Identification of chromatin states during zebrafish gastrulation using CUT&RUN and CUT&Tag.

Developmental Dynamics : an Official Publication of the American Association of Anatomists
Bagdeser Akdogan-OzdilekMary G Goll

Abstract

Cell fate decisions are governed by interactions between sequence-specific transcription factors and a dynamic chromatin landscape. Zebrafish offer a powerful system for probing the mechanisms that drive these cell fate choices, especially in the context of early embryogenesis. However, technical challenges associated with conventional methods for chromatin profiling have slowed progress toward understanding the exact relationships between chromatin changes, transcription factor binding, and cellular differentiation during zebrafish embryogenesis. To overcome these challenges, we adapted the chromatin profiling methods Cleavage Under Targets and Release Using Nuclease (CUT&RUN) and CUT&Tag for use in zebrafish and applied these methods to generate high-resolution enrichment maps for H3K4me3, H3K27me3, H3K9me3, RNA polymerase II, and the histone variant H2A.Z using tissue isolated from whole, mid-gastrula stage embryos. Using this data, we identify a subset of genes that may be bivalently regulated during both zebrafish and mouse gastrulation, provide evidence for an evolving H2A.Z landscape during embryo development, and demonstrate the effectiveness of CUT&RUN for detecting H3K9me3 enrichment at repetitive sequences. Our resul...Continue Reading

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