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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Alterations in hepatic gene expression by trivalent chromium in Fundulus heteroclitus.

Cr(III) is the dominant toxicant at some Superfund sites within the United States and therefore we are interested in its effects. Cr(III)s mechanisms are not well studied or understood because of its low bioavailability. We have attempted to characterize the effects of Cr(III) on gene expression in Fundulus heteroclitus (mummichog) liver. The NOEC and LOEC were determined at 32 and 64 mg/L, respectively, by measuring growth and mortality after exposing juveniles for 30 days. Secondary adult male exposures were performed at 32 mg/L, livers excised, and RNA extracted. Arrays were probed with cDNA from untreated or Cr(III)-exposed adult fish and gene expression was quantified. Cr(III) at 32 mg/L altered the expression of five genes, including GSTtau, GSTalpha, and ALDH4. Ultimately, we anticipate using this gene expression information to ascertain whether Cr(III) is bioavailable at potentially adverse concentrations in contaminated sites.[1]


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