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The Journal of Neuroscience, December 1, 1999, 19(23):10348-10356
The ETS Domain Factor Pet-1 Is an Early and Precise Marker of
Central Serotonin Neurons and Interacts with a Conserved Element in
Serotonergic Genes
Timothy
Hendricks,
Nicole
Francis,
Dmitry
Fyodorov, and
Evan S.
Deneris
Case Western Reserve University, Department of Neurosciences,
School of Medicine, Cleveland, Ohio 44106
Serotonin (5-HT) plays a crucial neuromodulatory role in numerous
physiological and behavioral functions, and dysfunction of the
serotonergic system has been implicated in several psychiatric disorders. Despite the widespread importance of the central
serotonergic neurotransmitter system, little is known about the
molecular mechanisms controlling the development of 5-HT neurons. We
previously identified an ETS domain transcription factor, Pet-1,
that is expressed in a small number of tissues, including the brain.
Here, we show that expression of Pet-1 RNA in the brain is restricted
to, and marks, the entire rostrocaudal extent of rat serotonergic
hindbrain raphe nuclei. Remarkably, Pet-1 RNA colocalizes with
tryptophan hydroxylase-positive neurons in raphe nuclei but not with
their nonserotonergic neuron or non-neuronal neighbors. Pet-1 RNA is limited to two domains in the developing hindbrain, which precedes the
appearance of 5-HT in each domain by approximately a half day.
Conserved Pet-1 binding sites are present in or near the promoter
regions of the human and mouse 5-HT1a receptor, serotonin transporter,
tryptophan hydroxylase, and aromatic L-amino acid decarboxylase genes whose expression is characteristic of the serotonergic neuron phenotype. These sites are capable of supporting transcriptional activation through interactions with the Pet-1 ETS
domain and can function as enhancers. Together, our findings establish
Pet-1 as an early and precise marker of 5-HT neurons and suggest that
it functions specifically in the differentiation and maintenance of
these neurons.
Key words:
serotonin; ETS factor; raphe nuclei; transcription; binding site; neurotransmitter phenotype
Copyright © 1999 Society for Neuroscience 0270-6474/99/192310348-09$05.00/0
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