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The Journal of Neuroscience, September 15, 1999, 19(18):7711-7720
Neuronal Expression of Neural Nitric Oxide Synthase (nNOS)
Protein Is Suppressed by an Antisense RNA Transcribed from an NOS
Pseudogene
Sergei A.
Korneev,
Ji-Ho
Park, and
Michael
O'Shea
Sussex Centre for Neuroscience, School of Biological Sciences,
University of Sussex, Brighton, East Sussex, BN1 9QG, United
Kingdom
Here, we show that a nitric oxide synthase (NOS) pseudogene is
expressed in the CNS of the snail Lymnaea stagnalis. The
pseudo-NOS transcript includes a region of significant antisense
homology to a previously reported neuronal NOS (nNOS)-encoding mRNA.
This suggested that the pseudo-NOS transcript acts as a natural
antisense regulator of nNOS protein synthesis. In support of this, we
show that both the nNOS-encoding and the pseudo-NOS transcripts are coexpressed in giant identified neurons (the cerebral giant cells) in
the cerebral ganglion. Moreover, reverse transcription-PCR experiments
on RNA isolated from the CNS establish that stable RNA-RNA duplex
molecules do form between the two transcripts in vivo.
Using an in vitro translation assay, we further
demonstrate that the antisense region of the pseudogene transcript
prevents the translation of nNOS protein from the nNOS-encoding mRNA.
By analyzing NOS RNA and nNOS protein expression in two different identified neurons, we find that when both the nNOS-encoding and the
pseudo-NOS transcripts are present in the same neuron, nNOS enzyme
activity is substantially suppressed. Importantly, these results show
that a natural antisense mechanism can mediate the translational
control of nNOS expression in the Lymnaea CNS. Our findings also suggest that transcribed pseudogenes are not entirely without purpose and are a potential source of a new class of regulatory gene in the nervous system.
Key words:
nNOS; antisense; pseudogene; translational regulation; dsRNA; RNA interface
Copyright © 1999 Society for Neuroscience 0270-6474/99/19187711-10$05.00/0
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