Abstract
Transcription factors are regulatory proteins that bind to specific sites of chromosomal DNA to enact responses to intracellular and extracellular stimuli. Transcription factor signalling networks are branched and interconnected so that any single transcription factor can activate many different genes and one gene can be activated by a combination of different transcription factors. Thus, trying to characterize a cellular response to a stimulus by measuring the level of only one transcription factor potentially ignores important simultaneous events that contribute to the response. Hence, parallel measurements of transcription factors are necessary to capture the breadth of valuable information about cellular responses that would not be obtained by measuring only a single transcription factor. We have sought to develop a new, scalable, flexible, and sensitive approach to analysis of transcription factor levels that complements existing parallel approaches. Here, we describe proof-of-principle analyses of purified human transcription factors and breast cancer nuclear extracts. Our assay can successfully quantify transcription factors in parallel with ∼10-fold better sensitivity than current techniques. Sensitivity of the assay can be further increased by 200-fold through the use of PCR for signal amplification.
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Acknowledgments
We thank all the members of the Cellular and Biomolecular Laboratory (http://www.egr.msu.edu/cbl/) for their advice and support. Financial support for this work was provided in part by Michigan State University, the National Science Foundation (CBET 0941055), the National Institutes of Health (GM079688, RR024439, GM089866, DK081768, DK088251), the Michigan Universities Commercialization Initiative (MUCI), and the Center for Systems Biology.
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Bilgin, B., Liu, L., Chan, C. et al. Quantitative, solution-phase profiling of multiple transcription factors in parallel. Anal Bioanal Chem 405, 2461–2468 (2013). https://doi.org/10.1007/s00216-013-6712-9
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DOI: https://doi.org/10.1007/s00216-013-6712-9