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Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
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Riboswitches are RNA elements that regulate gene expression by altering their secondary structures in response to specific effector molecules. These elements, located in the leader regions of certain mRNAs, act as transcriptional regulators by toggling between alternative conformations to control downstream gene expression. Riboswitch-mediated regulation is a precise mechanism for modulating biosynthetic pathways, as exemplified by the riboflavin biosynthesis pathway in Bacillus...
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Related Experiment Video

Updated: Jan 13, 2026

Defining the Program of Maternal mRNA Translation during In vitro Maturation using a Single Oocyte Reporter Assay
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R-loops orchestrate RNAPII transcriptional reprogramming for the maternal-to-zygotic transition.

Yaoyi Li1,2, Qing Li3,4, Xinxiu Wang3,4

  • 1State Key Laboratory of Respiratory Disease, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China.

Cell Research
|January 8, 2026
PubMed
Summary
This summary is machine-generated.

CG-poor R-loops are crucial for early mammalian development and the maternal-to-zygotic transition. Their loss disrupts gene regulation by affecting RNA polymerase II pause release, impacting embryonic development.

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Area of Science:

  • Genomics
  • Epigenetics
  • Developmental Biology

Background:

  • R-loops are genomic structures linking epigenetic modification and transcriptional regulation.
  • The role of R-loops in mammalian preimplantation development is largely unknown.

Purpose of the Study:

  • To investigate the functional roles and regulatory mechanisms of R-loops during mammalian preimplantation development.
  • To understand how R-loops influence the maternal-to-zygotic transition and zygotic genome activation.

Main Methods:

  • Analysis of R-loop reprogramming across developmental stages, correlating with CG density.
  • Investigating the impact of CG-poor R-loop loss on preimplantation embryo development and gene activation.
  • Examining the molecular mechanism involving DDX21 helicase, 7SK/HEXIM1 snRNP, CDK9, and RNA polymerase II (RNAPII) phosphorylation.

Main Results:

  • R-loop reprogramming is CG density-dependent, with CG-poor R-loops being stage-specific and vital for early development.
  • Loss of CG-poor R-loops causes severe defects in maternal-to-zygotic transition and preimplantation development.
  • Abnormal CG-poor R-loops lead to premature activation of zygotic genome activation (ZGA) genes by inhibiting DDX21, restricting CDK9 release, and affecting RNAPII S2p.

Conclusions:

  • R-loops directly modulate RNA polymerase II pause release, ensuring temporal gene expression fidelity during the maternal-to-zygotic transition.
  • CG-poor R-loops are critical regulators of gene expression timing essential for successful mammalian embryonic development.