Browsing by Author "Futema, M."
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- Applicability of the low-density lipoprotein cholesterol gene score in a south European populationPublication . Mariano, C.; Futema, M.; Humphries, S.E.; Bourbon, M.Aim: The correct identification of the dyslipidaemia is of great importance in order to implement specific interventions, especially for cardiovascular disease (CVD) prevention. The Global Lipids Genetics Consortium (GLGC) reported 158 loci associated with lipid traits, by genome-wide association studies (GWAS), although practical value of GWAS approach is still a subject of debate, half of these loci are previously known to influence serum lipid concentrations. Previous studies (Talmud et al., 2013; Futema et al., 2015) have demonstrated that the co-inheritance of low-density lipoprotein (LDLC)-raising alleles from 6 of these SNPs is associated with the Familial Hypercholesterolaemia (FH) phenotype. Here we investigated the applicability of the LDL-C genetic risk score in the Portuguese FH population.
- FH Phenotype: monogenic, polygenic and other causesPublication . Mariano, C.; Alves, A.C.; Medeiros, A.M.; Chora, J.R.; Futema, M.; Humphries, S.E.; Bourbon, M.Familial Hypercholesterolaemia (FH) is a monogenic lipid disorder caused by mutations in LDLR, APOB, and PCSK9 genes. However, 50% of individuals with clinical diagnosis of FH do not have a mutation in one of these three genes, so other causes for their phenotype must exist. The FH phenotype has been associated recently to other monogenic disorders as lysosomal acid lipase deficiency (LALD) and sitosterolaemia or can have a polygenic origin. The aim of this work was to characterize the origin of the FH phenotype in a cohort of patients with clinical diagnosis of FH.
- The applicability of the low-density lipoprotein cholesterol gene score in the Portuguese populationPublication . Mariano, C.; Futema, M.; Humphries, S.E.; Bourbon, M.Aim: The correct identification of the dyslipidaemia is of great importance in order to implement specific interventions, especially for cardiovascular disease (CVD) prevention. The Global Lipids Genetics Consortium (GLGC) reported 158 loci associated with lipid traits, by genome-wide association studies (GWAS), although practical value of GWAS approach is still a subject of debate, half of these loci are previously known to influence serum lipid concentrations. Previous studies (Talmud et al., 2013; Futema et al., 2015) have demonstrated that the co-inheritance of low-density lipoprotein (LDL-C)-raising alleles from 6 of these SNPs is associated with the Familial Hypercholesterolaemia (FH) phenotype. Here we investigated the applicability of the LDL-C genetic risk score in the Portuguese FH population.
- The familial hypercholesterolaemia phenotype: monogenic familial hypercholesterolaemia, polygenic hypercholesterolaemia and other causesPublication . Mariano, C.; Alves, A.C.; Medeiros, A.; Chora, J.R.; Antunes, M.; Futema, M.; Humphries, S.E.; Bourbon, M.Familial Hypercholesterolaemia (FH) is a monogenic disorder characterised by high LDL-C concentrations and increased cardiovascular risk. However, in clinically defined FH cohorts worldwide, an FH-causing variant is only found in 40-50% of the cases. The aim of this work was to characterise the genetic cause of the FH phenotype in Portuguese clinical FH patients. Methods and Results Between 1999 and 2017, 731 index patients (311 children and 420 adults) who met the Simon Broome diagnostic criteria had been referred to our laboratory. LDLR, APOB, PCSK9, APOE, LIPA, LDLRAP1, ABCG5/8 genes were analysed by PCR amplification and Sanger sequencing. The 6-SNP LDL-C genetic risk score (GRS) for polygenic hypercholesterolaemia was validated in the Portuguese population and cases with a GRS over the 25th percentile were considered to have a high likelihood of polygenic hypercholesterolaemia. An FH-causing mutation was found in 39% of patients (94% in LDLR, 5% APOB and 1% PCSK9), while at least 29% have polygenic hypercholesterolaemia and 1% have other lipid disorders. A genetic cause for the FH phenotype was found in 503 patients (69%). All known causes of the FH phenotype should be investigated in FH cohorts to ensure accurate diagnosis and appropriate management.
- The FH phenotype: monogenic familial hypercholesterolaemia, polygenic dyslipidaemia and other causesPublication . Mariano, C.; Medeiros, A.M.; Alves, A.C.; Chora, J.R.; Futema, M.; Humphries, S.E.; Antunes, M.; Bourbon, M.Introduction: (i) Cardiovascular disease (CVD), particularly coronary heart disease (CHD) and stroke, are the leading cause of morbidity and mortality worldwide; (ii) Dyslipidaemia is an important but modifiable cardiovascular risk factor. For instance, Familial Hypercholesterolaemia (FH) is a monogenic autosomal condition where patients present very high LDL-C values and an increase cardiovascular risk; (iii) FH is caused by mutations in 3 genes: LDLR, APOB and PCSK9. However in only about 40%-50% of the cases an FH causing mutation is found.
- The FH phenotype: monogenic familial hypercholesterolaemia, polygenic dyslipidaemia and other causesPublication . Mariano, C.; Antunes, M.; Medeiros, A.M.; Alves, A.C.; Futema, M.; Humphries, S.E.; Bourbon, MafaldaFamilial hypercholesterolaemia (FH) is a monogenic autosomal condition where patients present very high LDL-C values and an increase cardiovascular risk. FH is caused by mutations in 3 genes: LDLR, APOB and PCSK9. However in only about 40%-50% of the cases an FH causing mutation is found. The FH phenotype has been associated recently to other monogenic disorders as lysosomal acid lipase deficiency or can have a polygenic origin. The aim of this work was to characterize the origin of FH phenotype in a cohort of patients with a clinical diagnosis of FH.