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Alsabbagh YA, Ahmed SA, Salama HE, Abd-Elmawla MA, Elgendy HL. Role of low-density lipoprotein receptor rs5925 (1959C>T) gene polymorphism in pathogenesis of dyslipidemia among Egyptian lupus nephritis patients. Arch Rheumatol 2022; 37:584-592. [PMID: 36879570 PMCID: PMC9985366 DOI: 10.46497/archrheumatol.2022.9247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2021] [Accepted: 11/30/2021] [Indexed: 11/03/2022] Open
Abstract
Objectives This study aims to investigate the prevalence of low-density lipoprotein receptor (LDL-R) rs5925 genetic variants and to evaluate their relationship with plasma lipid and kidney functions in lupus nephritis patients. Patients and methods Between September 2020 and June 2021, a total of 100 lupus nephritis patients (8 males, 92 females; mean age: 31.1±1.1 years; range, 20 to 67 years) and a total of 100 age- and sex-matched healthy volunteers (10 males, 90 females; mean age: 35.8±2.8 years; range, 21 to 65 years) were included. The gene polymorphism rs5925 (LDLR) was performed by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP). Lipid profile and kidney functions were measured. Results Regarding rs5925 (LDLR), C allele was significantly higher among lupus nephritis patients (60%) compared to the control group (45%). While T allele was significantly lower in lupus nephritis patients (40%), compared to the control group (p=0.003). The plasma level of total cholesterol (TC), triglycerides (TG), and low-density lipoprotein cholesterol (LDL-C) were significantly lower in lupus nephritis patients with TT and CT genotypes, compared to those with CC genotype. Moreover, atherogenic index of plasma (AIP) and LDL-C/high-density lipoprotein cholesterol (HDL-C) ratio were significantly lower in patients with TT genotype, compared to the patients with CC genotype. There was a strong and clear association between patients with renal biopsies grades III & IV & V and LDLR C allele (p=0.01, p=0.003, and p=0.004, respectively). Conclusion C allele is the significantly prevailed LDLR C1959T variant among lupus nephritis patients. Moreover, LDL-R genetic variant may be one of the non-immunological mechanisms implicated in the disturbed lipid profile among lupus nephritis patients. Profound dyslipidemia may partly underscore the deterioration of kidney function among lupus nephritis patients.
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Affiliation(s)
- Yumn A Alsabbagh
- Department of Internal Medicine, Faculty of Medicine, Cairo University, Cairo, Egypt
| | - Saher A Ahmed
- Department of Internal Medicine, Faculty of Medicine, Cairo University, Cairo, Egypt
| | - Heba E Salama
- Department of Nephrology, Ahmed Maher Teaching Hospital, Cairo, Egypt
| | - Mai A Abd-Elmawla
- Department of Biochemistry, Faculty of Pharmacy, Cairo University, Cairo, Egypt
| | - Hala L Elgendy
- Department of Internal Medicine, Faculty of Medicine, Cairo University, Cairo, Egypt
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Rojas C, Ramírez H, Salazar LA, Kalergis AM, Gálvez AS, Escobar-Vera J. Characterization of LDLR rs5925 and PCSK9 rs505151 genetic variants frequencies in healthy subjects from northern Chile: Influence on plasma lipid levels. J Clin Lab Anal 2019; 33:e23001. [PMID: 31441123 PMCID: PMC6868413 DOI: 10.1002/jcla.23001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2019] [Revised: 07/17/2019] [Accepted: 07/19/2019] [Indexed: 12/15/2022] Open
Abstract
Background Identification and characterization of genetic variants and their effects on human health may allow to establish relationships between genetic background and susceptibility to developing cardiovascular diseases. LDLR and PCSK9 polymorphisms have been associated with higher lipid levels and risk of cardiovascular diseases. Thus, the main aim of this study was to evaluate genotype distribution and relative allelic frequency of LDLR rs5925 (1959C > T) and PCSK9 rs505151 (23968 A > G) genetic variants and their effects on lipid levels of healthy subjects from northern Chile. Methods A total of 178 healthy individuals were recruited for this study. The genotyping of rs5925 (LDLR) and rs505151 (PCSK9) polymorphisms was performed by PCR‐RFLP and qPCR, respectively. In addition, glucose and lipid levels were determined and associated with the genetic data. Results Genotype distribution for LDLR rs5925 polymorphism was as follows: CC = 19%; CT = 53%; and TT = 28% (HWE: χ2 = 0.80; P = .37), and for PCSK9 rs505151 genetic variant was as follows: AA = 93%; AG = 7%; and GG = 0% (HWE: χ2 = 0.22; P = .64). The frequency of T (rs5925) and G (rs505151) mutated alleles was 0.55 and 0.03, respectively. Data showed that individuals carrying LDLR mutated allele (T) presented lower values of total cholesterol, triglycerides, and LDL‐cholesterol when compared to CC homozygous genotype (P < .05). Subgroup analysis revealed that women carrying the PCSK9 mutated allele (G) exhibited higher values of total cholesterol, triglycerides, HDL‐C, and LDL‐C when compared to male group carrying the same genotype (P < .05). Conclusions The effect of LDLR rs5925 and PCSK9 rs505151 gene polymorphisms on lipid levels is associated with gender among healthy subjects from northern Chile.
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Affiliation(s)
- Claudio Rojas
- Laboratorio de Genética, Departamento Biomédico, Facultad de Ciencias de la Salud, Universidad de Antofagasta, Antofagasta, Chile
| | - Hugo Ramírez
- Laboratorio de Genética, Departamento Biomédico, Facultad de Ciencias de la Salud, Universidad de Antofagasta, Antofagasta, Chile
| | - Luis A Salazar
- Centro de Biología Molecular & Farmacogenética, Departamento de Ciencias Básicas, Facultad de Medicina, Universidad de La Frontera, Temuco, Chile
| | - Alexis M Kalergis
- Millennium Institute on Immunology and Immunotherapy (MIII), Departamento de Genética Molecular y Microbiología, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile.,Departamento de Endocrinología, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Anita S Gálvez
- Laboratorio de Genética, Departamento Biomédico, Facultad de Ciencias de la Salud, Universidad de Antofagasta, Antofagasta, Chile
| | - Jorge Escobar-Vera
- Laboratorio de Genética, Departamento Biomédico, Facultad de Ciencias de la Salud, Universidad de Antofagasta, Antofagasta, Chile
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Karabağ Y, Çağdaş M, Rencuzogullari I, Karakoyun S, Artaç İ, İliş D, Atalay E, Yesin M, Gürsoy MO, Halil Tanboğa I. Relationship between C-reactive protein/albumin ratio and coronary artery disease severity in patients with stable angina pectoris. J Clin Lab Anal 2018; 32:e22457. [PMID: 29667724 PMCID: PMC6816976 DOI: 10.1002/jcla.22457] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2018] [Accepted: 03/27/2018] [Indexed: 01/06/2023] Open
Abstract
BACKGROUND Syntax score (SS), which is an angiographic tool used in grading the complexity of coronary artery disease (CAD), has prognostic importance in coronary artery disease (CAD) and provides important information regarding selection of revascularization strategy. C-reactive protein (CRP) and albumin are indicators of inflammation, and high levels of them are associated with high SS. We aimed to investigate whether baseline CRP to albumin ratio C-Reactive Protein/Albumin Ratio (CAR), an easily available and novel inflammatory marker, is associated with SS. METHOD A total 403 consecutive patients with stabile angina pectoris, who underwent coronary angiography for suspected CAD from January 2015 to June 2016, were classified into two groups, low SS (≤22) and intermediate-high SS (>22). RESULTS C-Reactive Protein/Albumin Ratio was significantly higher in patients with intermediate-high SS group (P < .001). In multivariate regression analysis, CAR remained an independent predictor of intermediate-high SS group together with hypertension and LDL. The predictive performance of CAR, CRP, and albumin was compared by ROC curve analysis. CAR surpassed CRP and albumin in predicting intermediate-high SS group. CAR >6.3 predicted an intermediate-high SS with sensitivity and specificity of 86.8% and 43.4%, respectively. CONCLUSION C-Reactive Protein/Albumin Ratio was more tightly associated with the complexity and severity of CAD than CRP and albumin alone and was found to be an independent predictor for intermediate-high SS group.
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Affiliation(s)
- Yavuz Karabağ
- Department of CardiologyKafkas University Medical FacultyKarsTurkey
| | - Metin Çağdaş
- Department of CardiologyKafkas University Medical FacultyKarsTurkey
| | | | | | - İnanç Artaç
- Department of CardiologyKafkas University Medical FacultyKarsTurkey
| | - Doğan İliş
- Department of CardiologyKafkas University Medical FacultyKarsTurkey
| | - Eray Atalay
- Department of Internal MedicineKafkas University Medical FacultyKarsTurkey
| | - Mahmut Yesin
- Department of CardiologyKars Harakani State HospitalKarsTurkey
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LDLR , ApoB and ApoE genes polymorphisms and classical risk factors in premature coronary artery disease. Gene 2016; 590:263-9. [DOI: 10.1016/j.gene.2016.05.032] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2016] [Revised: 05/18/2016] [Accepted: 05/21/2016] [Indexed: 12/13/2022]
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de Almeida ERD, Reiche EMV, Kallaur AP, Flauzino T, Watanabe MAE. The roles of genetic polymorphisms and human immunodeficiency virus infection in lipid metabolism. BIOMED RESEARCH INTERNATIONAL 2013; 2013:836790. [PMID: 24319689 PMCID: PMC3844249 DOI: 10.1155/2013/836790] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/30/2013] [Revised: 09/02/2013] [Accepted: 09/11/2013] [Indexed: 12/31/2022]
Abstract
Dyslipidemia has been frequently observed among individuals infected with human immunodeficiency virus type 1 (HIV-1), and factors related to HIV-1, the host, and antiretroviral therapy (ART) are involved in this phenomenon. This study reviews the roles of genetic polymorphisms, HIV-1 infection, and highly active antiretroviral therapy (HAART) in lipid metabolism. Lipid abnormalities can vary according to the HAART regimen, such as those with protease inhibitors (PIs). However, genetic factors may also be involved in dyslipidemia because not all patients receiving the same HAART regimen and with comparable demographic, virological, and immunological characteristics develop variations in the lipid profile. Polymorphisms in a large number of genes are involved in the synthesis of structural proteins, and enzymes related to lipid metabolism account for variations in the lipid profile of each individual. As some genetic polymorphisms may cause dyslipidemia, these allele variants should be investigated in HIV-1-infected patients to identify individuals with an increased risk of developing dyslipidemia during treatment with HAART, particularly during therapy with PIs. This knowledge may guide individualized treatment decisions and lead to the development of new therapeutic targets for the treatment of dyslipidemia in these patients.
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Affiliation(s)
- Elaine Regina Delicato de Almeida
- Department of Pathology, Clinical Analysis and Toxicology, Health Sciences Center, State University of Londrina, Avenida Robert Koch, 60, CEP 86038-440 Londrina, PR, Brazil
- Pathological Sciences Postgraduate Program, Biological Sciences Center, State University of Londrina, Campus Universitário, CEP 86051-970 Londrina, PR, Brazil
| | - Edna Maria Vissoci Reiche
- Department of Pathology, Clinical Analysis and Toxicology, Health Sciences Center, State University of Londrina, Avenida Robert Koch, 60, CEP 86038-440 Londrina, PR, Brazil
| | - Ana Paula Kallaur
- Postgraduate Program of Health Sciences Center, State University of Londrina, Avenida Robert Koch, 60, CEP 86038-440 Londrina, PR, Brazil
| | - Tamires Flauzino
- Clinical Immunology, Clinical Analysis Laboratory, Health Sciences Center, State University of Londrina, Avenida Robert Koch, 60, CEP 86038-440 Londrina, PR, Brazil
| | - Maria Angelica Ehara Watanabe
- Department of Pathological Sciences, Biological Sciences Center, State University of Londrina, Campus Universitário, CEP 86051-970 Londrina, PR, Brazil
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APOE, MTHFR, LDLR and ACE Polymorphisms Among Angami and Lotha Naga Populations of Nagaland, India. J Community Health 2011; 36:975-85. [DOI: 10.1007/s10900-011-9397-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Long XJ, Yin RX, Li KL, Liu WY, Zhang L, Cao XL, Miao L, Wu DF, Htet Aung LH, Hu XJ. Low density lipoprotein receptor gene Ava II polymorphism and serum lipid levels in the Guangxi Bai Ku Yao and Han populations. Lipids Health Dis 2011; 10:34. [PMID: 21345210 PMCID: PMC3049747 DOI: 10.1186/1476-511x-10-34] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2011] [Accepted: 02/23/2011] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Several common genetic polymorphisms in the low density lipoprotein receptor (LDL-R) gene have associated with modifications of serum total cholesterol (TC) and low density lipoprotein cholesterol (LDL-C) levels, but the results are not consistent in different populations. Bai Ku Yao is a special subgroup of the Yao minority in China. The present study was undertaken to detect the association of LDL-R gene Ava Ⅱ polymorphism and serum lipid levels in the Guangxi Bai Ku Yao and Han populations. METHODS A total of 1024 subjects of Bai Ku Yao and 792 participants of Han Chinese were randomly selected from our previous stratified randomized cluster samples. Genotyping of the LDL-R gene Ava Ⅱ polymorphism was performed by polymerase chain reaction and restriction fragment length polymorphism combined with gel electrophoresis, and then confirmed by direct sequencing. RESULTS The levels of serum TC, high density lipoprotein cholesterol (HDL-C), LDL-C, apolipoprotein (Apo) A1 and the ratio of ApoA1 to ApoB were lower in Bai Ku Yao than in Han (P < 0.01 for all). The frequency of A⁻ and A+ alleles was 65.5% and 34.5% in Bai Ku Yao, and 80.7% and 19.3% in Han (P < 0.001); respectively. The frequency of A⁻A⁻, A⁻A+ and A+A+ genotypes was 42.6%, 45.9% and 11.5% in Bai Ku Yao, and 64.9%, 31.6% and 3.5% in Han (P < 0.001); respectively. There was also significant difference in the genotypic frequencies between males and females in Bai Ku Yao (P <0.05), and in the genotypic and allelic frequencies between normal LDL-C (≤ 3.20 mmol/L) and high LDL-C (> 3.20 mmol/L) subgroups in Bai Ku Yao (P < 0.05 for each) and between males and females in Han (P < 0.05 for each). The levels of LDL-C in males and TC and HDL-C in females were different among the three genotypes (P < 0.05 for all) in Bai Ku Yao, whereas the levels of HDL-C in males and HDL-C and ApoA1 in females were different among the three genotypes (P < 0.05-0.001) in Han. The subjects with A+A+ genotype had higher serum LDL-C, TC, HDL-C or ApoA1 levels than the subjects with A-A+ and A⁻A⁻ genotypes. Spearman rank correlation analysis revealed that the levels of LDL-C in Bai Ku Yao and HDL-C in Han were correlated with genotypes (P < 0.05 and P < 0.01; respectively). CONCLUSIONS The association of LDL-R gene Ava Ⅱ polymorphism and serum lipid levels is different between the Bai Ku Yao and Han populations. The discrepancy might partly result from different LDL-R gene Ava Ⅱ polymorphism or LDL-R gene-environmental interactions.
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Affiliation(s)
- Xing-Jiang Long
- Department of Cardiology, Institute of Cardiovascular Diseases, the First Affiliated Hospital, 22 Shuangyong Road, Nanning 530021, Guangxi, People's Republic of China
| | - Rui-Xing Yin
- Department of Cardiology, Institute of Cardiovascular Diseases, the First Affiliated Hospital, 22 Shuangyong Road, Nanning 530021, Guangxi, People's Republic of China
| | - Ke-La Li
- Department of Cardiology, Institute of Cardiovascular Diseases, the First Affiliated Hospital, 22 Shuangyong Road, Nanning 530021, Guangxi, People's Republic of China
| | - Wan-Ying Liu
- Department of Cardiology, Institute of Cardiovascular Diseases, the First Affiliated Hospital, 22 Shuangyong Road, Nanning 530021, Guangxi, People's Republic of China
| | - Lin Zhang
- Department of Cardiology, Institute of Cardiovascular Diseases, the First Affiliated Hospital, 22 Shuangyong Road, Nanning 530021, Guangxi, People's Republic of China
| | - Xiao-Li Cao
- Department of Cardiology, Institute of Cardiovascular Diseases, the First Affiliated Hospital, 22 Shuangyong Road, Nanning 530021, Guangxi, People's Republic of China
| | - Lin Miao
- Department of Cardiology, Institute of Cardiovascular Diseases, the First Affiliated Hospital, 22 Shuangyong Road, Nanning 530021, Guangxi, People's Republic of China
| | - Dong-Feng Wu
- Department of Cardiology, Institute of Cardiovascular Diseases, the First Affiliated Hospital, 22 Shuangyong Road, Nanning 530021, Guangxi, People's Republic of China
| | - Lynn Htet Htet Aung
- Department of Cardiology, Institute of Cardiovascular Diseases, the First Affiliated Hospital, 22 Shuangyong Road, Nanning 530021, Guangxi, People's Republic of China
| | - Xi-Jiang Hu
- Department of Cardiology, Institute of Cardiovascular Diseases, the First Affiliated Hospital, 22 Shuangyong Road, Nanning 530021, Guangxi, People's Republic of China
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Nakazone MA, De Marchi MA, Pinhel MAS, Barros CFDC, Júlio MAF, Pinheiro A, Arazi SS, Hotta JK, Hirata MH, Hirata RDC, Dos Santos JE, Souza DRS. Effects of APOE, APOB and LDLR variants on serum lipids and lack of association with xanthelasma in individuals from Southeastern Brazil. Genet Mol Biol 2009; 32:227-33. [PMID: 21637672 PMCID: PMC3036912 DOI: 10.1590/s1415-47572009005000028] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2008] [Accepted: 11/04/2008] [Indexed: 11/22/2022] Open
Abstract
Xanthelasma might be a clinical manifestation of dyslipidemia, a recognized risk factor for coronary artery disease. We investigated the association of apolipoprotein E (APOE HhaI), apolipoprotein B (APOB XbaI and Ins/Del) and LDL receptor (LDLR AvaII and HincII) gene polymorphisms with lipid profiles in 100 Brazilians with xanthelasma and 100 controls. Allele frequencies were similar in both groups. APOE, APOB and LDLR genotypes were not correlated with differences in the serum lipid profile. In individuals with xanthelasma, the APOB D allele was associated with less chance of having increased LDL-cholesterol (O.R. = 0.16, CI95% = 0.03-0.94, p = 0.042). In the control group, the APOB X+ allele was associated with less chance of having both increased total cholesterol (O.R. = 0.16, CI95% = 0.03-0.78, p = 0.023) and increased LDL-cholesterol (O.R. = 0.10, CI95% = 0.02-0.60, p = 0.012). Moreover, there was a significantly higher frequency of control individuals (68%) with elevated serum triglyceride levels, compared to patients (48%, p = 0.008). On the other hand, triglyceride levels in controls also seemed to be influenced by all other gene polymorphisms studied, an effect that might be enhanced by environmental factors.
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Affiliation(s)
- Marcelo A Nakazone
- Departamento de Biologia Molecular, Faculdade de Medicina de São José do Rio Preto, São José do Rio Preto, SP Brazil
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Li H, Liu Z, Han Q, Li Y, Chen J. Association of genetic polymorphism of low-density lipoprotein receptor with chronic viral hepatitis C infection in Han Chinese. J Med Virol 2006; 78:1289-95. [PMID: 16927291 DOI: 10.1002/jmv.20693] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
To study the association between the Ava II polymorphism at the low-density lipoprotein receptor (LDL-R) gene exon 13 locus and chronic hepatitis C virus (HCV) infection in the Han Chinese, 84 chronic HCV-infected patients without anti-viral treatment, and 72 healthy blood donors were studied. Polymerase chain reaction combined with restriction fragment length polymorphism (PCR-RFLP) was used to detect the Ava II polymorphism at the LDL-R gene exon 13 locus. The comparisons of genotype distribution and allele frequency between chronic HCV-infected patients and healthy controls showed statistically significant differences (P = 0.045 and P = 0.036, respectively). Additionally, the minor allele frequency (MAF) C in the healthy controls was higher than that in the chronic HCV-infected patients group. There was no significant difference (P = 0.130) when the genotype distribution was compared between chronic HCV-infected patients with HCV viremia and those without HCV viremia. However, the comparisons of allele frequency between the two groups showed a statistically significant difference (P = 0.047), and the MAF C in HCV RNA negative group was significantly higher than that in HCV RNA positive group. There were no significant differences in genotype distribution and allele frequency of the Ava II restriction site at the LDL-R gene exon 13 locus between patients with chronic HCV infection and those with HCV-associated cirrhosis as well as between patients with normal serum alanine aminotransferase (ALT) and those with abnormal ALT levels. These results suggest that the Han Chinese have Ava II polymorphism at the LDL-R gene exon 13 locus. The Ava II polymorphism at the LDL-R gene exon 13 locus showed a statistically significant difference between chronic HCV-infected patients and healthy controls, indicating a significant contribution of the Ava II polymorphism in susceptibility to HCV infection in these patients. The MAF C in HCV RNA negative group was higher than that in HCV RNA positive group, suggesting that the Ava II polymorphism might also be associated with viremia in patients with HCV infection.
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Affiliation(s)
- Han Li
- Department of Infectious Diseases, First Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an, Shaanxi Province, China
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Lahoz C, Peña R, Mostaza JM, Laguna F, García-Iglesias MF, Taboada M, Pintó X. Baseline levels of low-density lipoprotein cholesterol and lipoprotein (a) and the AvaII polymorphism of the low-density lipoprotein receptor gene influence the response of low-density lipoprotein cholesterol to pravastatin treatment. Metabolism 2005; 54:741-7. [PMID: 15931608 DOI: 10.1016/j.metabol.2004.12.020] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
To investigate some individual and genetic factors that may influence the response of low-density lipoprotein cholesterol (LDL-C) to pravastatin treatment, we recruited 440 subjects with hypercholesterolemia (mean age, 57 years; 43% men) from 21 primary health care centers-outpatient clinics into a prospective, multicentered intervention trial. Pravastatin (20 mg/d) was prescribed for 16 weeks. The main outcome was the percentage variation in LDL-C concentration relative to baseline. Blood analyses and genotyping were performed centrally. The results indicated that LDL-C decreased by 20.5% (range, +21% to -66%) after pravastatin treatment. Baseline concentration of LDL-C (the higher the concentration, the greater the decrease), lipoprotein (a) levels (the lower the concentration, the greater the response), and Ava II polymorphism of the LDL-receptor gene significantly influenced the hypolipemic effect ( P < .001, P = .014, and P = .004, respectively). These 3 factors combined explained 10.6% of the variation in LDL-C response. Age, sex, smoking habit, alcohol consumption, body mass index, and apolipoprotein E genotype had no significant effect on response. We conclude that baseline levels of LDL-C and lipoprotein (a) together with the Ava II polymorphism of the LDL-receptor gene have a significant influence on the LDL-C response to pravastatin treatment in patients monitored in a standard primary health care outpatient clinic setting.
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Affiliation(s)
- Carlos Lahoz
- Unidad de Arteriosclerosis, Hospital Carlos III, 28029 Madrid, Spain.
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Cavalli SA, Hirata MH, Hirata RD. Rapid detection of 3500Q and 3531 mutations and MspI polymorphism in exon 26 at the apolipoprotein B gene. J Clin Lab Anal 2001; 15:35-9. [PMID: 11170232 PMCID: PMC6808027 DOI: 10.1002/1098-2825(2001)15:1<35::aid-jcla7>3.0.co;2-p] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2000] [Accepted: 08/11/2000] [Indexed: 11/10/2022] Open
Abstract
Several environmental and genetic factors are associated with high levels of cholesterol. Hypercholesterolemia is the main phenotype of Familial Defective Apolipoprotein B and Familial Hypercholesterolemia that are caused by mutations at the apolipoprotein (apo) B and LDL receptor genes, respectively. Identification of the specific genetic alteration associated with hypercholesterolemia is an important issue in clinical diagnosis of high risk for CAD. Apo B gene mutations and polymorphisms are usually screened by SSCP, DGGE, and heteroduplex, which must be confirmed by DNA sequencing or by direct detection using PCR techniques. In this study, we have optimized a PCR-RFLP procedure for identification of 3500Q and 3531 mutations and MspI polymorphism at the apo B gene. The technique can be performed in a single reaction, using the restriction endonuclease MspI for simultaneous detection of 3500Q mutation and MspI polymorphism, and NsiI for detection of 3531 mutation. The procedure was validated by analysis of control DNA samples from individuals carrying these mutations. Screening of 186 Brazilian hypercholesterolemic individuals showed that the frequency of the M-allele (7.8%) of MspI polymorphism was similar to that found in other individuals with CAD. However, neither 3500Q nor 3531 mutations were detected in this group. In conclusion, this procedure is simple and rapid, being easily introduced in clinical laboratories for direct detection of the more frequent mutations at the apo B gene associated with hypercholesterolemia.
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Affiliation(s)
- S A Cavalli
- Department of Clinical and Toxicological Analysis, Faculty of Pharmaceutical Sciences, Sao Paulo University, Sao Paulo, Brazil.
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Salazar LA, Cavalli SA, Hirata MH, Diament J, Forti N, Giannini SD, Nakandakare ER, Bertolami MC, Hirata RD. Polymorphisms of the low-density lipoprotein receptor gene in Brazilian individuals with heterozygous familial hypercholesterolemia. Braz J Med Biol Res 2000; 33:1301-4. [PMID: 11050659 DOI: 10.1590/s0100-879x2000001100006] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Familial hypercholesterolemia (FH) is a metabolic disorder inherited as an autosomal dominant trait characterized by an increased plasma low-density lipoprotein (LDL) level. The disease is caused by several different mutations in the LDL receptor gene. Although early identification of individuals carrying the defective gene could be useful in reducing the risk of atherosclerosis and myocardial infarction, the techniques available for determining the number of the functional LDL receptor molecules are difficult to carry out and expensive. Polymorphisms associated with this gene may be used for unequivocal diagnosis of FH in several populations. The aim of our study was to evaluate the genotype distribution and relative allele frequencies of three polymorphisms of the LDL receptor gene, HincII(1773) (exon 12), AvaII (exon 13) and PvuII (intron 15), in 50 unrelated Brazilian individuals with a diagnosis of heterozygous FH and in 130 normolipidemic controls. Genomic DNA was extracted from blood leukocytes by a modified salting-out method. The polymorphisms were detected by PCR-RFLP. The FH subjects showed a higher frequency of A+A+ (AvaII), H+H+ (HincII(1773)) and P1P1 (PvuII) homozygous genotypes when compared to the control group (P<0.05). In addition, FH probands presented a high frequency of A+ (0.58), H+ (0.61) and P1 (0.78) alleles when compared to normolipidemic individuals (0.45, 0.45 and 0.64, respectively). The strong association observed between these alleles and FH suggests that AvaII, HincII(1773) and PvuII polymorphisms could be useful to monitor the inheritance of FH in Brazilian families.
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Affiliation(s)
- L A Salazar
- Departamento de Análises Clínicas e Toxicológicas, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo, São Paulo, SP, Brasil.
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Salazar LA, Hirata MH, Giannini SD, Forti N, Diament J, Lima TM, Hirata RD. Seven DNA polymorphisms at the candidate genes of atherosclerosis in Brazilian women with angiographically documented coronary artery disease. Clin Chim Acta 2000; 300:139-49. [PMID: 10958870 DOI: 10.1016/s0009-8981(00)00308-9] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The possible association of genetic markers at the apolipoprotein E (HhaI polymorphism), apolipoprotein B (XbaI, EcoRI and Ins/Del polymorphisms), and low-density lipoprotein receptor (LDLR) (AvaII, HincII and PvuII polymorphisms) with coronary artery disease (CAD) was evaluated in 50 Brazilian women with CAD diagnosed by angiography and in 100 healthy women (controls). The frequency of E3/E4 genotype for HhaI polymorphism at the Apo E gene was significantly higher in CAD patients than in controls (40% vs. 14%, respectively, P<0.001). Similarly, the X-X- genotype for XbaI polymorphism was more frequent in CAD individuals than controls (42% vs. 12%, P<0.0001). The A+A+ and P1P1 genotypes for AvaII and PvuII polymorphisms at the LDLR locus were also higher in CAD subjects than controls (44% vs. 16%, P<0.001 and 64% vs. 39%, P<0.05, respectively). The estimated relative risks for CAD in women carrying the E3/E4, X-X-, A+A+ and P1P1 genotypes were 4.1 [95% confidence interval (CI), 3.0-5.6], 5.3 (95% CI, 3.8-7.5), 4.1 (95% CI, 3.0-5.5), and 2.8 (95% CI, 2.2-3.6), respectively. This study demonstrates that Apo E, Apo B and LDLR gene polymorphisms are associated with CAD in Brazilian Caucasian women.
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Affiliation(s)
- L A Salazar
- Department of Clinical and Toxicological Analysis, Faculty of Pharmaceutical Sciences, University of São Paulo, Av. Lineu Prestes 580, CEP 05508-900, SP, São Paulo, Brazil.
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Salazar LA, Hirata MH, Quint�o �C, Hirata RD. Lipid-lowering response of the HMG-CoA reductase inhibitor fluvastatin is influenced by polymorphisms in the low-density lipoprotein receptor gene in Brazilian patients with primary hypercholesterolemia. J Clin Lab Anal 2000. [DOI: 10.1002/(sici)1098-2825(2000)14:3<125::aid-jcla7>3.0.co;2-s] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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