Defective SLC6A2 does not cotransport NAd, Na+ from extracellular region to cytosol

Stable Identifier
Reaction [transition]
Homo sapiens
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SLC6A2 encodes the sodium-dependent noradrenaline transporter NAT1 which terminates the action of the neurotransmitter noradrenaline (NAd) by transporting it from the synapse back to its vesicles for storage and reuse. SLC6A2 is expressed in the CNS and adrenal glands. Defects in SLC6A2 can cause orthostatic intolerance (OI; MIM:604715), a syndrome characterised by lightheadedness, fatigue and development of symptoms during upright standing, relieved by sitting back down again. Plasma NAd concentration is abnormally high. The loss-of-function A457P mutation in SLC6A2 can lead to OI. NAd is not transported back to vesciles for storage and builds up in the bloodstream (Shannon et al. 2000, Paczkowski et al. 2002).

Literature References
PubMed ID Title Journal Year
11875370 Pharmacological properties of the naturally occurring Ala(457)Pro variant of the human norepinephrine transporter

Paczkowski, FA, Bryan-Lluka, LJ, Bönisch, H

Pharmacogenetics 2002
10684912 Orthostatic intolerance and tachycardia associated with norepinephrine-transporter deficiency

Shannon, JR, Jordan, J, Robertson, D, Blakely, RD, Biaggioni, I, Black, BK, Flattem, NL, Jacob, G

N Engl J Med 2000
Catalyst Activity

norepinephrine:sodium symporter activity of SLC6A2 A457P [plasma membrane]

Normal reaction
Functional status

Loss of function of SLC6A2 A457P [plasma membrane]

Name Identifier Synonyms
amino acid metabolic disorder DOID:9252 inborn errors of amino acid metabolism
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