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Arandhara VL, McClure CP, Tarr AW, Chappell S, Morgan K, Baumert TF, Irving WL, Ball JK. Scavenger receptor class B type I genetic variants associated with disease severity in chronic hepatitis C virus infection. J Med Virol 2023; 95:e28331. [PMID: 36415047 PMCID: PMC10100136 DOI: 10.1002/jmv.28331] [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: 08/30/2022] [Revised: 11/15/2022] [Accepted: 11/20/2022] [Indexed: 11/24/2022]
Abstract
Analysis of host genetic polymorphisms is an increasingly important tool for understanding and predicting pathogenesis and treatment response of viral diseases. The gene locus of scavenger receptor class B type I (SR-BI), encoding a cell entry factor and receptor for hepatitis C virus (HCV), contains several genetic polymorphisms. We applied a probe extension assay to determine the frequency of six single nucleotide polymorphisms (SNPs) within the SR-BI gene locus in 374 individuals with history of HCV infection. In addition, SR-BI messenger RNA (mRNA) levels were analyzed in liver biopsy specimens of chronically infected HCV subjects. The rs5888 variant allele T was present at a higher frequency in subjects with advanced fibrosis (χ2 , p = 0.016) and after adjusting for age, duration of infection and alcohol intake as confounding factors. Haplotype analysis of SNP frequencies showed that a haplotype consisting of rs61932577 variant allele C and rs5888 variant allele T was associated with an increased risk of advanced liver fibrosis (defined by an Ishak score 4-6) (adjusted odds ratio 2.81; 95% confidence interval 1.06-7.46. p = 0.038). Carriers of the rs5888 variant allele T displayed reduced SR-BI mRNA expression in liver biopsy specimens. In conclusion the rs5888 polymorphism variant is associated with decreased SR-BI expression and an increased risk of development of advanced fibrosis in chronic HCV infection. These findings provide further evidence for a role of SR-BI in HCV pathogenesis and provides a genetic marker for prediction of those infected individuals at greater risk of developing severe disease.
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Affiliation(s)
- Victoria L Arandhara
- School of Life Sciences, The University of Nottingham, Queen's Medical Centre, Nottingham, UK
| | - Charles Patrick McClure
- School of Life Sciences, The University of Nottingham, Queen's Medical Centre, Nottingham, UK.,Wolfson Centre for Global Virus Research, The University of Nottingham, Queen's Medical Centre, Nottingha, UK.,NIHR Nottingham Biomedical Research Centre at the Nottingham University Hospitals NHS Trust and University of Nottingham, Nottingham, UK
| | - Alexander W Tarr
- School of Life Sciences, The University of Nottingham, Queen's Medical Centre, Nottingham, UK.,Wolfson Centre for Global Virus Research, The University of Nottingham, Queen's Medical Centre, Nottingha, UK.,NIHR Nottingham Biomedical Research Centre at the Nottingham University Hospitals NHS Trust and University of Nottingham, Nottingham, UK
| | - Sally Chappell
- School of Life Sciences, The University of Nottingham, Queen's Medical Centre, Nottingham, UK
| | - Kevin Morgan
- School of Life Sciences, The University of Nottingham, Queen's Medical Centre, Nottingham, UK
| | - Thomas F Baumert
- Institut de Recherche sur les Maladies Virales et Hépatiques, Université de Strasbourg, Inserm, Strasbourg, France.,IHU Strasbourg, Pôle hépato-digestif, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - William L Irving
- School of Life Sciences, The University of Nottingham, Queen's Medical Centre, Nottingham, UK.,Wolfson Centre for Global Virus Research, The University of Nottingham, Queen's Medical Centre, Nottingha, UK.,NIHR Nottingham Biomedical Research Centre at the Nottingham University Hospitals NHS Trust and University of Nottingham, Nottingham, UK
| | - Jonathan K Ball
- School of Life Sciences, The University of Nottingham, Queen's Medical Centre, Nottingham, UK.,Wolfson Centre for Global Virus Research, The University of Nottingham, Queen's Medical Centre, Nottingha, UK.,NIHR Nottingham Biomedical Research Centre at the Nottingham University Hospitals NHS Trust and University of Nottingham, Nottingham, UK
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Patten DA, Wilkinson AL, O'Keeffe A, Shetty S. Scavenger Receptors: Novel Roles in the Pathogenesis of Liver Inflammation and Cancer. Semin Liver Dis 2022; 42:61-76. [PMID: 34553345 PMCID: PMC8893982 DOI: 10.1055/s-0041-1733876] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The scavenger receptor superfamily represents a highly diverse collection of evolutionarily-conserved receptors which are known to play key roles in host homeostasis, the most prominent of which is the clearance of unwanted endogenous macromolecules, such as oxidized low-density lipoproteins, from the systemic circulation. Members of this family have also been well characterized in their binding and internalization of a vast range of exogenous antigens and, consequently, are generally considered to be pattern recognition receptors, thus contributing to innate immunity. Several studies have implicated scavenger receptors in the pathophysiology of several inflammatory diseases, such as Alzheimer's and atherosclerosis. Hepatic resident cellular populations express a diverse complement of scavenger receptors in keeping with the liver's homeostatic functions, but there is gathering interest in the contribution of these receptors to hepatic inflammation and its complications. Here, we review the expression of scavenger receptors in the liver, their functionality in liver homeostasis, and their role in inflammatory liver disease and cancer.
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Affiliation(s)
- Daniel A. Patten
- National Institute for Health Research Birmingham Liver Biomedical Research Unit, Institute of Immunology and Immunotherapy, University of Birmingham, Birmingham, United Kingdom
- Centre for Liver and Gastrointestinal Research, Institute of Immunology and Immunotherapy, University of Birmingham, Birmingham, United Kingdom
| | - Alex L. Wilkinson
- National Institute for Health Research Birmingham Liver Biomedical Research Unit, Institute of Immunology and Immunotherapy, University of Birmingham, Birmingham, United Kingdom
- Centre for Liver and Gastrointestinal Research, Institute of Immunology and Immunotherapy, University of Birmingham, Birmingham, United Kingdom
| | - Ayla O'Keeffe
- National Institute for Health Research Birmingham Liver Biomedical Research Unit, Institute of Immunology and Immunotherapy, University of Birmingham, Birmingham, United Kingdom
- Centre for Liver and Gastrointestinal Research, Institute of Immunology and Immunotherapy, University of Birmingham, Birmingham, United Kingdom
| | - Shishir Shetty
- National Institute for Health Research Birmingham Liver Biomedical Research Unit, Institute of Immunology and Immunotherapy, University of Birmingham, Birmingham, United Kingdom
- Centre for Liver and Gastrointestinal Research, Institute of Immunology and Immunotherapy, University of Birmingham, Birmingham, United Kingdom
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Zago VHS, Scherrer DZ, Parra ES, Vieira IC, Marson FAL, de Faria EC. Effects of SNVs in ABCA1, ABCG1, ABCG5, ABCG8, and SCARB1 Genes on Plasma Lipids, Lipoproteins, and Adiposity Markers in a Brazilian Population. Biochem Genet 2021; 60:822-841. [PMID: 34505223 DOI: 10.1007/s10528-021-10131-1] [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: 11/10/2020] [Accepted: 08/25/2021] [Indexed: 10/20/2022]
Abstract
Several proteins are involved in cholesterol homeostasis, as scavenger receptor class B type I and ATP-binding cassette (ABC) transporters including ABCA1, ABCG1, ABCG5, and ABCG8. This study aimed to determine the effects of single nucleotide variants (SNVs) rs2275543 (ABCA1), rs1893590 (ABCG1), rs6720173 (ABCG5), rs6544718 (ABCG8), and rs5888 (SCARB1) on plasma lipids, lipoproteins, and adiposity markers in an asymptomatic population and its sex-specific effects. Volunteers (n = 590) were selected and plasma lipids, lipoproteins, and adiposity markers (waist-to-hip and waist-to-height ratios, lipid accumulation product and body adiposity index) were measured. Genomic DNA was isolated from peripheral blood cells according to the method adapted from Gross-Bellard. SNVs were detected in the TaqMan® OpenArray® Real-Time polymerase chain reaction platform and data analyses were performed using the TaqMan® Genotyper Software. The rs2275543*C point to an increase of high-density lipoprotein size in females while in males very-low-density lipoprotein, cholesterol, and triglycerides were statistically lower (P value < 0.05). The rs1893590*C was statistically associated with lower apolipoprotein A-I levels and higher activities of paraoxonase-1 and cholesteryl ester transfer protein (P value < 0.05). The rs6720173 was statistically associated with an increase in cholesterol and low-density lipoprotein cholesterol in males; moreover, rs6544718*T reduced adiposity markers in females (P value < 0.05). Regarding the rs5888, a decreased adiposity marker in the total population and in females occurred (P value < 0.05). Multivariate analysis of variance showed that SNVs could influence components of high-density lipoprotein metabolism, mainly through ABCG1 (P value < 0.05). The ABCA1 and ABCG5 variants showed sex-specific effects on lipids and lipoproteins, while SCARB1 and ABCG8 variants might influence adiposity markers in females. Our data indicate a possible role of ABCG1 on HDL metabolism.
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Affiliation(s)
- Vanessa Helena Souza Zago
- Department of Clinical Pathology, Faculty of Medical Sciences, State University of Campinas, Tessália Vieira de Camargo St, 126, Campinas, São Paulo, 13084-971, Brazil
| | - Daniel Zanetti Scherrer
- Department of Clinical Pathology, Faculty of Medical Sciences, State University of Campinas, Tessália Vieira de Camargo St, 126, Campinas, São Paulo, 13084-971, Brazil
| | - Eliane Soler Parra
- Department of Cardiology, Faculty of Medical Sciences, State University of Campinas, Tessália Vieira de Camargo St, 126, Campinas, São Paulo, 13084-971, Brazil
| | - Isabela Calanca Vieira
- Department of Clinical Pathology, Faculty of Medical Sciences, State University of Campinas, Tessália Vieira de Camargo St, 126, Campinas, São Paulo, 13084-971, Brazil
| | - Fernando Augusto Lima Marson
- Department of Pediatrics, Faculty of Medical Sciences, State University of Campinas, Tessália Vieira de Camargo St, 126, Campinas, São Paulo, 13084-971, Brazil. .,Department of Medical Genetics and Genomic Medicine, Faculty of Medical Sciences, State University of Campinas, Tessália Vieira de Camargo St, 126, Campinas, São Paulo, 13084-971, Brazil. .,Laboratory of Human and Medical Genetics and Laboratory of Cell and Molecular Tumor Biology and Bioactive Compounds, Post Graduate Program in Health Science, São Francisco University, Avenida São Francisco de Assis, 218, Jardim São José, Bragança Paulista, São Paulo, 12916-900, Brazil.
| | - Eliana Cotta de Faria
- Department of Clinical Pathology, Faculty of Medical Sciences, State University of Campinas, Tessália Vieira de Camargo St, 126, Campinas, São Paulo, 13084-971, Brazil.
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IFNL4 haplotype, linkage disequilibrium and their influence on virological response to hepatitis C virus infection in Indian population. Virusdisease 2019; 30:344-353. [DOI: 10.1007/s13337-019-00535-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2019] [Accepted: 06/15/2019] [Indexed: 10/26/2022] Open
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Wu CC, Hsu CS. Rescue for interferon failures in HCV genotype 1/HBV dually infection. J Formos Med Assoc 2018; 117:859-860. [PMID: 30146009 DOI: 10.1016/j.jfma.2018.06.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2018] [Accepted: 06/12/2018] [Indexed: 10/28/2022] Open
Affiliation(s)
- Chao-Chuan Wu
- Division of General Surgery, Department of Surgery, Taipei Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, New Taipei City 23142, Taiwan
| | - Ching-Sheng Hsu
- Liver Diseases Research Center, Taipei Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, New Taipei City 23142, Taiwan; School of Post-Baccalaureate Chinese Medicine, Tzu Chi University, Hualien 97002, Taiwan.
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Mobasheri S, Irani N, Sepahi AA, Sakhaee F, Jamnani FR, Vaziri F, Siadat SD, Fateh A. Evaluation of TRIM5 and TRIM22 polymorphisms on treatment responses in Iranian patients with chronic hepatitis C virus infection. Gene 2018; 676:95-100. [PMID: 30017737 DOI: 10.1016/j.gene.2018.07.023] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2018] [Revised: 07/05/2018] [Accepted: 07/10/2018] [Indexed: 12/15/2022]
Abstract
The tripartite motif (TRIM)-5 and TRIM22 are involved in innate immune response and show anti-viral activities. The current study aimed at evaluating the association of TRIM5 and TRIM22 polymorphisms with treatment outcomes in patients with chronic hepatitis C virus (CHC). TRIM5 rs3824949 and TRIM22 polymorphisms (rs7113258, rs7935564, and rs1063303) were genotyped using TaqMan polymerase chain reaction (PCR) assay in 425 treatment-naïve CHC patients. Rapid virological response (RVR), early virological response (EVR), and sustained virological response (SVR) were found in 54.1%, 74.8%, and 67.1% of the patients, respectively. RVR and SVR were associated with TRIM5 rs3824949 (GG), TRIM22 rs1063303 (GC), and TRIM22 rs7113258 (AA), while there was a relationship between TRIM5 rs3824949 (GG) and EVR. TRIM5 and TRIM22 single nucleotide polymorphisms (SNPs) were strongly associated with increased odds of RVR, EVR, and SVR after an interferon-based therapy in patients with CHC.
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Affiliation(s)
- Setareh Mobasheri
- Department of Microbiology, Faculty of Biology, North Tehran Branch, Islamic Azad University, Tehran, Iran
| | - Nazanin Irani
- Department of Microbiology, Faculty of Biology, North Tehran Branch, Islamic Azad University, Tehran, Iran
| | - Abbas Akhavan Sepahi
- Department of Microbiology, Faculty of Biology, North Tehran Branch, Islamic Azad University, Tehran, Iran
| | - Fatemeh Sakhaee
- Department of Mycobacteriology and Pulmonary Research, Pasteur Institute of Iran, Tehran, Iran
| | - Fatemeh Rahimi Jamnani
- Department of Mycobacteriology and Pulmonary Research, Pasteur Institute of Iran, Tehran, Iran; Microbiology Research Center (MRC), Pasteur Institute of Iran, Tehran, Iran
| | - Farzam Vaziri
- Department of Mycobacteriology and Pulmonary Research, Pasteur Institute of Iran, Tehran, Iran; Microbiology Research Center (MRC), Pasteur Institute of Iran, Tehran, Iran
| | - Seyed Davar Siadat
- Department of Mycobacteriology and Pulmonary Research, Pasteur Institute of Iran, Tehran, Iran; Microbiology Research Center (MRC), Pasteur Institute of Iran, Tehran, Iran
| | - Abolfazl Fateh
- Department of Mycobacteriology and Pulmonary Research, Pasteur Institute of Iran, Tehran, Iran; Microbiology Research Center (MRC), Pasteur Institute of Iran, Tehran, Iran.
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Nafari M, Irani S, Vaziri F, Gharibzadeh S, Sakhaee F, Khazeni M, Kalhor N, Jamnani FR, Siadat SD, Fateh A. Correlation of CD81 and SCARB1 polymorphisms on virological responses in Iranian patients with chronic hepatitis C virus genotype 1. INFECTION GENETICS AND EVOLUTION 2018; 62:296-303. [PMID: 29715527 DOI: 10.1016/j.meegid.2018.04.038] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2018] [Revised: 04/23/2018] [Accepted: 04/27/2018] [Indexed: 12/11/2022]
Abstract
The cluster of differentiation 81 (CD81) and scavenger receptor class B member 1 (SCARB1) plays an important role in the entry of hepatitis C virus (HCV). We assessed the correlation of five single nucleotide polymorphisms (SNPs) of CD81 (rs800136, rs2651842, rs2522012, rs800146, and rs708564) and SCARB1 rs10846744 polymorphisms with treatment responses in 395 treatment-naïve patients with chronic HCV (CHC) genotype 1 treated with pegylated interferon-α and ribavirin (pegIFN-α/RBV). The frequency of rapid virologic response (RVR), complete early virologic response (cEVR) and sustained virologic response (SVR) were 57.2%, 55.2%, and 58.2%, respectively. RVR, cEVR, and SVR were significantly associated with CD81 rs800136 (CC), CD81 rs2651842 (AA), CD81 rs708564 (TT), and SCARB1 rs10846744 (CC). High rates of RVR, cEVR, and SVR were reported for the CD81 rs800136 (CC), CD81 rs2651842 (AA), and CD81 rs708564 (TT) genotypes when correlated with higher levels of low-density lipoprotein (LDL) and lower levels of high-density lipoprotein (HDL) as well as lower levels of HDL and LDL in the SCARB1 rs10846744 (CC) genotype. In addition, patients with GG genotype had higher fasting blood glucose (FBS) level than those with CC genotype. In conclusion, CD81 and SCARB1 SNPs may serve as powerful predictor factors for treatment responses in CHC patients, and this effect is correlated with serum lipoprotein and FBS levels.
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Affiliation(s)
- Milad Nafari
- Department of Biology, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Shiva Irani
- Department of Biology, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Farzam Vaziri
- Department of Mycobacteriology and Pulmonary Research, Pasteur Institute of Iran, Tehran, Iran; Microbiology Research Center (MRC), Pasteur Institute of Iran, Tehran, Iran
| | - Safoora Gharibzadeh
- Research Centre for Emerging and Reemerging infectious diseases, Pasteur Institute of Iran, Tehran, Iran; Department of Epidemiology and Biostatistics, Pasteur Institute of Iran, Tehran, Iran
| | - Fatemeh Sakhaee
- Department of Mycobacteriology and Pulmonary Research, Pasteur Institute of Iran, Tehran, Iran
| | - Mohammad Khazeni
- Department of Virology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Naser Kalhor
- Stem Cell Laboratory, The Academic Center for Education, Culture and Research (ACECR), Qom Branch, Qom, Iran
| | - Fatemeh Rahimi Jamnani
- Department of Mycobacteriology and Pulmonary Research, Pasteur Institute of Iran, Tehran, Iran; Microbiology Research Center (MRC), Pasteur Institute of Iran, Tehran, Iran
| | - Seyed Davar Siadat
- Department of Mycobacteriology and Pulmonary Research, Pasteur Institute of Iran, Tehran, Iran; Microbiology Research Center (MRC), Pasteur Institute of Iran, Tehran, Iran
| | - Abolfazl Fateh
- Department of Mycobacteriology and Pulmonary Research, Pasteur Institute of Iran, Tehran, Iran; Microbiology Research Center (MRC), Pasteur Institute of Iran, Tehran, Iran.
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Colpitis CC, Baumert TF. SCARB1 variants and HCV infection: Host susceptibility is lost in translation. J Hepatol 2017; 67:211-213. [PMID: 28478119 PMCID: PMC7613423 DOI: 10.1016/j.jhep.2017.04.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Accepted: 04/16/2017] [Indexed: 12/04/2022]
Affiliation(s)
- Che C. Colpitis
- Inserm, U1110, Institut de Recherche sur les Maladies Virales et Hépatiques, 67000 Strasbourg, France,Université de Strasbourg, 67000 Strasbourg, France,Division of Infection and Immunity, University College London, London, UK,Corresponding authors: Prof. Thomas F. Baumert, MD; Inserm U1110, 3 Rue Koeberlé, 67000 Strasbourg, France; phone: ++33 3 68 85 37 03, fax: ++33 3 68 85 37 24, and Dr. Che C. Colpitts; Division of Infection and Immunity, University College London, 90 Gower Street, London, UK WC1E 6BT;
| | - Thomas F. Baumert
- Inserm, U1110, Institut de Recherche sur les Maladies Virales et Hépatiques, 67000 Strasbourg, France,Université de Strasbourg, 67000 Strasbourg, France,Institut Hospitalo-Universitaire, Pôle Hépato-digestif, Hopitaux Universitaires de Strasbourg, 67000 Strasbourg, France,Corresponding authors: Prof. Thomas F. Baumert, MD; Inserm U1110, 3 Rue Koeberlé, 67000 Strasbourg, France; phone: ++33 3 68 85 37 03, fax: ++33 3 68 85 37 24, and Dr. Che C. Colpitts; Division of Infection and Immunity, University College London, 90 Gower Street, London, UK WC1E 6BT;
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Scavenger receptor class B member 1 (SCARB1) variants modulate hepatitis C virus replication cycle and viral load. J Hepatol 2017; 67:237-245. [PMID: 28363797 DOI: 10.1016/j.jhep.2017.03.020] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/29/2016] [Revised: 02/24/2017] [Accepted: 03/14/2017] [Indexed: 12/20/2022]
Abstract
BACKGROUND & AIMS There are numerous coding and non-coding variants in the SCARB1 gene that encodes scavenger receptor class B member 1 (SR-BI), a key receptor for both high density lipoproteins and hepatitis C virus (HCV). Many have been linked to clinical phenotypes, yet their impact on the HCV replication cycle is incompletely understood. The aim of this study was to analyze the impact of these variants on the molecular biology and clinical course of HCV. METHODS We analyzed key coding non-synonymous as well as non-coding SCARB1 variants using virological in vitro and human genetics approaches. RESULTS Non-synonymous variants: S112F and T175A have greatly reduced HCV receptor function. When present on the cell surface, these variants are impaired in their ability to interact with HCV E2. Non-coding variants: The G allele in rs3782287 is associated with decreased viral load. Haplotype analysis confirmed these findings and identified haplotype rs3782287 A/rs5888 C as a risk allele associated with increased viral load. We also detected a trend towards lower hepatic SR-BI expression in individuals with the rs3782287 GG genotype associated with low viral load suggesting a potential underlying mechanism. CONCLUSION Coding and non-coding genetic SCARB1 variants modulate the HCV replication cycle and possibly clinical features of hepatitis C. These findings underscore the relevance of SR-BI as an HCV receptor and contribute to our understanding of inter-individual variation in HCV infection. LAY SUMMARY The cell surface receptor SR-BI (scavenger receptor class B member 1), is essential for hepatitis C virus (HCV) entry into hepatocytes. Variations in the gene coding this receptor influence infectivity and viral load. We analyzed these variations to gain a better understanding of inter-individual differences over the course of HCV infection.
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Gao R, Gao W, Xu G, Xu J, Ren H. Single amino acid mutation of SR-BI decreases infectivity of hepatitis C virus derived from cell culture in a cell culture model. World J Gastroenterol 2017; 23:5158-5166. [PMID: 28811710 PMCID: PMC5537182 DOI: 10.3748/wjg.v23.i28.5158] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Revised: 05/24/2017] [Accepted: 07/04/2017] [Indexed: 02/06/2023] Open
Abstract
AIM To investigate the effect of a single amino acid mutation in human class B scavenger receptor I (SR-BI) on the infectivity of cell culture-derived hepatitis C virus (HCVcc) in SR-BI knock-down Huh7-siSR-BI cells.
METHODS Site-directed mutagenesis was used to construct the SR-BI S112F mutation, and the mutation was confirmed by nucleotide sequencing. SR-BI knock-down Huh7-siSR-BI cells were transfected with SR-BI S112F, SR-BI wild type (WT) and control plasmids, and then infected with HCVpp (HCV pseudoparticles) and hepatitis C virus derived from cell culture (HCVcc). A fluorescence assay was performed to analyze the effect of the S112F mutation on HCV entry; quantitative real-time PCR, immunofluorescence, and Western blot assays were used to analyze the effect of the S112F mutation on HCV infectivity. CHO cells expressing WT and SR-BI S112F were incubated with the HCV E2 protein expressed in HEK 293T cells, and flow cytometry was performed to examine the ability of SR-BI S112F to bind to the HCV E2 protein. Huh7-siSR-BI cells were transfected with SR-BI WT and the S112F mutant, and then DiI-HDL was added and images captured under the microscope to assess the ability of SR-BI S112F to take up HDL.
RESULTS The SR-BI S112F mutation was successfully constructed. The S112F mutation decreased the expression of the SR-BI mRNA and protein. SR-BI S112F decreased HCV entry and HCVcc infectivity in Huh7-siSR-BI cells. The S112F mutation impaired the binding of SR-BI to HCV E2 protein and decreased the HDL uptake of SR-BI.
CONCLUSION The S112F single amino acid mutation in SR-BI decreased the levels of the SR-BI mRNA and protein, as well as the ability of SR-BI to bind to the HCV E2 protein. Amino acid 112 in SR-BI plays important roles in HCV entry and the infectivity of HCVcc in vitro.
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