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Scientific article
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English

An approach to analyse the specific impact of rapamycin on mRNA-ribosome association

Contributors

Genolet, Raphaël; Araud, Tanguy; Maillard, Laetitia; Jaquier-Gubler, Pascale; Curran, Joseph

Published in

BMC medical genomics, vol. 1, no. 33

Publication date

2008

Abstract

BACKGROUND: Recent work, using both cell culture model systems and tumour derived cell lines, suggests that the differential recruitment into polysomes of mRNA populations may be sufficient to initiate and maintain tumour formation. Consequently, a major effort is underway to use high density microarray profiles to establish molecular fingerprints for cells exposed to defined drug regimes. The aim of these pharmacogenomic approaches is to provide new information on how drugs can impact on the translational read-out within a defined cellular background. METHODS: We describe an approach that permits the analysis of de-novo mRNA-ribosome association in-vivo during short drug exposures. It combines hypertonic shock, polysome fractionation and high-throughput analysis to provide a molecular phenotype of translationally responsive transcripts. Compared to previous translational profiling studies, the procedure offers increased specificity due to the elimination of the drugs secondary effects (e.g. on the transcriptional read-out). For this pilot "proof-of-principle" assay we selected the drug rapamycin because of its extensively studied impact on translation initiation. RESULTS: High throughput analysis on both the light and heavy polysomal fractions has identified mRNAs whose re-recruitment onto free ribosomes responded to short exposure to the drug rapamycin. The results of the microarray have been confirmed using real-time RT-PCR. The selective down-regulation of TOP transcripts is also consistent with previous translational profiling studies using this drug. CONCLUSION: The technical advance outlined in this manuscript offers the possibility of new insights into mRNA features that impact on translation initiation and provides a molecular fingerprint for transcript-ribosome association in any cell type and in the presence of a range of drugs of interest. Such molecular phenotypes defined pre-clinically may ultimately impact on the evaluation of a particular drug in a living cell.

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UNIGE research groups

Citation (ISO format)

GENOLET, Raphaël et al. An approach to analyse the specific impact of rapamycin on mRNA-ribosome association. In: BMC medical genomics, 2008, vol. 1, n° 33. doi: 10.1186/1755-8794-1-33

Main files (1)

Article (Accepted version)

Identifiers

Additional URL for this publication

http://www.biomedcentral.com/1755-8794/1/33

Journal ISSN

1755-8794
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536downloads

Technical informations

Creation

19/01/2009 16:23:00

First validation

19/01/2009 16:23:00

Update

15/04/2025 15:00:18

Status update

15/04/2025 15:00:18

Last indexation

15/04/2025 15:00:19
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