Cited by 43Neurobiology and Insect Physiology ResearchGenetics and Neurodevelopmental DisordersUbiquitin and proteasome pathways

Drosophila Ube3a regulates monoamine synthesis by increasing GTP cyclohydrolase I activity via a non-ubiquitin ligase mechanism

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Ferdousy, Faiza, Bodeen, William, Summers, Kyle, Doherty, Olugbenga, Wright, O'Neil, Elsisi, Nahed, Hilliard, George, O'Donnell, Janis M. +1 more·2011·Neurobiology of Disease

Abstract

The underlying defects in Angelman syndrome (AS) and autism spectrum disorder (ASD) may be in part due to basic defects in synaptic plasticity and function. In some individuals serotonin reuptake inhibitors, which decrease pre-synaptic re-uptake of serotonin, can ameliorate symptoms, as can resperidone, which blocks both dopamine and serotonin receptors. Loss of maternal UBE3A expression causes AS, while maternal duplications of chromosome 15q11.2-q13 that include the UBE3A gene cause ASD, implicating the maternally expressed UBE3A gene in the ASD phenotype. In a Drosophila screen for proteins regulated by UBE3A, we identified a key regulator of monoamine synthesis, the gene Punch, or GCH1, encoding the enzyme GTP cyclohydrolase I. Here we show that Dube3a, the fly UBE3A orthologue, regulates Punch/GCH1 in the fly brain. Over-expression of Dube3a elevates tetrahydrobiopterin (THB), the rate-limiting cofactor in monoamine synthesis while loss of Dube3a has the opposite effect. The fluctuations in dopamine levels were associated with hyper- and hypoactivity, respectively, in flies. We show that changes in Punch/GCH1 and dopamine levels do not depend on the ubiquitin ligase catalytic domain of Dube3a. In addition, both wild type Dube3a and a ubiquitination-defective Dube3a-C/A form were found at high levels in nuclear fractions and appear to be poly-ubiquitinated in vivo by endogenous Dube3a. We propose that the transcriptional co-activation function of Dube3a may regulate GCH1 activity in the brain. These results provide a connection between monoamine synthesis (dopamine/serotonin) and Dube3a expression that may explain why some individuals with ASD or AS respond better to selective serotonin reuptake inhibitors than others.

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Crossref · 10.1016/j.nbd.2010.12.001

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  • In Drosophila, overexpression or genetic knockout of the Drosophila homolog of Ube3a respectively increased or decreased DA levels, potentially due to changes in the expression of tetrahydrobiopterin, the rate-limiting cofactor in monoamine synthesis in flies.

    “In elegant genetic studies using the fruit-fly Drosophila, overexpression or genetic knockout of the Drosophila homolog of Ube3a respectively increased or decreased DA levels, potentially due to changes in the expression of tetrahydrobiopterin, the rate-limiting cofactor in monoamine synthesis in flies [696].”

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  1. Peterson A Reiter L Genetic screen for potential protein substrates of the Drosophila E3 ubiquitin ligase gene (dube3a) 47th Annual Drosophila Research Conference Houston, TX 2006

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Authors
Ferdousy, F., Bodeen, W., Summers, K., Doherty, O., Wright, O., Elsisi, N., Hilliard, G., O'Donnell, J. M., & Reiter, L. T.
Affiliations
  • University of Alabama (US)
  • University of Tennessee Health Science Center (US)
Corresponding author
Reiter, Lawrence T.
Venue
Neurobiology of Disease
Publisher
Elsevier BV
Published
2011-03
Volume
41
Issue
3
Pages
669-677
ISSN
0969-9961 (ISSN-L)
OpenAlex
W1993275955
Cited by
43
References
52
Citations by year
2026: 2 · 2024: 5 · 2023: 1 · 2021: 3 · 2020: 1 · 2019: 6 · 2018: 3 · 2017: 4 · 2016: 2 · 2015: 3 · 2014: 2 · 2013: 3 · 2012: 5
FWCI
1.42
Type
journal article
Language
en
Open access
Locations
  • Neurobiology of Disease (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • Autism Speaks
  • Angelman Syndrome Foundation
  • National Institute of Neurological Disorders and Stroke (R01NS059902)
  • University of Alabama
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurobiology and Insect Physiology Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetics and Neurodevelopmental Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
Keywords
UBE3A, GTP cyclohydrolase I, punch, monoamine synthesis, tetrahydrobiopterin, dopamine, serotonin, Angelman syndrome, autism spectrum disorder, ubiquitination, transcriptional coactivation, synaptic plasticity, serotonin reuptake inhibitors, Drosophila
MeSH terms
Animals, Dopamine, Drosophila, Enzyme Activation, Female, GTP Cyclohydrolase, Humans, Male, Mutation, Serotonin, Up-Regulation, Drosophila Proteins, Animals, Genetically Modified, Ubiquitin-Protein Ligases

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