Abstract
Differential mRNA display RT–PCR (DD RT–PCR) offers a tool to identify genes which are regulated or responsive to certain receptors or chemicals such as dioxin (TCDD). Treatment of Hep G2 cells with TCDD followed by DD analysis of a gel with series of different primers revealed a significantly different pattern from the control for a number of mRNAs. The differentially displayed mRNAs were isolated and reamplified. A GenBank search of four mRNAs revealed two known and two unknown sequences. Northern blot analysis revealed that two known sequences, fibrinogen γ chain and plastin mRNAs were down regulated by TCDD in a time-dependent manner, whereas two unknown mRNAs were induced by TCDD treatment. The function of these genes in TCDD toxicity is not known; however, the application of DD RT–PCR in the studies of TCDD-induced responses could be very useful in the discovery of other unknown genes important for TCDD toxicity.
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