The maternal to zygotic transition regulates genome-wide heterochromatin establishment in the zebrafish embryo

Kathrin Laue, Srivarsha Rajshekar, Abigail J. Courtney, Zachary A. Lewis and Mary G. Goll ()
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Kathrin Laue: University of Georgia
Srivarsha Rajshekar: University of Georgia
Abigail J. Courtney: University of Georgia
Zachary A. Lewis: University of Georgia
Mary G. Goll: Memorial Sloan Kettering Cancer Center

Nature Communications, 2019, vol. 10, issue 1, 1-10

Abstract: Abstract The segregation of eukaryotic genomes into euchromatin and heterochromatin represents a fundamental and poorly understood process. Here, we demonstrate that genome-wide establishment of heterochromatin is triggered by the maternal to zygotic transition (MZT) during zebrafish embryogenesis. We find that prior to MZT, zebrafish lack hallmarks of heterochromatin including histone H3 lysine 9 trimethylation (H3K9me3) and condensed chromatin ultrastructure. Global establishment of heterochromatic features occurs following MZT and requires both activation of the zygotic genome and degradation of maternally deposited RNA. Mechanistically, we demonstrate that zygotic transcription of the micro RNA miR-430 promotes degradation of maternal RNA encoding the chromatin remodeling protein Smarca2, and that clearance of Smarca2 is required for global heterochromatin establishment in the early embryo. Our results identify MZT as a key developmental regulator of heterochromatin establishment during vertebrate embryogenesis and uncover functions for Smarca2 in protecting the embryonic genome against heterochromatinization.

Date: 2019
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-09582-3

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DOI: 10.1038/s41467-019-09582-3

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