Abstract
Regulated activity of SLC6A3, which encodes the human dopamine transporter (DAT), contributes to diseases such as substance abuse disorders (SUDs); however, the exact transcription mechanism remains poorly understood. Here, we used a common genetic variant of the gene, intron 1 DNP1B sequence, as bait to screen and clone a new transcriptional activity, AZI23′UTR, for SLC6A3. AZI23′UTR is a 3′ untranslated region (3′UTR) of the human 5-Azacytidine Induced 2 gene (AZI2) but appeared to be transcribed independently of AZI2. Found to be present in both human cell nuclei and dopamine neurons, this RNA was shown to downregulate promoter activity through a variant-dependent mechanism in vitro. Both reduced RNA density ratio of AZI23′UTR/AZI2 and increased DAT mRNA levels were found in ethanol-naive alcohol-preferring rats. Secondary analysis of dbGaP GWAS datasets (Genome-Wide Association Studies based on the database of Genotypes and Phenotypes) revealed significant interactions between regions upstream of AZI23′UTR and SLC6A3 in SUDs. Jointly, our data suggest that AZI23′UTR confers variant-dependent transcriptional regulation of SLC6A3, a potential risk factor for SUDs.
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Acknowledgements
We are grateful to Kerry J. Ressler and his Neurobiology of Fear Laboratory at McLean Hospital for assistance in RNAscope analysis and to the Harvard Brain Tissue Resource Center for providing the human brain tissue samples and associated information for these investigations.
Funding
We thank NIH for granting ZL access to dbGaP, under project #1542: “Functional genomics of dopamine-related diseases,” as well as NIDA funding of DA021409. We also thank the International Graduate Exchange Program of Beijing Institute of Technology for supporting KL’s training at McLean Hospital in the USA.
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Liu, K., Yu, J., Zhao, J. et al. AZI23’UTR Is a New SLC6A3 Downregulator Associated with an Epistatic Protection Against Substance Use Disorders. Mol Neurobiol 55, 5611–5622 (2018). https://doi.org/10.1007/s12035-017-0781-2
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DOI: https://doi.org/10.1007/s12035-017-0781-2