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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns (non-coding regions of a gene) or intergenic regions (stretches of DNA present between genes). Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself, forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA...
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Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
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Influence of RNA circularity on Target RNA-Directed MicroRNA Degradation.

Federico Fuchs Wightman1,2, Jerónimo Lukin3, Sebastián A Giusti3

  • 1Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Buenos Aires 1428, Argentina.

Nucleic Acids Research
|February 21, 2024
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Summary
This summary is machine-generated.

Circular RNA (circRNA) topology significantly impacts microRNA degradation via Target RNA-Directed MicroRNA Degradation (TDMD). RNA circularity, not just sequence, determines whether circRNAs enhance or inhibit microRNA stability.

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Area of Science:

  • Molecular Biology
  • RNA Biology
  • Gene Regulation

Background:

  • Circular RNAs (circRNAs) and linear RNAs can sequester microRNAs (miRNAs).
  • Target RNA-Directed MicroRNA Degradation (TDMD) is a mechanism for miRNA destruction.
  • The role of RNA topology (circular vs. linear) in TDMD is not fully understood.

Purpose of the Study:

  • To investigate if the circular or linear topology of RNA targets affects TDMD efficiency.
  • To determine if sequence or structure dictates TDMD activity.
  • To explore the influence of circRNAs on miRNA stability in a biological system.

Main Methods:

  • Studied endogenous and artificial RNA targets with varying topologies.
  • Manipulated expression levels of circRNAs and their linear counterparts.
  • Analyzed miRNA abundance and stability using RNA sequencing in a neuron differentiation model.

Main Results:

  • Depletion of the circRNA Cdr1as (ciRS-7) reduced miR-7 abundance, confirming its protective role.
  • Overexpression of a linear version of Cdr1as induced miR-7 degradation, highlighting topology's importance.
  • Differential TDMD effects were observed between circular and linear forms of the same sequence, independent of nucleotide sequence alone.

Conclusions:

  • RNA circularity is a critical factor influencing TDMD.
  • The topological form of an RNA transcript dictates its ability to enhance or inhibit specific microRNA degradation.
  • CircRNAs can modulate miRNA stability through mechanisms beyond simple sponging.