Metabolismo da homocisteína e perfil lipídico de adolescentes com fatores de risco cardiovascular: relações com polimorfismos no gene da metilenotetra-hidrofolato redutase
Autor(a) principal: | |
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Data de Publicação: | 2015 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFG |
Texto Completo: | http://repositorio.bc.ufg.br/tede/handle/tede/4778 |
Resumo: | Objective: to investigate the prevalence of alterations in homocysteinemia, lipid profile and vitamins B6, B12 and folic acid concentrations, as well as the possible relationships among C677T and A1298C polymorphisms in methylenetetrahydrofolate reductase (MTHFR) gene and blood concentrations of these biomarkers in adolescents with cardiovascular risk factors. Material and Methods: cross-sectional study with adolescents (10-19 years old) from a public school in Goiânia, Goiás. Screening was performed with 454 students in this age group. Those who were overweight, or presented risk factors associated with family history, or had been previously diagnosed with dyslipidemia were recruited, totaling a final sample of 115 individuals. Blood concentrations of homocysteine, vitamin B6 and vitamin B12, folic acid, oxidized low density lipoprotein (ox-LDL) and lipids were analyzed. The sample was stratified according to tertiles of plasma homocysteine concentrations. Genotyping of the above mentioned polymorphisms was performed. Analysis of differences between means was performed using Student’s t test, Mann Whitney, ANOVA or Kruskal-Wallis’s test. Correlations among variables were evaluated with the Pearson’s correlation or Spearman’s test. Results: hyperhomocysteinemia was observed in 19.1% of the sample and alterations in prevalence of alterations in the lipid profile were 30.4%, with 48.0% to high-density lipoprotein, and vitamin B6 deficiency was 23, 5%. Individuals in the highest tertile for homocysteine showed blood concentrations of folic acid and HDL-c higher compared to those of the middle and lower tertile, and waist circumference greater than in those of the lower tertile. There were no significant differences in anthropometric and biochemical variables when analyzed according to the three possible genotypes realtives to the C677T and A1298C polymorphisms. However, when heterozygous and homozygous for the variant alleles for C677T polymorphism were grouped, carriers of the variant ones showed higher plasma concentrations of oxidized low density lipoprotein (p < 0.01) and vitamin B6 plasma levels (p < 0.02). Conclusion: Despite the high prevalence of hyperhomocysteinemia, it was not observed it was not observed relationship of C677T and A1298C polymorphisms with plasma concentrations of homocysteine. However, the results of the study revealed the influence of MTHFR C677T genotype on vitamin B6 and oxidized low density lipoprotein levels. |
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Cominetti, Cristianehttp://lattes.cnpq.br/3143023553465749Horst, Maria Aderuzahttp://lattes.cnpq.br/4145824009736834Cominetti, CristianeIzacc, Sílvia Maria SalemBotelho, Patrícia Borgeshttp://lattes.cnpq.br/6191950686992379Morais, Carla Cristina de2015-10-26T14:43:30Z2015-03-27MORAIS, C. C. Metabolismo da homocisteína e perfil lipídico de adolescentes com fatores de risco cardiovascular: relações com polimorfismos no gene da metilenotetra-hidrofolato redutase. 2015. 124 f. Dissertação (Mestrado em Nutrição e Saúde) - Universidade Federal de Goiás, Goiânia, 2015.http://repositorio.bc.ufg.br/tede/handle/tede/4778Objective: to investigate the prevalence of alterations in homocysteinemia, lipid profile and vitamins B6, B12 and folic acid concentrations, as well as the possible relationships among C677T and A1298C polymorphisms in methylenetetrahydrofolate reductase (MTHFR) gene and blood concentrations of these biomarkers in adolescents with cardiovascular risk factors. Material and Methods: cross-sectional study with adolescents (10-19 years old) from a public school in Goiânia, Goiás. Screening was performed with 454 students in this age group. Those who were overweight, or presented risk factors associated with family history, or had been previously diagnosed with dyslipidemia were recruited, totaling a final sample of 115 individuals. Blood concentrations of homocysteine, vitamin B6 and vitamin B12, folic acid, oxidized low density lipoprotein (ox-LDL) and lipids were analyzed. The sample was stratified according to tertiles of plasma homocysteine concentrations. Genotyping of the above mentioned polymorphisms was performed. Analysis of differences between means was performed using Student’s t test, Mann Whitney, ANOVA or Kruskal-Wallis’s test. Correlations among variables were evaluated with the Pearson’s correlation or Spearman’s test. Results: hyperhomocysteinemia was observed in 19.1% of the sample and alterations in prevalence of alterations in the lipid profile were 30.4%, with 48.0% to high-density lipoprotein, and vitamin B6 deficiency was 23, 5%. Individuals in the highest tertile for homocysteine showed blood concentrations of folic acid and HDL-c higher compared to those of the middle and lower tertile, and waist circumference greater than in those of the lower tertile. There were no significant differences in anthropometric and biochemical variables when analyzed according to the three possible genotypes realtives to the C677T and A1298C polymorphisms. However, when heterozygous and homozygous for the variant alleles for C677T polymorphism were grouped, carriers of the variant ones showed higher plasma concentrations of oxidized low density lipoprotein (p < 0.01) and vitamin B6 plasma levels (p < 0.02). Conclusion: Despite the high prevalence of hyperhomocysteinemia, it was not observed it was not observed relationship of C677T and A1298C polymorphisms with plasma concentrations of homocysteine. However, the results of the study revealed the influence of MTHFR C677T genotype on vitamin B6 and oxidized low density lipoprotein levels.Objetivo: investigar a prevalência de alterações na homocisteinemia, no perfil lipídico e nas concentrações de vitaminas B6, B12 e ácido fólico, bem como as possíveis relações entre os polimorfismos C677T e A1298C no gene que codifica a metilenotetra-hidrofolato redutase (MTHFR) e as concentrações sanguíneas destes biomarcadores em adolescentes com fatores de risco cardiovascular. Material e métodos: estudo observacional, transversal, com adolescentes (10-19 anos de idade) de uma escola pública de Goiânia, Goiás. Realizou-se triagem inicial com 454 alunos e aqueles com excesso de peso e/ou dislipidemia previamente diagnosticada foram recrutados, com amostra final de 115 indivíduos. As concentrações plasmáticas de homocisteína e vitamina B6 e séricas de vitamina B12, ácido fólico, lipoproteína de baixa densidade oxidada (LDL-ox) e perfil lipídico foram analisadas. Realizou-se a genotipagem em relação aos polimorfismos MTHFR C677T e A1298C. Análises de diferenças de médias foram feitas com o teste t de Student, Mann Whitney, ANOVA ou Kruskal-Wallis. Correlações entre as variáveis foram avaliadas por meio do teste de correlação de Pearson ou Spearman. Resultados: Foi observada hiper-homocisteinemia em 19,1% da amostra, prevalência de alterações no perfil lipídico de 30,4%, com destaque para 48,0% em relação à lipoproteína de alta densidade, e deficiência de vitamina B6 e 23,5%. Os indivíduos do tercil superior em relação a homocisteína apresentaram concentrações sanguíneas de ácido fólico e HDL-c maiores em relação àqueles do tercil médio e inferior, e circunferência da cintura maior em relação àqueles do tercil inferior. A circunferência da cintura Não houve diferenças significativas para antropometria e exames bioquímicos quando analisados em função dos três possíveis genótipos referentes aos polimorfismos C677T e A1298C. Entretanto, ao agrupar os genótipos heterozigotos e homozigotos para a variante do polimorfismo C677T, carreadores do alelo variante apresentaram maiores concentrações séricas de lipoproteína de baixa densidade oxidada (p<0,01) e de concentrações plasmáticas de vitamina B6 (p<0,02). Conclusão: Apesar da alta prevalência de hiper-homocisteinemia, não houve relação dos polimorfismos C677T e A1298C com as concentrações plasmáticas de homocisteína. Entretanto, os resultados do estudo revelaram a influência do genótipo em relação ao polimorfismo C677T no gene da MTHFR sobre as concentrações de vitamina B6 e de lipoproteína de baixa densidade oxidada.Submitted by Cássia Santos (cassia.bcufg@gmail.com) on 2015-10-26T14:13:48Z No. of bitstreams: 2 Dissertação - Carla Cristina de Morais - 2015.pdf: 3178195 bytes, checksum: 8ef80dde024e6522fcf444b8134bf176 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5)Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2015-10-26T14:43:30Z (GMT) No. of bitstreams: 2 Dissertação - Carla Cristina de Morais - 2015.pdf: 3178195 bytes, checksum: 8ef80dde024e6522fcf444b8134bf176 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5)Made available in DSpace on 2015-10-26T14:43:30Z (GMT). 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dc.title.por.fl_str_mv |
Metabolismo da homocisteína e perfil lipídico de adolescentes com fatores de risco cardiovascular: relações com polimorfismos no gene da metilenotetra-hidrofolato redutase |
dc.title.alternative.eng.fl_str_mv |
Homocysteine metabolism and lipid profile of adolescents with cardiovascular risk factors: relations with methlenetetrahydrofolate reductase gene polymorphisms |
title |
Metabolismo da homocisteína e perfil lipídico de adolescentes com fatores de risco cardiovascular: relações com polimorfismos no gene da metilenotetra-hidrofolato redutase |
spellingShingle |
Metabolismo da homocisteína e perfil lipídico de adolescentes com fatores de risco cardiovascular: relações com polimorfismos no gene da metilenotetra-hidrofolato redutase Morais, Carla Cristina de Adolescentes Doenças cardiovasculares Fatores de risco Adolescents Cardiovascular disease Hyperhomocysteinemia Risk factors CIENCIAS DA SAUDE::NUTRICAO |
title_short |
Metabolismo da homocisteína e perfil lipídico de adolescentes com fatores de risco cardiovascular: relações com polimorfismos no gene da metilenotetra-hidrofolato redutase |
title_full |
Metabolismo da homocisteína e perfil lipídico de adolescentes com fatores de risco cardiovascular: relações com polimorfismos no gene da metilenotetra-hidrofolato redutase |
title_fullStr |
Metabolismo da homocisteína e perfil lipídico de adolescentes com fatores de risco cardiovascular: relações com polimorfismos no gene da metilenotetra-hidrofolato redutase |
title_full_unstemmed |
Metabolismo da homocisteína e perfil lipídico de adolescentes com fatores de risco cardiovascular: relações com polimorfismos no gene da metilenotetra-hidrofolato redutase |
title_sort |
Metabolismo da homocisteína e perfil lipídico de adolescentes com fatores de risco cardiovascular: relações com polimorfismos no gene da metilenotetra-hidrofolato redutase |
author |
Morais, Carla Cristina de |
author_facet |
Morais, Carla Cristina de |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Cominetti, Cristiane |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/3143023553465749 |
dc.contributor.advisor-co1.fl_str_mv |
Horst, Maria Aderuza |
dc.contributor.advisor-co1Lattes.fl_str_mv |
http://lattes.cnpq.br/4145824009736834 |
dc.contributor.referee1.fl_str_mv |
Cominetti, Cristiane |
dc.contributor.referee2.fl_str_mv |
Izacc, Sílvia Maria Salem |
dc.contributor.referee3.fl_str_mv |
Botelho, Patrícia Borges |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/6191950686992379 |
dc.contributor.author.fl_str_mv |
Morais, Carla Cristina de |
contributor_str_mv |
Cominetti, Cristiane Horst, Maria Aderuza Cominetti, Cristiane Izacc, Sílvia Maria Salem Botelho, Patrícia Borges |
dc.subject.por.fl_str_mv |
Adolescentes Doenças cardiovasculares Fatores de risco |
topic |
Adolescentes Doenças cardiovasculares Fatores de risco Adolescents Cardiovascular disease Hyperhomocysteinemia Risk factors CIENCIAS DA SAUDE::NUTRICAO |
dc.subject.eng.fl_str_mv |
Adolescents Cardiovascular disease Hyperhomocysteinemia Risk factors |
dc.subject.cnpq.fl_str_mv |
CIENCIAS DA SAUDE::NUTRICAO |
description |
Objective: to investigate the prevalence of alterations in homocysteinemia, lipid profile and vitamins B6, B12 and folic acid concentrations, as well as the possible relationships among C677T and A1298C polymorphisms in methylenetetrahydrofolate reductase (MTHFR) gene and blood concentrations of these biomarkers in adolescents with cardiovascular risk factors. Material and Methods: cross-sectional study with adolescents (10-19 years old) from a public school in Goiânia, Goiás. Screening was performed with 454 students in this age group. Those who were overweight, or presented risk factors associated with family history, or had been previously diagnosed with dyslipidemia were recruited, totaling a final sample of 115 individuals. Blood concentrations of homocysteine, vitamin B6 and vitamin B12, folic acid, oxidized low density lipoprotein (ox-LDL) and lipids were analyzed. The sample was stratified according to tertiles of plasma homocysteine concentrations. Genotyping of the above mentioned polymorphisms was performed. Analysis of differences between means was performed using Student’s t test, Mann Whitney, ANOVA or Kruskal-Wallis’s test. Correlations among variables were evaluated with the Pearson’s correlation or Spearman’s test. Results: hyperhomocysteinemia was observed in 19.1% of the sample and alterations in prevalence of alterations in the lipid profile were 30.4%, with 48.0% to high-density lipoprotein, and vitamin B6 deficiency was 23, 5%. Individuals in the highest tertile for homocysteine showed blood concentrations of folic acid and HDL-c higher compared to those of the middle and lower tertile, and waist circumference greater than in those of the lower tertile. There were no significant differences in anthropometric and biochemical variables when analyzed according to the three possible genotypes realtives to the C677T and A1298C polymorphisms. However, when heterozygous and homozygous for the variant alleles for C677T polymorphism were grouped, carriers of the variant ones showed higher plasma concentrations of oxidized low density lipoprotein (p < 0.01) and vitamin B6 plasma levels (p < 0.02). Conclusion: Despite the high prevalence of hyperhomocysteinemia, it was not observed it was not observed relationship of C677T and A1298C polymorphisms with plasma concentrations of homocysteine. However, the results of the study revealed the influence of MTHFR C677T genotype on vitamin B6 and oxidized low density lipoprotein levels. |
publishDate |
2015 |
dc.date.accessioned.fl_str_mv |
2015-10-26T14:43:30Z |
dc.date.issued.fl_str_mv |
2015-03-27 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
MORAIS, C. C. Metabolismo da homocisteína e perfil lipídico de adolescentes com fatores de risco cardiovascular: relações com polimorfismos no gene da metilenotetra-hidrofolato redutase. 2015. 124 f. Dissertação (Mestrado em Nutrição e Saúde) - Universidade Federal de Goiás, Goiânia, 2015. |
dc.identifier.uri.fl_str_mv |
http://repositorio.bc.ufg.br/tede/handle/tede/4778 |
identifier_str_mv |
MORAIS, C. C. Metabolismo da homocisteína e perfil lipídico de adolescentes com fatores de risco cardiovascular: relações com polimorfismos no gene da metilenotetra-hidrofolato redutase. 2015. 124 f. Dissertação (Mestrado em Nutrição e Saúde) - Universidade Federal de Goiás, Goiânia, 2015. |
url |
http://repositorio.bc.ufg.br/tede/handle/tede/4778 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.program.fl_str_mv |
-3010970718164250106 |
dc.relation.confidence.fl_str_mv |
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