Cell system for following and quantifying single-gene transcription in fixed and living cells. Cell system for following and quantifying single-gene transcription.

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Cell system for following and quantifying single-gene transcription in fixed and living cells. Cell system for following and quantifying single-gene transcription in fixed and living cells. (A) The cyclin D1 genes used in the study were stably transfected as single-copy genes into HEK293 cells using the Flp-In approach (Yunger et al., 2010, 2013). One gene is under the control of the CCND1 promoter and the other version is regulated by the CMV promoter. The coding region contains an HA tag and is followed by 24× MS2 sequence repeats and the 3′-UTR of CCND1. The MS2 repeats form secondary structures that can be bound by MS2-CP-GFP (green stars) for tracking transcription in living cells. (B) A transcribing CCND1-MS2 gene under the control of the CMV promoter tagged with MS2-CP-GFP. Arrow points to the site of transcription and bright green dots are single CCND1 messenger RNPs (mRNPs). Hoechst DNA stain is in blue. (C) RNA FISH with a Cy3-labeled probe that hybridizes with the MS2 region of the mRNA. Arrow points to the site of transcription and red dots are single CCND1 mRNAs. (D) An MS2-CP-GFP–expressing cell showing two adjacent CCND1 alleles (arrows). Scale bar, 5 μm. Sharon Yunger et al. LSA 2018;1:e201800086 © 2018 Yunger et al.