Abstract
Differential regulation of gene expression is essential for cell fate specification in metazoans. Characterizing the transcriptional activity of gene promoters, in time and in space, is therefore a critical step toward understanding complex biological systems. Here we present an in vivo spatiotemporal analysis for ∼900 predicted C. elegans promoters (∼5% of the predicted protein-coding genes), each driving the expression of green fluorescent protein (GFP). Using a flow-cytometer adapted for nematode profiling, we generated 'chronograms', two-dimensional representations of fluorescence intensity along the body axis and throughout development from early larvae to adults. Automated comparison and clustering of the obtained in vivo expression patterns show that genes coexpressed in space and time tend to belong to common functional categories. Moreover, integration of this data set with C. elegans protein-protein interactome data sets enables prediction of anatomical and temporal interaction territories between protein partners.
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Acknowledgements
This work was funded by the National Cancer Institute (NCI 4 R33 CA097516-02)(M.V.), Genome British Columbia, the Canadian Institute of Health Research and Genome Canada (D.B. and D.G.M.), the NetWork Bench National Science Foundation (IIS-0513650), the Muscular Dystrophy Association, the National Institutes of Health (NIH) (1 P20 CA11300-01, A.L.B. and HD43156, W.A.M.) and the Helen Kellogg Institute for International Studies (C.A.H.R.). F.P.R. was supported in part by NIH grant HG003224. M.T. was supported by NIH NRSA Fellowship HG004098. Some nematode strains used in this work were provided by the Caenorhabditis Genetics Center, which is funded by the NIH National Center for Research Resources. Thanks to Tracey Clingingsmith and Abigail Bird for their indispensable assistance and to Michael Cusick and Mike Boxem for careful proofreading of the manuscript.
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Transgenic animals were generated by ballistic transformation by J.S. and J.R.-H. under the supervision of I.A.H., and by microinjection by D.T. and D.L. under the supervision of R.J. and D.B., anatomic annotations of the strains were performed by R.H.-N. and R.V. under the supervision of D.G.M. The chronogram concept was conceived by W.A.M. and implemented by D.D., N.B. and C.A.H. D.D. generated the Gateway promoter::GFP constructs with the help of J.R., and performed the profiling experiments with the technical support of R.P. Computational analyses were performed by N.B., C.A.H., K.V., A.-R.C., A.C. and M.T. under the supervision of D.D., F.P.R., C.L., A.-L.B. and M.V. Lab support was provided by J.R., N.S. and A.B. The manuscript was written by D.D., N.B., C.A.H., A.-L.B. and M.V. The project was conceived and codirected by D.B. and M.V.
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Supplementary information
Supplementary Fig. 1
Repartition of the transgenic worm strains by origin, grouped by common locus. (PDF 242 kb)
Supplementary Fig. 2
High PCC value between the chronograms correlates with a strong visual resemblance between the fluorescent micrographs of the corresponding animals. (PDF 8567 kb)
Supplementary Fig. 3
Subtrees enrichments. s. (PDF 10891 kb)
Supplementary Fig. 4
Strains BC11521 and BC11545 showed clear expression in the vulval region and the spermatheca, respectively, that was not reported in the initial assessment. (PDF 3070 kb)
Supplementary Table 1
Average images of chronograms grouped in the neighbor joining tree branches that present enrichments in specific GO terms, microarray expression cluster and/or anatomical annotation. (PDF 21900 kb)
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Dupuy, D., Bertin, N., Hidalgo, C. et al. Genome-scale analysis of in vivo spatiotemporal promoter activity in Caenorhabditis elegans. Nat Biotechnol 25, 663–668 (2007). https://doi.org/10.1038/nbt1305
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DOI: https://doi.org/10.1038/nbt1305
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