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Related Concept Videos

Gastrulation01:56

Gastrulation

Gastrulation establishes the three primary tissues of an embryo: the ectoderm, mesoderm, and endoderm. This developmental process relies on a series of intricate cellular movements, which in humans transforms a flat, “bilaminar disc” composed of two cell sheets into a three-tiered structure. In the resulting embryo, the endoderm serves as the bottom layer, and stacked directly above it is the intermediate mesoderm, and then the uppermost ectoderm. Respectively, these tissue strata will form...

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ULI-ssDRIP-seq revealed R-loop dynamics during vertebrate early embryogenesis.

Wei Xu1,2, Xin Liu1,3, Jinjin Li2

  • 1School of Life Sciences, Tsinghua University, Beijing, 100084, China.

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|July 8, 2024
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Summary

Researchers mapped R-loops (RNA:DNA hybrids) in zebrafish embryos using a new ultra-low input method. Altering R-loop levels disrupted embryonic development, highlighting their crucial role.

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EmbryogenesisEmbryonic developmentNext generation sequencingR-loopZygotic genome activation

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Area of Science:

  • Molecular Biology
  • Developmental Biology
  • Genetics

Background:

  • R-loops, structures of RNA:DNA hybrids, have diverse biological roles.
  • Understanding R-loop dynamics during embryogenesis is limited by technical challenges.
  • Previous methods required large cell numbers, hindering early developmental studies.

Purpose of the Study:

  • To develop a high-resolution, ultra-low input method for mapping R-loops.
  • To investigate R-loop dynamics throughout early zebrafish development.
  • To explore the functional implications of R-loops in embryogenesis.

Main Methods:

  • Development of ULI-ssDRIP-seq (ultra-low input single-stranded DNA R-loop immunoprecipitation sequencing).
  • Application of ULI-ssDRIP-seq to zebrafish gametes and early embryos.
  • Manipulation of R-loop levels via RNase H1 knockdown or overexpression.

Main Results:

  • ULI-ssDRIP-seq successfully mapped R-loops from minimal cell inputs (as few as 1000 cells).
  • Revealed dynamic R-loop landscapes in zebrafish, with specific enrichment in maternal rDNA and mitochondrial DNA in oocytes.
  • Perturbations in R-loop levels (via RNase H1 manipulation) led to developmental delays and altered gene expression.

Conclusions:

  • ULI-ssDRIP-seq provides unprecedented resolution for studying R-loop dynamics in limited cell populations.
  • R-loops play a significant role in early vertebrate embryonic development.
  • Findings establish a foundation for further research into R-loop functions in developmental processes.