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Updated: Jan 3, 2026
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Genome-wide Snapshot of Chromatin Regulators and States in Xenopus Embryos by ChIP-Seq
Published on: February 26, 2015
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H3.3 impedes zygotic transcriptional program activated by Dux
Qing Tian1, Xiao-Fei Wang1, Shi-Ming Xie1
1Institute of Reproductive Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China.
Biochemical and Biophysical Research Communications
|November 27, 2019
Summary
Histone variant H3.3 is crucial for regulating embryonic genome activation (ZGA) in mice. Its deficiency boosts ZGA gene expression, impacting totipotency establishment during early development.
Area of Science:
- Developmental Biology
- Epigenetics
- Genomics
Background:
- Fertilization initiates totipotency and embryonic genome activation (ZGA/EGA).
- Mouse embryonic stem cells (mESCs) can enter a two-cell (2C)-like state with activated ZGA genes, including Dux.
- The role of histone variants in regulating ZGA is not fully understood.
Purpose of the Study:
- To investigate the role of histone variant H3.3 in regulating ZGA and totipotency.
- To determine if H3.3 acts as an upstream regulator of Dux expression.
Main Methods:
- Analysis of ZGA gene expression in mESCs with H3.3 deficiency.
- Chromatin immunoprecipitation to assess H3.3 association with the Dux locus.
- Transcriptome analysis of early mouse embryos with H3.3 knockdown.
Main Results:
- H3.3 deficiency significantly enhances ZGA gene expression in mESCs.
- H3.3 directly binds to the Dux locus, inhibiting Dux expression.
- Transcriptome data from H3.3-knockdown embryos support H3.3's role in regulating ZGA.
Conclusions:
- Histone variant H3.3 is a key negative regulator of Dux and ZGA gene expression in mESCs.
- Proper H3.3 levels are essential for orchestrating ZGA activity during early embryonic development and totipotency establishment.
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