1
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Sacco M, Testa MF, Ferretti A, Basso M, Lancellotti S, Tardugno M, Di Gennaro L, Concolino P, Minucci A, Spoliti C, Branchini A, De Cristofaro R. An integrated multitool analysis contributes elements to interpreting unclassified factor IX missense variants associated with hemophilia B. J Thromb Haemost 2024; 22:2724-2738. [PMID: 39019441 DOI: 10.1016/j.jtha.2024.07.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2024] [Revised: 06/10/2024] [Accepted: 07/05/2024] [Indexed: 07/19/2024]
Abstract
BACKGROUND Dissection of genotype-phenotype relationships in hemophilia B (HB) is particularly relevant for challenging (mild HB) or for HB-associated but unclassified factor (F)IX missense variants. OBJECTIVE To contribute elements to interpret unclassified HB-associated FIX missense variants by a multiple-level approach upon identification of a reported, but uncharacterized, FIX missense variant associated with mild HB. METHODS Molecular modeling of wild-type and V92A FIX variants, expression studies in HEK293 cells with evaluation of protein (ELISA, western blotting) and activity (activated partial thromboplastin time-based/chromogenic assays) levels after recombinant expression, and multiple prediction tools. RESULTS The F9(NM_000133.4):c.275T>C (p.V92A) variant was found in a mild HB patient (antigen, 45.4 U/dL; coagulant activity, 23.6 IU/dL; specific activity, 0.52). Newly generated molecular models showed alterations in Gla/EGF1-EGF2 domain conformation impacting Ca++ affinity and protein-protein interactions with activated factor XI (FXIa). Multitool analysis indicated a moderate impact on protein structure/function of the valine-to-alanine substitution, in accordance with patient and modeling data. Expression studies on the V92A variant showed a specific activity (0.49 ± 0.07; wild-type, 1.0 ± 0.1) recapitulating that of the natural variant, and pointed toward a moderate activation impairment as the main determinant underlying the p.V92A defect. The validated multitool approach, integrated with evidence-based data, was challenged on a panel (n = 9) of unclassified FIX missense variants, which resulted in inferred protein (secretion/function) outputs and HB severity. CONCLUSION The rational integration of multitool and multiparameter analyses contributed elements to interpret genotype/phenotype relationships of unclassified FIX missense variants, with implications for diagnosis, management, and treatment of HB patients, and potentially translatable into other human disorders.
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Affiliation(s)
- Monica Sacco
- Department of Translational Medicine and Surgery, Catholic University of the Sacred Heart, Rome, Italy
| | - Maria Francesca Testa
- Department of Life Sciences and Biotechnology, University of Ferrara, Ferrara, Italy
| | - Antonietta Ferretti
- Center for Hemorrhagic and Thrombotic Diseases, Foundation University Hospital "A. Gemelli" IRCCS, Rome, Italy
| | - Maria Basso
- Center for Hemorrhagic and Thrombotic Diseases, Foundation University Hospital "A. Gemelli" IRCCS, Rome, Italy
| | - Stefano Lancellotti
- Center for Hemorrhagic and Thrombotic Diseases, Foundation University Hospital "A. Gemelli" IRCCS, Rome, Italy
| | - Maira Tardugno
- Department of Translational Medicine and Surgery, Catholic University of the Sacred Heart, Rome, Italy
| | - Leonardo Di Gennaro
- Center for Hemorrhagic and Thrombotic Diseases, Foundation University Hospital "A. Gemelli" IRCCS, Rome, Italy
| | - Paola Concolino
- Molecular and Genomic Diagnostics Unit, Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Rome, Italy
| | - Angelo Minucci
- Molecular and Genomic Diagnostics Unit, Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Rome, Italy
| | - Claudia Spoliti
- Department of Translational Medicine and Surgery, Catholic University of the Sacred Heart, Rome, Italy
| | - Alessio Branchini
- Department of Life Sciences and Biotechnology, University of Ferrara, Ferrara, Italy.
| | - Raimondo De Cristofaro
- Department of Translational Medicine and Surgery, Catholic University of the Sacred Heart, Rome, Italy; Center for Hemorrhagic and Thrombotic Diseases, Foundation University Hospital "A. Gemelli" IRCCS, Rome, Italy.
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2
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Grigore A, Dragomir M, Călugăru OT, Jardan D, Jardan C, Brînză M, Bălănescu P, Coriu D. Mutational Profile in Romanian Patients with Hemophilia A. Int J Mol Sci 2024; 25:8366. [PMID: 39125936 PMCID: PMC11312815 DOI: 10.3390/ijms25158366] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2024] [Revised: 07/25/2024] [Accepted: 07/30/2024] [Indexed: 08/12/2024] Open
Abstract
Hemophilia A (HA) is an X-linked recessive bleeding disorder caused by mutations in the F8 gene, resulting in deficient or dysfunctional factor VIII (FVIII). This study aimed to characterize the mutational profile of HA in Romanian patients using next-generation sequencing (NGS) and multiplex ligation-dependent probe amplification (MLPA). A total of 107 patients were analyzed, revealing pathogenic or likely pathogenic variants in 96.3% of cases. The identified mutations included missense (30.5%), nonsense (9.1%), small deletions (6.4%), small insertions (2.1%), splice-site variants (4.3%), large deletions (1.6%), and large duplications (1.1%). Large intron inversion was previously found in 37.5% of the patients. Novel variants accounted for 21.5% of identified mutations, expanding the spectrum of F8 variants in this population. This study underscores the genetic heterogeneity of HA and provides insights into genotype-phenotype correlations, aiding in clinical management and prenatal diagnosis.
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Affiliation(s)
- Andra Grigore
- Hematology (Clinic and Laboratory) Discipline-Fundeni Clinical Institute, “Carol Davila” University of Medicine and Pharmacy, 020021 Bucharest, Romania
- Department of Hematology and Bone Marrow Transplant, Fundeni Clinical Institute, 022328 Bucharest, Romania
| | - Mihaela Dragomir
- Department of Hematology and Bone Marrow Transplant, Fundeni Clinical Institute, 022328 Bucharest, Romania
| | - Onda-Tabita Călugăru
- Department of Hematology and Bone Marrow Transplant, Fundeni Clinical Institute, 022328 Bucharest, Romania
| | - Dumitru Jardan
- Molecular Biology Laboratory, Medlife, 010093 Bucharest, Romania
| | - Cerasela Jardan
- Department of Hematology and Bone Marrow Transplant, Fundeni Clinical Institute, 022328 Bucharest, Romania
- Pediatrics Discipline-Fundeni Clinical Institute, “Carol Davila” University of Medicine and Pharmacy, 020021 Bucharest, Romania
| | - Melen Brînză
- Department of Hematology and Bone Marrow Transplant, Fundeni Clinical Institute, 022328 Bucharest, Romania
| | - Paul Bălănescu
- Internal Medicine Discipline-Colentina Clinical Hospital, “Carol Davila” University of Medicine and Pharmacy, 020021 Bucharest, Romania
| | - Daniel Coriu
- Hematology (Clinic and Laboratory) Discipline-Fundeni Clinical Institute, “Carol Davila” University of Medicine and Pharmacy, 020021 Bucharest, Romania
- Department of Hematology and Bone Marrow Transplant, Fundeni Clinical Institute, 022328 Bucharest, Romania
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3
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Li F, He L, Chen G, Lu Y, Li R, Zhang Y, Jing X, Ling R, Li D, Liao C. Variant spectrum of F8 and F9 in hemophilia patients from southern China and 26 novel variants. Front Genet 2023; 14:1254265. [PMID: 38196513 PMCID: PMC10775173 DOI: 10.3389/fgene.2023.1254265] [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: 07/06/2023] [Accepted: 12/11/2023] [Indexed: 01/11/2024] Open
Abstract
Hemophilia, an X-linked recessive disorder, is characterized by spontaneous or trauma-induced prolonged bleeding. It is classified as hemophilia A when caused by variants in the F8 gene, and hemophilia B when caused by F9 variants. Few studies have described hemophilia variants in the Chinese population. This study aimed to investigate the clinical and genetic profiles of 193 hemophilia patients from southern China. Utilizing Sanger sequencing, multiplex ligation-dependent probe amplification, gap detection, long-range PCR, and multiplex PCR, we identified both F8 and F9 gene variants. Pregnant women with a history of hemophilia A offspring underwent amniocentesis or villus sampling for the variant detection. Variants in F8 and F9 were pinpointed in 183 patients, with 26 being novel discoveries. Notably, genetic testing was absent in the initial evaluation of 133 out of 161 patients, leading to a protracted average definitive diagnosis timeline of 2 years. Remarkably, two hemophilia A cases with anticipated severe phenotypes due to protein-truncating variants presented with only moderate or mild clinical manifestations. Among the 40 fetuses tested, 34 were males, with 17 exhibiting hemizygous variants in the F8 gene. Our results contribute to the broader understanding of F8 and F9 variant spectrum and highlight the underuse of genetic analyses in southern China.
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Affiliation(s)
- Fucheng Li
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Liya He
- Hematology Department, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Guilan Chen
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Yan Lu
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Ru Li
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Yongling Zhang
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Xiangyi Jing
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Rujuan Ling
- Department of Internal Medicine, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Dongzhi Li
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Can Liao
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, Guangzhou, Guangdong, China
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4
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Howard T, Almieda M, Diego V, Viel K, Luu B, Haack K, Raja R, Ameri A, Chitlur M, Rydz N, Lillicrap D, Watts R, Kessler C, Ramsey C, Dinh L, Kim B, Powell J, Peralta J, Bouls R, Abraham S, Shen YM, Murillo C, Mead H, Lehmann P, Fine E, Escobar M, Kumar S, Williams-Blangero S, Kasper C, Almasy L, Cole S, Blangero J, Konkle B. A Scan of Pleiotropic Immune Mediated Disease Genes Identifies Novel Determinants of Baseline FVIII Inhibitor Status in Hemophilia-A. RESEARCH SQUARE 2023:rs.3.rs-3371095. [PMID: 37886476 PMCID: PMC10602130 DOI: 10.21203/rs.3.rs-3371095/v1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2023]
Abstract
Hemophilia-A (HA) is caused by heterogeneous loss-of-function factor (F)VIII gene (F8)-mutations and deficiencies in plasma-FVIII-activity that impair intrinsic-pathway-mediated coagulation-amplification. The standard-of-care for severe-HA-patients is regular infusions of therapeutic-FVIII-proteins (tFVIIIs) but ~30% develop neutralizing-tFVIII-antibodies called "FVIII-inhibitors (FEIs)" and become refractory. We used the PATH study and ImmunoChip to scan immune-mediated-disease (IMD)-genes for novel and/or replicated genomic-sequence-variations associated with baseline-FEI-status while accounting for non-independence of data due to genetic-relatedness and F8-mutational-heterogeneity. The baseline-FEI-status of 450 North American PATH subjects-206 with black-African-ancestry and 244 with white-European-ancestry-was the dependent variable. The F8-mutation-data and a genetic-relatedness matrix were incorporated into a binary linear-mixed model of genetic association with baseline-FEI-status. We adopted a gene-centric-association-strategy to scan, as candidates, pleiotropic-IMD-genes implicated in the development of either ³2 autoimmune-/autoinflammatory-disorders (AADs) or ³1 AAD and FEIs. Baseline-FEI-status was significantly associated with SNPs assigned to NOS2A (rs117382854; p=3.2E-6) and B3GNT2 (rs10176009; p=5.1E-6), which have functions in anti-microbial-/-tumoral-immunity. Among IMD-genes implicated in FEI-risk previously, we identified strong associations with CTLA4 assigned SNPs (p=2.2E-5). The F8-mutation-effect underlies ~15% of the total heritability for baseline-FEI-status. Additive genetic heritability and SNPs in IMD-genes account for >50% of the patient-specific variability in baseline-FEI-status. Race is a significant determinant independent of F8-mutation-effects and non-F8-genetics.
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Affiliation(s)
- Tom Howard
- University of Texas Rio Grande Valley School of Medicine
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5
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Efthymiou C, Print EH, Simmons A, Perkins SJ. Analysis of 363 Genetic Variants in F5 via an Interactive Web Database Reveals New Insights into FV Deficiency and FV Leiden. TH OPEN : COMPANION JOURNAL TO THROMBOSIS AND HAEMOSTASIS 2023; 7:e30-e41. [PMID: 36751301 PMCID: PMC9829979 DOI: 10.1055/a-1987-5978] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Accepted: 11/11/2022] [Indexed: 11/27/2022]
Abstract
The inherited bleeding disorder Factor V (FV) deficiency and clotting risk factor FV Leiden are associated with genetic variants in the F5 gene. FV deficiency occurs with mild, moderate, severe, or asymptomatic phenotypes, and either dysfunctional or reduced amounts of plasma FV protein. Here we present an interactive web database containing 363 unique F5 variants derived from 801 patient records, with 199 FV deficiency-associated variants from 245 patient records. Their occurrence is rationalized based on the 2,224 residue sequence and new FV protein structures. The 199 FV deficiency variants correspond to 26 (13%) mild, 22 (11%) moderate, 49 (25%) severe, 35 (18%) asymptomatic, and 67 (34%) unreported phenotypes. Their variant distributions in the FV domains A1, A2, A3, B, C1 and C2 were 28 (14%), 32 (16%), 34 (17%), 42 (21%), 16 (8%), and 19 variants (10%), respectively, showing that these six regions contain similar proportions of variants. Variants associated with FV deficiency do not cluster near known protein-partner binding sites, thus the molecular mechanism leading to the phenotypes cannot be explained. However, the widespread distribution of FV variants in combination with a high proportion of buried variant residues indicated that FV is susceptible to disruption by small perturbations in its globular structure. Variants located in the disordered B domain also appear to disrupt the FV structure. We discuss how the interactive database provides an online resource that clarifies the clinical understanding of FV deficiency.
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Affiliation(s)
- Christos Efthymiou
- Research Department of Structural and Molecular Biology, University College London, London, United Kingdom
| | - Emily H.T. Print
- Research Department of Structural and Molecular Biology, University College London, London, United Kingdom
| | - Anna Simmons
- Research Department of Structural and Molecular Biology, University College London, London, United Kingdom
| | - Stephen J. Perkins
- Research Department of Structural and Molecular Biology, University College London, London, United Kingdom,Address for correspondence Stephen J. Perkins, BA (Oxon), DPhil (Oxon) Department of Structural and Molecular Biology, Darwin Building, University College LondonGower Street, London WC1E 6BTUnited Kingdom
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6
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Testa MF, Lombardi S, Bernardi F, Ferrarese M, Belvini D, Radossi P, Castaman G, Pinotti M, Branchini A. Translational readthrough at F8 nonsense variants in the factor VIII B domain contributes to residual expression and lowers inhibitor association. Haematologica 2022; 108:472-482. [PMID: 35924581 PMCID: PMC9890017 DOI: 10.3324/haematol.2022.281279] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Indexed: 02/03/2023] Open
Abstract
In hemophilia A, F8 nonsense variants, and particularly those affecting the large factor VIII (FVIII) B domain that is dispensable for coagulant activity, display lower association with replacement therapy-related anti-FVIII inhibitory antibodies as retrieved from multiple international databases. Since null genetic conditions favor inhibitor development, we hypothesized that translational readthrough over premature termination codons (PTC) may contribute to immune tolerance by producing full-length proteins through the insertion of amino acid subset(s). To quantitatively evaluate the readthrough output in vitro, we developed a very sensitive luciferase-based system to detect very low full-length FVIII synthesis from a wide panel (n=45; ~60% patients with PTC) of F8 nonsense variants. PTC not associated with inhibitors displayed higher readthrough-driven expression levels than inhibitor-associated PTC, a novel observation. Particularly, higher levels were detected for B-domain variants (n=20) than for variants in other domains (n=25). Studies on plasma from six hemophilia A patients with PTC, integrated by expression of the corresponding nonsense and readthrough-deriving missense variants, consistently revealed higher FVIII levels for B-domain variants. Only one B-domain PTC (Arg814*) was found among the highly represented PTC not sporadically associated with inhibitors, but with the lowest proportion of inhibitor cases (4 out of 57). These original insights into the molecular genetics of hemophilia A, and particularly into genotype-phenotype relationships related with disease treatment, demonstrate that B-domain features favor PTC readthrough output. This provides a potential molecular mechanism contributing to differential PTC-associated inhibitor occurrence, with translational implications for a novel, experimentally based classification of F8 nonsense variants.
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Affiliation(s)
- Maria Francesca Testa
- Department of Life Sciences and Biotechnology and LTTA Center, University of Ferrara, Ferrara
| | - Silvia Lombardi
- Department of Life Sciences and Biotechnology and LTTA Center, University of Ferrara, Ferrara,°Current address: Department of Biotechnology and Biosciences, University of Milano-Bicocca, Milan, Italy
| | - Francesco Bernardi
- Department of Life Sciences and Biotechnology and LTTA Center, University of Ferrara, Ferrara
| | - Mattia Ferrarese
- Department of Life Sciences and Biotechnology and LTTA Center, University of Ferrara, Ferrara
| | - Donata Belvini
- Transfusion Service, Hemophilia Center and Hematology, Castelfranco Veneto Hospital, Castelfranco Veneto
| | - Paolo Radossi
- Oncohematology-Oncologic Institute of Veneto, Castelfranco Veneto Hospital, Castelfranco Veneto
| | - Giancarlo Castaman
- Center for Bleeding Disorders and Coagulation, Careggi University Hospital, Florence, Italy
| | - Mirko Pinotti
- Department of Life Sciences and Biotechnology and LTTA Center, University of Ferrara, Ferrara.
| | - Alessio Branchini
- Department of Life Sciences and Biotechnology and LTTA Center, University of Ferrara, Ferrara.
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7
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Zimta AA, Hotea I, Brinza M, Blag C, Iluta S, Constantinescu C, Bashimov A, Marchis-Hund EA, Coudsy A, Muller-Mohnssen L, Dirzu N, Gulei D, Dima D, Serban M, Coriu D, Tomuleasa C. The Possible Non-Mutational Causes of FVIII Deficiency: Non-Coding RNAs and Acquired Hemophilia A. Front Med (Lausanne) 2021; 8:654197. [PMID: 33968959 PMCID: PMC8099106 DOI: 10.3389/fmed.2021.654197] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2021] [Accepted: 03/11/2021] [Indexed: 12/28/2022] Open
Abstract
Hemophilia type A (HA) is the most common type of blood coagulation disorder. While the vast majority of cases are inherited and caused by mutations in the F8 gene, recent data raises new questions regarding the non-heritability of this disease, as well as how other molecular mechanisms might lead to the development of HA or increase the severity of the disease. Some data suggest that miRNAs may affect the severity of HA, but for some patients, miRNA-based interference might cause HA, in the absence of an F8 mutation. A mechanism in HA installation that is also worth investigating and which could be identified in the future is the epigenetic silencing of the F8 gene that might be only temporarily. Acquired HA is increasingly reported and as more cases are identified, the description of the disease might become challenging, as cases without FVIII autoantibodies might be identified.
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Affiliation(s)
- Alina-Andreea Zimta
- Medfuture Research Center for Advanced Medicine, Iuliu Hatieganu University of Medicine and Pharmacy, Cluj Napoca, Romania
| | - Ionut Hotea
- Department of Hematology, Iuliu Hatieganu University of Medicine and Pharmacy, Cluj Napoca, Romania.,Department of Hematology, Ion Chiricuta Clinical Cancer Center, Cluj Napoca, Romania
| | - Melen Brinza
- Department of Hematology, Fundeni Clinical Institute, Bucharest, Romania.,Department of Hematology, Carol Davila University of Medicine and Pharmacy, Bucharest, Romania
| | - Cristina Blag
- Department of Pediatrics, Iuliu Hatieganu University of Medicine and Pharmacy, Cluj Napoca, Romania.,Department of Hematology, Emergency Clinical Children's Hospital, Cluj Napoca, Romania
| | - Sabina Iluta
- Department of Hematology, Iuliu Hatieganu University of Medicine and Pharmacy, Cluj Napoca, Romania
| | - Catalin Constantinescu
- Department of Hematology, Iuliu Hatieganu University of Medicine and Pharmacy, Cluj Napoca, Romania.,Intensive Care Unit, Clinical Hospital for Infectious Diseases, Cluj Napoca, Romania
| | - Atamyrat Bashimov
- Medfuture Research Center for Advanced Medicine, Iuliu Hatieganu University of Medicine and Pharmacy, Cluj Napoca, Romania
| | - Elisabeth-Antonia Marchis-Hund
- Medfuture Research Center for Advanced Medicine, Iuliu Hatieganu University of Medicine and Pharmacy, Cluj Napoca, Romania
| | - Alexandra Coudsy
- Medfuture Research Center for Advanced Medicine, Iuliu Hatieganu University of Medicine and Pharmacy, Cluj Napoca, Romania
| | - Laetitia Muller-Mohnssen
- Medfuture Research Center for Advanced Medicine, Iuliu Hatieganu University of Medicine and Pharmacy, Cluj Napoca, Romania
| | - Noemi Dirzu
- Medfuture Research Center for Advanced Medicine, Iuliu Hatieganu University of Medicine and Pharmacy, Cluj Napoca, Romania
| | - Diana Gulei
- Medfuture Research Center for Advanced Medicine, Iuliu Hatieganu University of Medicine and Pharmacy, Cluj Napoca, Romania
| | - Delia Dima
- Department of Hematology, Iuliu Hatieganu University of Medicine and Pharmacy, Cluj Napoca, Romania
| | - Margit Serban
- Louis Turcanu Emergency Children's Hospital, Timisoara, Romania.,European Hemophilia Treatment Center, Timisoara, Romania.,Department of Pediatrics, Victor Babes University of Medicine and Pharmacy, Timisoara, Romania
| | - Daniel Coriu
- Department of Hematology, Fundeni Clinical Institute, Bucharest, Romania.,Department of Hematology, Carol Davila University of Medicine and Pharmacy, Bucharest, Romania
| | - Ciprian Tomuleasa
- Medfuture Research Center for Advanced Medicine, Iuliu Hatieganu University of Medicine and Pharmacy, Cluj Napoca, Romania.,Department of Hematology, Iuliu Hatieganu University of Medicine and Pharmacy, Cluj Napoca, Romania.,Department of Hematology, Ion Chiricuta Clinical Cancer Center, Cluj Napoca, Romania
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8
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Feng Y, Li Q, Shi P, Liu N, Kong X, Guo R. Mutation analysis in the F8 gene in 485 families with haemophilia A and prenatal diagnosis in China. Haemophilia 2020; 27:e88-e92. [PMID: 33245802 PMCID: PMC7898705 DOI: 10.1111/hae.14206] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Revised: 10/14/2020] [Accepted: 11/03/2020] [Indexed: 12/25/2022]
Abstract
BACKGROUND Haemophilia A (HA) is an X-linked bleeding disorder caused by mutations in the coagulation factor Ⅷ (F8) gene. Its incidence in men is estimated to be approximately 1/5000. OBJECTIVE This study aimed to characterize the mutation spectrum of the F8 gene in 485 Chinese families, encompassing all HA phenotypic classes. Additionally, we evaluated the accuracy of prenatal diagnosis of foetuses at risk of having HA. METHODS Long-Distance PCR (LD-PCR) and Multiplex PCR were used to detect inversions, next-generation sequencing (NGS) was used for point mutations, and multiplex ligation-dependent probe amplification (MLPA) was used for large deletions or duplications. RESULTS A mutation spectrum of 478 HA families was produced. Throughout 26 exons and 15 introns, a total of 237 different alterations of mutations were detected, of which 146 are known mutations (64.5%) and 91 are novel mutations (35.5%). Prenatal diagnosis revealed 97 normal males (35.79%), 103 HA males (38.01%), 36 normal females (13.28%), and 38 HA carrier females (14.02%). CONCLUSION Using a systematic approach comprised of three steps, 237 pathogenic variants in 478 out of 485 patient samples (98.6%) were detected, including the identification of a heterogeneous mutation spectrum of 91 novel mutations. In addition, prenatal diagnosis of HA in pregnant carriers allowed for accurate determination of the foetal F8 gene state.
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Affiliation(s)
- Yin Feng
- The Department of Obstetrics and Gynecology, The Genetics and Prenatal Diagnosis Center, The First Affiliated Hospital of Zhengzhou University, Henan, China
| | - Qianqian Li
- The Department of Obstetrics and Gynecology, The Genetics and Prenatal Diagnosis Center, The First Affiliated Hospital of Zhengzhou University, Henan, China
| | - Panlai Shi
- The Department of Obstetrics and Gynecology, The Genetics and Prenatal Diagnosis Center, The First Affiliated Hospital of Zhengzhou University, Henan, China
| | - Ning Liu
- The Department of Obstetrics and Gynecology, The Genetics and Prenatal Diagnosis Center, The First Affiliated Hospital of Zhengzhou University, Henan, China
| | - Xiangdong Kong
- The Department of Obstetrics and Gynecology, The Genetics and Prenatal Diagnosis Center, The First Affiliated Hospital of Zhengzhou University, Henan, China
| | - Ruixia Guo
- The Department of Obstetrics and Gynecology, The First Affiliated Hospital of Zhengzhou University, Henan, China
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9
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Jiang N, Xiao Y, Liu Y, Liu W, Liu S. Blood coagulation factor VIII D1241E polymorphism leads to a weak malectin interaction and reduction of factor VIII posttranslational modification and secretion. Exp Cell Res 2020; 397:112334. [PMID: 33144078 DOI: 10.1016/j.yexcr.2020.112334] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2020] [Revised: 10/06/2020] [Accepted: 10/16/2020] [Indexed: 11/18/2022]
Abstract
Blood coagulation factor VIII (FVIII) is a key cofactor in regulation of blood coagulation. This study investigated the mechanism by which FVIII is translated and transported into the endoplasmic reticulum (ER) and processed in the Golgi apparatus before secretion using an in vitro cell model. HEK-293T cells were transfected with vectors carrying wild-type (WT) FVIII or polymorphic FVIII D1241E for coexpression with ER lectins and treatment with tunicamycin (an N-linked glycosylation inhibitor), 1-deoxynojirimycin (an alpha-glucosidase inhibitor), endoglycosidase H, or MG132 (Cbz-Leu-Leu-leucinal; a proteasome inhibitor). The data showed that the minor allele of FVIII D1241E was able to reduce FVIII secretion into the conditioned medium but maintain a normal level of procoagulation ability, although both FVIII WT and the minor allele of FVIII D1241E showed similar levels of transcription and translation capacities. Functionally, the D1241E polymorphism led to a reduced level of FVIII in the Golgi apparatus because of its reduced association with malectin, which interacts with newly synthesized glycoproteins in the ER for FVIII folding and trafficking, leading to degradation of the minor allele of FVIII D1241E in the cytosol. This study demonstrated that malectin is important for regulation of the FVIII posttranslational process and that the minor allele of FVIII D1241E had a reduced association with malectin but an increased capacity for proteasomal FVIII degradation. These data imply the role of the ER quality control in future recombinant FVIII development.
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Affiliation(s)
- Ning Jiang
- Department of Pediatrics, The Second Affiliated Hospital of Xi'an Jiaotong University, China
| | - Yanfeng Xiao
- Department of Pediatrics, The Second Affiliated Hospital of Xi'an Jiaotong University, China.
| | - Yuesheng Liu
- Department of Pediatrics, The Second Affiliated Hospital of Xi'an Jiaotong University, China
| | - Weihua Liu
- Department of Pediatrics, Xi'an first people's Hospital, China
| | - Shanxi Liu
- Shaanxi Yida Haemophilia Institute, China
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10
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Jankowska KI, McGill J, Pezeshkpoor B, Oldenburg J, Sauna ZE, Atreya CD. Further Evidence That MicroRNAs Can Play a Role in Hemophilia A Disease Manifestation: F8 Gene Downregulation by miR-19b-3p and miR-186-5p. Front Cell Dev Biol 2020; 8:669. [PMID: 32850803 PMCID: PMC7406646 DOI: 10.3389/fcell.2020.00669] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Accepted: 07/02/2020] [Indexed: 12/13/2022] Open
Abstract
Hemophilia A (HA) is a F8 gene mutational disorder resulting in deficiency or dysfunctional FVIII protein. However, surprisingly, in few cases, HA is manifested even without mutations in F8. To understand this anomaly, we recently sequenced microRNAs (miRNAs) of two patients with mild and moderate HA with no F8 gene mutations and selected two highly expressing miRNAs, miR-374b-5p and miR-30c-5p, from the pool to explain the FVIII deficiency that could be mediated by miRNA-based F8/FVIII suppression. In this report, an established orthogonal in vivo RNA-affinity purification approach was utilized to directly identify a group of F8-interacting miRNAs and we tested them for F8/FVIII suppression. From this pool, two miRNAs, miR-19b-3p and miR-186-5p, were found to be upregulated in a severe HA patient with a mutation in the F8 coding sequence and two HA patients without mutations in the F8 coding sequence were selected to demonstrate their role in F8 gene expression regulation in mammalian cells. Overall, these results provide further evidence for the hypothesis that by targeting the 3′UTR of F8, miRNAs can modulate FVIII protein levels. This mechanism could either be the primary cause of HA in patients who lack F8 mutations or control the severity of the disease in patients with F8 mutations.
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Affiliation(s)
- Katarzyna I Jankowska
- OBRR/DBCD/LCH in the Center for Biologics Evaluation and Research, U.S. Food and Drug Administration, Silver Spring, MD, United States
| | - Joseph McGill
- OTAT/DPPT/HB in the Center for Biologics Evaluation and Research, U.S. Food and Drug Administration, Silver Spring, MD, United States
| | - Behnaz Pezeshkpoor
- Institute of Experimental Hematology and Transfusion Medicine, University Clinic Bonn, Bonn, Germany.,Center for Rare Diseases Bonn (ZSEB), University Clinic Bonn, Bonn, Germany
| | - Johannes Oldenburg
- Institute of Experimental Hematology and Transfusion Medicine, University Clinic Bonn, Bonn, Germany.,Center for Rare Diseases Bonn (ZSEB), University Clinic Bonn, Bonn, Germany
| | - Zuben E Sauna
- OTAT/DPPT/HB in the Center for Biologics Evaluation and Research, U.S. Food and Drug Administration, Silver Spring, MD, United States
| | - Chintamani D Atreya
- OBRR/DBCD/LCH in the Center for Biologics Evaluation and Research, U.S. Food and Drug Administration, Silver Spring, MD, United States
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11
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Jun Z, Ming-Ming L, Qian-Qing Z, Yun-Hong W, Chong-Yang Z, Xin L. Functional identification of factor VIII B domain regions in hepatocyte cells. Biochem Biophys Res Commun 2020; 526:633-640. [PMID: 32248973 DOI: 10.1016/j.bbrc.2020.03.132] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Accepted: 03/23/2020] [Indexed: 11/15/2022]
Abstract
Factor VIII (FVIII) functions as a cofactor within the intrinsic pathway of blood coagulation in process of FX activation by FIXa, for which deficiency results in the bleeding disorder hemophilia A. The gene of FVIII contains 26 exons that code for a 19 amino acid signal peptide and a 2332 amino acid polypeptide with a domain structure designated A1-A2-B-A3-C1-C2, of which the A domains are homologous with each other, as are the C domains. It has been well-documented that both the domains are the necessary elements for FVIII activities. The B domain is highly glycosylated and has a variable sequence, even among FVIIIs from different species. The B domain plays versatile roles in FVIII lifespan except for coagulation activity, but the functional characteristics of its specific regions remain still obscure. A series of recombinant FVIIIs (rFVIIIs) with B domain truncated were constructed and transiently expressed in hepatocyte cells. Media and cell lysates were collected after 72 h for the analyses of FVIII biosynthesis, secretion, activity and stability in ex vivo plasma relative to the full length wild-type FVIII. Unexpectedly, various regions in B domain exhibited different contribution to these functionalities. The discovery might facilitate the bioengineered rFVIIIs and gene therapeutics.
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Affiliation(s)
- Zhang Jun
- Institute of Molecular Medicine and Oncology, Chongqing Medical University, Chongqing, 400016, China.
| | - Lin Ming-Ming
- Institute of Molecular Medicine and Oncology, Chongqing Medical University, Chongqing, 400016, China
| | - Zhang Qian-Qing
- Institute of Molecular Medicine and Oncology, Chongqing Medical University, Chongqing, 400016, China
| | - Wang Yun-Hong
- Institute of Molecular Medicine and Oncology, Chongqing Medical University, Chongqing, 400016, China
| | - Zhu Chong-Yang
- Institute of Molecular Medicine and Oncology, Chongqing Medical University, Chongqing, 400016, China
| | - Li Xin
- Institute of Molecular Medicine and Oncology, Chongqing Medical University, Chongqing, 400016, China
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12
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Fodil M, Zemani F. In Silico Study of Correlation between Missense Variations of F8 Gene and Inhibitor Formation in Severe Hemophilia A. Turk J Haematol 2020; 37:77-83. [PMID: 31876401 PMCID: PMC7236410 DOI: 10.4274/tjh.galenos.2019.2019.0094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022] Open
Abstract
Objective: Deleterious substitutions of the F8 gene are responsible for causing hemophilia A, which is an inherited bleeding disorder resulting from reduced or absent activity of the coagulant protein factor VIII (FVIII). The most important complication in treatment is inhibitor development toward therapeutic factor VIII. In this study, we aimed to analyze the effects of deleterious substitutions in the F8 gene upon protein structure and function. Materials and Methods: All tests were conducted by computational methods from the CHAMP (CDC Hemophilia A Mutation Project) database. We performed an in silico analysis of deleterious variations using five software programs, Sift, PolyPhen-2, Align-GVGD, KD4v, and MutationTaster, in order to analyze the correlation between variation and the disease. We also studied the correlation between these variations and inhibitor formation. Results: Our analysis showed that these in silico tools are coherent and that there are more variations in the A than the C domains. Moreover, we noticed that there are more deleterious variations than neutral variations in each of the A and C domains. We also found that 13.51% of the patients suffered from a severe form of hemophilia A and that carriers of missense variations developed inhibitors. Also, for the first time, we determined that variation nature is not associated with inhibitor formation. Furthermore, this analysis showed that the risk of developing inhibitors increases when the variation causes a change of amino acid class. Conclusion: This study will help to correctly associate variations with inhibitor development and aid in early characterization of novel variants.
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Affiliation(s)
- Mostefa Fodil
- Higher School of Biological Sciences of Oran (ESSBO), Oran, Algeria
| | - Faouzia Zemani
- Molecular and Cellular Genetics Laboratory, Oran University of Science and Technology - Mohamed Boudiaf (USTOMB), Oran, Algeria
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13
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Jankowska KI, McGill J, Pezeshkpoor B, Oldenburg J, Atreya CD, Sauna ZE. Clinical manifestation of hemophilia A in the absence of mutations in the F8 gene that encodes FVIII: role of microRNAs. Transfusion 2019; 60:401-413. [PMID: 31785023 DOI: 10.1111/trf.15605] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Revised: 10/07/2019] [Accepted: 10/08/2019] [Indexed: 12/15/2022]
Abstract
BACKGROUND Hemophilia A (HA) is associated with mutations in the F8 gene that expresses factor VIII (FVIII). Unexpectedly, HA also manifests in a small subset of individuals with no mutations (exonic or intronic) in their F8 gene. MicroRNAs (miRNAs) cause translational interference, affecting protein quality and stoichiometry. Here, by analyzing miRNAs of two patients from this subset, we evaluated miRNA-based FVIII suppression as a testable hypothesis to explain FVIII deficiency in patients with HA with no F8 gene mutations. STUDY DESIGN AND METHODS To test the hypothesis, miRNA sequencing from two patients with mild and moderate HA with no mutations in their F8 gene, followed by experimental verification, was used to identify a group of upregulated miRNAs in patients with HA compared to normal controls; with binding sites in the 3' untranslated region (UTR) of F8 messenger RNA (mRNA), a prerequisite for miRNA-based gene regulation. From this pool, miR-374b-5p and miR-30c-5p, known to be expressed in human liver, where FVIII is expressed, were subjected to extensive characterization. RESULTS In two cell lines that constitutively express FVIII, we demonstrated that overexpression of miR-374b or miR-30c decreased FVIII expression, while an miR-30c inhibitor partially restored FVIII expression. CONCLUSION These data support a role for microRNAs in fine-tuning F8 gene regulation. Based on our findings, our current model suggests that in HA cases where the F8 gene is normal and is predicted to express normal levels of FVIII, F8 mRNA 3' UTR targeting miRNAs may be responsible for a FVIII-deficiency phenotype clinically manifesting as HA.
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Affiliation(s)
| | - Joseph McGill
- OTAT/DPPT/HB in the Center for Biologics Evaluation and Research, US Food and Drug Administration, Silver Spring, Maryland
| | - Behnaz Pezeshkpoor
- Institute of Experimental Hematology and Transfusion Medicine, University Clinic Bonn, Bonn, Germany.,Center for Rare Diseases Bonn (ZSEB), University Clinic Bonn, Bonn, Germany
| | - Johannes Oldenburg
- Institute of Experimental Hematology and Transfusion Medicine, University Clinic Bonn, Bonn, Germany.,Center for Rare Diseases Bonn (ZSEB), University Clinic Bonn, Bonn, Germany
| | | | - Zuben E Sauna
- OTAT/DPPT/HB in the Center for Biologics Evaluation and Research, US Food and Drug Administration, Silver Spring, Maryland
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14
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Mutational Profiles of F8 and F9 in a Cohort of Haemophilia A and Haemophilia B Patients in the Multi-ethnic Malaysian Population. Mediterr J Hematol Infect Dis 2018; 10:e2018056. [PMID: 30210749 PMCID: PMC6131101 DOI: 10.4084/mjhid.2018.056] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2018] [Accepted: 08/10/2018] [Indexed: 12/30/2022] Open
Abstract
Background Haemophilia A (HA) and Haemophilia B (HB) are X-linked blood disorders that are caused by various mutations in the factor VIII (F8) and factor IX (F9) genes respectively. Identification of mutations is essential as some of the mutations are associated with the development of inhibitors. This study is the first comprehensive study of the F8 mutational profile in Malaysia. Materials and methods We analysed 100 unrelated HA and 15 unrelated HB patients for genetic alterations in the F8 and F9 genes by using the long-range PCR, DNA sequencing, and the multiplex-ligation-dependent probe amplification assays. The prediction software was used to confirm the effects of these mutations on factor VIII and IX proteins. Results 44 (53%) of the severe HA patients were positive for F8 intron 22 inversion, and three (3.6%) were positive for intron one inversion. There were 22 novel mutations in F8, including missense (8), frameshift (9), splice site (3), large deletion (1) and nonsense (1) mutations. In HB patients, four novel mutations were identified including the splice site (1), small deletion (1), large deletion (1) and missense (1) mutation. Discussion The mutational spectrum of F8 in Malaysian patients is heterogeneous, with a slightly higher frequency of intron 22 inversion in these severe HA patients when compared to other Asian populations. Identification of these mutational profiles in F8 and F9 genes among Malaysian patients will provide a useful reference for the early detection and diagnosis of HA and HB in the Malaysian population.
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15
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Ferrarese M, Testa MF, Balestra D, Bernardi F, Pinotti M, Branchini A. Secretion of wild-type factor IX upon readthrough over F9 pre-peptide nonsense mutations causing hemophilia B. Hum Mutat 2018; 39:702-708. [PMID: 29388273 DOI: 10.1002/humu.23404] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2017] [Revised: 01/16/2018] [Accepted: 01/19/2018] [Indexed: 12/30/2022]
Abstract
Pre-peptide regions of secreted proteins display wide sequence variability, even among highly homologous proteins such as coagulation factors, and are intracellularly removed, thus potentially favoring secretion of wild-type proteins upon suppression of nonsense mutations (translational readthrough). As models we selected F9 nonsense mutations with readthrough-favorable features affecting the pre-peptide and pro-peptide regions of coagulation factor IX (FIX), which cause hemophilia B (HB). Only the p.Gly21Ter (c.61G > T) in the variable pre-peptide hydrophobic core significantly responded (secretion, 4.1 ± 0.5% of wild-type; coagulant activity, 4.0 ± 0.3%) to the readthrough-inducer geneticin. Strikingly, for the p.Gly21Ter mutation, the resulting specific coagulant activity (0.96 ± 0.11) was compatible with normal function, thus suggesting secretion of FIX with wild-type features upon readthrough and removal of pre-peptide. Expression of the predicted readthrough-deriving missense variants (Gly21Trp/Cys/Arg) revealed a preserved specific activity (ranging from 0.84 to 0.98), thus supporting our observation. Conversely, rescue of the p.Cys28Ter (c.84T > A) and p.Lys45Ter (c.133A > T) was prevented by constraints of adjacent cleavage sites, a finding consistent with the association of most missense mutations affecting these regions with severe or moderate HB. Overall, our data indicate that suppression of nonsense mutations in the pre-peptide core preserves mature protein features, thus making this class of mutations preferred candidates for therapeutic readthrough.
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Affiliation(s)
- Mattia Ferrarese
- Department of Life Sciences and Biotechnology, University of Ferrara, Ferrara, Italy
| | - Maria Francesca Testa
- Department of Life Sciences and Biotechnology, University of Ferrara, Ferrara, Italy
| | - Dario Balestra
- Department of Life Sciences and Biotechnology, University of Ferrara, Ferrara, Italy
| | - Francesco Bernardi
- Department of Life Sciences and Biotechnology, University of Ferrara, Ferrara, Italy
| | - Mirko Pinotti
- Department of Life Sciences and Biotechnology, University of Ferrara, Ferrara, Italy
| | - Alessio Branchini
- Department of Life Sciences and Biotechnology, University of Ferrara, Ferrara, Italy
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16
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Hubner EK, Lechler C, Rösner TN, Kohnke-Ertel B, Schmid RM, Ehmer U. Constitutive and Inducible Systems for Genetic In Vivo Modification of Mouse Hepatocytes Using Hydrodynamic Tail Vein Injection. J Vis Exp 2018. [PMID: 29443066 DOI: 10.3791/56613] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
In research models of liver cancer, regeneration, inflammation, and fibrosis, flexible systems for in vivo gene expression and silencing are highly useful. Hydrodynamic tail vein injection of transposon-based constructs is an efficient method for genetic manipulation of hepatocytes in adult mice. In addition to constitutive transgene expression, this system can be used for more advanced applications, such as shRNA-mediated gene knock-down, implication of the CRISPR/Cas9 system to induce gene mutations, or inducible systems. Here, the combination of constitutive CreER expression together with inducible expression of a transgene or miR-shRNA of choice is presented as an example of this technique. We cover the multi-step procedure starting from the preparation of sleeping beauty-transposon constructs, to the injection and treatment of mice, and the preparation of liver tissue for analysis by immunostaining. The system presented is a reliable and efficient approach to achieve complex genetic manipulations in hepatocytes. It is specifically useful in combination with Cre/loxP-based mouse strains and can be applied to a variety of models in the research of liver disease.
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Affiliation(s)
- Eric K Hubner
- Department of Medicine II, Klinikum rechts der Isar, Technische Universität München; Department of Pneumology, Center for Medicine, Medical Center University of Freiburg
| | - Christian Lechler
- Department of Medicine II, Klinikum rechts der Isar, Technische Universität München
| | - Thomas N Rösner
- Department of Medicine II, Klinikum rechts der Isar, Technische Universität München
| | - Birgit Kohnke-Ertel
- Department of Medicine II, Klinikum rechts der Isar, Technische Universität München
| | - Roland M Schmid
- Department of Medicine II, Klinikum rechts der Isar, Technische Universität München
| | - Ursula Ehmer
- Department of Medicine II, Klinikum rechts der Isar, Technische Universität München;
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17
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Pahl S, Pavlova A, Driesen J, Oldenburg J. Effect of F8 B domain gene variants on synthesis, secretion, activity and stability of factor VIII protein. Thromb Haemost 2017; 111:58-66. [DOI: 10.1160/th13-01-0028] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2013] [Accepted: 09/02/2013] [Indexed: 12/31/2022]
Abstract
SummaryThe B domain of the coagulation factor (F)VIII comprises some unique characteristics. Though the B domain is important for processing, intracellular transport and secretion of FVIII protein, its role in the coagulation still remains unclear. This study aims to investigate the influence of 19 reported B domain variants on quantity and quality of expressed FVIII protein. F8 variants were transiently expressed in HEK293T cells. Media and cell lysates were collected after 72 hours. FVIII synthesis, relative secretion, activity and thermostability were analysed in comparison to FVIII wild-type. Eleven of 19 analysed B domain variants showed normal FVIII activity (FVIII:C), and antigen values (40–150 %). Eight variants exhibited a decreased FVIII:C, corresponding to a mild phenotype most likely due to impaired expression and secretion mechanism, reduced thermostability or combined mechanisms. One variant, p.His1066Tyr, showed markedly reduced FVIII antigen in cell lysate. The variants p.Asp845Glu, p.His998Gln, and p.Ala1610Ser revealed a significantly decreased relative secretion. Additionally, six B domain variants significantly reduced stability of FVIII. In conclusion, none of the analysed missense mutations was causative for a severe haemophilia A (HA) phenotype. Nevertheless, the mutations p.Asp845Glu, p.Pro947Arg, p.Glu1057Lys, p.His1066Tyr, p.Arg1126Trp, p.Arg1329His, p.Leu1481Pro, and p.Ala1610Ser resulted in decreased FVIII:C values that may explain mild HA phenotypes.
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18
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Pavlova A, Albert T, Caspers M, Oldenburg J, Schwaab R. Significance of F8 missense mutations with respect to inhibitor formation. Thromb Haemost 2017; 109:464-70. [PMID: 23306409 DOI: 10.1160/th12-07-0521] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2012] [Accepted: 11/22/2012] [Indexed: 11/05/2022]
Abstract
SummaryWe have identified 1,135 haemophilia A patients with missense mutations associated with mild (46%), moderate (22%), severe (16%), and mixed haemophilia phenotypes (11%). Altogether, we detected 374 different missense mutations of which 195 are not listed in the HAMSTeRS database. While missense mutations are strongly underrepresented within the factor VIII (FVIII) B-domain, they are evenly distributed throughout the entire F8 cDNA sequence. Only 36 (5%) of 720 patients with missense mutations and known inhibitor status showed an association with inhibitor formation. Inhibitor prevalence was four-fold higher for severe haemophilia compared to mild/moderate phenotypes. Mutations associated with inhibitor formation were especially clustered within the C1/C2 domain compared to the other domains (8.7% C1/C2 domain vs. 3.6% non-C1/C2-domain; p-value: 0.01). Three different missense mutations (T314A [T295A], S2010P [S1991P], R2169H [R2150H]) were associated twice with inhibitor formation. Importantly, we found that the risk of inhibitor formation in association with FVIII missense mutations is significant higher if the amino acid substitution belongs to another physicochemical class than the original residue (p-value 0.039). For this purpose distinct classes of substitutions were grouped in association with side chains properties: class I, small/hydrophobic; class II, neutral; class III, acidic; class IV, basic. Thus, although missense mutations were associated with an overall lower risk of inhibitor formation compared to other F8 gene mutation types, different missense mutations correlate with specific risks for inhibitor formation. These differences have to be identified in assigning risk profiles to aid in choice of preventative treatments designed to prevent inhibitor formation.
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19
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Novel Mutations Resulting in a Moderate to Severe Phenotypic Manifestation of Hemophilia A in a Female. J Pediatr Hematol Oncol 2017; 39:e403-e405. [PMID: 28452855 DOI: 10.1097/mph.0000000000000832] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Hemophilia A is an X-linked, recessive disorder resulting from mutations in the f8 gene. Here we report the rare case of a female compound heterozygote with mild factor VIII deficiency (fVIII:C 9%) and moderate phenotype. On investigation she was confirmed to have normal Von Willebrand factor studies with a 46XY genotype. Further genetic testing revealed 3 mutations in the f8 gene: 1 novel missense mutation (c.6142T>G), 1 novel in-frame deletion (c.1281_1292del), and another missense mutation of unclear significance (c.3780C>G). Both parents had normal coagulation profiles; however, the 2 novel mutations were present in the patient's mother and the known missense mutation was present in her father. This unusual case demonstrates the utility in genetic analysis for f8 gene mutational analysis and suggests a compound effect of the 3 identified mutations as a cause for factor deficiency.
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20
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Li DL, Li BL, Zhao ZD, Cao W. [Analysis of factor Ⅷ gene mutations in a family with hemophilia A]. ZHONGHUA XUE YE XUE ZA ZHI = ZHONGHUA XUEYEXUE ZAZHI 2016; 37:705-7. [PMID: 27587255 PMCID: PMC7348529 DOI: 10.3760/cma.j.issn.0253-2727.2016.08.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/21/2016] [Indexed: 11/05/2022]
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Jourdy Y, Nougier C, Roualdes O, Fretigny M, Durand B, Negrier C, Vinciguerra C. Characterization of five associations ofF8missense mutations containing FVIII B domain mutations. Haemophilia 2016; 22:583-9. [DOI: 10.1111/hae.12906] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/30/2015] [Indexed: 01/17/2023]
Affiliation(s)
- Y. Jourdy
- Hospices Civils de Lyon; Hôpital Edouard Herriot; Service d'hématologie Biologique; Lyon France
- EAM 4174 Hémostase; Inflammation et Sepsis; Université Claude Bernard Lyon1; Université de Lyon; Lyon France
| | - C. Nougier
- Hospices Civils de Lyon; Hôpital Edouard Herriot; Service d'hématologie Biologique; Lyon France
- EAM 4174 Hémostase; Inflammation et Sepsis; Université Claude Bernard Lyon1; Université de Lyon; Lyon France
| | - O. Roualdes
- Hospices Civils de Lyon; Hôpital Edouard Herriot; Service d'hématologie Biologique; Lyon France
- EAM 4174 Hémostase; Inflammation et Sepsis; Université Claude Bernard Lyon1; Université de Lyon; Lyon France
| | - M. Fretigny
- Hospices Civils de Lyon; Hôpital Edouard Herriot; Service d'hématologie Biologique; Lyon France
| | - B. Durand
- Hospices Civils de Lyon; Hôpital de la Croix Rousse; Service d'hématologie Biologique; Lyon France
| | - C. Negrier
- Hospices Civils de Lyon; Hôpital Edouard Herriot; Service d'hématologie Biologique; Lyon France
- EAM 4174 Hémostase; Inflammation et Sepsis; Université Claude Bernard Lyon1; Université de Lyon; Lyon France
| | - C. Vinciguerra
- Hospices Civils de Lyon; Hôpital Edouard Herriot; Service d'hématologie Biologique; Lyon France
- EAM 4174 Hémostase; Inflammation et Sepsis; Université Claude Bernard Lyon1; Université de Lyon; Lyon France
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22
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Nougier C, Roualdes O, Fretigny M, d'Oiron R, Costa C, Negrier C, Vinciguerra C. Characterization of four novel molecular changes in the promoter region of the factor VIII gene. Haemophilia 2013; 20:e149-56. [DOI: 10.1111/hae.12346] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/17/2013] [Indexed: 01/10/2023]
Affiliation(s)
- C. Nougier
- Service d'Hématologie Biologique; HCL, Hôpital Edouard Herriot; Lyon France
- EAM 4174 Hémostase, Inflammation et Sepsis; Université Claude Bernard Lyon 1; Lyon France
| | - O. Roualdes
- Service d'Hématologie Biologique; HCL, Hôpital Edouard Herriot; Lyon France
- EAM 4174 Hémostase, Inflammation et Sepsis; Université Claude Bernard Lyon 1; Lyon France
| | - M. Fretigny
- Service d'Hématologie Biologique; HCL, Hôpital Edouard Herriot; Lyon France
| | - R. d'Oiron
- Centre de Traitement pour Hémophiles, AP-HP Hôpital Bicêtre; Université Paris XI; le Kremlin-Bicêtre France
| | - C. Costa
- Département de Génétique; CHU Henri Mondor-AP-HP; Créteil France
| | - C. Negrier
- Service d'Hématologie Biologique; HCL, Hôpital Edouard Herriot; Lyon France
- EAM 4174 Hémostase, Inflammation et Sepsis; Université Claude Bernard Lyon 1; Lyon France
| | - C. Vinciguerra
- Service d'Hématologie Biologique; HCL, Hôpital Edouard Herriot; Lyon France
- EAM 4174 Hémostase, Inflammation et Sepsis; Université Claude Bernard Lyon 1; Lyon France
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23
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Abdi M, Zemani-Fodil F, Fodil M, Aberkane MS, Touhami H, Saidi-Mehtar N, Costa C, Boudjema A. First molecular analysis of F8 gene in algeria: identification of two novel mutations. Clin Appl Thromb Hemost 2013; 20:741-8. [PMID: 24270469 DOI: 10.1177/1076029613513321] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
The aim of this study was to detect the genetic alterations in the Factor 8 gene in 26 patients from Western Algeria. We detected the presence of "intron 22 inversion" with long-range polymerase chain reaction (PCR). Negative patients for this inversion were analyzed for "intron 1 inversion" using multiplex PCR. Patients who were negative for both inversions were analyzed using a direct sequencing. Deleterious effects of novel mutations on protein were assayed with bioinformatics tools. Causing mutations were identified in 85.71% of the families, including 11 "intron 22 inversion," 1 "intron 1 inversion," and 6 different point mutations (2 nonsense, 1 splice site, and 3 missense mutations). Among these mutations, c.2189G > A (p.Cys711Tyr) and c.5219+1G>T are novel. This is the first study that reports spectrum of mutations in the Factor 8 gene in the Western Algerian population. Knowledge of these mutations is important for genetic counseling and medical care of affected families.
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Affiliation(s)
- Meriem Abdi
- Laboratoire de Génétique Moléculaire et Cellulaire, Université des Sciences et de la Technologie d'Oran Mohamed Boudiaf, Oran, Algeria
| | - Faouzia Zemani-Fodil
- Laboratoire de Génétique Moléculaire et Cellulaire, Université des Sciences et de la Technologie d'Oran Mohamed Boudiaf, Oran, Algeria
| | - Mostefa Fodil
- Laboratoire de Génétique Moléculaire et Cellulaire, Université des Sciences et de la Technologie d'Oran Mohamed Boudiaf, Oran, Algeria
| | - Meriem Samia Aberkane
- Laboratoire de Génétique Moléculaire et Cellulaire, Université des Sciences et de la Technologie d'Oran Mohamed Boudiaf, Oran, Algeria
| | - Hadj Touhami
- Service d'hématologie, Centre Hospitalo-universitaire d'Oran, Boulevard Docteur Benzerdjeb, Plateau, Oran, Algeria
| | - Nadhira Saidi-Mehtar
- Laboratoire de Génétique Moléculaire et Cellulaire, Université des Sciences et de la Technologie d'Oran Mohamed Boudiaf, Oran, Algeria
| | - Catherine Costa
- Laboratoire de Génétique Moléculaire, Service de biochimie, Hôpital Henri Mondor, Creteil, France
| | - Abdallah Boudjema
- Laboratoire de Génétique Moléculaire et Cellulaire, Université des Sciences et de la Technologie d'Oran Mohamed Boudiaf, Oran, Algeria
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Minimal modification in the factor VIII B-domain sequence ameliorates the murine hemophilia A phenotype. Blood 2013; 121:4396-403. [PMID: 23372167 DOI: 10.1182/blood-2012-10-464164] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
Recombinant canine B-domain deleted (BDD) factor VIII (FVIII) is predominantly expressed as a single-chain protein and exhibits greater stability after activation compared with human FVIII-BDD. We generated a novel BDD-FVIII variant (FVIII-RH) with an amino acid change at the furin cleavage site within the B domain (position R1645H) that mimics the canine sequence (HHQR vs human RHQR). Compared with human FVIII-BDD, expression of FVIII-RH protein revealed a 2.5-fold increase in the single-chain form. Notably, FVIII-RH exhibited a twofold increase in biological activity compared with FVIII-BDD, likely due to its slower dissociation of the A2-domain upon thrombin activation. Injection of FVIII-RH protein in hemophilia A (HA) mice resulted in more efficacious hemostasis following vascular injury in both the macro- and microcirculation. These findings were successfully translated to adeno-associated viral (AAV)-based liver gene transfer in HA mice. Expression of circulating FVIII-RH was approximately twofold higher compared with AAV-FVIII-BDD-injected mice. Moreover, FVIII-RH exhibits superior procoagulant effects compared with FVIII-BDD following a series of hemostatic challenges. Notably, the immunogenicity of FVIII-RH did not differ from FVIII-BDD. Thus, FVIII-RH is an attractive bioengineered molecule for improving efficacy without increased immunogenicity and may be suitable for both protein- and gene-based strategies for HA.
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Payne AB, Miller CH, Kelly FM, Michael Soucie J, Craig Hooper W. The CDC Hemophilia A Mutation Project (CHAMP) mutation list: a new online resource. Hum Mutat 2012; 34:E2382-91. [PMID: 23280990 DOI: 10.1002/humu.22247] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2012] [Accepted: 10/22/2012] [Indexed: 01/15/2023]
Abstract
Genotyping efforts in hemophilia A (HA) populations in many countries have identified large numbers of unique mutations in the Factor VIII gene (F8). To assist HA researchers conducting genotyping analyses, we have developed a listing of F8 mutations including those listed in existing locus-specific databases as well as those identified in patient populations and reported in the literature. Each mutation was reviewed and uniquely identified using Human Genome Variation Society (HGVS) nomenclature standards for coding DNA and predicted protein changes as well as traditional nomenclature based on the mature, processed protein. Listings also include the associated hemophilia severity classified by International Society of Thrombosis and Haemostasis (ISTH) criteria, associations of the mutations with inhibitors, and reference information. The mutation list currently contains 2,537 unique mutations known to cause HA. HA severity caused by the mutation is available for 2,022 mutations (80%) and information on inhibitors is available for 1,816 mutations (72%). The CDC Hemophilia A Mutation Project (CHAMP) Mutation List is available at http://www.cdc.gov/hemophiliamutations for download and search and will be updated quarterly based on periodic literature reviews and submitted reports.
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Affiliation(s)
- Amanda B Payne
- Division of Blood Disorders, National Center on Birth Defects and Developmental Disabilities, Centers for Disease Control and Prevention, Atlanta, Georgia 30333, USA
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RAVANBOD S, RASSOULZADEGAN M, RASTEGAR-LARI G, JAZEBI M, ENAYAT S, ALA F. Identification of 123 previously unreported mutations in the F8 gene of Iranian patients with Haemophilia A. Haemophilia 2011; 18:e340-6. [DOI: 10.1111/j.1365-2516.2011.02708.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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