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Stochastic yet biased expression of multiple Dscam splice variants by individual cells

Abstract

The Drosophila melanogaster gene Dscam is essential for axon guidance and has 38,016 possible alternative splice forms. This diversity can potentially be used to distinguish cells. We analyzed the Dscam mRNA isoforms expressed by different cell types and individual cells. The choice of splice variants expressed is regulated both spatially and temporally. Different subtypes of photoreceptors express broad yet distinctive spectra of Dscam isoforms. Single-cell RT-PCR documented that individual cells express several different Dscam isoforms and allowed an estimation of the diversity that is present. For example, we estimate that each R3/R4 photoreceptor cell expresses 14–50 distinct mRNAs chosen from the spectrum of thousands of splice variants distinctive of its cell type. Thus, the Dscam repertoire of each cell is different from those of its neighbors, providing a potential mechanism for generating unique cell identity in the nervous system and elsewhere.

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Figure 1: Developmental regulation of alternative splicing.
Figure 2: A large number of different Dscam isoforms is expressed by homogeneous cell populations.
Figure 3: Independent confirmation of microarray results using restriction endonuclease analyses of cloned cDNAs.
Figure 4: Dscam expression in hemocytes and several clonally derived S2 cell lines.
Figure 5: Single cells express multiple Dscam isoforms.
Figure 6: Single photoreceptors from the same class express different Dscam repertoires.

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Acknowledgements

We thank members of the laboratories of A.C. and P. Garrity for suggestions and discussion during the course of this work, T. Volkert for help in the design and printing of microarrays at the Center for Microarray Technology at the Whitehead Institute, B. Chazaro and J. Love for help with hybridizations and scanning, N. Watson for help with confocal microscopy at the W. M. Keck microscopy facility at the Whitehead Institute, G. Paradis for help with FACS experiments, The Bloomington Stock Center and P. Garrity laboratory for providing D. melanogaster stocks, several laboratories for providing the different cell lines (S2 from T. Orr-Weaver and I. Rebay, Kc from S. Bell, Mbn-2 from D. Hultmart), T. DiCesare for help with figure preparation and P. Garrity and S.L. Zipursky for critical reading of the manuscript and for sharing data before publication.

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Correspondence to Andrew Chess.

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Neves, G., Zucker, J., Daly, M. et al. Stochastic yet biased expression of multiple Dscam splice variants by individual cells. Nat Genet 36, 240–246 (2004). https://doi.org/10.1038/ng1299

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