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pre-mRNA Processing

pre-mRNA Processing

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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Related Experiment Video

Updated: Jul 28, 2025

A Procedure for Implanting Organized Arrays of Microwires for Single-unit Recordings in Awake, Behaving Animals

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Noncanonical processing by animal Microprocessor.

Thuy Linh Nguyen¹, Trung Duc Nguyen¹, Minh Khoa Ngo¹

¹Division of Life Science, The Hong Kong University of Science & Technology, Hong Kong, China.

|June 2, 2023

Summary

This summary is machine-generated.

Researchers discovered a new way Microprocessor (MP) processes microRNA (miRNA) transcripts. This noncanonical mechanism uses novel DROSHA dsRNA recognition sites (DRESs) and expands understanding of miRNA biogenesis.

Keywords:

C. elegans DGCR8 DRES DROSHA DROSHA recognition sites Microprocessor canonical pri-miRNA processing miRNAs noncanonical pri-miRNA processing pri-miRNAs

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Area of Science:

Molecular Biology
Genetics
Biochemistry

Background:

Microprocessor (MP), comprising DROSHA-DGCR8, is crucial for initiating miRNA biogenesis by processing pri-miRNAs.
The established canonical cleavage mechanism of MP has been studied for 20 years.
This canonical pathway, however, fails to explain the processing of all pri-miRNAs in animals.

Purpose of the Study:

To discover and characterize alternative mechanisms of pri-miRNA processing by MP.
To investigate the role of novel RNA-protein interactions in miRNA biogenesis.
To determine the evolutionary conservation and functional significance of alternative MP cleavage pathways.

Main Methods:

High-throughput pri-miRNA cleavage assays were performed on approximately 260,000 sequences.
Comparative analysis of canonical versus noncanonical cleavage requirements.
In silico identification and validation of DROSHA dsRNA recognition sites (DRESs).

Main Results:

A novel, noncanonical MP cleavage mechanism was identified and characterized.
This noncanonical pathway does not require key elements of the canonical mechanism.
It relies on previously unrecognized DROSHA dsRNA recognition sites (DRESs).
The noncanonical mechanism is conserved across animal species, notably important in C. elegans.

Conclusions:

The noncanonical MP cleavage mechanism accounts for processing of pri-miRNA substrates missed by the canonical pathway.
This finding broadens the known substrate range for animal MPs.
It suggests an expanded regulatory network for miRNA biogenesis.