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Comparative sequencing and association studies of aromatic L-amino acid decarboxylase in schizophrenia and bipolar disorder

Comparative sequencing and association studies of aromatic L-amino acid decarboxylase in schizophrenia and bipolar disorder
Comparative sequencing and association studies of aromatic L-amino acid decarboxylase in schizophrenia and bipolar disorder
Aromatic L-amino acid decarboxylase (AADC) is a relatively non specific enzyme involved in the biosynthesis of several classical neurotransmitters including dopamine and 5-hydroxytryptamine (5HT; serotonin). AADC does not catalyse the rate limiting step in either pathway, but is rate limiting in the synthesis of 2-phenylethylamine (2PE) which is a positive modulator of dopaminergic transmission and a candidate natural psychotogenic compound.1 We and others have proposed that polymorphism in AADC resulting in altered 2PE activity might contribute to the pathogenesis of psychosis. In order to test this hypothesis, we have used denaturing high performance liquid chromatography (DHPLC)3 to screen 3943 bases of the AADC gene and its promoter regions for variants that might affect protein structure or expression in 15 unrelated people with schizophrenia, and 15 unrelated people with bipolar disorder. Three polymorphisms were identified by DHPLC: a insertion/deletion polymorphism in the 5' UTR of the neuronal specific mRNA (g.-33-30delAGAG, bases 586-589 of GenBank M77828), a T>A variant in the non-neuronal exon 1 (g. -67T>A, GenBank M88070), and a G>A polymorphism within intron 8 (g. IVS8 +75G>A, GenBank M84598). Case-control analysis did not suggest that genetic polymorphism in the AADC gene is associated with liability for developing schizophrenia or bipolar disorder.
1359-4184
327-331
Speight, G
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Turic, D
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Austin, J
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Hoogendoorn, B
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Cardno, AG
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Jones, L
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Murphy, KC
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Sanders, R
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McCarthy, G
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Jones, I
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McCandless, F
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McGuffin, P
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Craddock, N
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Owen, MJ
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Buckland, P
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O'Donovan, MC
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Speight, G
b137fb24-c895-4eac-a53e-c055250fb313
Turic, D
af473e34-6d9d-47a9-af16-041fc3361b7e
Austin, J
ce9d5484-b0cd-42b8-aac9-84faa5e25c28
Hoogendoorn, B
f3037a03-4425-40c6-86c3-bb5fee0ab3b6
Cardno, AG
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Jones, L
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Murphy, KC
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Sanders, R
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McCarthy, G
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Jones, I
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McCandless, F
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McGuffin, P
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Craddock, N
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Owen, MJ
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Buckland, P
ac39f4a2-62c2-45ce-96cb-b8dde36d0a58
O'Donovan, MC
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Speight, G, Turic, D, Austin, J, Hoogendoorn, B, Cardno, AG, Jones, L, Murphy, KC, Sanders, R, McCarthy, G, Jones, I, McCandless, F, McGuffin, P, Craddock, N, Owen, MJ, Buckland, P and O'Donovan, MC (2000) Comparative sequencing and association studies of aromatic L-amino acid decarboxylase in schizophrenia and bipolar disorder. Molecular Psychiatry, 5 (3), 327-331.

Record type: Article

Abstract

Aromatic L-amino acid decarboxylase (AADC) is a relatively non specific enzyme involved in the biosynthesis of several classical neurotransmitters including dopamine and 5-hydroxytryptamine (5HT; serotonin). AADC does not catalyse the rate limiting step in either pathway, but is rate limiting in the synthesis of 2-phenylethylamine (2PE) which is a positive modulator of dopaminergic transmission and a candidate natural psychotogenic compound.1 We and others have proposed that polymorphism in AADC resulting in altered 2PE activity might contribute to the pathogenesis of psychosis. In order to test this hypothesis, we have used denaturing high performance liquid chromatography (DHPLC)3 to screen 3943 bases of the AADC gene and its promoter regions for variants that might affect protein structure or expression in 15 unrelated people with schizophrenia, and 15 unrelated people with bipolar disorder. Three polymorphisms were identified by DHPLC: a insertion/deletion polymorphism in the 5' UTR of the neuronal specific mRNA (g.-33-30delAGAG, bases 586-589 of GenBank M77828), a T>A variant in the non-neuronal exon 1 (g. -67T>A, GenBank M88070), and a G>A polymorphism within intron 8 (g. IVS8 +75G>A, GenBank M84598). Case-control analysis did not suggest that genetic polymorphism in the AADC gene is associated with liability for developing schizophrenia or bipolar disorder.

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Published date: May 2000

Identifiers

Local EPrints ID: 148437
URI: http://eprints.soton.ac.uk/id/eprint/148437
ISSN: 1359-4184
PURE UUID: 3e1d88a5-44f0-43c8-875d-c592b7b3a48f

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Date deposited: 20 Jul 2010 16:04
Last modified: 08 Jan 2022 11:32

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Contributors

Author: G Speight
Author: D Turic
Author: J Austin
Author: B Hoogendoorn
Author: AG Cardno
Author: L Jones
Author: KC Murphy
Author: R Sanders
Author: G McCarthy
Author: I Jones
Author: F McCandless
Author: P McGuffin
Author: N Craddock
Author: MJ Owen
Author: P Buckland
Author: MC O'Donovan

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