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Kandemis E, Tuncel G, Asut O, Temel SG, Ergoren MC. Strong Association between Serotonin Transporter 5-HTTVNTR Variant and Psychoactive Substance (Nicotine) Use in the Turkish Cypriot Population. Curr Drug Metab 2020; 21:466-470. [PMID: 32562520 DOI: 10.2174/1389200221666200620201348] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Revised: 04/13/2020] [Accepted: 05/08/2020] [Indexed: 11/22/2022]
Abstract
BACKGROUND The use of psychoactive substances is one of the most dangerous social problems worldwide. Nicotine dependence results from the interaction between neurobiological, environmental and genetic factors. Serotonin is a neurotransmitter that has a wide range of central nervous system activities. The serotonin transporter gene has been previously linked to psychological traits. OBJECTIVE A variable number of tandem repeats within the serotonin transporter-linked polymorphic gene region are believed to alter the transcriptional efficiency of the 5-HTT gene. Therefore, we aimed to investigate the association between this polymorphic site and smoking behavior in the Turkish Cypriot population. METHODS A total of 259 (100 smokers, 100 non-smokers and 59 ex-smokers) Turkish Cypriots were included in this population-based cross-sectional study. Genomic DNA was extracted from peripheral blood samples and the 5-HTTVNTR2 polymorphisms were determined by the PCR-RFLP. RESULTS The allelic frequency and genotype distribution results of this study showed a strong association (P<0.0001) between smokers and non-smokers. No statistical significance was found between non-smokers and ex-smokers. CONCLUSION This is the first genetic epidemiology study to investigate the allelic frequencies of 5-HTTVNTR2 polymorphisms associated with smoking behavior in the Turkish Cypriot population. Based on the results of this study, genome-wide association studies should be designed for preventive medicine in this population.
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Affiliation(s)
- Emine Kandemis
- Department of Molecular Biology and Genetics, Faculty of Engineering and Natural Sciences, Bahçeşehir University, Istanbul 34353, Turkey
| | - Gulten Tuncel
- Department of Medical Biology, Faculty of Medicine, Near East University, Nicosia 99138, Cyprus
| | - Ozen Asut
- Department of Public Health, Faculty of Medicine, Near East University, Nicosia 99138, Cyprus
| | - Sehime G Temel
- Department of Medical Genetics, Faculty of Medicine, Uludag University, Bursa 16059, Turkey
| | - Mahmut C Ergoren
- Department of Medical Biology, Faculty of Medicine, Near East University, Nicosia 99138, Cyprus
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Kõks G, Prans E, Tran HDT, Ngo NBT, Hoang LNN, Tran HMT, Cao Ngoc T, Doan Phuoc T, Ho XD, Ho Duy B, Lättekivi F, Quinn J, Kõks S. Genetic Interaction Between Two VNTRs in the SLC6A4 Gene Regulates Nicotine Dependence in Vietnamese Men. Front Pharmacol 2018; 9:1398. [PMID: 30559666 PMCID: PMC6287221 DOI: 10.3389/fphar.2018.01398] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2018] [Accepted: 11/13/2018] [Indexed: 11/29/2022] Open
Abstract
Nicotine dependence is an addiction to tobacco products and a global public health concern. Association between the SLC6A4 polymorphisms and nicotine dependence is controversial. Two variable number tandem repeat (VNTR) domains, termed HTTLPR and STin2, in the SLC6A4 gene are well characterized transcriptional regulatory elements. Their polymorphism in the copy number of the repeat correlates with the particular personality and psychiatric traits. We analyzed nicotine dependence in 1,804 participants from Central Vietnam. The Fagerström Test (FTND) was used to evaluate the nicotine dependence and PCR was used to determine the SLC6A4 HTTLPR and STin2 VNTRs. The HTTLPR VNTR was associated with difficulties to refrain from smoking in a prohibiting environment. The STIn2 10/10 genotype was associated with (1) years of smoking, (2) difficulties to quit the first cigarette, and (3) higher number of cigarettes smoked per day (CPD). Stratification analysis was used to find the genetic interaction between these two VNTRs in nicotine dependence as they may synergistically regulate the SLC6A4 expression. Smokers with the S/S HTTLPR genotypes showed a much stronger association between STin2 10/10 variant and CPD. This finding is consistent with the molecular evidence for the functional interaction between HTTLPR and STin2 in cell line models, where STin2 has described as a stronger expressional regulator. Similarly, we found that STin2 is a much stronger modifier of smoking with 10/10 genotype related to higher nicotine dependence. The present study supports genetic interaction between HTTLPR and STin2 VNTRs in the regulation of nicotine dependence with the dominance of the STin2 effects. This finding could be explained by their differential effect on the SLC6A4 expression.
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Affiliation(s)
- Gea Kõks
- Department of Pathophysiology, University of Tartu, Tartu, Estonia
| | - Ele Prans
- Department of Pathophysiology, University of Tartu, Tartu, Estonia
| | - Ha Diep Thi Tran
- Public Health Faculty, Danang University of Medical Technology and Pharmacy, Da Nang, Vietnam
| | - Ngoc Bich Thi Ngo
- Public Health Faculty, Danang University of Medical Technology and Pharmacy, Da Nang, Vietnam
| | - Linh Nhat Nguyen Hoang
- Public Health Faculty, Danang University of Medical Technology and Pharmacy, Da Nang, Vietnam
| | - Hue Minh Thi Tran
- Public Health Faculty, Danang University of Medical Technology and Pharmacy, Da Nang, Vietnam
| | - Thanh Cao Ngoc
- College of Medicine and Pharmacy, Hue University, Hue, Vietnam
| | | | - Xuan Dung Ho
- Department of Pathophysiology, University of Tartu, Tartu, Estonia.,College of Medicine and Pharmacy, Hue University, Hue, Vietnam
| | - Binh Ho Duy
- Department of Pathophysiology, University of Tartu, Tartu, Estonia.,College of Medicine and Pharmacy, Hue University, Hue, Vietnam
| | - Freddy Lättekivi
- Department of Pathophysiology, University of Tartu, Tartu, Estonia
| | - John Quinn
- Molecular and Clinical Pharmacology, University of Liverpool, Liverpool, United Kingdom
| | - Sulev Kõks
- Department of Pathophysiology, University of Tartu, Tartu, Estonia.,Department of Reproductive Biology, Estonian University of Life Sciences, Tartu, Estonia.,The Perron Institute for Neurological and Translational Science, Nedlands, WA, Australia
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Iurescia S, Seripa D, Rinaldi M. Looking Beyond the 5-HTTLPR Polymorphism: Genetic and Epigenetic Layers of Regulation Affecting the Serotonin Transporter Gene Expression. Mol Neurobiol 2016; 54:8386-8403. [DOI: 10.1007/s12035-016-0304-6] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Accepted: 11/16/2016] [Indexed: 01/01/2023]
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Pizzo de Castro MR, Vargas Nunes SO, Guembarovski RL, Ariza CB, Oda JMM, Vargas HO, Piccoli de Melo LG, Watanabe MAE, Berk M, Maes M. STin2 VNTR polymorphism is associated with comorbid tobacco use and mood disorders. J Affect Disord 2015; 172:347-54. [PMID: 25451436 DOI: 10.1016/j.jad.2014.10.023] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/04/2014] [Revised: 10/11/2014] [Accepted: 10/11/2014] [Indexed: 11/18/2022]
Abstract
BACKGROUND There is a significant comorbidity between mood disorders and tobacco use disorder (TUD), which may be related to both genetic and environmental factors. Gene variants of the 5-HT transporter, such as STin2 VNTR (a variable number of tandem repeats in the functional serotonin transporter intron 2) may be associated with mood disorders and TUD. AIMS This study aimed to delineate the association between the STin2 genetic polymorphism and comorbid TUD and mood disorders, including depression or bipolar disorder. METHODS We examined the STin2 VNTR polymorphism in never-smokers (n=113); patients with mood disorders without TUD (n=62); patients with TUD without mood disorders (n=90); and patients with both disorders (n=95). RESULTS We found a significant association between the STin2 genetic polymorphism and the above diagnostic groups whereby the STin2.12 allele shows a positive association with comorbid TUD and mood disorders (Odds ratio=3.07, 95% CI=1.41-6.68), while the STin2.10/10 homozygous genotype shows a negative association (Odds ratio=0.34, 95% CI=0.16-0.74). Adjusting for years of education, age, gender, marital status and ethnicity did not change these results, but showed that TUD was associated with lower education levels and less stable relationships, whereas mood disorders were related to female gender. A family history of TUD was significantly associated with TUD in subjects without mood disorders only. CONCLUSIONS The STin2.12 allele is positively and the STin2.10/10 genotype is negatively associated with comorbid TUD and mood disorders, depression or bipolar depression, suggesting that biological endophenotypes, e.g. disorders in serotonin metabolism, may in part underpin this comorbidity.
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Affiliation(s)
- Márcia Regina Pizzo de Castro
- Center of Approach and Treatment for Smokers, University Hospital, Londrina State University, Campus Universitário, Londrina, Paraná, Brazil.
| | - Sandra Odebrecht Vargas Nunes
- Center of Approach and Treatment for Smokers, University Hospital, Londrina State University, Campus Universitário, Londrina, Paraná, Brazil; Department of Clinical Medicine, Health Sciences Center, Londrina State University, University Hospital, Londrina, Paraná, Brazil
| | - Roberta Losi Guembarovski
- Department of Pathological Sciences, Biological Sciences Centre, Londrina State University, Paraná, Brazil
| | - Carolina Batista Ariza
- Department of Pathological Sciences, Biological Sciences Centre, Londrina State University, Paraná, Brazil
| | - Julie Massayo Maeda Oda
- Department of Pathological Sciences, Biological Sciences Centre, Londrina State University, Paraná, Brazil
| | - Heber Odebrecht Vargas
- Center of Approach and Treatment for Smokers, University Hospital, Londrina State University, Campus Universitário, Londrina, Paraná, Brazil; Department of Clinical Medicine, Health Sciences Center, Londrina State University, University Hospital, Londrina, Paraná, Brazil
| | - Luiz Gustavo Piccoli de Melo
- Center of Approach and Treatment for Smokers, University Hospital, Londrina State University, Campus Universitário, Londrina, Paraná, Brazil
| | | | - Michael Berk
- IMPACT Strategic Research Centre, School of Medicine, Deakin University, Geelong, Victoria, Australia; Orygen Youth Health Research Centre, Centre for Youth Mental Health, Department of Psychiatry and the Florey Institute for Neuroscience and Mental Health, University of Melbourne, Parkville, Australia; Barwon Health and the Geelong Clinic, Swanston Centre, Geelong, Victoria, Australia
| | - Michael Maes
- IMPACT Strategic Research Centre, School of Medicine, Deakin University, Geelong, Victoria, Australia; Department of Psychiatry, Chulalongkorn University, Faculty of Medicine, Bangkok, Thailand; Health Sciences Graduate Program, Health Sciences Center, State University of Londrina, Brazil.
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Pizzo de Castro MR, Maes M, Guembarovski RL, Ariza CB, Reiche EMV, Vargas HO, Vargas MM, de Melo LGP, Dodd S, Berk M, Watanabe MAE, Nunes SOV. SLC6A4 STin2 VNTR genetic polymorphism is associated with tobacco use disorder, but not with successful smoking cessation or smoking characteristics: a case control study. BMC Genet 2014; 15:78. [PMID: 24968820 PMCID: PMC4114164 DOI: 10.1186/1471-2156-15-78] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2013] [Accepted: 06/18/2014] [Indexed: 11/26/2022] Open
Abstract
Background The aim of this study was to determine if variable number of tandem repeats (VNTR) in the second intron (STin2) of the serotonin transporter (SLC6A4) gene was associated with tobacco use disorder, successful smoking cessation, or smoking characteristics. In this case–control study, patients with current tobacco use disorder, diagnosed according to DSM IV criteria (n = 185), and never-smokers, diagnosed according to CDC criteria (n = 175), were recruited and received 52 weeks of combined pharmacotherapy and cognitive therapy. Successful smoking cessation was defined as exhaled carbon monoxide < 6 ppm. SLC6A4 gene STin2 VNTR polymorphism was assessed using a Multiplex-PCR-based method. At baseline, participants were evaluated using the Fagerström Test for Nicotine Dependence (FTND) and the ASSIST scale. Results The STin2.12 allele (OR = 2.45; 95% CI = 1.44-4.15, p < 0.001) was associated with an increased risk for tobacco use disorder, while the STin2.10/10 genotype (OR = 0.42; 95% CI 0.25-0.71, p < 0.001) decreased risk. There were no significant associations between tobacco use disorder and the STin2.10 or STin2.9 alleles or the other genotypes (STin2.12/12, 12/10, 12/9, 10/9 or 9/9). There were no significant associations between the STin2 genotypes and alleles and successful smoking cessation, smoking characteristics and increased alcohol or sedative use risk. Conclusions Our results suggest that the STin2.10/10 genotype and STin2.12 allele are associated with tobacco use disorder or nicotine dependence, but not with treatment response or severity of dependence. It is hypothesized that the ST2in.12 allele by modulating the metabolism of serotonin may participate in the pathophysiology of tobacco use disorder or nicotine dependence.
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Affiliation(s)
| | - Michael Maes
- IMPACT Strategic Research Centre, School of Medicine, Deakin University, Geelong, Victoria, Australia.
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Pramod AB, Foster J, Carvelli L, Henry LK. SLC6 transporters: structure, function, regulation, disease association and therapeutics. Mol Aspects Med 2013; 34:197-219. [PMID: 23506866 DOI: 10.1016/j.mam.2012.07.002] [Citation(s) in RCA: 194] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2012] [Accepted: 07/03/2012] [Indexed: 02/08/2023]
Abstract
The SLC6 family of secondary active transporters are integral membrane solute carrier proteins characterized by the Na(+)-dependent translocation of small amino acid or amino acid-like substrates. SLC6 transporters, which include the serotonin, dopamine, norepinephrine, GABA, taurine, creatine, as well as amino acid transporters, are associated with a number of human diseases and disorders making this family a critical target for therapeutic development. In addition, several members of this family are directly involved in the action of drugs of abuse such as cocaine, amphetamines, and ecstasy. Recent advances providing structural insight into this family have vastly accelerated our ability to study these proteins and their involvement in complex biological processes.
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Affiliation(s)
- Akula Bala Pramod
- Department of Pharmacology, Physiology and Therapeutics, University of North Dakota School of Medicine and Health Sciences, Grand Forks, ND 58203, United States
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Zhuo XL, Ling JJ, Zhou Y, Zhao HY, Song YF, Tan YH. NAT2 polymorphisms with oral carcinoma susceptibility: a meta-analysis. Mol Biol Rep 2012; 39:8813-9. [PMID: 22722991 DOI: 10.1007/s11033-012-1744-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2011] [Accepted: 06/07/2012] [Indexed: 12/18/2022]
Abstract
Published data have implicated NAT2 polymorphisms as risk factors for various cancers. A number of studies have focused on the association of NAT2 polymorphisms with susceptibility to oral carcinoma and have yielded inconclusive results. The aim of the present study was to derive a more precise estimation of the relationship. We first carried out a deliberate search in the databases without a language limitation, covering all papers published up to Dec 2011. A total of seven case-control studies including 1,379 cases and 1,868 controls were selected and the relevant data were extracted for systematic meta-analyses. No significant association was found for the overall data (OR: 1.04, 95 % CI: 0.79-1.39). In subgroup analyses according to ethnicity, slow acetylators might increase oral cancer risk among Asians (OR: 1.38, 95 % CI: 1.04-1.82) but not Caucasians or Mixed races. The data suggested that NAT2 polymorphisms might be a low-penetrant risk factor for oral carcinoma in Asians.
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Affiliation(s)
- Xian-Lu Zhuo
- Department of Stomatology, Xinqiao Hospital, Third Military Medical University, Chongqing, China
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