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Buainain RP, Sodré AR, dos Santos JS, Takazaki KAG, Queiroz LDS, de Oliveira CTP, de Aguiar PHP, Marson FAL, Ortega MM. Single-Base Gene Variants in MIR-146A and SCN1A Genes Related to the Epileptogenic Process in Drug-Responsive and Drug-Resistant Temporal Lobe Epilepsy-A Preliminary Study in a Brazilian Cohort Sample. Int J Mol Sci 2024; 25:6005. [PMID: 38892194 PMCID: PMC11172889 DOI: 10.3390/ijms25116005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2024] [Revised: 05/22/2024] [Accepted: 05/28/2024] [Indexed: 06/21/2024] Open
Abstract
The drug-resistant temporal lobe epilepsy (TLE) has recently been associated with single nucleotide variants (SNVs) in microRNA(miR)-146a (MIR-146A) (rs2910164) and Sodium Voltage-Gated Channel Alpha Subunit 1 (SCN1A) (rs2298771 and rs3812718) genes. Moreover, no studies have shown an association between these SNVs and susceptibility to drug-resistant and drug-responsive TLE in Brazil. Thus, deoxyribonucleic acid (DNA) samples from 120 patients with TLE (55 drug-responsive and 65 drug-resistant) were evaluated by real-time polymerase chain reaction (RT-PCR). A total of 1171 healthy blood donor individuals from the Online Archive of Brazilian Mutations (ABraOM, from Portuguese Arquivo Brasileiro On-line de Mutações), a repository containing genomic variants of the Brazilian population, were added as a control population for the studied SNVs. MIR-146A and SCN1A relative expression was performed by quantitative RT-PCR (qRT-PCR). The statistical analysis protocol was performed using an alpha error of 0.05. TLE patient samples and ABraOM control samples were in Hardy-Weinberg equilibrium for all studied SNVs. For rs2910164, the frequencies of the homozygous genotype (CC) (15.00% vs. 9.65%) and C allele (37.80% vs. 29.97%) were superior in patients with TLE compared to controls with a higher risk for TLE disease [odds ratio (OR) = 1.89 (95% confidence interval (95%CI) = 1.06-3.37); OR = 1.38 (95%CI = 1.04-1.82), respectively]. Drug-responsive patients also presented higher frequencies of the CC genotype [21.81% vs. 9.65%; OR = 2.58 (95%CI = 1.25-5.30)] and C allele [39.09% vs. 29.97%; OR = 1.50 (95%CI = 1.01-2.22)] compared to controls. For rs2298771, the frequency of the heterozygous genotype (AG) (51.67% vs. 40.40%) was superior in patients with TLE compared to controls with a higher risk for TLE disease [OR = 2.42 (95%CI = 1.08-5.41)]. Drug-resistant patients presented a higher AG frequency [56.92% vs. 40.40%; OR = 3.36 (95%CI = 1.04-17.30)] compared to the control group. For rs3812718, the prevalence of genotypes and alleles were similar in both studied groups. The MIR-146A relative expression level was lower in drug-resistant compared to drug-responsive patients for GC (1.6 vs. 0.1, p-value = 0.049) and CC (1.8 vs. 0.6, p-value = 0.039). Also, the SCN1A relative expression levels in samples from TLE patients were significantly higher in AG [2.09 vs. 1.10, p-value = 0.038] and GG (3.19 vs. 1.10, p-value < 0.001) compared to the AA genotype. In conclusion, the rs2910164-CC and rs2298771-AG genotypes are exerting significant risk influence, respectively, on responsive disease and resistant disease, probably due to an upregulated nuclear factor kappa B (NF-kB) and SCN1A loss of function.
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Affiliation(s)
- Renata Parissi Buainain
- Laboratory of Cell and Molecular Tumor Biology and Bioactive Compounds, São Francisco University, Bragança Paulista 12916-900, SP, Brazil or (F.A.L.M.)
- Laboratory of Molecular Biology and Genetics, São Francisco University, Bragança Paulista 12916-900, SP, Brazil
| | - André Rodrigues Sodré
- Laboratory of Cell and Molecular Tumor Biology and Bioactive Compounds, São Francisco University, Bragança Paulista 12916-900, SP, Brazil or (F.A.L.M.)
- Laboratory of Molecular Biology and Genetics, São Francisco University, Bragança Paulista 12916-900, SP, Brazil
| | - Jéssica Silva dos Santos
- Laboratory of Cell and Molecular Tumor Biology and Bioactive Compounds, São Francisco University, Bragança Paulista 12916-900, SP, Brazil or (F.A.L.M.)
- Laboratory of Molecular Biology and Genetics, São Francisco University, Bragança Paulista 12916-900, SP, Brazil
| | - Karen Antonia Girotto Takazaki
- Laboratory of Cell and Molecular Tumor Biology and Bioactive Compounds, São Francisco University, Bragança Paulista 12916-900, SP, Brazil or (F.A.L.M.)
- Laboratory of Molecular Biology and Genetics, São Francisco University, Bragança Paulista 12916-900, SP, Brazil
| | - Luciano de Souza Queiroz
- Department of Pathology, Faculty of Medical Science, University of Campinas, Campinas 13083-970, SP, Brazil;
| | - Carlos Tadeu Parisi de Oliveira
- Laboratory of Cell and Molecular Tumor Biology and Bioactive Compounds, São Francisco University, Bragança Paulista 12916-900, SP, Brazil or (F.A.L.M.)
- Laboratory of Molecular Biology and Genetics, São Francisco University, Bragança Paulista 12916-900, SP, Brazil
- São Francisco University Hospital, São Francisco University, Bragança Paulista 20210-030, SP, Brazil
| | - Paulo Henrique Pires de Aguiar
- Laboratory of Cell and Molecular Tumor Biology and Bioactive Compounds, São Francisco University, Bragança Paulista 12916-900, SP, Brazil or (F.A.L.M.)
- Laboratory of Molecular Biology and Genetics, São Francisco University, Bragança Paulista 12916-900, SP, Brazil
- Department of Neurosurgery, Hospital Santa Paula, São Paulo 04556-100, SP, Brazil
| | - Fernando Augusto Lima Marson
- Laboratory of Cell and Molecular Tumor Biology and Bioactive Compounds, São Francisco University, Bragança Paulista 12916-900, SP, Brazil or (F.A.L.M.)
- Laboratory of Molecular Biology and Genetics, São Francisco University, Bragança Paulista 12916-900, SP, Brazil
| | - Manoela Marques Ortega
- Laboratory of Cell and Molecular Tumor Biology and Bioactive Compounds, São Francisco University, Bragança Paulista 12916-900, SP, Brazil or (F.A.L.M.)
- Laboratory of Molecular Biology and Genetics, São Francisco University, Bragança Paulista 12916-900, SP, Brazil
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Zhou Z, Wu S, Zou X, Gu S. Association between SCN1A polymorphism and risk of epilepsy in children: A systematic review and meta-analysis. Seizure 2023; 112:40-47. [PMID: 37741152 DOI: 10.1016/j.seizure.2023.09.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 08/28/2023] [Accepted: 09/14/2023] [Indexed: 09/25/2023] Open
Abstract
Epilepsy is a common neurological disorder in children. Numerous studies have demonstrated the association between SCN1A polymorphisms and risk of epilepsy in adults, but their role in epilepsy in children has just gained traction and results have remained inconsistent. In this work, we performed a systematic review and meta-analysis to assess the association between SCN1A polymorphisms and risk for epilepsy in children. A systematic literature search was performed in PubMed, Scopus, Web of Science, China National Knowledge Internet, Wanfang and VIP databases to identify eligible studies up to June 2023. Quantitative data synthesis was then performed under five genetic models: dominant, recessive, homozygous, heterozygous, and allele. Five studies involving 1380 subjects were included in the meta-analysis. Among many SCN1A polymorphisms reported, only rs2298771 was repeatedly studied in these reports. Pooled analysis demonstrated that there was no significant association between the polymorphism and risk of epilepsy in children (P>0.05). In conclusion, SCN1A rs2298771 polymorphism was not significantly associated with the risk of epilepsy in children.
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Affiliation(s)
- Zhihong Zhou
- School of Nursing, Hebi Polytechnic, Hebi, 458030, China; SeHan University, Yeongam-gun, Jeollanam-do, 58447, Republic of Korea.
| | - Shuihua Wu
- Department of Neurosurgery, Hunan Children's Hospital, Changsha City, 410006, China
| | - Xin Zou
- Department of Neurosurgery, Hunan Children's Hospital, Changsha City, 410006, China
| | - Shuo Gu
- Department of Neurosurgery, The First Affiliated Hospital of Hainan Medical College, Haikou City, 570102, China
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Abduljabbar R, Tamimi DE, Yousef AM. The potential implication of MDR1 and NAC1 genetic polymorphisms on resistance to antiepileptic drugs among a Jordanian epileptic population: a cross-sectional study. Ann Hum Biol 2023; 50:82-93. [PMID: 36714955 DOI: 10.1080/03014460.2023.2173291] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
BACKGROUND Resistance to antiepileptic drugs (AEDs) remains one of the main challenges to neurologists. Polymorphisms of drug efflux transporters such as multidrug resistance (MDR1) gene and target sites such as the nucleus accumbens-associated 1 (NAC1) gene have been suggested to influence the responsiveness to treatment. AIM Evaluation of the association of MDR1 and NAC1 polymorphisms with AEDs resistance among Jordanian epileptic patients. SUBJECTS AND METHODS 86 Jordanian epileptics were included in the study. DNA was extracted and genotyping was conducted by polymerase chain reaction followed by sequencing. Nine single nucleotide polymorphisms (SNPs) on the MDR1 gene and six SNPs on the NAC1 gene were investigated. RESULTS MDR1 and NAC1 polymorphisms don't seem to influence the resistance to AEDs at the genotype or allele level. However, a strong association was found between MDR1 rs2032588 (OR = 5; 95%CI = [1.3-18.8], p = 0.01) and AEDs resistance among males at the allele level. Also, data revealed an association between MDR1 rs1128503 and AEDs resistance among females at the allele level. CONCLUSION The data suggest that MDR1 and NAC1 polymorphisms do not influence the AEDs resistance among Jordanian epileptics. However, there is a gender-dependent association between MDR1 polymorphisms and resistance to AEDs at two SNPs (rs2032588 and rs1128503).
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Affiliation(s)
- Rami Abduljabbar
- Department of Biopharmaceutics and Clinical Pharmacy, School of Pharmacy, The University of Jordan, Amman, Jordan
| | - Duaa Eid Tamimi
- Department of Pharmacology, School of Medicine, The University of Jordan, Amman, Jordan
| | - Al-Motassem Yousef
- Department of Biopharmaceutics and Clinical Pharmacy, School of Pharmacy, The University of Jordan, Amman, Jordan
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Polymorphisms Affecting the Response to Novel Antiepileptic Drugs. Int J Mol Sci 2023; 24:ijms24032535. [PMID: 36768858 PMCID: PMC9917302 DOI: 10.3390/ijms24032535] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2022] [Revised: 01/25/2023] [Accepted: 01/26/2023] [Indexed: 02/03/2023] Open
Abstract
Epilepsy is one of the most frequent chronic neurologic disorders that affects nearly 1% of the population worldwide, especially in developing countries. Currently, several antiepileptic drugs (AEDs) are available for its therapy, and although the prognosis is good for most patients, 20%-30% amongst them do not reach seizure freedom. Numerous factors may explain AED-resistance such as sex, age, ethnicity, type of seizure, early epilepsy onset, suboptimal dosing, poor drug compliance, alcohol abuse, and in particular, genetic factors. Specifically, the interindividual differences in drug response can be caused by single nucleotide polymorphisms (SNPs) in genes encoding for drug efflux transporters, for the brain targets of AEDs, and for enzymes involved in drug metabolism. In this review, we used the PubMed database to retrieve studies that assessed the influence of SNPs on the pharmacokinetic (PK), pharmacodynamic (PD), and efficacy of new antiepileptic drugs. Our results showed that polymorphisms in the ABCB1, ABCC2, UGT1A4, UGT2B7, UGT2B15, CYP2C9, and CYP2C19 genes have an influence on the PK and efficacy of AEDs, suggesting that a genetic pre-evaluation of epileptic patients could help clinicians in prescribing a personalized treatment to improve the efficacy and the safety of the therapy.
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Lin CH, Ho CJ, Lu YT, Tsai MH. Response to Sodium Channel blocking Antiseizure medications and coding polymorphisms of Sodium Channel genes in Taiwanese epilepsy patients. BMC Neurol 2021; 21:367. [PMID: 34556045 PMCID: PMC8459515 DOI: 10.1186/s12883-021-02395-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2021] [Accepted: 09/06/2021] [Indexed: 11/13/2022] Open
Abstract
Background Many antiseizure medications (ASMs) control seizures by blocking voltage-dependent sodium channels. Polymorphisms of sodium channel genes may affect the response to ASMs due to altering the effect of ASMs on blocking sodium channels. Methods We conducted a retrospective study of epilepsy patients followed up at the Neurological Department of Kaohsiung Chang Gung Memorial Hospital, Taiwan between January 2010 and December 2018. We categorized the patients into response, partial response, and failure to sodium channel blocking ASM groups. Sodium channel blocking ASMs included phenytoin, carbamazepine, lamotrigine, oxcarbazepine, lacosamide, zonisamide, topiramate, and valproic acid. A subgroup of predominant sodium channel blocking ASMs included phenytoin, carbamazepine, lamotrigine, oxcarbazepine, and lacosamide. Associations between the response of ASMs and single-nucleotide polymorphisms of SCN1A, SCN1B, SCN2A, and SCN9A were analyzed. Results Two hundred Taiwanese patients and 21 single-nucleotide polymorphisms among SCN1A, SCN1B, SCN2A, and SCN9A were evaluated. We found allele C of rs55742440 in SCN1B was statistically significantly associated with not achieving seizure-free with sodium channel blocking ASMs. For the predominant sodium channel blocking ASMs group, no SNPs were associated with the response of ASMs. Conclusion Single-nucleotide polymorphism in SCN1B was associated with the response to sodium channel blocking ASMs. This highlights the possibility that beta subunits may affect the function of sodium channels and resulted in different responsiveness to ASMs. Supplementary Information The online version contains supplementary material available at 10.1186/s12883-021-02395-2.
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Affiliation(s)
- Chih-Hsiang Lin
- Department of Neurology, Kaohsiung Chang Gung Memorial Hospital, Colleague of Medicine, Chang Gung University, Kaohsiung, Kaohsiung City, 83301, Taiwan
| | - Chen-Jui Ho
- Department of Neurology, Kaohsiung Chang Gung Memorial Hospital, Colleague of Medicine, Chang Gung University, Kaohsiung, Kaohsiung City, 83301, Taiwan
| | - Yan-Ting Lu
- Department of Neurology, Kaohsiung Chang Gung Memorial Hospital, Colleague of Medicine, Chang Gung University, Kaohsiung, Kaohsiung City, 83301, Taiwan
| | - Meng-Han Tsai
- Department of Neurology, Kaohsiung Chang Gung Memorial Hospital, Colleague of Medicine, Chang Gung University, Kaohsiung, Kaohsiung City, 83301, Taiwan. .,School of Medicine, College of Medicine, Chang Gung University, Taoyuan, Taiwan.
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Hao J, Liu H, Ma J, Liu G, Dong G, Liu P, Xiao F. SCN1A IVS5N+5 G>A Polymorphism and Risk of Febrile Seizure and Epilepsy: A Systematic Review and Meta-Analysis. Front Neurol 2021; 11:581539. [PMID: 33391151 PMCID: PMC7773848 DOI: 10.3389/fneur.2020.581539] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Accepted: 10/30/2020] [Indexed: 01/11/2023] Open
Abstract
Background: Previous studies had investigated the association between polymorphism of IVS5N+5 G>A in SCN1A and the risk of febrile seizure and epilepsy. However, the results were inconsistent. We aimed to conduct a systematic review and meta-analysis to evaluate the association between SCN1A IVS5N+5 G>A polymorphism and risk of febrile seizures and epilepsy. Methods: We searched Embase, Medline, Scopus, and CNKI for studies on the association between SCN1A IVS5N+5 G>A polymorphism and risk of febrile seizures and epilepsy up to 19 February 2020. We pooled odds ratios (ORs) and 95% confidence intervals (CIs) by different genetic models. To explore the source of heterogeneity, we performed the subgroup analysis by ethnicity and source of control. Results: We included a total of 12 studies in the meta-analysis. We found a significant negative association between G allele SCN1A IVS5N+5 G>A polymorphism, febrile seizures [G vs. A: OR (95% CI): 0.690 (0.530-0.897); GG vs. AA: 0.503 (0.279-0.908); AG vs. AA: 0.581 (0.460-0.733); GG + AG vs. AA: 0.543 (0.436-0.677); AA + GG vs. AG: 1.309 (1.061-1.615)], and epilepsy [G vs. A: 0.822 (0.750-0.902); GG vs. AA: 0.655 (0.515-0.832); AG vs. AA: 0.780 (0.705-0.862); GG vs. AG + AA: 0.769 (0.625-0.947); GG + AG vs. AA: 0.743 (0.663-0.833); AA + GG vs. AG: 1.093 (1.001-1.193)]. The subgroup analysis shows the association varied by type of disease, ethnicity, and source of control. Conclusion: The present meta-analysis suggests that G allele in SCN1A IVS5N+5 G>A polymorphism is a protective factor of febrile seizures and epilepsy. It is possible to determine the vulnerability of each individual to develop febrile seizures or epilepsy genotype by these genetic variants. Future studies with better study designs are needed to confirm the results. Study Registration: This study was registered in the International Prospective register of systematic reviews (PROSPERO, CRD42020163318).
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Affiliation(s)
- Jindou Hao
- Department of Paediatrics, The First Affiliated Hospital of Jinan University, Guangzhou, China.,Department of Paediatrics, Affiliated Shenzhen Maternity and Child Healthcare Hospital, Southern Medical University, Shenzhen, China
| | - Haiying Liu
- Department of Paediatrics, Affiliated Shenzhen Maternity and Child Healthcare Hospital, Southern Medical University, Shenzhen, China
| | - Jiying Ma
- Department of Occupational Health Surveillance, Shenzhen Prevention and Treatment Center for Occupational Diseases, Shenzhen, China
| | - Guosheng Liu
- Department of Paediatrics, The First Affiliated Hospital of Jinan University, Guangzhou, China
| | - Guoqing Dong
- Department of Paediatrics, Affiliated Shenzhen Maternity and Child Healthcare Hospital, Southern Medical University, Shenzhen, China
| | - Peihui Liu
- Department of Paediatrics, Affiliated Shenzhen Maternity and Child Healthcare Hospital, Southern Medical University, Shenzhen, China
| | - Fei Xiao
- Department of Paediatrics, Affiliated Shenzhen Maternity and Child Healthcare Hospital, Southern Medical University, Shenzhen, China
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The role of chronobiology in drug-resistance epilepsy: The potential use of a variability and chronotherapy-based individualized platform for improving the response to anti-seizure drugs. Seizure 2020; 80:201-211. [DOI: 10.1016/j.seizure.2020.06.032] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Revised: 06/27/2020] [Accepted: 06/30/2020] [Indexed: 12/16/2022] Open
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Huilei X, Siyu C, Jianghua X, Jidong R, Yi R. Clinical utility of pharmacogenetic testing in the treatment of bipolar disorder of Chinese patients. Pharmacogenomics 2020; 21:761-770. [PMID: 32597302 DOI: 10.2217/pgs-2020-0050] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Aim: The purpose of this study was to evaluate the clinical utility of pharmacogenetic (PGx) testing in the treatment of bipolar disorder in the Chinese population. Patients & methods: Compare efficacy and side effects, measured by the Clinical Global Impression Efficacy Index scale (CGI-EI), of PGx-guided treatment (n = 100) to that of the traditional treatment (n = 100). Results: Compared with the traditional treatment, PGx-guided treatment reduced the number of medications used for patients, also achieving better efficacy at 4, 8 and 12 weeks. In the analysis of side effects, the PGx-guided group significantly reduced the side effects. Conclusion: Our study suggests that PGx testing results-guided treatment is superior to the traditional treatment of bipolar disorder in the Chinese population.
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Affiliation(s)
- Xu Huilei
- Nanchong Psychosomatic Hospital, Nanchong, 637700, China
| | - Chen Siyu
- Nanchong Psychosomatic Hospital, Nanchong, 637700, China
| | - Xu Jianghua
- Nanchong Psychosomatic Hospital, Nanchong, 637700, China
| | - Ren Jidong
- Nanchong Psychosomatic Hospital, Nanchong, 637700, China
| | - Ren Yi
- Nanchong Psychosomatic Hospital, Nanchong, 637700, China
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9
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Ratri DMN, Rahmadi M, Islamiyah WR, Harum NF. Overview of therapeutic changes in antiepileptic drugs in adult patients. J Basic Clin Physiol Pharmacol 2020; 30:/j/jbcpp.ahead-of-print/jbcpp-2019-0346/jbcpp-2019-0346.xml. [PMID: 31926092 DOI: 10.1515/jbcpp-2019-0346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2019] [Accepted: 11/22/2019] [Indexed: 06/10/2023]
Abstract
Background Previous studies suggest a highly variable response of antiepileptic drugs (AEDs). This may be because the response to AEDs has been changed to sustained period of freedom from seizures. This study was conducted to determine whether therapeutic changes of AEDs in the treatment of seizure would be observable in an Indonesian population. Methods The study was conducted at the outpatient neurology polyclinic at the Universitas Airlangga Hospital, Surabaya, Indonesia. This was an observational retrospective cohort study, examining the outcomes of 41 cases of switching AEDs (increase or decrease of the dose, switch to branded or generic, or added or reduced type of AEDs). Results After treatment with the switched AED, seizure did not show any significant improvement. However, the incidence of seizure during and after the therapeutic change showed a downward trend (from 44% to 32%). Conclusions According to the present study, mere optimization of antiepileptic therapy may not result in a steep decrease in seizure events, particularly in polytherapy with AEDs. On the other hand, monotherapy with AEDs evidences to decreasing tendency of seizures.
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Affiliation(s)
- Dinda M N Ratri
- Universitas Airlangga, Clinical Pharmacy Department, Faculty of Pharmacy, Surabaya, East Java, Indonesia
| | - Mahardian Rahmadi
- Universitas Airlangga, Clinical Pharmacy Department, Faculty of Pharmacy, Surabaya, East Java, Indonesia
- Universitas Airlangga, Clinical Pharmacy Department, Surabaya, East Java, Indonesia
| | - Wardah R Islamiyah
- Universitas Airlangga, Neurology Department, Faculty of Medicine, Surabaya, East Java, Indonesia
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Markovic I, Pejanovic-Skobic N, Bozina N, Susak Sporis I, Sporis D, Basic S. The lack of influence of IVS5-91 G>A polymorphism of the SCN1A gene on efficacy of lamotrigine in patients with focal epilepsy. Neurol Res 2019; 41:930-935. [PMID: 31256750 DOI: 10.1080/01616412.2019.1635321] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Background: IVS5-91G>A (rs3812718) polymorphism of the sodium voltage-gated channel alpha subunit 1 (SCN1A) gene has been associated with inadequate responsiveness to common antiepileptic drugs which act as sodium channel blockers. This study was performed to investigate the effect of IVS5-91G>A (rs3812718) polymorphism on lamotrigine (LTG) efficacy in a cohort of patients with non-lesional focal epilepsy taking LTG as monotherapy. Methods: A total of 100 of patients with non-lesional focal epilepsy on LTG monotherapy was included in this prospective interventional study. After reaching a stable dose of LTG patients were followed-up for 12 consecutive months. LTG responsiveness was defined as a 75% or more reduction in seizure frequency on a stable dose of LTG. Genotyping was performed at the end of the study using standard procedures and data were correlated with clinical data. Results: There were no significant differences in the prevalence of responsiveness to LTG between carriers of different genotypes. Average maintenance LTG doses in the responder group differed by genotype in the order AA>GA>GG, but these differences did not reach statistical significance. Conclusion: Our data suggest lack of association between SCN1A IVS5-91G>A (rs3812718) polymorphism and response to LTG.
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Affiliation(s)
- Ivana Markovic
- Department of Neurology, University hospital Dubrava , Zagreb , Croatia.,Faculty of Dental Medicine and Health, J.J.Strossmayer University , Osijek , Croatia
| | | | - Nada Bozina
- Division of Pharmacogenomics and Therapy Individualization, Department of Laboratory Diagnostics, University Hospital Center Zagreb , Zagreb , Croatia.,Department of Pharmacology, Zagreb University School of Medicine , Zagreb , Croatia
| | - Ivana Susak Sporis
- Department of Neurology, University hospital Dubrava , Zagreb , Croatia.,Faculty of Dental Medicine and Health, J.J.Strossmayer University , Osijek , Croatia
| | - Davor Sporis
- Department of Neurology, University hospital Dubrava , Zagreb , Croatia.,Faculty of Dental Medicine and Health, J.J.Strossmayer University , Osijek , Croatia
| | - Silvio Basic
- Department of Neurology, University hospital Dubrava , Zagreb , Croatia.,Faculty of Dental Medicine and Health, J.J.Strossmayer University , Osijek , Croatia
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Association between SCN1A polymorphism rs3812718 and valproic acid resistance in epilepsy children: a case-control study and meta-analysis. Biosci Rep 2018; 38:BSR20181654. [PMID: 30413604 PMCID: PMC6435549 DOI: 10.1042/bsr20181654] [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: 09/18/2018] [Revised: 10/31/2018] [Accepted: 11/05/2018] [Indexed: 01/08/2023] Open
Abstract
Resistance to valproic acid (VPA), a first-line antiepileptic drug (AED), is occurring at an alarming rate, particularly in children. Signal nucleotide polymorphisms are considered crucial in this process. Therefore, we investigated whether the SCN1A polymorphism rs3812718 could be associated with VPA resistance. A total of 231 children with epilepsy who were solely administered VPA were enrolled. DNA was extracted from the peripheral blood samples and was genotyped by the Mass Array method. Furthermore, a meta-analysis was conducted between the drug responsive and resistant patients who were exposed to voltage-gated sodium channels. Results revealed that the TT genotype was associated with a higher risk of developing drug resistance (OR = 2.636, 95% CI 1.08–6.433, P = 0.033). After adjusting for the risk factors, a significant difference was still observed between the responsive and resistant groups (OR = 2.861, 95% CI 1.141–7.174, P = 0.025). Moreover, the recessive model was associated with a decreased drug resistance (OR = 0.402, 95% CI 0.167–0.968, P = 0.042) after correcting the risk factors. Meta-analysis of nine studies revealed similar results. In conclusion, our results proved that the rs3812718 TT genotype was associated with a high risk of developing drug resistance, and the recessive model could decrease the risk of VPA resistance.
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12
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Zhi H, Wu C, Yang Z. SCN1A rs3812718 polymorphism is associated with epilepsy: An updated meta-analysis. Epilepsy Res 2018; 142:81-87. [DOI: 10.1016/j.eplepsyres.2018.03.016] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Revised: 03/10/2018] [Accepted: 03/24/2018] [Indexed: 12/18/2022]
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