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MicroRNAs

MicroRNAs

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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piRNA - Piwi-interacting RNAs

PIWI-interacting RNAs, or piRNAs, are the most abundant short non-coding RNAs. More than 20,000 genes have been found in humans that code for piRNAs while only 2000 genes have been found for miRNAs. piRNAs can act at the transcriptional and post-transcriptional levels and have a vital role in silencing transposable elements present in germ cells. They are also involved in epigenetic silencing and activation. Previously, they were thought to function only in germ cells but new evidence suggests...

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Chromatin Structure Regulates pre-mRNA Processing

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...

Master Transcription Regulators

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Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...

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Related Experiment Video

Updated: May 16, 2025

Visualization of Cell Cycle Variations and Determination of Nucleation in Postnatal Cardiomyocytes

Visualization of Cell Cycle Variations and Determination of Nucleation in Postnatal Cardiomyocytes

Published on: February 24, 2017

MicroRNA mechanisms instructing Purkinje cell specification.

Norjin Zolboot¹, Yao Xiao², Jessica X Du¹

¹Department of Neuroscience, The Scripps Research Institute, La Jolla, CA 92037, USA.

|April 3, 2025

Summary

This summary is machine-generated.

MicroRNAs (miRNAs) are essential for brain development, driving neuronal subtype specification. This study reveals crucial roles for specific miRNAs in Purkinje cell differentiation and identity.

Keywords:

AGO2 CLIP-seq Purkinje cells loss of function mapping microRNA-target network microRNAs neuronal identity post-transcriptional regulation specification

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Area of Science:

Neuroscience
Molecular Biology
Genetics

Background:

MicroRNAs (miRNAs) are vital regulators of gene expression.
Their precise roles in neuronal subtype specification during brain development are not fully understood.
Purkinje cell (PC) differentiation was previously thought to be independent of miRNA regulation.

Purpose of the Study:

To investigate the role of miRNAs in Purkinje cell (PC) differentiation and identity.
To dissect cell-type-specific miRNA-target networks with high spatiotemporal resolution.
To identify critical miRNA windows for PC development, including dendritogenesis and synaptogenesis.

Main Methods:

Engineered advanced technologies for high-resolution spatiotemporal analysis of miRNA function.
Utilized fast and reversible miRNA loss-of-function models.
Developed new mouse models for miRNA-target network mapping in rare cell types.

Main Results:

Demonstrated that miRNAs are necessary for Purkinje cell (PC) differentiation.
Identified specific temporal windows critical for PC dendritogenesis and synaptogenesis.
Uncovered PC-specific post-transcriptional programs regulated by miR-206 and its targets (Shank3, Prag1, En2, Vash1).

Conclusions:

Gene expression regulation by miRNAs is critical for neuronal subtype specification, extending beyond transcriptional control.
miR-206 and its targets play key roles in PC-specific dendritogenesis and synaptogenesis.
Post-transcriptional regulation by miRNAs is essential for establishing neuronal identity.