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. 1985 Oct;5(10):2633–2641. doi: 10.1128/mcb.5.10.2633

Liver-specific RNA metabolism in hepatoma cells: variations in transcription rates and mRNA levels.

D F Clayton, M Weiss, J E Darnell Jr
PMCID: PMC366999  PMID: 3841793

Abstract

The transcription rate and abundance of several liver-specific mRNAs as well as mRNAs common to many cell types were compared in a series of rodent hepatoma cell lines, normal liver cells, and primary hepatocyte cultures. The rat hepatoma cell line, Fao, which displays a liver-specific phenotype, contained eight of eight liver-specific mRNAs examined. However, the transcription rates of most liver-specific mRNAs were found to be low (1 to 30%) compared with normal liver in this and other differentiated cell lines. This low rate is similar to the transcription rates of liver-specific mRNA sequences measured in primary cultures of hepatocytes. Several variant cell lines that had lost differentiated traits contained few or none of the liver-specific mRNAs; clonal descendents which had regained differentiated function regained the tissue-specific mRNAs as a group, but at various concentrations. Because all of the changes observed in mRNA levels were not accompanied by parallel changes in transcription of the same sequences, differential posttranscriptional stabilization of the liver-specific mRNAs must also occur in the different cell lines. These results qualify the utility of cultured cell lines in the study of tissue-specific transcriptional control, but raise the possibility that posttranscriptional mechanisms act in cooperation with transcriptional controls to bring the level of tissue-specific mRNAs closer to those found in liver cells.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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