from environmental samples that are able to survive in minimal media containing one of the four endocrine disrupting compounds (EDCs) we are hoping to degrade. Past studies have found Pseudomonas species (Kang, Katayama et al. 2006) and Sphingomonas species (Sasaki, Maki et al. 2005) capable of degrading bisphenol A. These genera can be found in NIH Risk Groups 2 and 3. Due to immediately culturing in minimal media, it is unlikely that we will culture any significantly pathogenic organisms from the LA River, according to the Caltech Safety Office.

We are working with endocrine disrupting compounds. These affect the endocrine system by competing with hormones to bind nuclear receptors, and can act as agonists or antagonists affecting the transcription of the many genes controlled by the presence or absence of hormones. We have chosen to focus on those that can bind to the estrogen receptor, as these particular endocrine disruptors have been shown to cause higher prevalence of intersex fish near sources of EDC pollution (Wise, O'Brien et al. 2011). The four chemicals we are focusing on are: bisphenol A, nonylphenol, 17a-ethynylestradiol, and 4,4’-DDT.

These EDCs are harmful to human health. They affect the reproductive system by their nature as endocrine disruptors. 4,4' DDT and 17a-ethynylestradiol are known carcinogens. 17a-ethynylestradiol is a known teratogen (MSDS). We take care to use small amounts and avoid exposure by contact or inhalation. When performing the screen described in Kiyohara et al., 1982, which requires the water-insoluble EDCs to be dissolved in a volatile solvent and sprayed on plates, we will work in the hood with respiratory equipment as required. The safety office also recommends an alternative where we pour on plates rather than spray to minimize inhalation risk. We are doing further research for safe application before attempting this procedure.

Public Safety

Environmental Safety

New BioBricks

Biosafety Regulations

References

4,4' DDT; MSDS No. 386340; Sigma-Aldrich: St. Louis, MO, April 8, 2011.

17a-ethynylestradiol; MSDS No. E4876; Sigma-Aldrich: St. Louis, MO, Jan 18, 2011.

Bisphenol A; MSDS No. 133027; Sigma-Aldrich: St. Louis, MO, March 13, 2010.

Hwang, C., W. Wu, et al. (2009). "Bacterial community succession during in situ uranium bioremediation: spatial similarities along controlled flow paths." The ISME journal 3(1): 47-64

Kang, J. H., Y. Katayama, et al. (2006). "Biodegradation or metabolism of bisphenol A: from microorganisms to mammals." Toxicology 217(2-3): 81-90.

Nonylphenol; MSDS No. 290858; Sigma-Aldrich: St. Louis, MO, July 21, 2010.

Sasaki, M., J.-i. Maki, et al. (2005). "Biodegradation of bisphenol A by cells and cell lysate from Sphingomonas sp. strain AO1." Biodegradation 16: 449-459.

Urgun-Demirtas, M., B. Stark, et al. (2006). "Use of genetically engineered microorganisms (GEMs) for the bioremediation of contaminants." Critical reviews in biotechnology 26(3): 145-164.

Wise, A., K. O'Brien, et al. (2011). "Are Oral Contraceptives a Significant Contributor to the Estrogenicity of Drinking Water?" Environmental Science and Technology 45(1): 51-60.