title: Precision of Readout at the hunchback Gene: Analyzing Short Transcription Time Traces in Living Fly Embryos.
abstract: The simultaneous expression of the hunchback gene in the numerous nuclei of the developing fly embryo gives us a unique opportunity to study how transcription is regulated in living organisms. A recently developed MS2-MCP technique for imaging nascent messenger RNA in living Drosophila embryos allows us to quantify the dynamics of the developmental transcription process. The initial measurement of the morphogens by the hunchback promoter takes place during very short cell cycles, not only giving each nucleus little time for a precise readout, but also resulting in short time traces of transcription. Additionally, the relationship between the measured signal and the promoter state depends on the molecular design of the reporting probe. We develop an analysis approach based on tailor made autocorrelation functions that overcomes the short trace problems and quantifies the dynamics of transcription initiation. Based on live imaging data, we identify signatures of bursty transcription initiation from the hunchback promoter. We show that the precision of the expression of the hunchback gene to measure its position along the anterior-posterior axis is low both at the boundary and in the anterior even at cycle 13, suggesting additional post-transcriptional averaging mechanisms to provide the precision observed in fixed embryos.
authors.affiliation: Ecole Normale Superieure, PSL Research University, Paris, France.|Sorbonne Universités, UPMC Univ Paris 06, Paris, France.|UMR3664/UMR168/UMR8549, CNRS, Paris, France.
authors.forename: Jonathan
authors.identifier: 0000-0001-7112-3217
authors.initials: J
authors.lastname: Desponds
authors.affiliation: Ecole Normale Superieure, PSL Research University, Paris, France.|Sorbonne Universités, UPMC Univ Paris 06, Paris, France.|UMR3664/UMR168/UMR8549, CNRS, Paris, France.
authors.forename: Huy
authors.initials: H
authors.lastname: Tran
authors.affiliation: Ecole Normale Superieure, PSL Research University, Paris, France.|Sorbonne Universités, UPMC Univ Paris 06, Paris, France.|UMR3664/UMR168/UMR8549, CNRS, Paris, France.
authors.forename: Teresa
authors.initials: T
authors.lastname: Ferraro
authors.affiliation: Sorbonne Universités, UPMC Univ Paris 06, Paris, France.|UMR3664/UMR168/UMR8549, CNRS, Paris, France.|Institut Curie, PSL Research University, Paris, France.
authors.forename: Tanguy
authors.initials: T
authors.lastname: Lucas
authors.affiliation: McMaster University, Hamilton, Ontario, Canada.
authors.forename: Carmina
authors.identifier: 0000-0003-1696-4368
authors.initials: C
authors.lastname: Perez Romero
authors.affiliation: Sorbonne Universités, UPMC Univ Paris 06, Paris, France.|UMR3664/UMR168/UMR8549, CNRS, Paris, France.|Institut Curie, PSL Research University, Paris, France.
authors.forename: Aurelien
authors.initials: A
authors.lastname: Guillou
authors.affiliation: McMaster University, Hamilton, Ontario, Canada.
authors.forename: Cecile
authors.identifier: 0000-0001-8329-4953
authors.initials: C
authors.lastname: Fradin
authors.affiliation: Sorbonne Universités, UPMC Univ Paris 06, Paris, France.|UMR3664/UMR168/UMR8549, CNRS, Paris, France.|Institut Curie, PSL Research University, Paris, France.
authors.forename: Mathieu
authors.initials: M
authors.lastname: Coppey
authors.affiliation: Sorbonne Universités, UPMC Univ Paris 06, Paris, France.|UMR3664/UMR168/UMR8549, CNRS, Paris, France.|Institut Curie, PSL Research University, Paris, France.
authors.forename: Nathalie
authors.initials: N
authors.lastname: Dostatni
authors.affiliation: Ecole Normale Superieure, PSL Research University, Paris, France.|Sorbonne Universités, UPMC Univ Paris 06, Paris, France.|UMR3664/UMR168/UMR8549, CNRS, Paris, France.
authors.forename: Aleksandra M
authors.identifier: 0000-0002-2686-5702
authors.initials: AM
authors.lastname: Walczak
mesh_terms: D000818:Animals; D002453:Cell Cycle / Q000235:genetics; D019295:Computational Biology; D004268:DNA-Binding Proteins / Q000235:genetics* / Q000378:metabolism; D004330:Drosophila / Q000235:genetics*; D029721:Drosophila Proteins / Q000235:genetics* / Q000378:metabolism; D004625:Embryo, Nonmammalian; D047108:Embryonic Development / Q000235:genetics; D008957:Models, Genetic; D013997:Time Factors; D014157:Transcription Factors / Q000235:genetics* / Q000378:metabolism; D014158:Transcription, Genetic / Q000235:genetics*
chemical_list: D004268:DNA-Binding Proteins; D029721:Drosophila Proteins; D014157:Transcription Factors; C061245:hb protein, Drosophila