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The Journal of Neuroscience, January 1, 1999, 19(1):72-84
The cat-1 Gene of Caenorhabditis elegans
Encodes a Vesicular Monoamine Transporter Required for Specific
Monoamine-Dependent Behaviors
Janet S.
Duerr1,
Dennis
L.
Frisby1,
Jennifer
Gaskin1,
Angie
Duke1,
Karen
Asermely2,
David
Huddleston2,
Lee E.
Eiden2, and
James B.
Rand1
1 Program in Molecular and Cell Biology, Oklahoma
Medical Research Foundation, Oklahoma City, Oklahoma 73104, and
2 Section on Molecular Neuroscience, Laboratory of Cellular
and Molecular Regulation, National Institute of Mental Health, National
Institutes of Health, Bethesda, Maryland 20892
We have identified the Caenorhabditis elegans
homolog of the mammalian vesicular monoamine transporters (VMATs); it
is 47% identical to human VMAT1 and 49% identical to human VMAT2.
C. elegans VMAT is associated with synaptic vesicles in
~25 neurons, including all of the cells reported to contain dopamine
and serotonin, plus a few others. When C. elegans VMAT
is expressed in mammalian cells, it has serotonin and dopamine
transport activity; norepinephrine, tyramine, octopamine, and histamine
also have high affinity for the transporter. The pharmacological
profile of C. elegans VMAT is closer to mammalian VMAT2
than VMAT1. The C. elegans VMAT gene is
cat-1; cat-1 knock-outs are totally
deficient for VMAT immunostaining and for dopamine-mediated sensory
behaviors, yet they are viable and grow relatively well. The
cat-1 mutant phenotypes can be rescued by C.
elegans VMAT constructs and also (at least partially) by human
VMAT1 or VMAT2 transgenes. It therefore appears that the function of
amine neurotransmitters can be completely dependent on their loading
into synaptic vesicles.
Key words:
C. elegans; VMAT; vesicular transporter; cat-1; dopamine transport; serotonin transport
Copyright © 1999 Society for Neuroscience 0270-6474/99/19172-13$05.00/0
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