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R-loop Mapping and Characterization During Drosophila Embryogenesis Reveals Developmental Plasticity in R-loop
Alexander Munden1, Mary Lauren Benton2, John A Capra3
1Department of Biological Sciences, Vanderbilt University, Nashville, TN 37212, USA.
Journal of Molecular Biology
|May 24, 2022
Summary
R-loops, crucial for DNA processes, dynamically change during Drosophila development. Their abundance and location are regulated, with RNaseH1 activity essential for embryonic survival and genome stability.
Area of Science:
- Molecular Biology
- Developmental Biology
- Genomics
Background:
- R-loops are nucleic acid structures implicated in transcription, DNA replication, and genome stability.
- The dynamic regulation of R-loops during metazoan embryogenesis remains largely unexplored.
- Drosophila embryogenesis offers a tractable model to study R-loop dynamics due to its defined developmental stages and available genomic data.
Purpose of the Study:
- To investigate the developmental regulation of R-loop abundance and genome-wide localization during Drosophila embryogenesis.
- To determine the role of RNaseH1 activity in embryonic development concerning R-loops.
- To identify genomic and epigenomic factors associated with R-loop formation across developmental stages.
Main Methods:
- Strand-specific DRIP-seq (DNA-RNA immunoprecipitation sequencing) was employed to map R-loops genome-wide.
- R-loop abundance was quantified in early and late-stage embryos and compared to cultured cells.
- Correlation analyses were performed between R-loop localization and genomic features (GC skew, AT skew) and chromatin modifications (H3K27me3).
Main Results:
- Absolute R-loop levels significantly change during Drosophila embryogenesis.
- RNaseH1 catalytic activity is essential for embryonic development, indicating a critical role for R-loop resolution.
- R-loop localization is plastic throughout development, varying in gene association and position relative to gene bodies, independent of transcriptional changes.
- Negative GC skew and altered AT skew correlate with R-loop formation.
- Specific chromatin binding proteins and histone modifications associate with R-loops developmentally, with some showing stage-specific interactions.
Conclusions:
- R-loop abundance and genome-wide localization are actively regulated during Drosophila embryogenesis.
- The developmental plasticity of R-loops is crucial for embryonic development, highlighting their dynamic role beyond basic cellular functions.
- Understanding R-loop dynamics provides insights into genome regulation and stability during development.
