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Increased A-to-I RNA editing of the transcript for GABAA receptor subunit α3 during chick retinal development

Published online by Cambridge University Press:  16 September 2010

HENRIK RING ,
HENRIK BOIJE ,
CHAMMIRAN DANIEL ,
JOHAN OHLSON ,
MARIE ÖHMAN  and
FINN HALLBÖÖK
HENRIK RING
Affiliation:
Department of Neuroscience, Biomedical Center, Uppsala University, Uppsala, Sweden
HENRIK BOIJE
Affiliation:
Department of Neuroscience, Biomedical Center, Uppsala University, Uppsala, Sweden
CHAMMIRAN DANIEL
Affiliation:
Department of Molecular Biology & Functional Genomics, Stockholm University, Stockholm, Sweden
JOHAN OHLSON
Affiliation:
Department of Molecular Biology & Functional Genomics, Stockholm University, Stockholm, Sweden
MARIE ÖHMAN
Affiliation:
Department of Molecular Biology & Functional Genomics, Stockholm University, Stockholm, Sweden
FINN HALLBÖÖK*
Affiliation:
Department of Neuroscience, Biomedical Center, Uppsala University, Uppsala, Sweden
*
†Address correspondence and reprint requests to: Finn Hallböök, Department of Neuroscience, Biomedical Center (BMC), Uppsala University, Box 593, 751 24 Uppsala, Sweden. E-mail: Finn.hallbook@neuro.uu.se
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Abstract

Adenosine-to-inosine (A-to-I) RNA editing is a cotranscriptional or posttranscriptional gene regulatory mechanism that increases the diversity of the proteome in the nervous system. Recently, the transcript for GABA type A receptor subunit α3 was found to be subjected to RNA editing. The aim of this study was to determine if editing of the chicken α3 subunit transcript occurs in the retina and if the editing is temporally regulated during development. We also raised the question if editing of the α3 transcript was temporally associated with the suggested developmental shift from excitation to inhibition in the GABA system. The editing frequency was studied by using Sanger and Pyrosequencing, and to monitor the temporal aspects, we studied the messenger RNA expression of the GABAA receptor subunits and chloride pumps, known to be involved in the switch. The results showed that the chick α3 subunit was subjected to RNA editing, and its expression was restricted to cells in the inner nuclear and ganglion cell layer in the retina. The extent of editing increased during development (after embryonic days 8–9) concomitantly with an increase of expression of the chloride pump KCC2. Expression of several GABAA receptor subunits known to mediate synaptic GABA actions was upregulated at this time. We conclude that editing of the chick GABAA subunit α3 transcript in chick retina gives rise to an amino acid change that may be of importance in the switch from excitatory to inhibitory receptors.

Keywords

Chloride ion channelGABA(A) subunitsGABA receptorKCC2mRNA expressionPosttranscriptional modification
Type
Research Articles
Information
Visual Neuroscience , Volume 27 , Issue 5-6 , November 2010 , pp. 149 - 157
Copyright
Copyright © Cambridge University Press 2010

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