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RNA Editing

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RNA editing is a post-transcriptional modification where a precursor mRNA (pre-mRNA) nucleotide sequence is changed by base insertion, deletion, or modification. The extent of RNA editing varies from a few hundred bases, in mitochondrial DNA of trypanosomes, to a just single base, in nuclear genes of mammals. Even a single base change in the pre-mRNA can convert a codon for one amino acid into the codon for another amino acid or a stop codon. This type of re-coding can significantly affect the...

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Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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Inhibitory Synapse Formation in a Co-culture Model Incorporating GABAergic Medium Spiny Neurons and HEK293 Cells Stably Expressing GABAA Receptors

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Developmental modulation of GABA(A) receptor function by RNA editing.

Elizabeth Y Rula¹, Andre H Lagrange, Michelle M Jacobs

¹Department of Pharmacology, Vanderbilt University, Nashville, Tennessee 37232, USA.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience

|June 14, 2008

Summary

Adenosine-to-inosine (A-to-I) RNA editing modifies GABA(A) receptors, impacting neuronal excitability. This study reveals how A-to-I editing of alpha3 subunits regulates receptor function during brain development.

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Area of Science:

Neuroscience
Molecular Biology
Genetics

Background:

Adenosine-to-inosine (A-to-I) RNA editing is a crucial mechanism for modulating protein function, particularly in the nervous system.
Heteromeric GABA(A) receptors play vital roles in neuronal excitability and development.

Purpose of the Study:

To investigate the A-to-I editing of transcripts encoding the alpha3 subunit of GABA(A) receptors (Gabra3).
To characterize the spatiotemporal regulation and functional consequences of this editing event on neuronal function.

Main Methods:

Analysis of Gabra3 transcript editing in different brain regions and developmental stages of mice.
Electrophysiological recordings of GABA(A) receptors expressed in transfected cells.

Main Results:

A specific A-to-I editing event (isoleucine to methionine) was identified in the third transmembrane domain of the alpha3 subunit.
Editing levels varied spatiotemporally, being high in adult brains but low during early development.
Edited and non-edited receptors exhibited distinct kinetic and current-voltage properties, influencing chloride ion flux.

Conclusions:

The editing of alpha3 subunits is dynamically regulated during brain development, influencing GABAergic signaling.
Non-edited alpha3 subunits may promote excitatory responses essential for synapse formation, while also acting as a brake to prevent excessive excitation.
This editing provides a mechanism for fine-tuning neuronal excitability crucial for normal brain development.