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1.
Obes Surg ; 30(4): 1482-1490, 2020 04.
Artigo em Inglês | MEDLINE | ID: mdl-31898046

RESUMO

BACKGROUND: Sleeve gastrectomy (SG) and Roux-en-Y gastric bypass (RYGB) are the most frequent bariatric surgery procedures worldwide. In this prospective study, we examined the association of a genetic risk score (GRS) with loss of excess weight after bariatric surgery. METHODS: A total of forty-seven morbidly obese Greek patients who underwent SG (81%) or RYGB were recruited, followed up for 2 years and genotyped. Weight loss after surgery was reported as the percentage of excess weight that was lost (%EWL) at 12 and 24 months after surgery. A GRS was constructed based on previously BMI- and WHR-related single nucleotide polymorphisms (SNPs) that were found significantly correlated with weight loss after bariatric surgery in our population. The level of post-surgery %EWL after 12 and 24 months was estimated through two multiple linear regression models that considered the effects of relevant genetic risk variants. RESULTS: The first proposed model suggested that the predictor variables of GRS, age, and BMI had a significant effect on %EWL12m. GRS was significantly associated with %EWL12m, indicating a 4.618% decrease of %EWL12m per score unit. The second model indicated a positive correlation between %EWL24m and %EWL12m, suggesting that while post-surgery weight loss increased during the first 12 months, an increase was expected in the next 12 months as well. GRS was also significantly associated with %EWL24m, indicating approximately 3% decrease of %EWL24m per score unit. CONCLUSION: GRS can be used in the future together with other preoperative parameters in order to predict the outcome of bariatric surgery.


Assuntos
Cirurgia Bariátrica , Derivação Gástrica , Obesidade Mórbida , Gastrectomia , Humanos , Obesidade Mórbida/cirurgia , Estudos Prospectivos , Estudos Retrospectivos , Fatores de Risco , Resultado do Tratamento , Redução de Peso
2.
Eur J Nutr ; 58(4): 1463-1473, 2019 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-29574608

RESUMO

PURPOSE: Non-alcoholic fatty liver disease (NAFLD) is a complex disease, resulting from a variety of genetic and environmental factors. The aim of this case-control study was to evaluate the effect of selected genetic polymorphisms, nutrition aspects and their interaction on the risk of NAFLD. METHODS: The sample consisted of 134 patients with NAFLD and 217 controls. Disease was diagnosed by liver ultrasound and volunteers were clinically and nutritionally assessed. Food groups were extracted from a 172 food-item FFQ questionnaire. Three genetic polymorphisms were assessed: PNPLA3 rs738409, TM6SF2 rs58542926 and GCKR rs780094. RESULTS: We replicated the effect of previously reported risk factors for NAFLD, such as elevated liver enzymes, obesity and metabolic syndrome. Food groups rich in simple sugars, fat and especially saturated fat were positively associated with NAFLD risk, whereas food groups rich in polyunsaturated fatty acids were reversely associated with the possibility of developing the disease (p < 0.05). Only the PNPLA3 genetic variant was statistically significantly associated with the disease (padditive = 0.015). However, it was found that a one-portion increase in fish intake increased the risk of NAFLD in carriers of the risk allele of TM6SF2 rs58542926 polymorphism compared to non-carriers, after adjusting for age, gender, energy intake, pack-years, PAL, TM6SF2 genotype and fish consumption (ORdominant = 1.503, 95% CI 1.094-2.064). CONCLUSIONS: Fish intake exerts an additive effect on NAFLD risk for carriers of the TM6SF2 polymorphism. This novel finding provides further rationale on the need for personalized nutritional advice, based on the genetic background of NAFLD patients.


Assuntos
Proteínas de Membrana/genética , Hepatopatia Gordurosa não Alcoólica/genética , Polimorfismo de Nucleotídeo Único/genética , Alimentos Marinhos , Adulto , Estudos de Casos e Controles , Feminino , Humanos , Fígado/diagnóstico por imagem , Masculino , Pessoa de Meia-Idade , Avaliação Nutricional , Fatores de Risco , Inquéritos e Questionários , Ultrassonografia
4.
Int J Obes (Lond) ; 42(4): 775-784, 2018 04.
Artigo em Inglês | MEDLINE | ID: mdl-28990592

RESUMO

BACKGROUND: Clinical recommendations to limit gestational weight gain (GWG) imply high GWG is causally related to adverse outcomes in mother or offspring, but GWG is the sum of several inter-related complex phenotypes (maternal fat deposition and vascular expansion, placenta, amniotic fluid and fetal growth). Understanding the genetic contribution to GWG could help clarify the potential effect of its different components on maternal and offspring health. Here we explore the genetic contribution to total, early and late GWG. PARTICIPANTS AND METHODS: A genome-wide association study was used to identify maternal and fetal variants contributing to GWG in up to 10 543 mothers and 16 317 offspring of European origin, with replication in 10 660 mothers and 7561 offspring. Additional analyses determined the proportion of variability in GWG from maternal and fetal common genetic variants and the overlap of established genome-wide significant variants for phenotypes relevant to GWG (for example, maternal body mass index (BMI) and glucose, birth weight). RESULTS: Approximately 20% of the variability in GWG was tagged by common maternal genetic variants, and the fetal genome made a surprisingly minor contribution to explain variation in GWG. Variants near the pregnancy-specific beta-1 glycoprotein 5 (PSG5) gene reached genome-wide significance (P=1.71 × 10-8) for total GWG in the offspring genome, but did not replicate. Some established variants associated with increased BMI, fasting glucose and type 2 diabetes were associated with lower early, and higher later GWG. Maternal variants related to higher systolic blood pressure were related to lower late GWG. Established maternal and fetal birth weight variants were largely unrelated to GWG. CONCLUSIONS: We found a modest contribution of maternal common variants to GWG and some overlap of maternal BMI, glucose and type 2 diabetes variants with GWG. These findings suggest that associations between GWG and later offspring/maternal outcomes may be due to the relationship of maternal BMI and diabetes with GWG.


Assuntos
Feto/fisiologia , Ganho de Peso na Gestação/genética , Gravidez/genética , Feminino , Estudo de Associação Genômica Ampla , Ganho de Peso na Gestação/fisiologia , Humanos , Gravidez/fisiologia , Gravidez/estatística & dados numéricos
5.
Mol Psychiatry ; 23(5): 1169-1180, 2018 05.
Artigo em Inglês | MEDLINE | ID: mdl-29155802

RESUMO

Anorexia nervosa (AN) is a complex neuropsychiatric disorder presenting with dangerously low body weight, and a deep and persistent fear of gaining weight. To date, only one genome-wide significant locus associated with AN has been identified. We performed an exome-chip based genome-wide association studies (GWAS) in 2158 cases from nine populations of European origin and 15 485 ancestrally matched controls. Unlike previous studies, this GWAS also probed association in low-frequency and rare variants. Sixteen independent variants were taken forward for in silico and de novo replication (11 common and 5 rare). No findings reached genome-wide significance. Two notable common variants were identified: rs10791286, an intronic variant in OPCML (P=9.89 × 10-6), and rs7700147, an intergenic variant (P=2.93 × 10-5). No low-frequency variant associations were identified at genome-wide significance, although the study was well-powered to detect low-frequency variants with large effect sizes, suggesting that there may be no AN loci in this genomic search space with large effect sizes.


Assuntos
Anorexia Nervosa/genética , Moléculas de Adesão Celular/genética , Exoma/genética , Família , Feminino , Proteínas Ligadas por GPI/genética , Predisposição Genética para Doença/genética , Variação Genética/genética , Estudo de Associação Genômica Ampla , Genótipo , Humanos , Íntrons/genética , Masculino , Fenótipo , Polimorfismo de Nucleotídeo Único/genética , População Branca/genética
6.
Eur J Nutr ; 56(8): 2457-2466, 2017 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-27459881

RESUMO

PURPOSE: Zinc (Zn) plays an essential role in many biological processes including immune response. Impaired Zn status promotes immune dysfunction, and it has been associated with enhanced chronic inflammation during aging. It has been suggested that the measurement of circulating Zn by itself could not reflect the real Zn status of an individual. It is therefore necessary to identify other determinants associated with plasma Zn to better understanding how physiopathological conditions during aging may affect the concentration of this metal. METHODS: We have investigated the association between Zn levels and some biomarkers in 1090 healthy elderly from five European countries to increase the accuracy in the assessment of the Zn status. Stepwise multivariate linear regression models were used to analyze the influence of factors such as age, dietary intake, inflammatory mediators, laboratory parameters and polymorphisms previously associated with Zn homeostasis. RESULTS: Plasma Zn decrement was most strongly predicted by age, while positive correlations were found with albumin, RANTES and Zn intake after adjustment for multiple confounders. HSP70 +1267 AA genotype was an independent factor associated with Zn plasma concentrations. Cu/Zn ratio was positively associated with markers of systemic inflammation and age and negatively associated with albumin serum levels. CONCLUSIONS: Our findings show the most important independent determinants of plasma Zn concentration and Cu/Zn ratio variability in elderly population and suggest that the decline with age of Zn circulating levels is more dependent on physiopathological changes occurring with aging rather than to its nutritional intake.


Assuntos
Envelhecimento , Biomarcadores/sangue , Cobre/sangue , Zinco/sangue , Idoso , Idoso de 80 Anos ou mais , Quimiocina CCL5/genética , Quimiocina CCL5/metabolismo , Estudos de Coortes , Cobre/administração & dosagem , Dieta , Dieta Mediterrânea , Europa (Continente) , Feminino , Técnicas de Genotipagem , Homeostase , Humanos , Inflamação/sangue , Inflamação/fisiopatologia , Masculino , Estado Nutricional , Albumina Sérica/metabolismo , Zinco/administração & dosagem
7.
Nutr Metab Cardiovasc Dis ; 26(3): 201-6, 2016 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-26803594

RESUMO

BACKGROUND AND AIMS: Lifestyle habits including dietary intake and physical activity are closely associated with multiple body processes including glucose metabolism and are known to affect human health. Recent genome-wide association studies have identified several single nucleotide polymorphisms (SNPs) associated with glucose levels. The hypothesis tested here is whether a healthy lifestyle assessed via a score is associated with glycaemic traits and whether there is an interaction between the lifestyle and known glucose-raising genetic variants in association with glycaemic traits. METHODS AND RESULTS: Participants of Greek descent from the THISEAS study were included in this analysis. We developed a glucose preventive score (GPS) including dietary and physical activity characteristics. We also modelled a weighted genetic risk score (wGRS), based on 20 known glucose-raising loci, in order to investigate the impact of lifestyle-gene interaction on glucose levels. The GPS was observed to be significantly associated with lower glucose concentrations (ß ± SE: -0.083 ± 0.021 mmol/L, P = 1.6 × 10(-04)) and the wGRS, as expected, with increased glucose levels (ß ± SE: 0.020 ± 0.007 mmol/L, P = 8.4 × 10(-3)). The association of the wGRS with glucose levels was attenuated after interaction with the GPS. A higher GPS indicated decreasing glucose levels in the presence of an increasing wGRS (ß interaction ± SE: -0.019 ± 0.007 mmol/L, P = 0.014). CONCLUSION: Our results indicate that lower glucose levels underlie a healthier lifestyle and also support an interaction between the wGRS for known glycaemic loci and GPS associated with lower glucose levels. These scores could be useful tools for monitoring glucose metabolism.


Assuntos
Glicemia/metabolismo , Dieta Saudável , Exercício Físico , Loci Gênicos , Predisposição Genética para Doença/prevenção & controle , Adulto , Idoso , Índice de Massa Corporal , Estudos Transversais , Feminino , Grécia , Humanos , Insulina/sangue , Modelos Lineares , Masculino , Pessoa de Meia-Idade , Polimorfismo de Nucleotídeo Único , Fatores de Risco
8.
Biogerontology ; 15(1): 65-79, 2014 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-24243066

RESUMO

Proinflammatory cytokines and heat shock proteins play relevant roles in the pathogenesis of inflammatory diseases. We investigated whether Hsp70 1267 A/G and TNF-α -308 G/A polymorphisms are associated with proinflammatory mediators, zinc status and laboratory parameters in 1,078 healthy elderly from ZincAge study. Hsp70 1267 A/G genotype and allele distribution were similar among various European countries, while a TNF-α genetic heterogeneity was observed between the Northern and the Southern European populations, with a major frequency of the -308 A variant in France, Germany and Poland. We used linear regression models to test additive, dominant or recessive associations of each SNP with proinflammatory mediators, laboratory parameters, metallothioneins and zinc status. Hsp70 1267 A/G SNP, but not TNF-α -308 G/A SNP, influences TNF-α and IL-6 plasma levels under additive, dominant and recessive models (for TNF-α only). An association between Hsp70 1267 A/G SNP and zinc plasma levels was observed in the dominant model. In particular, G allele carriers showed increased circulating pro-inflammatory cytokines and zinc. Moreover, both these SNPs affect creatinine levels suggesting a possible influence on renal function. In conclusion, Hsp70 1267 A/G SNP is associated with pro-inflammatory cytokine production in healthy elderly and might represent a possible determinant of individual susceptibility to inflammatory diseases.


Assuntos
Envelhecimento/metabolismo , Citocinas/sangue , Proteínas de Choque Térmico HSP70/genética , Inflamação/sangue , Polimorfismo de Nucleotídeo Único/genética , Fator de Necrose Tumoral alfa/genética , Zinco/metabolismo , Idoso , Idoso de 80 Anos ou mais , Envelhecimento/genética , Proteína C-Reativa/metabolismo , Europa (Continente) , Feminino , Frequência do Gene/genética , Genótipo , Homeostase/fisiologia , Humanos , Inflamação/genética , Masculino , Metalotioneína/metabolismo , Pessoa de Meia-Idade
9.
Nutr Metab Cardiovasc Dis ; 21(7): 476-84, 2011 07.
Artigo em Inglês | MEDLINE | ID: mdl-20227263

RESUMO

BACKGROUND AND AIMS: IL-18 expression is up-regulated in atherosclerotic plaques, and higher levels are seen in obese and Type 2 Diabetic individuals. More recently, a possible role for IL-18 in glucose and energy homeostasis has been suggested. METHODS AND RESULTS: We investigated variation within the IL18 gene and its association with measures of obesity and the metabolic syndrome. Five IL18 tagging single nucleotide polymorphisms (rs1946519, rs2043055, rs549908, rs360729, rs3882891) were selected and genotyped in the Gene-Diet Attica Investigation on childhood obesity (GENDAI) (age range 10-14 yrs); in young European men in the second European Atherosclerosis Research offspring Study (EARSII), an offspring study (age range 18-28 yrs) and in a group of healthy women from the Greek Obese Women study (GrOW) (age range 18-74 yrs). Six common haplotypes were observed. In GrOW, Hap6 (Frequency-2.6%) was associated with higher insulin levels (p<0.0001), estimates of HOMA(-Insulin Resistance) (p<0.0001) and HOMA(-ß-cell) (p<0.0001) compared to the common haplotype Hap1 (Frequency-33.2%). In EARSII, rs2043055 was associated with peak and area under the curve triglycerides (p=0.001 and p=0.002, respectively) after an oral fat tolerance test in 'cases' but not 'controls'. None of the haplotypes were associated with measures of body fatness in any of the studies. CONCLUSION: Association of IL18 variation with insulin levels and estimates of insulin resistance were only observed in our adult study, suggesting that the effects of IL-18 are only associated with increasing age. Taken together with the association of IL18 variants with post-prandial measures, this provides support for IL-18 as a metabolic factor.


Assuntos
Resistência à Insulina/genética , Insulina/sangue , Interleucina-18/genética , Síndrome Metabólica/genética , Obesidade/genética , Polimorfismo de Nucleotídeo Único , Adolescente , Adulto , Idoso , Criança , Europa (Continente) , Feminino , Frequência do Gene , Estudos de Associação Genética , Predisposição Genética para Doença , Grécia , Humanos , Masculino , Síndrome Metabólica/sangue , Pessoa de Meia-Idade , Obesidade/sangue , Período Pós-Prandial , Triglicerídeos/sangue , Adulto Jovem
10.
Eur J Clin Nutr ; 64(3): 253-8, 2010 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-19953105

RESUMO

BACKGROUND/OBJECTIVES: Height is a classic polygenic trait, with a number of genes underlying its variation. We evaluated the prospect of gene-to-diet interactions in a children's cohort, for the insulin-like growth factor II (IGF) rs680 polymorphism and height variation. SUBJECTS/METHODS: We screened 795 periadolescent children (424 girls) aged 10-11 years old from the Gene and Diet Attica Investigation (GENDAI) pediatric cohort for the IGF rs680 polymorphism (rs680). RESULTS: Children homozygous for the common allele (GG) were taller (148.9+/-7.9 cm) compared with those with the A allele (148.1+/-7.9 cm), after adjusting for age, sex and dairy intake (beta+/-s.e.: 2.1+/-0.95, P=0.026). A trend for rs680 x dairy intake interaction was also revealed (P=0.09). Stratification by IGF rs680 genotype revealed positive significant (P=0.014) association between dairy product intake and height in A-allele children adjusted for the same confounders. A daily increase of four dairy servings was associated with a 0.4 cm increase in height. On grouping dairy intake into low (1.9+/-0.7 servings per day) and high dairy product consumption (4.4+/-1.5 servings per day), children with the A allele who were high dairy product consumers were taller compared with the low dairy product consumers (148.8+/-7.9 vs 147.4+/-7.7 cm, respectively, P=0.05). CONCLUSIONS: A higher consumption of dairy products is associated with increased height depending on the rs680 IGF2 genotype.


Assuntos
Estatura/genética , Laticínios , Dieta , Fator de Crescimento Insulin-Like II/genética , Polimorfismo Genético , Fatores Etários , Alelos , Estatura/fisiologia , Criança , Estudos de Coortes , Feminino , Humanos , Masculino , Nutrigenômica , Fatores Sexuais
11.
Ann Clin Biochem ; 47(Pt 1): 44-55, 2010 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-19837725

RESUMO

AIMS: Current screening methods, such as single strand conformational polymorphism (SSCP) and denaturing high performance liquid chromatography (dHPLC) that are used for detecting mutations in familial hypercholesterolaemia (FH) subjects are time consuming, costly and only 80-90% sensitive. Here we have tested high-resolution melt (HRM) analysis for mutation detection using the Rotor-Gene(6000) realtime rotary analyser. Methods and subjects Polymerase chain reaction and melt conditions (HRM) for 23 fragments of the LDL-receptor gene, a region of exon 26 in the APOB gene (including p.R3527Q) and exon 7 of the PCSK9 gene (including p.D374Y) were optimized. Two double stranded DNA saturating dyes, LC-Green and Syto9, were compared for sensitivity. Eighty-two samples with known mutations were used as positive controls. Twenty-eight Greek FH heterozygous patients and two homozygous patients from the UK and Croatia were screened. RESULTS: HRM was able to identify all the positive control mutations tested, with similar results with either dye. Eight different variations were found in 17 of the 28 Greek FH patients for an overall detection rate of 61%: c.41delT (1), p.W165X (1), p.C173R (3), p.S286R (2), p.V429M (4), p.G549D (4), p.V613I (1), and a previously unreported mutation p.F694V (1) which is predicted to be FH-causing by functional algorithms. Mutations were found in both the homozygous patients; p.Q92X (Croatia) and p.Y489C (UK); both patients were homozygous for their respective mutations. CONCLUSIONS: HRM is a sensitive, robust technique that could significantly reduce the time and cost of screening for mutations in a clinical setting.


Assuntos
Análise Mutacional de DNA/métodos , Hiperlipoproteinemia Tipo II/genética , Desnaturação de Ácido Nucleico , Adolescente , Adulto , Idoso , Pré-Escolar , Feminino , Testes Genéticos/métodos , Heterozigoto , Homozigoto , Humanos , Hiperlipoproteinemia Tipo II/diagnóstico , Lactente , Masculino , Pessoa de Meia-Idade , Mutação , Reação em Cadeia da Polimerase/métodos , Polimorfismo de Nucleotídeo Único , Sensibilidade e Especificidade
12.
Nutr Metab Cardiovasc Dis ; 20(1): 26-33, 2010 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-19403283

RESUMO

BACKGROUND AND AIMS: Studies have consistently demonstrated that variants in a number of candidate genes are significant determinants of lipid levels in adults. However, few studies have investigated the impact of these variants in children. Therefore, in the present investigation we examined the influence of ten common variants in the genes for lipoprotein lipase (LPL-S447X), cholesterol ester transfer protein (CETP-Taq1B) apolipoprotein (APO) E (epsilon2, epsilon3, epsilon4), APOA5 (-1131C>T and S19W), APOA4 (S347T) and APOC3 (-482C>T; 1100C>T and 3238G>C) on lipoprotein levels children from the Gene-Diet Attica Investigation on childhood obesity (GENDAI). METHODS AND RESULTS: The ten variants selected were genotyped in 882 Greek children, mean age: 11.2+/-0.7 years (418 females and 464 males). Genotypes were assessed using TaqMan technology. Significantly higher total cholesterol (TC) (p=0.0001) and low-density lipoprotein cholesterol (LDL-C) (p<0.0001) were observed in APOE epsilon4 carriers compared to epsilon3/epsilon3 homozygotes and epsilon2 carriers. The association of APOE genotype with TC and high-density lipoprotein cholesterol (HDL-C) ratio (p=0.0008) was further modulated by body mass index. Carriers of the CETP TaqIB B2 allele had significantly higher HDL-C (p<0.0001) and significantly lower TC: HDL-C ratio (p<0.0001) compared to B1/B1 individuals. No significant associations were observed between APOA4, APOA5 and APOC3 variants and serum lipids. CONCLUSION: This study demonstrates that these common variants are associated with lipid levels in this healthy paediatric cohort, suggesting that even in these young children there may be potential in predicting their lifelong exposure to an adverse lipid profile.


Assuntos
Apolipoproteínas E/genética , Proteínas de Transferência de Ésteres de Colesterol/genética , HDL-Colesterol/sangue , LDL-Colesterol/sangue , Colesterol/sangue , Hipercolesterolemia/genética , Lipase Lipoproteica/genética , Apolipoproteína C-III/genética , Apolipoproteínas A/genética , Índice de Massa Corporal , Criança , Colesterol/genética , HDL-Colesterol/genética , LDL-Colesterol/genética , Estudos de Coortes , Feminino , Estudos de Associação Genética , Grécia , Heterozigoto , Homozigoto , Humanos , Hipercolesterolemia/sangue , Masculino , Polimorfismo de Nucleotídeo Único , Estatística como Assunto
13.
Artigo em Inglês | MEDLINE | ID: mdl-18622089

RESUMO

UNLABELLED: INTRODUCTION--HYPOTHESIS: Since the genetic bases of bone mass regulation in males are still poorly understood and the role of calciotropic hormones on bone mineral metabolism is absolute, our hypothesis is based on the certainty that specific genetic polymorphism will contribute, at least, on bone mass values. Our objective was to examine the relative contribution of genetic variables to the regulation of bone values in a population of young healthy men, focusing on the BsmI polymorphism of vitamin D receptor (VDR) gene and the AluI polymorphism of calcitonin receptor (CTR) gene. METHODS: Areal bone mineral density (aBMD), bone mineral content (BMC) and geometrical areas at specific skeletal sites of the forearm, of 301 healthy Caucasian young men, aged 18-25, were assessed by single X-ray absorptiometry (Osteometer DTX-100). VDR and CTR alleles were determined by BsmI and AluI endonuclease restriction fragment analyses. Analysis of covariance was used as a statistical model. RESULTS: No significant differences in the forearm aBMD, BMC or in area values were observed between the VDR and CTR genotypes. Findings did not change after adjusting for demographic characteristics. CONCLUSIONS: The BsmI and AluI polymorphisms are not related to the forearm bone values either reflecting mass or geometrical variables in this male population.


Assuntos
Densidade Óssea/genética , Antebraço , Polimorfismo Genético , Receptores da Calcitonina/genética , Receptores de Calcitriol/genética , Absorciometria de Fóton , Adolescente , Adulto , Estudos de Coortes , Genótipo , Grécia , Humanos , Masculino , Adulto Jovem
14.
Eur J Clin Invest ; 38(3): 180-90, 2008 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-18257781

RESUMO

BACKGROUND: Autosomal dominant polycystic kidney disease (ADPKD), which is caused by mutations in polycystins 1 (PC1) and 2 (PC2), is one of the most commonly inherited renal diseases, affecting ~1 : 1000 Caucasians. MATERIALS AND METHODS: We screened Greek ADPKD patients with the denaturing gradient gel electrophoresis (DGGE) assay and direct sequencing. RESULTS: We identified a patient homozygous for a nucleotide change c.1445T > G, resulting in a novel homozygous substitution of the non-polar hydrophobic phenylalanine to the polar hydrophilic cysteine in exon 6 at codon 482 (p.F482C) of the PKD2 gene and a de-novo PKD1 splice-site variant IVS21-2delAG. We did not find this PKD2 variant in a screen of 280 chromosomes of healthy subjects, supporting its pathogenicity. The proband's parents did not have the PKD1 mutation. Real-time PCR of the PKD2 transcript from a skin biopsy revealed 20-fold higher expression in the patient than in a healthy subject and was higher in the patient's peripheral blood mononuclear cells (PBMCs) than in those of her heterozygote daughter and a healthy subject. The greater gene expression was also supported by Western blotting. Inner medullar collecting duct (IMCD) cells transfected with the mutant PKD2 mouse gene presented a perinuclear and diffuse cytoplasmic localization compared with the wild type ER localization. Patch-clamping of PBMCs from the p.F482C homozygous and heterozygous subjects revealed lower polycystin-2 channel function than in controls. CONCLUSIONS: We report for the first time a patient with ADPKD who is heterozygous for a de novo PKD1 variant and homozygous for a novel PKD2 mutation.


Assuntos
Rim Policístico Autossômico Dominante/genética , Proteínas/genética , Animais , Células Cultivadas , Análise Mutacional de DNA , Eletroforese/métodos , Feminino , Homozigoto , Humanos , Masculino , Camundongos , Mutação , Reação em Cadeia da Polimerase , Canais de Cátion TRPP
15.
Exp Gerontol ; 43(5): 445-51, 2008 May.
Artigo em Inglês | MEDLINE | ID: mdl-18078731

RESUMO

A large body of experimental research indicates that oxidative stress contributes to the processes related to aging and age-related diseases. Trace elements, particularly zinc (Zn), are essential components of the endogenous enzymatic antioxidant defenses. The aim of this study was to determine the activity of three main antioxidant enzymes in plasma [i.e. superoxide dismutase (pSOD), catalase (CAT), glutathione peroxidase (GPx)] and of SOD in erythrocyte (eSOD) in a group of 1108 healthy elderly subjects from different European countries. The same enzymatic activities were evaluated in a subgroup of 108 subjects before and after Zn supplementation. We observed that eSOD activity increased with age, whereas plasma Zn decreased. Moreover, we found that women showed higher eSOD activity and lower plasma Zn compared to men. There were no age and gender-related differences in the activities of pSOD, CAT and GPx. After Zn supplementation, the activities of Zn-dependent enzymes (pSOD and eSOD), as well as plasma Zn concentration, were significantly higher than before supplementation. These results were not influenced by age, gender, plasma Zn variations (Delta Zn) and geographic area. These data suggest the potential beneficial effects of Zn supplementation on Zn-dependent antioxidant enzymes in healthy elderly subjects.


Assuntos
Envelhecimento/metabolismo , Oxirredutases/efeitos dos fármacos , Oligoelementos/farmacologia , Zinco/farmacologia , Idoso , Idoso de 80 Anos ou mais , Catalase/efeitos dos fármacos , Catalase/metabolismo , Suplementos Nutricionais , Eritrócitos/enzimologia , Feminino , Glutationa Peroxidase/efeitos dos fármacos , Glutationa Peroxidase/metabolismo , Humanos , Masculino , Pessoa de Meia-Idade , Estresse Oxidativo/efeitos dos fármacos , Oxirredutases/metabolismo , Caracteres Sexuais , Superóxido Dismutase/efeitos dos fármacos , Superóxido Dismutase/metabolismo , Oligoelementos/administração & dosagem , Zinco/administração & dosagem , Zinco/deficiência
17.
Atherosclerosis ; 187(1): 1-17, 2006 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-16313912

RESUMO

Several naturally occurring constituents have received considerable attention because of their potential antioxidant activity. Consuming a diet rich in natural antioxidants has been associated with prevention from and/or treatment of atherosclerosis. Bioactive components of food, which are of special interest, include the Vitamins E and C, polyphenols, carotenoids-mainly lycopene and beta-carotene, and coenzyme Q10, featured by antioxidant properties. Antioxidant therapy is supposed to be effective in the early stages of atherosclerosis by preventing LDL oxidation and the oxidative lesion of endothelium. This review focuses on the effect of dietary antioxidants pertained to LDL oxidation and to the vascular endothelial dysfunction. Now that the human genome has been completely sequenced, genetic factors involved in oxidation may open new horizons to identify persons at risk for cardiovascular disease, allowing effective dietary intervention strategies to recover normal homeostasis and to prevent diet-related implications. On this basis, current studies on the action of selected antioxidant nutraceuticals on the activity of transcription factors, such as final targets in the signal transduction cascade and gene regulation, may emerge into new treatment concepts.


Assuntos
Antioxidantes/farmacologia , Aterosclerose/prevenção & controle , Dieta , Regulação da Expressão Gênica , Animais , Antioxidantes/metabolismo , Aterosclerose/tratamento farmacológico , Modelos Animais de Doenças , Endotélio Vascular/metabolismo , Humanos , Lipoproteínas LDL/metabolismo , Modelos Biológicos , Estresse Oxidativo , Oxigênio/metabolismo , Transcrição Gênica , Vitaminas/metabolismo
18.
Clin Exp Med ; 5(4): 196-201, 2005 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-16362800

RESUMO

Familial hypercholesterolaemia is a genetic disorder characterised by high low-density lipoprotein (LDL) cholesterol concentrations, which frequently gives rise to premature coronary artery disease (CAD). The clinical expression of familial hypercholesterolaemia is highly variable even in patients carrying the same LDL receptor gene mutation. This variability may be due to environmental and other genetic factors. Apolipoprotein E (Apo-E) has been extensively studied for its effects on the phenotype of familial hypercholesterolaemia. In this study we examined the influence of Apo-E genotype on lipid parameters and the incidence of CAD in 93 Greek patients with familial hypercholesterolaemia. Apo-E E2, E3 and E4 allele frequencies were 0.06, 0.86 and 0.09 respectively. The levels of total cholesterol, LDL cholesterol, HDL cholesterol, triglycerides, apolipoproteins A and B and lipoprotein alpha did not differ significantly among carriers and non-carriers of the E4 allele. The prevalence of CAD and hypertension did not differ either. Our results suggest that the E4 allele is not associated with lipid levels or with the prevalence of CAD among familial hypercholesterolaemia patients of the Greek population.


Assuntos
Apolipoproteínas E/genética , Doença da Artéria Coronariana/genética , Hiperlipoproteinemia Tipo II/genética , Lipídeos/sangue , Polimorfismo Genético , Adulto , Feminino , Humanos , Hiperlipoproteinemia Tipo II/sangue , Masculino
19.
Ann Hum Genet ; 69(Pt 3): 268-74, 2005 May.
Artigo em Inglês | MEDLINE | ID: mdl-15845031

RESUMO

Wilson disease (WD) is an autosomal recessive disorder of copper metabolism. The disorder is caused by mutations in the ATP7B gene, encoding a copper transporting P-type ATPase. The worldwide incidence is in the order of 30 cases per million, with a gene frequency of 0.56% and a carrier frequency of 1 in 90. The increased number of Wilson disease patients in the island of Crete led us to study the spectrum of mutations in a small village close to the city of Heraklion, from where many patients have been referred during the last 25 years. In order to estimate the frequency of the disease, we firstly investigated the number of births and the number of WD patients in the village since 1978. Six out of 90 births were diagnosed as WD patients, presenting the highest prevalence of WD reported so far. Analysis of the whole gene in three Wilson disease patients, and relatives of a boy who died from WD, led to the detection of 4 different point mutations. Two of them were missense (p.I1148T and p.G1176R) and cosegregated in cis in the same patient; the other allele of this patient carried a nonsense mutation (p.Q289X). This is the first report in the literature of three mutations co-segregating in the same WD patient. The fourth mutation identified was a novel frameshift mutation (c.398delT) with documented cosegregation. When screening 200 inhabitants originating from the same area, 18 were found to be carriers of one of these mutations. These findings indicate the need for health education intervention, genetic counselling and newborn screening for the Wilson disease.


Assuntos
Adenosina Trifosfatases/genética , Proteínas de Transporte de Cátions/genética , Degeneração Hepatolenticular/epidemiologia , Degeneração Hepatolenticular/genética , Idade de Início , Criança , Pré-Escolar , ATPases Transportadoras de Cobre , Análise Mutacional de DNA , Feminino , Mutação da Fase de Leitura , Grécia/epidemiologia , Humanos , Masculino , Mutação de Sentido Incorreto , Linhagem , Reação em Cadeia da Polimerase , Polimorfismo de Fragmento de Restrição , Prevalência
20.
Pharmacogenomics J ; 5(4): 221-5, 2005.
Artigo em Inglês | MEDLINE | ID: mdl-15852053

RESUMO

Pharmacogenomics would be instrumental for the realization of personalized medicine in coming decades. Efforts are evident to clarify the potential bioethical, societal, and legal implications of key pharmacogenomics-based technologies projected to be soon introduced into the core practice of medicine. In sharp contrast, a lack of sufficient attention to educational aspects of pharmacogenomics, both for professionals and for society at large, is evident. In order to contribute to this discussion, a 'Pharmacogenomics Education Forum' was held on October 2, 2004 during the 3rd Annual Meeting of the International Society of Pharmacogenomics (ISP) at Santorini, Greece. The participants, members of the ISP Pharmacogenomics Education Forum, after deliberate discussions, proposed a document of 'Background Statement' and 'Recommendations and Call for Action' addressed to Deans of Education at Medical, Pharmaceutical, and Health Schools globally. This document has been considered by the education committee of the International Society of Pharmacogenomics and the result is presented here. We hope that this call would be listened to, and soon followed by beneficial action, ultimately leading to enhanced implementation of personalized medicine into core medical education and practice.


Assuntos
Currículo/normas , Guias como Assunto , Cooperação Internacional , Farmacogenética/educação , Escolas para Profissionais de Saúde/normas , Sociedades Médicas
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