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Wang CW, Preclaro IAC, Lin WH, Chung WH. An Updated Review of Genetic Associations With Severe Adverse Drug Reactions: Translation and Implementation of Pharmacogenomic Testing in Clinical Practice. Front Pharmacol 2022; 13:886377. [PMID: 35548363 PMCID: PMC9081981 DOI: 10.3389/fphar.2022.886377] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Accepted: 04/08/2022] [Indexed: 12/18/2022] Open
Abstract
Adverse drug reactions (ADR) remain the major problems in healthcare. Most severe ADR are unpredictable, dose-independent and termed as type B idiosyncratic reactions. Recent pharmacogenomic studies have demonstrated the strong associations between severe ADR and genetic markers, including specific HLA alleles (e.g., HLA-B*15:02/HLA-B*57:01/HLA-A*31:01 for carbamazepine-induced severe cutaneous adverse drug reactions [SCAR], HLA-B*58:01 for allopurinol-SCAR, HLA-B*57:01 for abacavir-hypersensitivity, HLA-B*13:01 for dapsone/co-trimoxazole-induced SCAR, and HLA-A*33:01 for terbinafine-induced liver injury), drug metabolism enzymes (such as CYP2C9*3 for phenytoin-induced SCAR and missense variant of TPMT/NUDT15 for thiopurine-induced leukopenia), drug transporters (e.g., SLCO1B1 polymorphism for statin-induced myopathy), and T cell receptors (Sulfanilamide binding into the CDR3/Vα of the TCR 1.3). This mini review article aims to summarize the current knowledge of pharmacogenomics of severe ADR, and the potentially clinical use of these genetic markers for avoidance of ADR.
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Affiliation(s)
- Chuang-Wei Wang
- Department of Dermatology, Drug Hypersensitivity Clinical and Research Center, Chang Gung Memorial Hospital, Taipei and Keelung, Taiwan.,Cancer Vaccine and Immune Cell Therapy Core Laboratory, Chang Gung Memorial Hospital, Linkou, Taiwan.,Chang Gung Immunology Consortium, Chang Gung Memorial Cital and Chang Gung University, Taoyuan, Taiwan.,Department of Dermatology, Xiamen Chang Gung Hospital, Xiamen, China
| | - Ivan Arni C Preclaro
- Department of Dermatology, Drug Hypersensitivity Clinical and Research Center, Chang Gung Memorial Hospital, Taipei and Keelung, Taiwan
| | - Wei-Hsiang Lin
- College of Medicine, Chang Gung University, Taoyuan, Taiwan
| | - Wen-Hung Chung
- Department of Dermatology, Drug Hypersensitivity Clinical and Research Center, Chang Gung Memorial Hospital, Taipei and Keelung, Taiwan.,Cancer Vaccine and Immune Cell Therapy Core Laboratory, Chang Gung Memorial Hospital, Linkou, Taiwan.,Chang Gung Immunology Consortium, Chang Gung Memorial Cital and Chang Gung University, Taoyuan, Taiwan.,Department of Dermatology, Xiamen Chang Gung Hospital, Xiamen, China.,Whole-Genome Research Core Laboratory of Human Diseases, Chang Gung Memorial Hospital, Keelung, Taiwan.,Department of Dermatology, Beijing Tsinghua Chang Gung Hospital, School of Clinical Medicine, Tsinghua University, Beijing, China.,Department of Dermatology, Ruijin Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China.,Genomic Medicine Core Laboratory, Chang Gung Memorial Hospital, Linkou, Taiwan
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Li X, Tan XY, Cui XJ, Yang M, Chen C, Chen XY. Pharmacokinetics of Tenofovir Alafenamide Fumarate and Tenofovir in the Chinese People: Effects of Non-Genetic Factors and Genetic Variations. PHARMACOGENOMICS & PERSONALIZED MEDICINE 2021; 14:1315-1329. [PMID: 34703277 PMCID: PMC8525415 DOI: 10.2147/pgpm.s329690] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Accepted: 09/28/2021] [Indexed: 01/05/2023]
Abstract
Background Tenofovir alafenamide fumarate (TAF) was approved for HBV treatment in China in 2018. Despite higher antiviral efficacy and less impact on renal function and bone mineral density, the pharmacokinetic profiles of TAF are highly variable. The objectives of this study were to investigate the pharmacokinetics of TAF in the Chinese population and explore the associations between TAF and genetic polymorphisms and non-genetic factors. Patients and Methods A total of 64 healthy Chinese subjects aged 18~65 years old were planned to enroll. According to the dietary intake status, the subjects were divided into two groups (n = 32 per group). The concentrations of TAF and tenofovir were measured by HPLC-MS/MS, and the single-nucleotide polymorphisms were analyzed by MALDI-TOF MS. Results All the enrolled participants (18–35 years) completed the clinical trial study. Similar to the results reported in other ethnic populations, the pharmacokinetic profiles of TAF and tenofovir were highly variable in the Chinese people, and the HFHC diet can significantly increase the systemic exposure of TAF. We determined both HFHC diet and rs7311358 (SLCO1B3) genotypes were independently associated with TAF AUC0-t, while HFHC diet, age and rs3740066 (ABCC2) variants were predictive of t1/2 of tenofovir (P < 0.05). The subjects with the AA genotype in rs7311358 had significantly higher TAF AUC0-t values (1.15 times) than those with a G allele, and the t1/2 of tenofovir in the rs3740066 TT genotype group was 1.23 times longer than that of CC genotype group. Furthermore, there was a trend of higher TAF AUC and shorter tenofovir t1/2 for the rs2032582 (ABCB1) T allele and rs3742106 (ABCC4) CC variant, respectively, although not statistically significant in the multiple linear regression analysis. Conclusion This study provided new evidence to suggest a critical link between both genetic and non-genetic factors and TAF pharmacokinetics in the Chinese people.
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Affiliation(s)
- Xue Li
- Phase I Clinical Research Laboratory of Shanghai LongHua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, People's Republic of China
| | - Xin-Yi Tan
- Department of Rheumatology of Shanghai LongHua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, People's Republic of China
| | - Xue-Jun Cui
- Institute of Spinal Disease, Shanghai University of Traditional Chinese Medicine, Shanghai, People's Republic of China
| | - Ming Yang
- Phase I Clinical Research Laboratory of Shanghai LongHua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, People's Republic of China
| | - Chao Chen
- Phase I Clinical Research Laboratory of Shanghai LongHua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, People's Republic of China
| | - Xiao-Yun Chen
- Department of Rheumatology of Shanghai LongHua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, People's Republic of China
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Kaalund-Brok K, Houmann TB, Hebsgaard MB, Lauritsen MBG, Lundstrøm LH, Grønning H, Darling L, Reinert-Petersen S, Petersen MA, Jepsen JRM, Pagsberg AK, Plessen KJ, Rasmussen HB, Jeppesen P, INDICES. Outcomes of a 12-week ecologically valid observational study of first treatment with methylphenidate in a representative clinical sample of drug naïve children with ADHD. PLoS One 2021; 16:e0253727. [PMID: 34673771 PMCID: PMC8530346 DOI: 10.1371/journal.pone.0253727] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2020] [Accepted: 06/04/2021] [Indexed: 11/20/2022] Open
Abstract
Randomized placebo-controlled trials have reported efficacy of methylphenidate (MPH) for Attention-deficit/hyperactivity disorder (ADHD); however, selection biases due to strict entry criteria may limit the generalizability of the findings. Few ecologically valid studies have investigated effectiveness of MPH in representative clinical populations of children. This independently funded study aims to describe treatment responses and their predictors during the first 12 weeks of MPH treatment using repeated measurements of symptoms and adverse reactions (ARs) to treatment in 207 children recently diagnosed with ADHD. The children were consecutively included from the Child and Adolescent Mental Health Centre, Mental Health Services, The Capital Region of Denmark. The children (mean age, 9.6 years [range 7–12], 75.4% males) were titrated with MPH, based on weekly assessments of symptoms (18-item ADHD-rating scale scores, ADHD-RS-C) and ARs. At study-end 187 (90.8%) children reached a mean end-dose of 1.0 mg/kg/day. A normalisation/borderline normalisation on ADHD-RS-C was achieved for 168 (81.2%) children on the Inattention and/or the Hyperactivity-Impulsivity subscale in week 12, and 31 (15.0%) children were nonresponders, which was defined as absence of normalisation/borderline normalisation (n = 19) or discontinuation due to ARs (n = 12), and eight (3.8%) children dropped out from follow-up. Nonresponders were characterised by more severe symptoms of Hyperactivity-Impulsivity and global impairment before the treatment. ARs were few; the most prominent were appetite reduction and weight loss. A decrease in AR-like symptoms during the treatment period questions the validity of currently available standard instruments designed to measure ARs of MPH. This ecologically valid observational study supports prior randomized placebo-controlled trials; 81.2% of the children responded favourably in multiple domains with few harmful effects to carefully titrated MPH. Clinical trial registration: ClinicalTrials.gov with registration number NCT04366609.
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Affiliation(s)
- Kristine Kaalund-Brok
- Child and Adolescent Mental Health Centre, Research Unit, Mental Health Services, The Capital Region of Denmark, Hellerup, Denmark
- * E-mail:
| | - Tine Bodil Houmann
- Child and Adolescent Mental Health Centre, Research Unit, Mental Health Services, The Capital Region of Denmark, Hellerup, Denmark
| | - Marie Bang Hebsgaard
- Child and Adolescent Mental Health Centre, Research Unit, Mental Health Services, The Capital Region of Denmark, Hellerup, Denmark
| | - Maj-Britt Glenn Lauritsen
- Child and Adolescent Mental Health Centre, Research Unit, Mental Health Services, The Capital Region of Denmark, Hellerup, Denmark
| | - Louise Hyldborg Lundstrøm
- Child and Adolescent Mental Health Centre, Research Unit, Mental Health Services, The Capital Region of Denmark, Hellerup, Denmark
| | - Helene Grønning
- Child and Adolescent Mental Health Centre, Research Unit, Mental Health Services, The Capital Region of Denmark, Hellerup, Denmark
| | - Lise Darling
- Child and Adolescent Mental Health Centre, Research Unit, Mental Health Services, The Capital Region of Denmark, Hellerup, Denmark
| | - Susanna Reinert-Petersen
- Child and Adolescent Mental Health Centre, Research Unit, Mental Health Services, The Capital Region of Denmark, Hellerup, Denmark
| | - Morten Aagaard Petersen
- The Research Unit, Department of Palliative Medicine, Bispebjerg Hospital, Copenhagen University Hospital, Copenhagen, The Capital Region of Denmark, Copenhagen, Denmark
| | - Jens Richardt Møllegaard Jepsen
- Child and Adolescent Mental Health Centre, Research Unit, Mental Health Services, The Capital Region of Denmark, Hellerup, Denmark
- Center for Clinical Intervention and Neuropsychiatric Schizophrenia Research (CINS) and Center for Neuropsychiatric Schizophrenia Research (CNSR), Mental Health Services Glostrup, The Capital Region of Denmark, Glostrup, Denmark
| | - Anne Katrine Pagsberg
- Child and Adolescent Mental Health Centre, Research Unit, Mental Health Services, The Capital Region of Denmark, Hellerup, Denmark
| | - Kerstin Jessica Plessen
- Child and Adolescent Mental Health Centre, Research Unit, Mental Health Services, The Capital Region of Denmark, Hellerup, Denmark
| | - Henrik Berg Rasmussen
- Institute of Biological Psychiatry, Mental Health Centre Sct. Hans, Copenhagen University Hospital, The Capital Region of Denmark, Roskilde, Denmark
- Department of Science & Environment, Roskilde University, Roskilde, Denmark
| | - Pia Jeppesen
- Child and Adolescent Mental Health Centre, Research Unit, Mental Health Services, The Capital Region of Denmark, Hellerup, Denmark
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Ching C, Eslick GD, Poulton AS. Evaluation of Methylphenidate Safety and Maximum-Dose Titration Rationale in Attention-Deficit/Hyperactivity Disorder: A Meta-analysis. JAMA Pediatr 2019; 173:630-639. [PMID: 31135892 PMCID: PMC6547117 DOI: 10.1001/jamapediatrics.2019.0905] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/26/2018] [Accepted: 02/05/2019] [Indexed: 12/18/2022]
Abstract
IMPORTANCE Evidence on the titration of stimulant medications for attention-deficit/hyperactivity disorder (ADHD) is lacking. However, this lack of evidence has not prevented medication guidelines from specifying apparently arbitrary dose limitations, which could discourage clinicians from titrating methylphenidate to higher and, perhaps for some patients, more efficacious doses. OBJECTIVE To determine the evidence on dose titration and adverse events associated with dose titration of stimulants for ADHD. DATA SOURCES MEDLINE from 1946, Embase from 1974, and PsycINFO from 1806 through April 1, 2019, were searched to identify relevant articles. STUDY SELECTION The inclusion criteria were that (1) the study was conducted on children up to 18 years of age; (2) children had a diagnosis of ADHD according to the Diagnostic and Statistical Manual of Mental Disorders, or hyperkinetic disorder according to the International Classification of Diseases codes; and (3) the dose of methylphenidate was determined by titration. DATA EXTRACTION AND SYNTHESIS The PRISMA guidelines for abstracting data and assessing data quality and validity were followed. Quality assessment was undertaken using the Jadad scoring system. Statistical analysis was undertaken using a random-effects model. MAIN OUTCOMES AND MEASURES The outcomes of interest were (1) the doses used in published clinical trials, (2) the clinical justification given by researchers for their selected dose range, and (3) the adverse effects associated with methylphenidate when the dose is established by titration. RESULTS A total of 11 randomized clinical trials and 38 cohort studies were analyzed. The randomized clinical trials involved 1304 participants treated with methylphenidate and 887 controls; the 38 cohort studies included 5524 participants. Maximum doses of methylphenidate ranged from 0.8 to 1.8 mg/kg/d. Some studies detailed their method of titration, including starting dose, titration interval, increment dose, and maximum dose. Not all of these studies reported justification for the chosen dose range. Common adverse effects of methylphenidate included insomnia (odds ratio, 4.66; 95% CI, 1.99-10.92; P < .001), anorexia (5.11 higher than for those who took placebo; 95% CI, 1.99-13.14; P < .001), abdominal pain (1.9 times more likely; 95% CI, 0.77-4.77; P = .16), and headache (14% of participants; 95% CI, 10%-20%; P < .001). CONCLUSIONS AND RELEVANCE A range of maximum doses for methylphenidate was recommended in clinical studies; no discernable scientific justification for any particular dose was given. Reports of life-threatening adverse events were absent; further studies of the efficacy, tolerability, and safety of methylphenidate titrated purely on clinical grounds, without reference to any set maximum dose, are needed.
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Affiliation(s)
- Cellina Ching
- Western Sydney University, Sydney, New South Wales, Australia
| | - Guy D. Eslick
- The Whiteley-Martin Research Centre, Department of Surgery, The University of Sydney, Penrith, New South Wales, Australia
| | - Alison S. Poulton
- Charles Perkins Centre Nepean, The University of Sydney, Penrith, New South Wales, Australia
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PharmGKB summary: methylphenidate pathway, pharmacokinetics/pharmacodynamics. Pharmacogenet Genomics 2019; 29:136-154. [PMID: 30950912 DOI: 10.1097/fpc.0000000000000376] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Patrick KS, Radke JL, Raymond JR, Koller L, Nguyen LV, Rodriguez W, Straughn AB. Drug Regimen Individualization for Attention‐Deficit/Hyperactivity Disorder: Guidance for Methylphenidate and Dexmethylphenidate Formulations. Pharmacotherapy 2018; 39:677-688. [PMID: 30351459 DOI: 10.1002/phar.2190] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Kennerly Sexton Patrick
- Department of Drug Discovery & Biomedical Sciences Medical University of South Carolina, College of Pharmacy Charleston South Carolina
| | - Jennifer L. Radke
- Department of Drug Discovery & Biomedical Sciences Medical University of South Carolina, College of Pharmacy Charleston South Carolina
| | - John R. Raymond
- Department of Drug Discovery & Biomedical Sciences Medical University of South Carolina, College of Pharmacy Charleston South Carolina
| | - Lauren Koller
- Department of Drug Discovery & Biomedical Sciences Medical University of South Carolina, College of Pharmacy Charleston South Carolina
| | - Linda V. Nguyen
- Department of Drug Discovery & Biomedical Sciences Medical University of South Carolina, College of Pharmacy Charleston South Carolina
| | - Wendy Rodriguez
- Department of Drug Discovery & Biomedical Sciences Medical University of South Carolina, College of Pharmacy Charleston South Carolina
| | - Arthur B. Straughn
- Department of Pharmaceutical Sciences University of Tennessee Health Sciences Center, College of Pharmacy Memphis Tennessee
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Increasing BMI is associated with reduced expression of P-glycoprotein (ABCB1 gene) in the human brain with a stronger association in African Americans than Caucasians. THE PHARMACOGENOMICS JOURNAL 2016; 18:121-126. [PMID: 27897267 PMCID: PMC5817387 DOI: 10.1038/tpj.2016.74] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/28/2015] [Revised: 06/14/2016] [Accepted: 06/15/2016] [Indexed: 01/11/2023]
Abstract
The efflux pump, p-glycoprotein, controls bioavailability and excretion of pharmaceutical compounds. In the blood-brain barrier, p-glycoprotein regulates the delivery of pharmaceutical substances to the brain, influencing efficacy and side effects for some drugs notably antipsychotics. Common side effects to antipsychotics include obesity and metabolic disease. Polymorphisms in the ABCB1 gene coding for p-glycoprotein are associated with more severe side effects to neuro-pharmaceuticals as well as weight gain, indicating a potential link between p-glycoprotein function and metabolic regulation. Using microarray data analysis from 145 neurologically sound adults, this study investigated the association between body mass index (BMI) and ABCB1 expression in the frontal cortex. Increasing BMI values were associated with a statistically significantly reduced expression of ABCB1. Investigation of DNA methylation patterns in a subgroup of 52 individuals found that the methylation/expression ratios of ABCB1 were unaffected by increasing BMI values. Interestingly, the effect of BMI on ABCB1 expression appeared stronger in African Americans than in Caucasians.
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Ardic UA, Ercan ES, Ercan E, Yuce D, Basay BK. Osmotic Release Oral System Methylphenidate is More Effective Than Immediate Release Methylphenidate: A Retrospective Chart Review in Turkish Children with Attention Deficit Hyperactivity Disorder. ACTA ACUST UNITED AC 2016. [DOI: 10.5455/bcp.20141009112739] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Ulku Akyol Ardic
- Ege University Faculty of Medicine, Department of Child and Adolescent Psychiatry, Izmir - Turkey
| | - Eyup Sabri Ercan
- Ege University Faculty of Medicine, Department of Child and Adolescent Psychiatry, Izmir - Turkey
| | - Elif Ercan
- Ege University Faculty of Education, Department of Psychological Counseling and Guidance, Izmir - Turkey
| | - Deniz Yuce
- Hacettepe University Cancer Institute, Department of Preventive Oncology, Ankara - Turkey
| | - Burge Kabukcu Basay
- Ege University Faculty of Medicine, Department of Child and Adolescent Psychiatry, Izmir - Turkey
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Pharmacogenetic analysis of advanced non-small-cell lung cancer patients treated with first-line paclitaxel and carboplatin chemotherapy. Pharmacogenet Genomics 2016; 26:116-25. [PMID: 26641474 DOI: 10.1097/fpc.0000000000000196] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
BACKGROUND Genetic polymorphisms contribute toward interindividual variations in drug response. We investigated the effects of genetic polymorphisms on the clinical outcome of advanced non-small-cell lung cancer patients with first-line paclitaxel and carboplatin. MATERIALS AND METHODS A total of 194 non-small-cell lung cancer patients were prospectively enrolled from January 2010 to January 2013. We genotyped 11 polymorphisms in seven genes involved in the glycolysis pathway and the related pharmacokinetic/pharmacodynamic pathway. Genetic associations with PET-SUV, survival outcome, and toxicity were analyzed, and in-vitro drug transport activity was measured in the oocyte system. RESULTS Patients with the c.334 T>G and c.699 G>A homozygous variant in SLCO1B3 showed a higher incidence of grade 3/4 anemia (P=0.002). Transport activities of oocyte that overexpress the SLCO1B3 c.699 G>A variant showed a significantly decreased uptake of paclitaxel compared with the wild-type expressing oocytes. In addition, patients with GG/GA/AA genotypes of ABCB1, c.2677 T>G/A locus showed inferior progression-free survival (hazard ratio=1.49, P=0.017) compared with other genotypes. The GA genotype of HIF1A, c.1834 G>A locus was associated with inferior progression-free survival compared with the GG genotype (hazard ratio=2.47, P=0.008). CONCLUSION This study showed that the SLCO1B3 c.699 G>A polymorphism may predict anemia and ABCB1, HIF1A polymorphism are highly predictive for worse survival in advanced NSCLC with first-line paclitaxel and carboplatin.
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McLean C, Wilson A, Kim RB. Impact of Transporter Polymorphisms on Drug Development: Is It Clinically Significant? J Clin Pharmacol 2016; 56 Suppl 7:S40-58. [DOI: 10.1002/jcph.691] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2015] [Accepted: 12/02/2015] [Indexed: 01/20/2023]
Affiliation(s)
- Cheynne McLean
- Department of Physiology and Pharmacology; Western University; London, Ontario Canada
| | - Aze Wilson
- Department of Physiology and Pharmacology; Western University; London, Ontario Canada
- Department of Medicine; Western University; London, Ontario Canada
| | - Richard B. Kim
- Department of Physiology and Pharmacology; Western University; London, Ontario Canada
- Department of Medicine; Western University; London, Ontario Canada
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Bruxel EM, Akutagava-Martins GC, Salatino-Oliveira A, Contini V, Kieling C, Hutz MH, Rohde LA. ADHD pharmacogenetics across the life cycle: New findings and perspectives. Am J Med Genet B Neuropsychiatr Genet 2014; 165B:263-82. [PMID: 24804845 DOI: 10.1002/ajmg.b.32240] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/08/2013] [Accepted: 04/14/2014] [Indexed: 12/17/2022]
Abstract
Attention-deficit/hyperactivity disorder (ADHD) is a complex and heterogeneous disorder, affecting individuals across the life cycle. Although its etiology is not yet completely understood, genetics plays a substantial role. Pharmacological treatment is considered effective and safe for children and adults, but there is considerable inter-individual variability among patients regarding response to medication, required doses, and adverse events. We present here a systematic review of the literature on ADHD pharmacogenetics to provide a critical discussion of the existent findings, new approaches, limitations, and recommendations for future research. Our main findings are: first, the number of studies continues to grow, making ADHD one of the mental health areas with more pharmacogenetic studies. Second, there has been a focus shift on ADHD pharmacogenetic studies in the last years. There is an increasing number of studies assessing gene-gene and gene-environment interactions, using genome-wide association approaches, neuroimaging, and assessing pharmacokinetic properties. Third and most importantly, the heterogeneity in methodological strategies employed by different studies remains impressive. The question whether pharmacogenetics studies of ADHD will improve clinical management by shifting from trial-and-error approach to a pharmacological regimen that takes into account the individual variability remains unanswered. © 2014 Wiley Periodicals, Inc.
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Affiliation(s)
- Estela Maria Bruxel
- Genetics Department, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
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