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Chromatin Structure Regulates pre-mRNA Processing02:41

Chromatin Structure Regulates pre-mRNA Processing

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In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
The chromatin structure, especially...
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The flow of genetic information in cells from DNA to mRNA to protein is described by the central dogma, which states that genes specify the sequence of mRNAs, which in turn specify the sequence of amino acids making up all proteins. The decoding of one molecule to another is performed by specific proteins and RNAs. Because the information stored in DNA is so central to cellular function, it makes intuitive sense that the cell would make mRNA copies of this information for protein synthesis...
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Many covalent molecules have central atoms that do not have eight electrons in their Lewis structures. These molecules fall into three categories:
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Regulated mRNA Transport

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In eukaryotes, transcription and translation are compartmentalized; an mRNA is first synthesized in the nucleus and then selectively transported to the cytoplasm for protein synthesis. Before transport, a pre-mRNA undergoes several steps of post-transcriptional modifications including splicing, 5' capping, and the addition of a poly-adenine tail. Various proteins bind to the pre-mRNA during these modifications. The mRNA transport takes place with the help of multiple proteins playing...
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pre-mRNA Processing02:01

pre-mRNA Processing

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In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a “cap” to the 5’ end of the growing transcript. In this process, a 5’ phosphate is replaced by modified guanosine that has a methyl group attached to it (7-Methyl...
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Chemical bonds are complex interactions between two or more atoms or ions, which reduce the potential energy of the molecule. Gilbert N. Lewis developed a model called the Lewis model that simplified the depiction of chemical bond formation and provided straightforward explanations for the chemical bonds seen in most common compounds.
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Related Experiment Video

Updated: Feb 11, 2026

Designing a Bio-responsive Robot from DNA Origami
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Uncovering Design and Assembly Rules for mRNA-DNA Origami.

Jack Y Wang1, Jared Huzar2, Myoungseok Kim1

  • 1Department of Electrical Engineering and Computer Sciences, University of California─Berkeley, Berkeley, California 94706, United States of America.

Nano Letters
|February 10, 2026
PubMed
Summary

Researchers developed rules for creating mRNA-DNA hybrid origami nanostructures. This breakthrough allows for the high-yield formation of stable, functional RNA-DNA structures for nanotechnology applications.

Keywords:
DNA nanotechnologyDNA origamimRNAmRNA−DNAself-assembly

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Area of Science:

  • Biotechnology
  • Nanotechnology
  • Synthetic Biology

Background:

  • mRNA-DNA hybrid origami merges RNA functionality with DNA nanostructures.
  • Robust design and assembly principles for these hybrid structures are currently lacking.

Purpose of the Study:

  • To systematically define parameters for high-yield formation of compact mRNA-DNA hybrid origami.
  • To establish generalizable design rules and a standardized synthesis protocol.

Main Methods:

  • Designed five distinct mRNA-DNA hybrid origami architectures using mRNAs for luciferase, EGFP, and mCherry.
  • Varied sizes, shapes, crossover geometries, and packing densities in the designs.
  • Utilized atomic force microscopy (AFM) for structural characterization.

Main Results:

  • Identified critical parameters: asymmetric A-form crossovers, monovalent-cation-rich buffers, and moderate-temperature annealing.
  • These conditions suppress RNA degradation and kinetic trapping while maintaining RNA-DNA helical geometry.
  • AFM confirmed monodisperse, well-folded nanostructures with nanoscale precision.

Conclusions:

  • Established generalizable design rules for mRNA-DNA hybrid origami.
  • Developed a standardized synthesis protocol for reproducible creation of these nanostructures.
  • Enables integration of RNA functionality into programmable DNA nanostructures with high fidelity.