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Vrablik M, Tichý L, Freiberger T, Blaha V, Satny M, Hubacek JA. Genetics of Familial Hypercholesterolemia: New Insights. Front Genet 2020; 11:574474. [PMID: 33133164 PMCID: PMC7575810 DOI: 10.3389/fgene.2020.574474] [Citation(s) in RCA: 53] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Accepted: 09/09/2020] [Indexed: 12/11/2022] Open
Abstract
Familial hypercholesterolemia (FH) is one of the most common monogenic diseases, leading to an increased risk of premature atherosclerosis and its cardiovascular complications due to its effect on plasma cholesterol levels. Variants of three genes (LDL-R, APOB and PCSK9) are the major causes of FH, but in some probands, the FH phenotype is associated with variants of other genes. Alternatively, the typical clinical picture of FH can result from the accumulation of common cholesterol-increasing alleles (polygenic FH). Although the Czech Republic is one of the most successful countries with respect to FH detection, approximately 80% of FH patients remain undiagnosed. The opportunities for international collaboration and experience sharing within international programs (e.g., EAS FHSC, ScreenPro FH, etc.) will improve the detection of FH patients in the future and enable even more accessible and accurate genetic diagnostics.
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Affiliation(s)
- Michal Vrablik
- 3rd Department of Internal Medicine, 1st Faculty of Medicine, Charles University, Prague, Czechia
| | - Lukas Tichý
- Centre of Molecular Biology and Gene Therapy, University Hospital, Brno, Czechia
| | - Tomas Freiberger
- Centre for Cardiovascular Surgery and Transplantation, Brno, and Faculty of Medicine, Masaryk University, Brno, Czechia
| | - Vladimir Blaha
- Internal Gerontometabolic Department, Charles University and University Hospital Hradec Kralove, Hradec Kralove, Czechia
| | - Martin Satny
- 3rd Department of Internal Medicine, 1st Faculty of Medicine, Charles University, Prague, Czechia
| | - Jaroslav A Hubacek
- 3rd Department of Internal Medicine, 1st Faculty of Medicine, Charles University, Prague, Czechia.,Experimental Medicine Centre, Institute for Clinical and Experimental Medicine, Prague, Czechia
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Overview of the current status of familial hypercholesterolaemia care in over 60 countries - The EAS Familial Hypercholesterolaemia Studies Collaboration (FHSC). Atherosclerosis 2019; 277:234-255. [PMID: 30270054 DOI: 10.1016/j.atherosclerosis.2018.08.051] [Citation(s) in RCA: 145] [Impact Index Per Article: 29.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/15/2018] [Revised: 08/30/2018] [Accepted: 08/31/2018] [Indexed: 01/07/2023]
Abstract
BACKGROUND AND AIMS Management of familial hypercholesterolaemia (FH) may vary across different settings due to factors related to population characteristics, practice, resources and/or policies. We conducted a survey among the worldwide network of EAS FHSC Lead Investigators to provide an overview of FH status in different countries. METHODS Lead Investigators from countries formally involved in the EAS FHSC by mid-May 2018 were invited to provide a brief report on FH status in their countries, including available information, programmes, initiatives, and management. RESULTS 63 countries provided reports. Data on FH prevalence are lacking in most countries. Where available, data tend to align with recent estimates, suggesting a higher frequency than that traditionally considered. Low rates of FH detection are reported across all regions. National registries and education programmes to improve FH awareness/knowledge are a recognised priority, but funding is often lacking. In most countries, diagnosis primarily relies on the Dutch Lipid Clinics Network criteria. Although available in many countries, genetic testing is not widely implemented (frequent cost issues). There are only a few national official government programmes for FH. Under-treatment is an issue. FH therapy is not universally reimbursed. PCSK9-inhibitors are available in ∼2/3 countries. Lipoprotein-apheresis is offered in ∼60% countries, although access is limited. CONCLUSIONS FH is a recognised public health concern. Management varies widely across countries, with overall suboptimal identification and under-treatment. Efforts and initiatives to improve FH knowledge and management are underway, including development of national registries, but support, particularly from health authorities, and better funding are greatly needed.
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Corral P, Geller AS, Polisecki EY, Lopez GI, Bañares VG, Cacciagiu L, Berg G, Hegele RA, Schaefer EJ, Schreier LE. Unusual genetic variants associated with hypercholesterolemia in Argentina. Atherosclerosis 2019; 277:256-261. [PMID: 30270055 DOI: 10.1016/j.atherosclerosis.2018.06.009] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Revised: 05/17/2018] [Accepted: 06/07/2018] [Indexed: 12/18/2022]
Abstract
BACKGROUND AND AIMS Marked hypercholesterolemia, defined as low density lipoprotein cholesterol (LDL-C) levels ≥ 190 mg/dL, may be due to LDLR, APOB, and PCSK9 variants. In a recent analysis, only 1.7% of cases had such variants. Our goal was to identify other potential genetic causes of hypercholesterolemia. METHODS In a total of 51,253 subjects with lipid testing, 3.8% had elevated total cholesterol >300 mg/dL and/or LDL-C≥190 mg/dL. Of these, 246 were further studied, and 69 without kidney, liver, or thyroid disease and who met Dutch Lipid Clinic Network criteria of ≥6 points had DNA sequencing done at the LDLR, APOB, PCSK9, APOE, LDLRAP1, STAP1, ABCG5, ABCG8, CYP27A1, LIPA, LIPC, LIPG, LPL, and SCARB1 gene loci and also had 10 SNP analysis for a weighted high LDL-C genetic risk score. RESULTS In the 69 subjects with genetic analyses, the following variants were observed in 37 subjects (53.6%): LDLR (n = 20, 2 novel), ABCG5/8 (n = 7, 2 novel), APOB (n = 3, 1 novel), CYP27A1 (n = 3, 1 novel), LIPA (n = 2, 1 novel), APOE (n = 2), LIPC (n = 1, novel), LIPG (n = 1, novel), and SCARB1 (n = 1); 14 subjects (20.3%) had a high polygenic score, with 4 (5.8%) having no variants. CONCLUSIONS Our data indicate that in addition to variants in LDLR, APOB, PCSK9, APOE, LDLRAP1, and STAP1, variants in ABCG5/8, CYP27A1, LIPA, LIPC, and LIPG may be associated with hypercholesterolemia and such information should be used to optimize therapy.
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Affiliation(s)
- Pablo Corral
- Departamento de Investigación, Facultad de Medicina, Universidad FASTA, Buenos Aires, Argentina
| | | | | | - Graciela I Lopez
- Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Departamento de Bioquímica Clínica, Laboratorio de Lípidos y Aterosclerosis, INFIBIOC-UBA, Buenos Aires, Argentina
| | - Virginia G Bañares
- Departamento de Genética Experimental, Centro Nacional de Genética Médica "Dr Eduardo Castilla", Administración Nacional de Laboratorios e Institutos de Salud "Dr Carlos Malbrán", Buenos Aires, Argentina
| | - Leonardo Cacciagiu
- Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Departamento de Bioquímica Clínica, Laboratorio de Lípidos y Aterosclerosis, INFIBIOC-UBA, Buenos Aires, Argentina
| | - Gabriela Berg
- Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Departamento de Bioquímica Clínica, Laboratorio de Lípidos y Aterosclerosis, INFIBIOC-UBA, Buenos Aires, Argentina
| | - Robert A Hegele
- Robarts Research Institute, University Western Ontario, London, Ontario, Canada
| | | | - Laura E Schreier
- Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Departamento de Bioquímica Clínica, Laboratorio de Lípidos y Aterosclerosis, INFIBIOC-UBA, Buenos Aires, Argentina.
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Lee C, Cui Y, Song J, Li S, Zhang F, Wu M, Li L, Hu D, Chen H. Effects of familial hypercholesterolemia-associated genes on the phenotype of premature myocardial infarction. Lipids Health Dis 2019; 18:95. [PMID: 30971288 PMCID: PMC6458678 DOI: 10.1186/s12944-019-1042-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Accepted: 04/01/2019] [Indexed: 01/08/2023] Open
Abstract
Background The incidence of premature myocardial infarction (PMI) has gradually increased in recent years. Genetics plays a central role in the development of PMI. Familial hypercholesterolemia (FH) is one of the most common genetic disorders of cholesterol metabolism leading to PMI. Objective This study investigated the relationship between FH-associated genes and the phenotype of PMI to clarify the genetic spectrum of PMI diseases. Method This study enrolled PMI patients (n = 225) and detected the mutations in their FH-associated genes (LDLR, APOB, PCSK9, LDLRAP1) by Sanger sequencing. At the same time, patients free of PMI (non-FH patients, n = 56) were enrolled as control, and a logistic regression analysis was used to identify risk factors associated with PMI. The diagnosis of FH was confirmed using “2018 Chinese expert consensus of FH screening and diagnosis” before the prevalence and clinical features of FH were analyzed. Results Pathogenic mutations in LDLR, APOB, PCSK9 and LDLRAP1 genes were found in 17 of 225 subjects (7.6%), and all mutations were loss of function (LOF) and heterozygous. The genotype-phenotype relationship of patients carrying FH-associated mutations showed high heterogeneity. The logistic regression analysis showed that the smoking history, obesity and the family history of premature CHD were independent risk factors of PMI. In this study, a total of 19 patients (8.4%) were diagnosed as FH, and the proportion of smoking subjects in FH patients was higher than that in non-FH patients. Conclusions FH-associated gene mutations were present in about 7.6% of Chinese patients with PMI. In addition to genetic factors, smoking history, lifestyle and other environmental factors may play a synergistic role in determining the phenotype of PMI. Trial registration Essential gene mutation of cholesterol metabolism in patients with premature myocardial infarction. ChiCTR-OCH-12002349.Registered 26 December 2014, http://www.chictr.org.cn/showproj.aspx?proj=7201.
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Affiliation(s)
- Chongyou Lee
- Department of Cardiology, Peking University People's Hospital, Xizhimen South Rd. No.11, Xicheng district, Beijing, 100044, China.,Beijing Key Laboratory of Early Prediction and Intervention of Acute Myocardial Infarction, Peking University People's Hospital, Beijing, China.,Center for Cardiovascular Translational Research, Peking University People's Hospital, Beijing, China
| | - Yuxia Cui
- Department of Cardiology, Peking University People's Hospital, Xizhimen South Rd. No.11, Xicheng district, Beijing, 100044, China.,Beijing Key Laboratory of Early Prediction and Intervention of Acute Myocardial Infarction, Peking University People's Hospital, Beijing, China.,Center for Cardiovascular Translational Research, Peking University People's Hospital, Beijing, China
| | - Junxian Song
- Department of Cardiology, Peking University People's Hospital, Xizhimen South Rd. No.11, Xicheng district, Beijing, 100044, China.,Beijing Key Laboratory of Early Prediction and Intervention of Acute Myocardial Infarction, Peking University People's Hospital, Beijing, China.,Center for Cardiovascular Translational Research, Peking University People's Hospital, Beijing, China
| | - Sufang Li
- Department of Cardiology, Peking University People's Hospital, Xizhimen South Rd. No.11, Xicheng district, Beijing, 100044, China.,Beijing Key Laboratory of Early Prediction and Intervention of Acute Myocardial Infarction, Peking University People's Hospital, Beijing, China.,Center for Cardiovascular Translational Research, Peking University People's Hospital, Beijing, China
| | - Feng Zhang
- Department of Cardiology, Peking University People's Hospital, Xizhimen South Rd. No.11, Xicheng district, Beijing, 100044, China.,Beijing Key Laboratory of Early Prediction and Intervention of Acute Myocardial Infarction, Peking University People's Hospital, Beijing, China.,Center for Cardiovascular Translational Research, Peking University People's Hospital, Beijing, China
| | - Manyan Wu
- Department of Cardiology, Peking University People's Hospital, Xizhimen South Rd. No.11, Xicheng district, Beijing, 100044, China.,Beijing Key Laboratory of Early Prediction and Intervention of Acute Myocardial Infarction, Peking University People's Hospital, Beijing, China.,Center for Cardiovascular Translational Research, Peking University People's Hospital, Beijing, China
| | - Long Li
- Department of Cardiology, Peking University People's Hospital, Xizhimen South Rd. No.11, Xicheng district, Beijing, 100044, China.,Beijing Key Laboratory of Early Prediction and Intervention of Acute Myocardial Infarction, Peking University People's Hospital, Beijing, China.,Center for Cardiovascular Translational Research, Peking University People's Hospital, Beijing, China
| | - Dan Hu
- Department of Cardiology, Peking University People's Hospital, Xizhimen South Rd. No.11, Xicheng district, Beijing, 100044, China.,Beijing Key Laboratory of Early Prediction and Intervention of Acute Myocardial Infarction, Peking University People's Hospital, Beijing, China.,Center for Cardiovascular Translational Research, Peking University People's Hospital, Beijing, China
| | - Hong Chen
- Department of Cardiology, Peking University People's Hospital, Xizhimen South Rd. No.11, Xicheng district, Beijing, 100044, China. .,Beijing Key Laboratory of Early Prediction and Intervention of Acute Myocardial Infarction, Peking University People's Hospital, Beijing, China. .,Center for Cardiovascular Translational Research, Peking University People's Hospital, Beijing, China.
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Sun D, Zhou BY, Li S, Sun NL, Hua Q, Wu SL, Cao YS, Guo YL, Wu NQ, Zhu CG, Gao Y, Cui CJ, Liu G, Li JJ. Genetic basis of index patients with familial hypercholesterolemia in Chinese population: mutation spectrum and genotype-phenotype correlation. Lipids Health Dis 2018; 17:252. [PMID: 30400955 PMCID: PMC6220500 DOI: 10.1186/s12944-018-0900-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2018] [Accepted: 10/24/2018] [Indexed: 11/18/2022] Open
Abstract
Background Although there have been many reports in the genetics of familial hypercholesterolemia (FH) worldwide, studies in regard of Chinese population are lacking. In this multi-center study, we aim to characterize the genetic spectrum of FH in Chinese population, and examine the genotype-phenotype correlations in detail. Methods A total of 285 unrelated index cases from China with clinical FH were consecutively recruited. Next-generation sequencing and bioinformatics tools were used for mutation detection of LDLR, APOB and PCSK9 genes and genetic analysis. Results Overall, the detection rate is 51.9% (148/285) in the unrelated index cases with a total of 119 risk variants identified including 84 in the LDLR gene, 31 in APOB and 4 in PCSK9 gene. Twenty-eight variants were found in more than one individual and LDLR c.1448G > A (p. W483X) was most frequent one detected in 9 patients. Besides, we found 8 (7 LDLR and 1 APOB) novel variants referred as “pathogenic (or likely pathogenic) variants” according to in silico analysis. In the phenotype analysis, patients with LDLR null mutation had significantly higher LDL cholesterol level than LDLR defective and APOB/PCSK9 mutation carriers and those with no mutations (p < 0.001). Furthermore, 13 double heterozygotes, 16 compound heterozygotes and 5 true LDLR homozygotes were identified and the true LDLR homozygotes had the most severe phenotypes. Conclusions The present study confirmed the heterogeneity of FH genetics in the largest Chinese cohort, which could replenish the knowledge of mutation spectrum and contribute to early screening and disease management.
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Affiliation(s)
- Di Sun
- Division of Dyslipidemia, State Key Laboratory of Cardiovascular Disease, Fu Wai Hospital, National Center for Cardiovascular Disease, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100037, China
| | - Bing-Yang Zhou
- Division of Dyslipidemia, State Key Laboratory of Cardiovascular Disease, Fu Wai Hospital, National Center for Cardiovascular Disease, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100037, China
| | - Sha Li
- Division of Dyslipidemia, State Key Laboratory of Cardiovascular Disease, Fu Wai Hospital, National Center for Cardiovascular Disease, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100037, China
| | - Ning-Ling Sun
- Department of Cardiology, Peking University People's Hospital, Beijing, 100044, China
| | - Qi Hua
- Department of Cardiology, Xuanwu Hospital, Capital Medical University, Beijing, 100053, China
| | - Shu-Lin Wu
- Guangdong Cardiovascular Institute, Guangdong Provincial Key Laboratory of Clinical Pharmacology, Guangzhou, 510080, China
| | - Yun-Shan Cao
- Department of Cardiology, Gansu Provincial People's Hospital, Lanzhou, 730000, Gansu, China
| | - Yuan-Lin Guo
- Division of Dyslipidemia, State Key Laboratory of Cardiovascular Disease, Fu Wai Hospital, National Center for Cardiovascular Disease, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100037, China
| | - Na-Qiong Wu
- Division of Dyslipidemia, State Key Laboratory of Cardiovascular Disease, Fu Wai Hospital, National Center for Cardiovascular Disease, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100037, China
| | - Cheng-Gang Zhu
- Division of Dyslipidemia, State Key Laboratory of Cardiovascular Disease, Fu Wai Hospital, National Center for Cardiovascular Disease, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100037, China
| | - Ying Gao
- Division of Dyslipidemia, State Key Laboratory of Cardiovascular Disease, Fu Wai Hospital, National Center for Cardiovascular Disease, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100037, China
| | - Chuan-Jue Cui
- Division of Dyslipidemia, State Key Laboratory of Cardiovascular Disease, Fu Wai Hospital, National Center for Cardiovascular Disease, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100037, China
| | - Geng Liu
- Division of Dyslipidemia, State Key Laboratory of Cardiovascular Disease, Fu Wai Hospital, National Center for Cardiovascular Disease, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100037, China
| | - Jian-Jun Li
- Division of Dyslipidemia, State Key Laboratory of Cardiovascular Disease, Fu Wai Hospital, National Center for Cardiovascular Disease, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100037, China.
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Pek SLT, Dissanayake S, Fong JCW, Lin MX, Chan EZL, Tang JIS, Lee CW, Ong HY, Sum CF, Lim SC, Tavintharan S. Spectrum of mutations in index patients with familial hypercholesterolemia in Singapore: Single center study. Atherosclerosis 2017; 269:106-116. [PMID: 29353225 DOI: 10.1016/j.atherosclerosis.2017.12.028] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/14/2017] [Revised: 12/13/2017] [Accepted: 12/21/2017] [Indexed: 02/08/2023]
Abstract
BACKGROUND AND AIMS Familial hypercholesterolemia (FH) is an autosomal dominant genetic disease characterized by the presence of high plasma low density lipoproteins cholesterol (LDL-c). Patients with FH, with mutation detected, are at increased risk of premature cardiovascular disease compared to those without mutations. The aim of the study was to assess the type of mutations in patients, clinically diagnosed with FH in Singapore. METHODS Patients (probands) with untreated/highest on-treatment LDL-c>4.9 mmol/l were recruited (June 2015 to April 2017). Anthropometric, biochemical indices, blood and family history were collected. DNA was extracted and Next Generation Sequencing (NGS) was performed in 26 lipid-related genes, including LDLR, APOB and PCSK9, and validated using Sanger. Multiplex-ligation probe analyses for LDLR were performed to identify large mutation derangements. Based on HGVS nomenclature, LDLR mutations were classified as "Null"(nonsense, frameshift, large rearrangements) and "Defective"(point mutations which are pathogenic). RESULTS Ninety-six probands were recruited: mean age: (33.5 ± 13.6) years. 52.1% (n = 50) of patients had LDLR mutations, with 15 novel mutations, and 4.2% (n = 4) had APOB mutations. Total cholesterol (TC) and LDL-c were significantly higher in those with LDLR mutations compared to APOB and no mutations [(8.53 ± 1.52) vs. (6.93 ± 0.47) vs. (7.80 ± 1.32)] mmol/l, p = 0.012 and [(6.74 ± 0.35) vs. (5.29 ± 0.76) vs. (5.98 ± 1.23)] mmol/l, p=0.005, respectively. Patients with "null LDLR" mutations (n = 13) had higher TC and LDL-c than "defective LDLR" mutations (n = 35): [(9.21 ± 1.60) vs. (8.33 ± 1.41)]mmol/l, p = 0.034 and [(7.43 ± 1.47) vs. (6.53 ± 1.21)]mmol/l, p=0.017, respectively. CONCLUSIONS To our knowledge, this is the first report of mutation detection in patients with clinically suspected FH by NGS in Singapore. While percentage of mutations is similar to other countries, the spectrum locally differs.
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Affiliation(s)
| | | | | | | | | | | | - Chee Wan Lee
- Cardiology, Khoo Teck Puat Hospital, 768828, Singapore
| | - Hean Yee Ong
- Cardiology, Khoo Teck Puat Hospital, 768828, Singapore
| | - Chee Fang Sum
- Diabetes Centre, Admiralty Medical Centre, 730676, Singapore; Division of Endocrinology, Khoo Teck Puat Hospital, 768828, Singapore
| | - Su Chi Lim
- Clinical Research Unit, Khoo Teck Puat Hospital, 768828, Singapore; Diabetes Centre, Admiralty Medical Centre, 730676, Singapore; Division of Endocrinology, Khoo Teck Puat Hospital, 768828, Singapore; Saw Swee Hock School of Public Health, National University Hospital, 117549, Singapore
| | - Subramaniam Tavintharan
- Clinical Research Unit, Khoo Teck Puat Hospital, 768828, Singapore; Diabetes Centre, Admiralty Medical Centre, 730676, Singapore; Division of Endocrinology, Khoo Teck Puat Hospital, 768828, Singapore.
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