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ToxSci Advance Access published online on November 8, 2006
Toxicological Sciences, doi:10.1093/toxsci/kfl161
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© The Author 2006. Published by Oxford University Press on behalf of the Society of Toxicology. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org
Received September 15, 2006
Accepted November 1, 2006

Environmental Toxicology

Development and Validation of Endogenous Reference Genes for Expression Profiling of Medaka (Oryzias latipes) Exposed to Endocrine Disrupting Chemicals by Quantitative Real-Time RT-PCR

Zhaobin Zhang 1 and Jianying Hu 1 *

1 College of Environmental Science, Peking University, Beijing, 100871, China

* To whom correspondence should be addressed.
Jianying Hu, E-mail: hujy{at}urban.pku.edu.cn


  Abstract

The quantitative real-time reverse transcription polymerase chain reaction (Q-RT-PCR) technique has been increasingly used in endocrine disrupting chemicals (EDCs) research. Usually, an appropriate endogenous control gene is critical for Q-RT-PCR to normalize the errors and sample-to-sample variations that occur in the course of tissue collection, RNA isolation and RT-PCR. In this study, we cloned ribosomal protein L7 (RPL-7) from medaka (Oryzias latipes), and then used Q-RT-PCR to study its transcription characteristics and those of GAPDH, {beta}-actin, mitochondrial 16s ribosomal RNA (16S rRNA) and 18S rRNA. Of the five genes, RPL-7 and 18S rRNA were expressed with the less-variance among the same tissue samples, in different tissues and stages of development, and were unaffected by EDCs exposure. The expression levels of RPL-7 among different tissues were between 9.76 x 106 ± 9.49 x 105 and 1.39 x 107 ± 1.69 x 106 copies/µg RNA, but those of 18S rRNA were as high as 4.48x1011±5.95x1010 to 5.90x1011±1.21x1010 copies/µg RNA, which is above the usual detection scope of Q-RT-PCR if no cDNA-reaction dilution is performed. As a result, RPL-7 is the single suitable endogenous control gene for expression profiling in future studies, especially in studies on the EDCs issue using medaka.

Keywords: Quantitative real-time RT-PCR; Endocrine disruption; Endogenous control; Oryzias latipes.
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