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1.
Genes (Basel) ; 15(8)2024 Aug 10.
Artigo em Inglês | MEDLINE | ID: mdl-39202414

RESUMO

Current therapy in chronic myeloid leukemia (CML) has improved patient life expectancy close to that of healthy individuals. However, molecular alterations other than BCR::ABL1 fusion gene in CML are barely known. MicroRNAs are important regulators of gene expression, and variants in some of the components of microRNA biosynthesis pathways have been associated with genetic susceptibility to different types of cancer. Thus, the aim of this study was to evaluate the association of variants located in genes involved in the biogenesis of microRNAs with susceptibility to CML. Fifteen variants in eight genes involved in the biogenesis of miRNAs were genotyped in 296 individuals with CML and 485 healthy participants using TaqMan probes. The association of gene variants with CML and clinical variables was evaluated by a Chi-square test, and odds ratios and 95% confidence intervals were estimated by logistic regression. The variant rs13078 in DICER1 was significantly higher among CML individuals than in healthy participants. In addition, the variants rs7813 and rs2740349 were significantly associated with worse prognosis, according to their Hasford scores, whereas the rs2740349 variant was also associated with a later age at diagnosis. These findings suggest that variants in components of the microRNA biogenesis pathway could be involved in CML genetic risk.


Assuntos
RNA Helicases DEAD-box , Leucemia Mielogênica Crônica BCR-ABL Positiva , MicroRNAs , Polimorfismo de Nucleotídeo Único , Ribonuclease III , Humanos , Leucemia Mielogênica Crônica BCR-ABL Positiva/genética , MicroRNAs/genética , Feminino , Masculino , Pessoa de Meia-Idade , Ribonuclease III/genética , Adulto , RNA Helicases DEAD-box/genética , Idoso , Predisposição Genética para Doença , Estudos de Casos e Controles , Prognóstico
2.
Genes (Basel) ; 14(10)2023 10 07.
Artigo em Inglês | MEDLINE | ID: mdl-37895262

RESUMO

Parkinson's disease (PD) pathophysiology includes mitochondrial dysfunction, neuroinflammation, and aging as its biggest risk factors. Mitochondrial DNA copy number (mtDNA-CN) and telomere length (TL) are biological aging markers with inconclusive results regarding their association with PD. A case-control study was used to measure TL and mtDNA-CN using qPCR in PBMCs. PD patients were naive at baseline (T0) and followed-up at one (T1) and two (T2) years after the dopaminergic treatment (DRT). Plasmatic cytokines were determined by ELISA in all participants, along with clinical parameters of patients at T0. While TL was shorter in patients vs. controls at all time points evaluated (p < 0.01), mtDNA-CN showed no differences. An increase in mtDNA-CN and TL was observed in treated patients vs. naive ones (p < 0.001). Our statistical model analyzed both aging markers with covariates, showing a strong correlation between them (r = 0.57, p < 0.01), and IL-17A levels positively correlating with mtDNA-CN only in untreated patients (r = 0.45, p < 0.05). TL and mtDNA-CN could be useful markers for monitoring inflammation progression or treatment response in PD. DRT might modulate TL and mtDNA-CN, reflecting a compensatory mechanism to counteract mitochondrial dysfunction in PD, but this needs further investigation.


Assuntos
DNA Mitocondrial , Doença de Parkinson , Humanos , DNA Mitocondrial/genética , Estudos de Casos e Controles , Variações do Número de Cópias de DNA/genética , Doença de Parkinson/genética , Telômero/genética , Mitocôndrias/genética , Biomarcadores
3.
Pharmacogenomics ; 24(9): 489-492, 2023 06.
Artigo em Inglês | MEDLINE | ID: mdl-37529900

RESUMO

The Ibero-American Network of Pharmacogenetics and Pharmacogenomics (RIBEF) studies Latin American populations to benefit from the implementation of personalized medicine. Since 2006, it has studied ethnicity to apply pharmacogenetics knowledge in autochthonous populations of Latin America, considering ancestral medicine. The meeting 'Pharmacogenetics: ethnicity, Treatment and Health in Latin American Populations' was held in Mexico City, Mexico, and presented the relevance of RIBEF collaboration with Latin American researchers and the governments of Mexico, Spain and the Autonomous Community of Extremadura. The results of 17 years of uninterrupted work by RIBEF, the Declaration of Mérida/T'Hó and the call for the Dr José María Cantú Award for studies focused on the pharmacogenetics of native populations in Latin America were presented.


Assuntos
Etnicidade , Farmacogenética , Humanos , Etnicidade/genética , América Latina/epidemiologia , México/epidemiologia , Farmacogenética/métodos , Medicina de Precisão
4.
Braz. J. Psychiatry (São Paulo, 1999, Impr.) ; Braz. J. Psychiatry (São Paulo, 1999, Impr.);45(2): 117-126, Mar.-Apr. 2023. tab, graf
Artigo em Inglês | LILACS-Express | LILACS | ID: biblio-1439560

RESUMO

Objective: The clinical trajectories of patients with psychotic disorders have divergent outcomes, which may result in part from glutathione (GSH)-related high-risk genotypes. We aimed to determine pharmacokinetics of clozapine, GSH levels, GSH peroxidase (GPx) activity, gene variants involved in the synthesis and metabolism of GSH, and their association with psychotic disorders in Mexican patients on clozapine monotherapy and controls. Methods: The sample included 75 patients with psychotic disorders on clozapine therapy and 40 paired healthy controls. Plasma clozapine/N-desmethylclozapine, GSH concentrations, and GPx activity were determined, along with genotyping of GCLC and GSTP1 variants and copy number variations of GSTP1, GSTT1, and GSTM1. Clinical, molecular and biochemical data were analyzed with a logistic regression model. Results: GSH levels were significantly reduced and, conversely, GPx activity was higher among patients than controls. GCLC_GAG-7/9 genotype (OR = 4.3, 95%CI = 1.40-14.31, p = 0.019) and hetero-/homozygous genotypes of GCLC_rs761142 (OR = 6.09, 95%CI = 1.93-22.59, p = 0.003) were found to be risk factors for psychosis. The genetic variants were not related to clozapine/N-desmethylclozapine levels or metabolic ratio. Conclusions: GCLC variants were associated with the oxidative stress profile of patients with psychotic disorders, raising opportunities for intervention to improve their antioxidant defenses. Further studies with larger samples should explore this proposal.

5.
Braz J Psychiatry ; 45(2): 117-126, 2023 May 11.
Artigo em Inglês | MEDLINE | ID: mdl-36318479

RESUMO

OBJECTIVE: The clinical trajectories of patients with psychotic disorders have divergent outcomes, which may result in part from glutathione (GSH)-related high-risk genotypes. We aimed to determine pharmacokinetics of clozapine, GSH levels, GSH peroxidase (GPx) activity, gene variants involved in the synthesis and metabolism of GSH, and their association with psychotic disorders in Mexican patients on clozapine monotherapy and controls. METHODS: The sample included 75 patients with psychotic disorders on clozapine therapy and 40 paired healthy controls. Plasma clozapine/N-desmethylclozapine, GSH concentrations, and GPx activity were determined, along with genotyping of GCLC and GSTP1 variants and copy number variations of GSTP1, GSTT1, and GSTM1. Clinical, molecular and biochemical data were analyzed with a logistic regression model. RESULTS: GSH levels were significantly reduced and, conversely, GPx activity was higher in PD patients compared to controls. GCLC_GAG-7/9 genotype (OR=4.3, CI95=1.40-14.31, p=0.019) and hetero-/homozygous genotypes of GCLC_rs761142 (OR=6.09, CI95=1.93-22.59, p=0.003) were found as risk factors for psychosis. The genetic variants were not related to clozapine/N-desmethylclozapine levels or to metabolic ratio. CONCLUSIONS: GCLC variants were associated with the oxidative stress profile of PD patients raising opportunities for intervention to improve their antioxidant defenses. Further studies with larger samples should explore this proposal.


Assuntos
Clozapina , Transtornos Psicóticos , Humanos , Polimorfismo Genético , Clozapina/uso terapêutico , Variações do Número de Cópias de DNA , Genótipo , Estresse Oxidativo/genética , Glutationa/genética , Glutationa/metabolismo , Antioxidantes , Transtornos Psicóticos/tratamento farmacológico , Transtornos Psicóticos/genética , Predisposição Genética para Doença , Estudos de Casos e Controles
6.
Curr Microbiol ; 79(11): 353, 2022 Oct 08.
Artigo em Inglês | MEDLINE | ID: mdl-36209248

RESUMO

Pseudomonas aeruginosa has a high adaptive capacity, favoring the selection of antibiotic-resistant strains, which are currently considered a global health problem. The purpose of this work was to investigate the rate and distribution of extensively drug-resistant (XDR) P. aeruginosa in pediatric patients with cystic fibrosis (CF) with recurrent infections and to distinguish the current efficacy of antibiotics commonly used in eradication therapy at a Mexican institute focused on children. A total of 118 P. aeruginosa isolates from 25 children with CF (2015-2019) underwent molecular identification, antimicrobial sensitivity tests, and Random Amplified Polymorphic DNA genotyping (RAPD-PCR). The bacterial isolates were grouped in 84 RAPD profiles, revealing a cross-infection between two sisters, whose resistance profile remained unchanged for more than 2 years. Furthermore, 77.1% (91/118) and 51.7% (61/118) of isolates showed in vitro susceptibility to ceftazidime and amikacin, respectively, antibiotics often used in eradication therapy at our institution. As well, 42.4% (50/118) were categorized as multi-drug resistant (MDR) and 12.7% (15/118) were XDR. Of these resistant isolates, 84.6% (55/65) were identified from patients with recurrent infections. The high frequency of XDR strains in children with CF should be considered a caution mark, as such resistance patterns are more commonly found in adult patients. Additionally, amikacin may soon prove ineffective. Careful use of available antibiotics is crucial before therapeutic possibilities are reduced and "antibiotic resistance crisis" worsens.


Assuntos
Fibrose Cística , Infecções por Pseudomonas , Adulto , Amicacina/farmacologia , Antibacterianos/farmacologia , Antibacterianos/uso terapêutico , Ceftazidima/farmacologia , Ceftazidima/uso terapêutico , Criança , Fibrose Cística/complicações , Fibrose Cística/microbiologia , Humanos , Testes de Sensibilidade Microbiana , Infecções por Pseudomonas/tratamento farmacológico , Infecções por Pseudomonas/microbiologia , Pseudomonas aeruginosa , Técnica de Amplificação ao Acaso de DNA Polimórfico , Reinfecção
7.
Front Psychiatry ; 13: 870656, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35664466

RESUMO

Long-term studies have shown significantly lower mortality rates in patients with continuous clozapine (CLZ) treatment than other antipsychotics. We aimed to evaluate epigenetic age and DNA methylome differences between CLZ-treated patients and those without psychopharmacological treatment. The DNA methylome was analyzed using the Infinium MethylationEPIC BeadChip in 31 CLZ-treated patients with psychotic disorders and 56 patients with psychiatric disorders naive to psychopharmacological treatment. Delta age (Δage) was calculated as the difference between predicted epigenetic age and chronological age. CLZ-treated patients were stratified by sex, age, and years of treatment. Differential methylation sites between both groups were determined using linear regression models. The Δage in CLZ-treated patients was on average lower compared with drug-naive patients for the three clocks analyzed; however, after data-stratification, this difference remained only in male patients. Additional differences were observed in Hannum and Horvath clocks when comparing chronological age and years of CLZ treatment. We identified 44,716 differentially methylated sites, of which 87.7% were hypomethylated in CLZ-treated patients, and enriched in the longevity pathway genes. Moreover, by protein-protein interaction, AMPK and insulin signaling pathways were found enriched. CLZ could promote a lower Δage in individuals with long-term treatment and modify the DNA methylome of the longevity-regulating pathways genes.

8.
Pharmacogenomics ; 23(6): 371-392, 2022 04.
Artigo em Inglês | MEDLINE | ID: mdl-35311547

RESUMO

Clozapine (CLZ) is an atypical antipsychotic reserved for patients with refractory psychosis, but it is associated with a significant risk of severe adverse reactions (ADRs) that are potentiated with the concomitant use of alcohol. Additionally, pharmacogenetic studies have explored the influence of several genetic variants in CYP450, receptors and transporters involved in the interindividual response to CLZ. Herein, we systematically review the current multiomics knowledge behind the interaction between CLZ and alcohol intake, and how its concomitant use might modulate the pharmacogenetics. CYP1A2*1F, *1C and other alleles not yet discovered could support a precision medicine approach for better therapeutic effects and fewer CLZ ADRs. CLZ monitoring systems should be amended and include alcohol intake to protect patients from severe CLZ ADRs.


Assuntos
Antipsicóticos , Clozapina , Efeitos Colaterais e Reações Adversas Relacionados a Medicamentos , Esquizofrenia , Consumo de Bebidas Alcoólicas/efeitos adversos , Consumo de Bebidas Alcoólicas/genética , Antipsicóticos/efeitos adversos , Clozapina/efeitos adversos , Humanos , Farmacogenética , Esquizofrenia/tratamento farmacológico , Esquizofrenia/genética
9.
Pharmacogenomics ; 22(15): 983-996, 2021 10.
Artigo em Inglês | MEDLINE | ID: mdl-34612084

RESUMO

Aim: We evaluated the potential influence of genetic (CYP3A5, EPHX1, NR1I2, HNF4A, ABCC2, RALBP1, SCN1A, SCN2A and GABRA1) and nongenetic factors on carbamazepine (CBZ) response, adverse drug reactions and CBZ plasma concentrations in 126 Mexican Mestizos (MM) with epilepsy. Subjects & methods: Patients were genotyped for 27 variants using TaqMan® assays. Results: CBZ response was associated with NR1I2 variants and lamotrigine cotreatment. CBZ-induced adverse drug reactions were related to antiepileptic polytherapy and SCN1A rs2298771/rs3812718 haplotype. CBZ plasma concentrations were influenced by NR1I2-rs2276707 and -rs3814058, and by phenytoin cotreatment. CBZ daily dose was also influenced by NR1I2-rs3814055 and EPHX1-rs1051740. Conclusion: Interindividual variability in CBZ treatment was partly explained by NR1I2, EPHX1 and SCN1A variants, as well as antiepileptic cotreatment in MM with epilepsy.


Assuntos
Anticonvulsivantes/uso terapêutico , Carbamazepina/uso terapêutico , Epilepsia/tratamento farmacológico , Epilepsia/genética , Receptor de Pregnano X/genética , Adulto , Anticonvulsivantes/efeitos adversos , Anticonvulsivantes/farmacocinética , Carbamazepina/efeitos adversos , Carbamazepina/farmacocinética , Quimioterapia Combinada , Epóxido Hidrolases/genética , Etnicidade , Feminino , Variação Genética , Humanos , Lamotrigina/efeitos adversos , Lamotrigina/uso terapêutico , Masculino , México , Pessoa de Meia-Idade , Canal de Sódio Disparado por Voltagem NAV1.1/genética , Fenitoína/uso terapêutico , Medicina de Precisão , Centros de Atenção Terciária , Adulto Jovem
10.
Pharmaceuticals (Basel) ; 14(2)2021 Feb 04.
Artigo em Inglês | MEDLINE | ID: mdl-33557049

RESUMO

Clozapine (CLZ) is the only antipsychotic drug that has been proven to be effective in patients with refractory psychosis, but it has also been proposed as an effective mood stabilizer; however, the complex mechanisms of action of CLZ are not yet fully known. To find predictors of CLZ-associated phenotypes (i.e., the metabolic ratio, dosage, and response), we explore the genomic and epigenomic characteristics of 44 patients with refractory psychosis who receive CLZ treatment based on the integration of polygenic risk score (PRS) analyses in simultaneous methylome profiles. Surprisingly, the PRS for bipolar disorder (BD-PRS) was associated with the CLZ metabolic ratio (pseudo-R2 = 0.2080, adjusted p-value = 0.0189). To better explain our findings in a biological context, we assess the protein-protein interactions between gene products with high impact variants in the top enriched pathways and those exhibiting differentially methylated sites. The GABAergic synapse pathway was found to be enriched in BD-PRS and was associated with the CLZ metabolic ratio. Such interplay supports the use of CLZ as a mood stabilizer and not just as an antipsychotic. Future studies with larger sample sizes should be pursued to confirm the findings of this study.

11.
Drug Dev Res ; 82(5): 685-694, 2021 08.
Artigo em Inglês | MEDLINE | ID: mdl-33336447

RESUMO

Clozapine (CLZ) is an atypical antipsychotic and the gold standard for refractory psychosis treatment. However, there is little information regarding pharmacogenetics of CLZ in patients with refractory psychosis and its clinical correlation with alcohol intake. Although neurological effects of CLZ in patients with concomitant alcohol intake are documented, its use is very common in patients with psychosis. We explored the impact of CYP1A2, CYP2D6, CYP2C19, and CYP3A4 genetic variants on CLZ pharmacokinetics and side effects, along with coffee/alcohol/tobacco consumption habits and clinical data of 48 adult patients with refractory psychosis on CLZ antipsychotic monotherapy. Relevant CYP variants in CLZ metabolism were evaluated by targeted genotyping and multiplex ligation-dependent probe amplification. CLZ and its main metabolite plasma concentrations were determined by high performance liquid chromatography. Biochemical and molecular data, along with other potential confounders, were included in the analysis by linear regression. Overall, CYP variants showed no effect on CLZ pharmacokinetics. The rs2069514 variant in homozygous genotype (also known as CYP1A2*1C/*1C) was associated with CLZ adverse reactions in Mexican patients with refractory psychosis (OR = 3.55 CI95  = 1.041-12.269, p = .043) and demonstrated that this effect is doubled by concomitant alcohol consumption (OR = 7.9 CI95  = 1.473-42.369, p = .016). Clinicians should be aware of this information before starting CLZ use, when treating patients with refractory psychosis, who are alcohol drinkers and carriers of this genetic variant in order to prevent CLZ-related adverse reactions. Nevertheless, our findings should be replicated in larger samples.


Assuntos
Consumo de Bebidas Alcoólicas/efeitos adversos , Antipsicóticos/efeitos adversos , Clozapina/efeitos adversos , Citocromo P-450 CYP1A2/genética , Transtornos Psicóticos/tratamento farmacológico , Adulto , Estudos Transversais , Citocromo P-450 CYP1A2/metabolismo , Efeitos Colaterais e Reações Adversas Relacionados a Medicamentos , Feminino , Variação Genética , Genótipo , Humanos , Masculino , Farmacogenética
12.
Front Oncol ; 10: 579561, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-33324556

RESUMO

Retinol plays a significant role in several physiological processes through their nuclear receptors, whose expression depends on retinol cytoplasmic concentration. Loss of expression of nuclear receptors and low retinol levels have been correlated with lung cancer development. Stimulated by retinoic acid 6 (STRA6) is the only described cell membrane receptor for retinol uptake. Some chronic diseases have been linked with specific polymorphisms in STRA6. This study aimed to evaluate four STRA6 single nucleotide polymorphisms (SNPs) (rs4886578, rs736118, rs351224, and rs97445) among 196 patients with locally-advanced and metastatic non-small cell lung cancer (NSCLC) patients. Genotyping, through a validated SNP assay and determined using real time-PCR, was correlated with clinical features and outcomes. NSCLC patients with a TT SNP rs4886578 and rs736118 genotype were more likely to be >60 years, non-smokers, and harboring EGFR mutations. Patients with a TT genotype compared with a CC/CT SNP rs974456 genotype had a median progression-free survival (PFS) of 3.2 vs. 4.8 months, p = 0.044, under a platinum-based regimen in the first-line. Furthermore, patients with a TT rs351224 genotype showed a prolonged overall survival (OS), 47.5 months vs. 32.0 months, p = 0.156. This study showed a correlation between clinical characteristics, such as age, non-smoking history, and EGFR mutational status and oncological outcomes depending on STRA6 SNPs. The STRA6 TT genotype SNP rs4886578 and rs736118 might be potential biomarkers in locally-advanced and metastatic NSCLC patients.

14.
Pharmacogenomics J ; 20(6): 845-856, 2020 12.
Artigo em Inglês | MEDLINE | ID: mdl-32483200

RESUMO

Genetic and nongenetic factors may contribute to lamotrigine (LTG) plasma concentration variability among patients. We simultaneously investigated the association of UGT1A1, UGT1A4, UGT2B7, ABCB1, ABCG2, and SLC22A1 variants, as well as antiepileptic drug co-treatment, on LTG plasma concentration in 97 Mexican Mestizo (MM) patients with epilepsy. UGT1A4*1b was associated with lower LTG dose-corrected concentrations. Patients with the UGT2B7-161T allele were treated with 21.22% higher LTG daily dose than those with CC genotype. Two novel UGT1A4 variants (c.526A>T; p.Thr185= and c.496T>C; p.Ser166Leu) were identified in one patient. Patients treated with LTG + valproic acid (VPA) showed higher LTG plasma concentration than patients did on LTG monotherapy or LTG + inducer. Despite the numerous drug-metabolizing enzymes and transporter genetic variants analyzed, our results revealed that co-treatment with VPA was the most significant factor influencing LTG plasma concentration, followed by UGT1A4*1b, and that patients carrying UGT2B7 c.-161T required higher LTG daily doses. These data provide valuable information for the clinical use of LTG in MM patients with epilepsy.


Assuntos
Anticonvulsivantes/sangue , Epilepsia/sangue , Epilepsia/genética , Indígenas Norte-Americanos/genética , Lamotrigina/sangue , Variantes Farmacogenômicos/genética , Adolescente , Adulto , Idoso , Anticonvulsivantes/administração & dosagem , Quimioterapia Combinada , Epilepsia/tratamento farmacológico , Epilepsia/epidemiologia , Feminino , Humanos , Lamotrigina/administração & dosagem , Masculino , México/epidemiologia , Pessoa de Meia-Idade , Adulto Jovem
15.
Int J Mol Sci ; 20(13)2019 Jul 07.
Artigo em Inglês | MEDLINE | ID: mdl-31284700

RESUMO

Several studies indicate that bisphenol A (BPA) and phthalates may have a role in the development of metabolic diseases using different molecular pathways, including epigenetic regulatory mechanisms. However, it is unclear whether exposure to these chemicals modifies serum levels of miRNAs associated with gestational diabetes mellitus (GDM) risk. In the present study, we evaluated the serum levels of miRNAs associated with GDM (miR-9-5p, miR-16-5p, miR-29a-3p and miR-330-3p) and urinary levels of phthalate metabolites (mono-n-butyl phthalate (MBP), mono-isobutyl phthalate (MiBP), mono-benzyl phthalate (MBzP) and mono(2-ethyl hexyl) phthalate (MEHP)) and bisphenol A in GDM patients and women without GDM during the second trimester of gestation. We observed higher levels of miR-9-5p, miR-29a-3p and miR-330-3p in sera of patients with GDM compared to non-diabetic subjects. Phthalates were detected in 97-100% of urine samples, while BPA only in 40%. Urinary MEHP and BPA concentrations were remarkably higher in both study groups compared to previously reported data. Unadjusted MEHP levels and adjusted BPA levels were higher in non-diabetics than in GDM patients (p = 0.03, p = 0.02). We found positive correlations between adjusted urinary MBzP levels and miR-16-5p expression levels (p < 0.05), adjusted MEHP concentrations and miR-29a-3p expression levels (p < 0.05). We also found negative correlations between unadjusted and adjusted MBP concentrations and miR-29a-3p expression levels (p < 0.0001, p < 0.05), unadjusted MiBP concentrations and miR-29a-3p expression levels (p < 0.01). Urinary MEHP levels reflect a striking exposure to di(2-ethylhexyl) phthalate (DEHP) in pregnant Mexican women. This study highlights the need for a regulatory strategy in the manufacture of several items containing endocrine disruptors in order to avoid involuntary ingestion of these compounds in the Mexican population.


Assuntos
Compostos Benzidrílicos/urina , Diabetes Gestacional/genética , Diabetes Gestacional/urina , Regulação da Expressão Gênica , MicroRNAs/genética , Fenóis/urina , Ácidos Ftálicos/urina , Adulto , Compostos Benzidrílicos/química , Diabetes Gestacional/sangue , Feminino , Humanos , Metaboloma , México , MicroRNAs/sangue , MicroRNAs/metabolismo , Fenóis/química , Ácidos Ftálicos/química , Gravidez , Segundo Trimestre da Gravidez/sangue , Segundo Trimestre da Gravidez/urina , Regulação para Cima/genética
16.
Mol Biol Rep ; 45(6): 2525-2533, 2018 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-30317428

RESUMO

The most widely studied polymorphisms of the ABCB1 gene are rs1128503 (c.1236C>T), rs2032582 (c.2677G>T/A), and rs1045642 (c.3435C>T). Although variation in ABCB1 allele frequencies among Mexican Mestizos (admixed) from different regions has been observed, Mexican Amerindians have been poorly studied. We aimed to describe the genetic variability of these three ABCB1 polymorphisms in a total sample of 273 Mexican volunteers that included Mestizos from the state of Yucatán, and Amerindians from seven populations (Tarahumara, Mayo, Huichol, Purépecha, Nahua, Tojolabal, and Maya). Genotypes were determined by means of Taq Man probes (qPCR). Genotype distribution was in Hardy-Weinberg equilibrium for all three ABCB1polymorphisms in the eight Mexican populations analyzed. For c.1236C>T and c.3435C>T, the heterozygous C/T was the most frequent genotype in the majority of the studied Mexican populations (range 30.8-65.4%), while heterozygous G/T was the most common genotype for c.2677G>T/A (range 25.9-51.2%), mainly followed by G/G (range 3.2-47.1%) and T/T (range 7.0-35.5%). 12 haplotypes were estimated from the three ABCB1 polymorphisms analyzed, with TTT the most frequent haplotype (mean, 37.0%). Genetic differentiation was demonstrated among the studied Mexican populations (Fst p value < 0.0001), which could imply a diverse drug response or a risk for adverse drug reactions to ABCB1 substrates. Although differences among Amerindians are probably due to genetic drift effects, for Mestizos this could imply variation in admixture composition. In conclusion, interpopulation variability in the observed frequencies of ABCB1 polymorphisms among Mexican Mestizos and Amerindians allow predicting diverse drug responses to ABCB1 substrates in these populations.


Assuntos
Indígenas Norte-Americanos/genética , Subfamília B de Transportador de Cassetes de Ligação de ATP/genética , Alelos , Etnicidade/genética , Feminino , Frequência do Gene/genética , Variação Genética/genética , Genótipo , Haplótipos , Humanos , Masculino , México , Polimorfismo de Nucleotídeo Único/genética
17.
Expert Rev Clin Pharmacol ; 11(7): 705-718, 2018 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-29898616

RESUMO

INTRODUCTION: Carbamazepine (CBZ) is used for the treatment of epilepsy and other neurological and psychiatric disorders. The occurrence of adverse reactions (ADRs) to CBZ can negatively impact the quality of life of patients, as well as increase health-care costs. Thus, knowledge of CBZ-induced ADRs is important to achieve safer treatment outcomes. Areas covered: This review describes the clinical features, known mechanisms, and clinical management of the main CBZ-induced ADRs. In addition, pharmacogenetic studies focused on ADRs induced by CBZ are cited. Expert commentary: CBZ-induced ADRs are well known in the literature. The metabolite CBZ-10,11-epoxide plays an important role in the mechanism that underlies the ADRs induced by CBZ. Several factors should be considered for a safer use of CBZ, such as monotherapy prescription when possible, an adequate dose titration, knowledge of previous ADRs in the patient, and routine monitoring of CBZ plasma concentrations in symptomatic patients. Pharmacogenetics is a potential tool for CBZ therapy improvement, and the design of multicenter studies focused on the identification of biomarkers for CBZ-induced ADRs could provide useful information for a safer CBZ therapy.


Assuntos
Anticonvulsivantes/efeitos adversos , Carbamazepina/efeitos adversos , Qualidade de Vida , Anticonvulsivantes/administração & dosagem , Anticonvulsivantes/farmacocinética , Biomarcadores/metabolismo , Carbamazepina/administração & dosagem , Carbamazepina/farmacocinética , Relação Dose-Resposta a Droga , Monitoramento de Medicamentos/métodos , Epilepsia/tratamento farmacológico , Humanos , Farmacogenética/métodos , Projetos de Pesquisa
18.
Pharmacogenomics ; 17(17): 1913-1930, 2016 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-27790929

RESUMO

AIM: To determine allele and genotype frequencies of genes influencing anti-epileptic drug therapy in Mexican-Mestizo (MM) healthy volunteers, and to evaluate whether these are different from those reported for other populations. SUBJECTS & METHODS: Thirty-nine variants of CYP3A5, EPHX1, NR1I2, HNF4A, UGT1A1, UGT2B7, ABCC2, RALBP1, SCN1A, SCN2A and GABRA1 were genotyped in 300 MM healthy volunteers. RESULTS: All studied alleles were presented in MM, except for seven UGT1A1 variants (*6-8, 14, 15, 27 and 29). Allele and genotype frequencies showed interethnic variations when compared with European, Asian and African populations. Allele frequencies of greater than 30% were observed in ten genes. CONCLUSION: The results presented regarding the frequencies and interethnic differences of these polymorphisms should be taken into account for future pharmacogenetic studies of anti-epileptic drugs in MM patients with epilepsy.

19.
J Neurol Sci ; 362: 321-5, 2016 Mar 15.
Artigo em Inglês | MEDLINE | ID: mdl-26944171

RESUMO

INTRODUCTION: The pathophysiology of PD (Parkinson's disease) has been related to the ubiquitin proteasome system and oxidative stress. Parkin acts as ubiquitin ligase on several substrates. Because genetic variants often have different frequencies across populations, population specific analyses are necessary to complement and validate results from genome-wide association studies. METHODS: We carried out an association study with genes coding for parkin substrates and cellular stress components in the Galician population (Northern Spain). SNCA and MAPT SNPs were also analyzed. We studied 75 SNPs in a discovery sample of 268 PD patients and 265 controls from Galicia. A replication sample of 271 patients and 260 controls was recruited from Mexico City. RESULTS: We observed significant association between PD and SNPs in MAPT. Nominal p-values<0.05 were obtained in the Galician cohort for SNPs in SYT11, coding for synaptotagmin XI. These results were replicated in the Mexican sample. DISCUSSION: The associated markers lie within a ~140kb strong linkage disequilibrium segment that harbors several candidate genes, including SYT11. SNPs from the GBA-SYT11-RAB25 region have been previously associated with PD, however the functionally relevant variants remain unknown. Our data support a likely role of genetic factors within 1q22 in PD susceptibility.


Assuntos
Comparação Transcultural , Predisposição Genética para Doença/genética , Doença de Parkinson/genética , Polimorfismo de Nucleotídeo Único/genética , Sinaptotagminas/genética , Idoso , Feminino , Estudos de Associação Genética , Humanos , Masculino , México/epidemiologia , Pessoa de Meia-Idade , Doença de Parkinson/epidemiologia , Espanha/epidemiologia , alfa-Sinucleína/genética , Proteínas tau/genética
20.
Drug Metab Pers Ther ; 31(2): 61-81, 2016 06 01.
Artigo em Inglês | MEDLINE | ID: mdl-26812836

RESUMO

Mexico presents a complex population diversity integrated by Mexican indigenous (MI) (7% of Mexico's population) and Mexican mestizos (MMs). This composition highlights the importance of pharmacogenetic studies in Mexican populations. The aims of this study were to analyze the reported frequencies of the most relevant pharmacogenetic biomarkers and metabolic phenotypes in healthy volunteers from Mexican populations and to assess its interethnic variability across MI and MM populations. After a literature search in PubMed, and according to previously defined inclusion criteria, 63 pharmacogenetic studies performed in Mexican healthy volunteers up to date were selected. These reports comprised 56,292 healthy volunteers (71.58% MM). Allele frequencies in 31 pharmacogenetic biomarkers, from 121 searched, are described. Nine of these biomarkers presented variation within MM and MI groups. The frequencies of CYP2D6*3, *4, *5, *10, *17, *35 and *41 alleles in the MM group were different from those reported in the MI group. CYP2C9*2 and *3 alleles were more frequent in MM than in MI populations (χ2 test, p<0.05). CYP2C19*3 allele was not found in the MM or MI populations reported. For UGT1A1*28, only one study was found. HLA-A*31:01 and HLA-B*15:02 were present in some MM and MI populations. Poor metabolizers for CYP2D6 and CYP2C9 were more frequent in MM than in MI groups (χ2 test, p<0.05). Only 26% of the relevant pharmacogenetic biomarkers searched have been studied in Mexican healthy volunteers; therefore, further studies are warranted. The frequency variation of biomarkers in MM and MI populations could be important for the clinical implementation of pharmacogenetics in Mexico.


Assuntos
Biomarcadores/metabolismo , Sistema Enzimático do Citocromo P-450/genética , Sistema Enzimático do Citocromo P-450/metabolismo , Etnicidade/genética , Voluntários Saudáveis , Humanos , México
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