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1.
Rev. costarric. cardiol ; 14(1/2): 15-20, ene.-dic. 2012. tab
Article in Spanish | LILACS | ID: lil-657751

ABSTRACT

Los niveles aumentados de los factores de la coagulación como el FVII y FXIII se han asociado con infarto agudo del miocardio (IAM). Los estudios de biología molecular han permitido detectar varias mutaciones en los genes del FVII y FXIII que se han asociado al riesgo de enfermedad coronaria. Métodos: Se estudiaron 186 pacientes que sufrieron infarto agudo del miocardio y 201 controles sanos. Se determinaron los polimorfismos FXIII (Val34Leu);FVII, IV(S7), FVII (R353Q), según las técnicas descritas. Cabe destacar que esta investigación siguió los lineamientos de bioética. Resultados: La edad de los pacientes fue de 46,2 años (147 hombres/39 mujeres), y la de los controles fue de 46 años (141 hombres/60 mujeres). La prevalencia de las mutaciones obtenidas tanto en pacientes como controles fue: FVII IVS7 OR: 0,60 (0,26-1,38) p=0,193 y FVIIR353Q OR:0,81 (0,61-1,08) p=0,729; respectivamente. El fenotipo Leu/Leu tiene más elevada prevalencia en los casos controles que en los pacientes infartados, al hacer el ajuste de factores de riesgo cardiovascular, se demostró que este fenotipo es un factor protector para el desarrollo del IAM OR: 0,66 (0,47-0,93) p=0,01. Los factores de riesgo tradicionales fueron estadísticamente significativos. En el FVII, y en el FVII, y en el FVII IVS se encontraron nuevas variantes (4 y 8), no descritas previamente. Conclusión: El FXIII Val34Leu se presenta como factor protector contra el IAM, y ninguno de los polimorfismos del FVII se encontró asociado como factor de riesgo para IAM. El FXIII Val34Leu ha sido descrito como un facilitador de la activación del factor XIII, durante la fase final de la coagulación, incrementando y acelerando la estabilización de la fibrina, confiriendo más resistencia ante la fibrinólisis. Se incrementan el interés de este polimorfismo en el IAM y en especial para los pacientes que fueran sometidos a terapia antibrinolítica.


Increased levels of coagulation factors such as FVII and FXIII have been associated with acute myocardial Infarction (AMI).Molecular biology studies have identified several mutations in the genes of FVII and FXIII and observe its influence on thelevels of these and their possible association and risk of AMI.Methods: We studied 186 patients with documented AMI and 201 controls with no history of cardiovascular disease. Weperformed a case-control study. It was determined the FXIII Val34Leu polymorphisms, FVII IVS7, FVII R353Q, according tothe procedures described. This research followed the guidelines of institutional bioethics.Results: The mean age of patients was 46.2 years (147 men / 39 women), and controls was 46 years (141 men / 60 women).The prevalence of mutations obtained in patients as controls were: FVII IVS7 OR: 0.60 (0.26 to 1.38) p = 0.193 and FVIIR353QOR: 0.81 (0.61 to 1.08) p = 0.729 , respectively. It is observed that the phenotype Leu/Leu is more common in controls thanin patients, and after adjustment for cardiovascular risk factors, was shown to be a protective factor for the developmentof AMI OR: 0.66 (0.47 - 0.93) p = 0.01. The traditional risk factors were statistically significant. In FVII, were found in the FVIIIVS, new variants * (4 and 8), not previously described.Conclusion: FXIII Val34Leu was found as protector factor but neither FVII polymorphisms were associated as risk factors forAMI. FXIII Val34Leu, had been described as a facilitator of the activation of factor XIII, during the final stages of coagulation,increasing and accelerating stabilization of the fibrin, conferring mayor resistance to fibrinolysis. Increase the interest ofthis polymorphism in AMI and especially for patients who were subjected to antifibrinolytic therapy.


Subject(s)
Humans , Male , Female , Middle Aged , Costa Rica , Myocardial Infarction , Risk Factors
2.
Cell Biochem Funct ; 25(6): 739-45, 2007.
Article in English | MEDLINE | ID: mdl-17195962

ABSTRACT

In this study, eight common polymorphisms associated with venous thrombosis (VT) and thrombophilia factors were analyzed in a Costa Rican case-control study. With the use of polymerase chain reaction (PCR) methods the polymorphisms were detected in 120 patients and 133 controls (mean age <40 years old). It was concluded that a high level of fibrinogen, antiphospholipid antibodies, family history, and the genotype 34LeuLeu of FXIII OR 0.42 (0.20-0.89) showed a significant effect on the risk of VT. Associations between the risk of VT and genetic polymorphisms have been established. Some of these polymorphisms are highly prevalent in Caucasians, but there is a significant geographic variation in their prevalence among different populations. The results of this study support the protective effect of FXIII Val34Leu polymorphism in VT. These findings are consistent with previous reports that included other populations.


Subject(s)
Factor XIII/genetics , Polymorphism, Genetic , Venous Thrombosis/genetics , Adult , Amino Acid Substitution , Antibodies, Antiphospholipid/blood , Case-Control Studies , Costa Rica , Female , Fibrinogen/metabolism , Gene Frequency , Humans , Male , Middle Aged , Odds Ratio , Risk Factors , Venous Thrombosis/blood , Venous Thrombosis/pathology
3.
Rev. biol. trop ; Rev. biol. trop;54(1): 1-11, mar. 2006. tab
Article in English | LILACS | ID: lil-484689

ABSTRACT

Eight common polymorphisms of known myocardial infarction (MI)risk factors (factor V Leiden (FVL), factor V HR2 (FVHR2), factor II 20210G>A (FII), factor VII IVS7 (FVII IVS7), factor VII Arg353Gln (FVII), factor XIII Val34Leu (FXIII), Methylenetetrahydrofolate reductase C677T (MTHFR), Angiotensin Converting Enzyme (ACE))and environmental risk factors were analyzed in a MI patients of Costa Rica.This case-control study included 186 MI subjects,95 of them <45 years and 201 age and sex matched controls.With the use of PCR method the polymorphisms were detected and through interviews additional information was collected.Hypercholesterolemia and smoking were associated with a significant risk in younger patients.High fibrinogen level was an important risk factor and interaction with smoking was detected.Mainly,the genotype 34LeuLeu of FXIII showed significant protective effect,(OR 0.32,95%CI 0.13-0.80)while the other polymor- phisms showed no significant difference between the cases and the controls.Carriers of FVII (OR 2.75,95%CI 1.07-7.02)and FXIII (OR 4.20,95%CI 2.03-8.67)polymorphisms showed interaction with fibrinogen in the sta- tistical analysis.It was concluded that there was an important interaction between the common risk factors and the polymorphisms (FVII;FXIII)in the development of MI.This is one of the first reports in a Latin-American population dealing with these molecular markers and MI.


Se estudiaron ocho polimorfismos comunes asociados como factores de riesgo para el infarto al miocardio (IM):factor V Leiden (FVL),factor VHR2 (FVHR2), factor II 20210G>A (FII),factor VII IVS7 (FVII IVS7), factor VIIArg353Gln (FVII),factor XIIIVal34Leu (FXIII), metilentetrahidrofolato reductase C677T (MTHFR), enzima convertidora de la angiotensina (ACE) y factores ambientales de riesgo,en pacientes costarricenses.Este es un estudio de casos y controles,donde participan 186 pacientes,95 de ellos con edades <45 años y 201 sujetos controles.Se utilizó la técnica de reacción en cadena de la polimerasa (PCR)y por medio de entrevistas personales se recolectó información epidemiológica adicional.Se encontró que la hipercolesterolemia y el fumado estan asociados como factores de riesgo en los pacientes jóvenes.Niveles elevados del fibrinógeno fueron detectados como un factor de riesgo importante y se observo interacción entre fumado y estos valores aumentados de fibrinógeno. El genotipo 34LeuLeu del FXIII presentó un efecto protector significante mientras que los otros polimorfimos estudiados no mostraron diferencia estadísticamente significativa entre los casos y controles. Los polimorfismos del FVII y FXIII demostraron interación con el fibrinógeno,según el análisis estadístico aplicado. Se evidencia, la interación entre factores de riesgo común y ciertos polimorfismos (FVII;FXIII)en la patogénesis del IM.Este es uno de los primeros informes sobre estos marcadores moleculares y su asociación con IM en una población latinoamericana.


Subject(s)
Humans , Male , Female , Middle Aged , Myocardial Infarction/genetics , Polymorphism, Genetic , Case-Control Studies , Costa Rica , Genetic Predisposition to Disease , Genetic Markers/genetics , Risk Factors
4.
Rev Biol Trop ; 54(1): 1-11, 2006 Mar.
Article in English | MEDLINE | ID: mdl-18457169

ABSTRACT

Eight common polymorphisms of known myocardial infarction (MI) risk factors (factor V Leiden (FVL), factor V HR2 (FVHR2), factor II 20210G > A (FII), factor VII IVS7 (FVII IVS7), factor VII Arg353Gln (FVII), factor XIII Va134Leu (FXIII), Methylenetetrahydrofolate reductase C677T (MTHFR), Angiotensin Converting Enzyme (ACE)) and environmental risk factors were analyzed in a MI patients of Costa Rica. This case-control study included 186 MI subjects, 95 of them < or = 45 years and 201 age and sex matched controls. With the use of PCR method the polymorphisms were detected and through interviews additional information was collected. Hypercholesterolemia and smoking were associated with a significant risk in younger patients. High fibrinogen level was an important risk factor and interaction with smoking was detected. Mainly, the genotype 34LeuLeu of FXIII showed significant protective effect, (OR 0.32, 95% CI 0.13-0.80) while the other polymorphisms showed no significant difference between the cases and the controls. Carriers of FVII (OR 2.75, 95% CI 1.07-7.02) and FXIII (OR 4.20, 95% CI 2.03-8.67) polymorphisms showed interaction with fibrinogen in the statistical analysis. It was concluded that there was an important interaction between the common risk factors and the polymorphisms (FVII; FXIII) in the development of MI. This is one of the first reports in a Latin-American population dealing with these molecular markers and MI.


Subject(s)
Myocardial Infarction/genetics , Polymorphism, Genetic , Case-Control Studies , Costa Rica , Female , Genetic Markers/genetics , Genetic Predisposition to Disease , Humans , Male , Middle Aged , Risk Factors
5.
Invest Clin ; 46(4): 347-55, 2005 Dec.
Article in Spanish | MEDLINE | ID: mdl-16353542

ABSTRACT

The prevalence of hyperhomocysteinemia and C677T MTHFR polymorphism was studied in various ethnic groups from Western Venezuela (60 Wayuu Indians, 42 italian immigrants and 77 Venezuelan mestizos) in relation with the prevalence of hyperhomocysteinemia and the C677T MTHFR polymorphism. Homocysteinemia was determined by polarized fluorescence immunoassay in an IMX system, serum folate was measured by radioimmunoanalysis and the MTHFR genotype was determined by PCR and restriction analysis. Hyperhomocysteinemia was defined as a value over 2 SD above the mean value for normal MTHFR (CC677) in each group. The prevalence of MTHFR variants (C677T and 677TT) was elevated in all ethnic groups (78% among the wayuu, 76% among Italians and 63% among mestizos) with a significant association between the concentrations of homocysteine and the levels of serum folate among the wayuu (p < 0.0001) and the mestizos (p < 0.001) only. Hyperhomocysteinemia was associated with MTHFR variants in 23% of the wayuu (OR: 6.17, CI 95: 0.74-51.36), 9.5% of the Italians (OR: 0.93, CI 95: 0.085-10.10) and 20.7 of the Venezuelans mestizos (OR: 5.2, CI 95: 1.08-24.90, p > 0.03). There was no relationship between hyperhomocysteinemia and folate deficiency in any of the groups studied. In conclusion, despite a high prevalence of C677T MTHFR variants in these ethnic groups of western Venezuela, the lack of no evidence of hyperhomocysteinemia combined with folate deficiency may imply that the nutritional status of these groups plays an important role in the control of hyperhomocysteinemia as a risk factor for cardiovascular disease.


Subject(s)
Homocysteine/blood , Indians, South American , Methylenetetrahydrofolate Reductase (NADPH2)/genetics , Polymorphism, Genetic , Adolescent , Adult , Humans , Italy/ethnology , Middle Aged , Venezuela
6.
Invest. clín ; Invest. clín;46(4): 347-355, dec. 2005. tab
Article in Spanish | LILACS | ID: lil-419602

ABSTRACT

Con el propósito de establecer la prevalencia de la hiperhomocisteinemia y su relación con el polimorfismo de la metilentetrahidrofolato reductasa, se estudiaron tres grupos étnicos del Occidente de Venezuela, localizados en la región del Estado Zulia (60 individuos Wayuú en la alta Goajira venezolana, 42 inmigrantes italianos y 77 venezolanos mestizos). La homocisteína fue determinada por ensayo inmunoenzimático utilizando lámpara de flourescencia polarizada, el folato sérico fue medido por radioinmunoanálisis y el polimorfismo de la MTHFR se realizó mediante reacción en cadena de la polimerasa y análisis de restricción. Se encontró una alta proporción en las variantes de la MTHFR 677TT y C677TT en los indígenas wayuú (78 por ciento), italianos (76 por ciento) y mestizos venezolanos (63,6 por ciento), con asociación significativa entre los niveles altos de homocisteína y concentraciones menores de folato en los wayuú (p < 0,0001) y en los venezolanos mestizos (p < 0,001). Las variantes polimórficas de la MTHFR se asociaron con hiperhomocisteinemia en el 23,3 por ciento de los indígenas wayuú (OR: 6,17; IC 95: 0,74-51.36), el 9,5 por ciento de los italianos (OR: 0,93; IC 95: 0,085-10,10) y en el 20,7 por ciento de los mestizos venezolanos (OR: 5,2; IC 95: 1,08-24,90; p < 0,03). No se encontró asociación entre hiperhomocisteinemia y deficiencia de folato en ninguna de las poblaciones estudiadas. Se concluye que a pesar de una alta prevalencia de variantes para la MTHFR en los grupos étnicos estudiados, el factor nutricional juega un papel importante en el control de la hiperhomocisteinemia y sus posibles consecuencias cardiovasculares


Subject(s)
Humans , Male , Female , Ethnicity , Folic Acid , Homocysteine , Oxidoreductases , Genetics , Venezuela
7.
J Pediatr ; 146(1): 128-30, 2005 Jan.
Article in English | MEDLINE | ID: mdl-15644837

ABSTRACT

Intracranial hemorrhage (ICH) is a severe complication of Factor X (FX) deficiency. We report 6 homozygous patients with central nervous system (ICH) bleeds. Five patients are homozygous for the mutation Gly380Arg and one for the novel deletion Tyr163delAT. We describe the association of these mutations with ICH bleeding.


Subject(s)
Factor X Deficiency/complications , Factor X/genetics , Gene Deletion , Homozygote , Intracranial Hemorrhages/genetics , Mutation, Missense , Costa Rica , DNA Mutational Analysis , Factor X Deficiency/genetics , Female , Humans , Infant, Newborn , Male
8.
Am J Hum Biol ; 16(1): 82-6, 2004.
Article in English | MEDLINE | ID: mdl-14689519

ABSTRACT

Individuals belonging to six different Amerindian tribes and two African groups of Costa Rica were genotyped for factor V Leiden (FV), factor V haplotype HR2 (FV HR2), Factor II 20210G>A (FII), the methylenetetrahydrofolate reductase (MTHFR), factor VII polymorphisms (FVII IVS7, FVII R353Q), factor XIII (FXIII V34L), and the insertion/deletion (I/D) polymorphism of the gene of angiotensin converting enzyme (ACE). Clear differences in the prevalence were found and are first reported. The prevalence of some of the established genetic risk factors was low in Amerindians of Costa Rica (ACE) or even absent (FVL, FII), and others (MTHFR, FVHR2) had an extremely high prevalence. People of African origin carried very rare FVL or FII polymorphisms, but the DD genotype of ACE is the highest reported. Concerning the protective factors, the QQ genotype of FVII R353Q was absent in Amerindians, but the protective 7/7 genotype of FVII IVS7 frequently found. Novel alleles of FVII IVS7 (4, 8, and 9 monomers) were found. Intertribal heterogeneity was observed that may reflect the evolutionary history of these tribal groups and their admixture with other populations.


Subject(s)
Black People/genetics , Indians, Central American/genetics , Thrombosis/genetics , Acetylcholinesterase/genetics , Alleles , Costa Rica/epidemiology , Gene Frequency , Genetic Markers/physiology , Humans , Polymorphism, Genetic , Prevalence , Risk Factors , Thrombosis/ethnology
9.
Invest. clín ; Invest. clín;41(1): 26-36, mar. 2000. tab
Article in Spanish | LILACS | ID: lil-261534

ABSTRACT

La resistencia de la proteína C activa (RPCa) es el fenotipo común del factor V Leiden (Arg506G1n) reconocido como factor de riesgo trombótico. El objetivo del presente estudio fue determinar la prevalencia de RPCa y su asociación con el factor V Leiden en poblaciones indígena y negra del occidente de Venezuela, ya que hasta la presnte no hay publicaciones sobre esta asociación en grupos étnicos venezolanos. Se estudiaron 80 indígenas de la etnia Yukpa de la Sierra de Perijá y 91 individuos de raza negra habitantes de la región sureste del Lago de Maracaibo. La RPCa fue determinaad según el método de Dalhlback, modificado por Jorquera y col. y Trossaert y col y los resultados expresaron como n-PCa-SR (valor positivo menor e igual l0,75). Las muestras de sangre anticoagulada con EDTA fueron impregnadas en papel secante y procesada para la detección del factor V Leiden según técnicas estándar para PCR y de análisis de restricción, en el Institute of Human Genetics (Greisfswald, Alemania). No se encontró diferencia significativa entre la n-PCa-SR de los indígenas (X+-EE=1,13+-0,02; IC 95 por ciento=1,07-1,19) y el de los sujetos de raza negra (1,07+-0,02;IC 95 por ciento=1,03-1,12). La prevalencia de RPCa fue de 1,25 por ciento(1/80) en índigenas (el caso era heterocigoto para factor V Leiden) y 4,4 por ciento (4/91) en la raza negra( un individuo resultó ser heterocigoto para factor V Leiden). Ninguno de los pacientes con RPCa tenía antecedentes personales o familiares de trombosis. Esta investigación representa el primer informe sobre la asociación de RCPa y factor V leiden an aborígenes e individuos de raza negra venezolanos. Aunque entre los indígenas existe una alta endogamia no se puede descartar en ningunos de los grupos raciales la intervención de genes foráneos. El hallazgo de RPCa sin factor V Leiden (Arg506GIn) sugiere la presencia de una mutación diferente a la molécula del factor V. La determinación de la prevalencia de este fenotipo y su marcador molecular en diferentes grupos étnicos es importante para la interpretación de su papel como factores de riesgo para enfermedades trombóticas


Subject(s)
Humans , Male , Female , Black People/classification , Black People/genetics , Population , Protein C , Venezuela
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