Browsing by Author "Chora, J.R."
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- Analysis of publicly available LDLR, APOB, and PCSK9 variants associated with familial hypercholesterolemia: application of ACMG guidelines and implications for familial hypercholesterolemia diagnosisPublication . Chora, J.R.; Medeiros, A.M.; Alves, A.C.; Bourbon, M.PurposeFamilial hypercholesterolemia (FH) is an autosomal disorder of lipid metabolism presenting with increased cardiovascular risk. Although more than 1,700 variants have been associated with FH, the great majority have not been functionally proved to affect the low-density lipoprotein receptor cycle. We aimed to classify all described variants associated with FH and to establish the proportion of variants that lack evidence to support their pathogenicity.MethodsWe followed American College of Medical Genetics and Genomics (ACMG) guidelines for the classification, and collected information from a variety of databases and individual reports. A worldwide overview of publicly available FH variants was also performed.ResultsA total of 2,104 unique variants were identified as being associated with FH, but only 166 variants have been proven by complete in vitro functional studies to be causative of disease. Additionally, applying the ACMG guidelines, 1,097 variants were considered pathogenic or likely pathogenic. Only seven variants were found in all five continents.ConclusionThe lack of functional evidence for about 85% of all variants found in FH patients can compromise FH diagnosis and patient prognosis. ACMG classification improves variant interpretation, but functional studies are necessary to understand the effect of about 40% of all variants reported. Nevertheless, ACMG guidelines need to be adapted to FH for a better diagnosis.
- Analysis of publicly available LDLR, APOB, and PCSK9 variants associated with familial hypercholesterolemia: application of ACMG guidelines and implications for familial hypercholesterolemia diagnosisPublication . Chora, J.R.; Medeiros, A.M.; Alves, A.C.; Bourbon, M.Familial Hypercholesterolemia (FH): Lipid metabolism autosomal dominant condition; Patients present elevated low-density lipoprotein cholesterol (LDL-C) and total cholesterol (TC) values since birth - elevated cardiovascular risk.
- Cardiovascular risk estimation and management in Familial Hypercholesterolemia patientsPublication . Chora, J.R.; Medeiros, A.M.; Alves, A.C.; Bourbon, M.Objectives and study samples: - Estimate cardiovascular disease (CVD) risk; - What are the lipid-lowering therapy (LLT) strategies; - How many are reaching LDL-C targets; … in Familial Hypercholesterolemia (FH) patients and in the Portuguese general population
- Case-level data sharing makes a difference in variant classificationPublication . Chora, J.R.; Tichý, L.; Lacocca, M.A.; Freiberger, T.; Bourbon, M.The American College of Medical Genetics and Genomics guidelines for variant classification are composed of several evidence criteria that, when combined, lead to a 5-tier pathogenicity variant classification. Several criteria rely on case-level data from patients, relatives, or controls with or without a particular variant of interest. (...)
- Classification of genetic variants for clinical use – the case of Familial Hypercholesterolemia (Part 2): How to classify LDLR variantsPublication . Chora, J.R.Lecture about FH LDLR variants - classification of genetic variants for clinical use.
- Familial hypercholesterolemia in Portugal - lipid-lowering strategies and cardiovascular disease riskPublication . Chora, J.R.; Medeiros, A.M.; Alves, A.C.; Bourbon, M.Aims and study samples: Estimate cardiovascular disease (CVD) risk; What are the lipid-lowering therapy (LLT) strategies; How many are reaching LDL-C targets … in Familial Hypercholesterolemia (FH) patients and in the Portuguese general population.
- Familial Hypercholesterolemia Monogenic Polygenic or BothPublication . Medeiros, A.M.; Alves, A.C.; Chora, J.R.; Bourbon, M.The present work aims to determine the genetic cause (monogenic or polygenic) of hypercholesterolemia in clinical FH patients.
- 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.
- Genetic Analysis of Familial Hypercholesterolemia in Iberoamerican CountriesPublication . Chora, J.R.; Mata, P.; Santos, R.; Vázquez-Cárdenas, A.; Stoll, M.; Schreier, L.; Cuevas, A.; Alves, A.C.; Medeiros, A.M.; Perez Isla, L.; Jannes, C.; Pereira, A.; Dell'Oca, N.; Reyes, X.; Corral, P.; Bañares, V.; Magaña-Torres, T.; Aguilar-Salinas, C.; Alonso, R.; Bourbon, MafaldaThe Iberoamerican Familial Hypercholesterolemia network (IBAFH_N) was created in 2013 to promote awareness for Familial Hypercholesterolemia (FH) in these countries – Argentina, Brazil, Chile, Mexico, Portugal, Spain, Uruguay and more recently Colombia – that share a past and history. The aim of this work was to perform a molecular analysis of FH mutations in Iberoamerica.
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