Cited by 563Neuropeptides and Animal PhysiologyGenetic Associations and EpidemiologyNeurotransmitter Receptor Influence on Behavior

Allelic Expression Imbalance of Human mu Opioid Receptor (OPRM1) Caused by Variant A118G

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Zhang, Ying, Wang, Danxin, Johnson, Andrew D., Papp, Audrey C., Sadée, Wolfgang·2005·Journal of Biological Chemistry

Abstract

As a primary target for opioid drugs and peptides, the mu opioid receptor (OPRM1) plays a key role in pain perception and addiction. Genetic variants of OPRM1 have been implicated in predisposition to drug addiction, in particular the single nucleotide polymorphism A118G, leading to an N40D substitution, with an allele frequency of 10-32%, and uncertain functions. We have measured allele-specific mRNA expression of OPRM1 in human autopsy brain tissues, using A118G as a marker. In 8 heterozygous samples measured, the A118 mRNA allele was 1.5-2.5-fold more abundant than the G118 allele. Transfection into Chinese hamster ovary cells of a cDNA representing only the coding region of OPRM1, carrying adenosine, guanosine, cytidine, and thymidine in position 118, resulted in 1.5-fold lower mRNA levels only for OPRM1-G118, and more than 10-fold lower OPRM1 protein levels, measured by Western blotting and receptor binding assay. After transfection and inhibition of transcription with actinomycin D, analysis of mRNA turnover failed to reveal differences in mRNA stability between A118 and G118 alleles, indicating a defect in transcription or mRNA maturation. These results indicate that OPRM1-G118 is a functional variant with deleterious effects on both mRNA and protein yield. Clarifying the functional relevance of polymorphisms associated with susceptibility to a complex disorder such as drug addiction provides a foundation for clinical association studies.

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Crossref · 10.1074/jbc.m504942200

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Authors
Zhang, Y., Wang, D., Johnson, A. D., Papp, A. C., & Sadée, W.
Affiliations
The Ohio State University (US)
Corresponding author
Sadée, Wolfgang
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2005-09
Volume
280
Issue
38
Pages
32618-32624
ISSN
0021-9258 (ISSN-L)
OpenAlex
W1996783118
Cited by
563
References
44
Citations by year
2026: 5 · 2025: 7 · 2024: 9 · 2023: 11 · 2022: 27 · 2021: 14 · 2020: 21 · 2019: 24 · 2018: 24 · 2017: 26 · 2016: 22 · 2015: 41 · 2014: 39 · 2013: 37 · 2012: 46
FWCI
12.94
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
National Institute on Drug Abuse (DA018744, R21DA018744)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuropeptides and Animal Physiology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic Associations and Epidemiology
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
Keywords
mu-opioid receptor, OPRM1, A118G polymorphism, gene dosage imbalance, mRNA stability, transcriptional defects, receptor expression, human brain tissue
MeSH terms
Alleles, Animals, Brain, Cell Line, Dactinomycin, DNA, Gene Frequency, Genotype, Cricetinae, Heterozygote, Humans, Nucleic Acid Conformation, Plasmids, Polymorphism, Genetic, RNA, Messenger, Time Factors, Transcription, Genetic, Transfection, Genetic Variation, Blotting, Western, Mutagenesis, Mutagenesis, Site-Directed, CHO Cells, Receptors, Opioid, mu, DNA, Complementary, Nucleic Acid Synthesis Inhibitors, Substance-Related Disorders, Genetic Predisposition to Disease, Reverse Transcriptase Polymerase Chain Reaction, Polymorphism, Single Nucleotide, Allelic Imbalance

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