In anamniote embryos, the major wave of zygotic genome activation starts during the mid-blastula transition. However, some genes escape global genome repression, are activated substantially earlier, and contribute to the minor wave of genome activation. The mechanisms underlying the minor wave of genome activation are little understood. We explored the genomic organization and cis -regulatory mechanisms of a transcrip-tion body, in which the minor wave of genome activation is first detected in zebrafish. We identified the miR-430 cluster as having excessive copy number and the highest density of Pol-II-transcribed promoters in the genome, and this is required for forming the transcription body. However, this transcription body is not essential for, nor does it encompasse, minor wave transcription globally. Instead, distinct minor-wave -specific promoter architecture suggests that promoter-autonomous mechanisms regulate the minor wave of genome activation. The minor-wave-specific features also suggest distinct transcription initiation mecha-nisms between the minor and major waves of genome activation.

The miR-430 locus with extreme promoter density forms a transcription body during the minor wave of zygotic genome activation / Hadzhiev, Yavor; Wheatley, Lucy; Cooper, Ledean; Ansaloni, Federico; Whalley, Celina; Chen, Zhelin; Finaurini, Sara; Gustincich, Stefano; Sanges, Remo; Burgess, Shawn; Beggs, Andrew; Müller, Ferenc. - In: DEVELOPMENTAL CELL. - ISSN 1534-5807. - 58:2(2023), pp. 155-170. [10.1016/j.devcel.2022.12.007]

The miR-430 locus with extreme promoter density forms a transcription body during the minor wave of zygotic genome activation

Ansaloni, Federico;Finaurini, Sara;Gustincich, Stefano;Sanges, Remo;
2023-01-01

Abstract

In anamniote embryos, the major wave of zygotic genome activation starts during the mid-blastula transition. However, some genes escape global genome repression, are activated substantially earlier, and contribute to the minor wave of genome activation. The mechanisms underlying the minor wave of genome activation are little understood. We explored the genomic organization and cis -regulatory mechanisms of a transcrip-tion body, in which the minor wave of genome activation is first detected in zebrafish. We identified the miR-430 cluster as having excessive copy number and the highest density of Pol-II-transcribed promoters in the genome, and this is required for forming the transcription body. However, this transcription body is not essential for, nor does it encompasse, minor wave transcription globally. Instead, distinct minor-wave -specific promoter architecture suggests that promoter-autonomous mechanisms regulate the minor wave of genome activation. The minor-wave-specific features also suggest distinct transcription initiation mecha-nisms between the minor and major waves of genome activation.
2023
58
2
155
170
10.1016/j.devcel.2022.12.007
https://pubmed.ncbi.nlm.nih.gov/36693321/
Hadzhiev, Yavor; Wheatley, Lucy; Cooper, Ledean; Ansaloni, Federico; Whalley, Celina; Chen, Zhelin; Finaurini, Sara; Gustincich, Stefano; Sanges, Remo; Burgess, Shawn; Beggs, Andrew; Müller, Ferenc
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11767/132131
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