1
|
Li S, Shu K, Li F, Yang X, Yang W, Ye M, Wang X, Jiang M. Phenotypic and genetic analyses of four cases of coagulation factor XII deficiency. HEMATOLOGY (AMSTERDAM, NETHERLANDS) 2022; 27:802-808. [PMID: 35866546 DOI: 10.1080/16078454.2022.2083482] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
OBJECTIVES To identify the clinical phenotypic and molecular pathogeneses of four cases of coagulation factor XII deficiency and to deepen the cognition of this disease. METHODS Coagulation tests were performed through one stage of coagulation on a STAGO coagulation analyser. Coagulation factor XII antigen was detected using enzyme-linked immunosorbent assay. The species conservatism and structural change of mutant proteins were analysed using MegAlign and PYMOL. Meanwhile, missense variants and a novel splice site variant were identified using PolyPhen2 and NetGene2. RESULTS The four cases had an observably prolonged activated partial thromboplastin time but without obvious bleeding tendency. Their coagulation factor XII activity (FⅫ:C) and antigen (FXII:Ag) were greatly reduced. Six mutations were detected: NM_000505.4:c.398-1G>A, NP_000496.2:p.(Pro182Leu), NP_000496.2:p.(Ser479Ter), NP_000496.2:p.(Cys559Arg), NC_000005.10:g.7217_7221delinsGTCTA and NM_000505.4:c.1681-1G>A. The first five are newly discovered mutations. The two missense mutation sites were highly conservative, and their protein secondary structure changes may occur not only on the mutation sites but also on other domains. In silico analysis revealed that NP_000496.2:p.(Pro182Leu) may be BENIGN, NP_000496.2:p.(Cys559Arg) may be damaging, and that NM_000505.4:c.398-1G>A and NM_000505.4:c.1681-1G>A are crucial for splicing. CONCLUSION We found six types of mutations, of which five were novel. The two missense mutation sites might be closely related to the function of coagulation factor XII. The mutations were the primary culprits of factor XII deficiency.
Collapse
Affiliation(s)
- Shanshan Li
- Department of Laboratory Medicine, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou, People's Republic of China
| | - Kuangyi Shu
- Department of Laboratory Medicine, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou, People's Republic of China
| | - Fanfan Li
- Department of Laboratory Medicine, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou, People's Republic of China
| | - Xiao Yang
- Department of Laboratory Medicine, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou, People's Republic of China
| | - Wei Yang
- Department of Laboratory Medicine, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou, People's Republic of China
| | - Manli Ye
- Department of Laboratory Medicine, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou, People's Republic of China
| | - Xiaoou Wang
- Department of Laboratory Medicine, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou, People's Republic of China
| | - Minghua Jiang
- Department of Laboratory Medicine, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou, People's Republic of China
| |
Collapse
|
2
|
Konrath S, Mailer RK, Renné T. Mechanism, Functions, and Diagnostic Relevance of FXII Activation by Foreign Surfaces. Hamostaseologie 2021; 41:489-501. [PMID: 34592776 DOI: 10.1055/a-1528-0499] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
Abstract
Factor XII (FXII) is a serine protease zymogen produced by hepatocytes and secreted into plasma. The highly glycosylated coagulation protein consists of six domains and a proline-rich region that regulate activation and function. Activation of FXII results from a conformational change induced by binding ("contact") with negatively charged surfaces. The activated serine protease FXIIa drives both the proinflammatory kallikrein-kinin pathway and the procoagulant intrinsic coagulation cascade, respectively. Deficiency in FXII is associated with a prolonged activated partial thromboplastin time (aPTT) but not with an increased bleeding tendency. However, genetic or pharmacological deficiency impairs both arterial and venous thrombosis in experimental models. This review summarizes current knowledge of FXII structure, mechanisms of FXII contact activation, and the importance of FXII for diagnostic coagulation testing and thrombosis.
Collapse
Affiliation(s)
- Sandra Konrath
- Institute of Clinical Chemistry and Laboratory Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Reiner K Mailer
- Institute of Clinical Chemistry and Laboratory Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Thomas Renné
- Institute of Clinical Chemistry and Laboratory Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| |
Collapse
|
3
|
Liu M, Wang H, Lin M, Jin Y, Yang L, Wang M. A novel homozygous missense mutation (Met527Ile) in a consanguineous marriage family with inherited factor XII deficiency. Hematology 2020; 25:502-506. [PMID: 33317433 DOI: 10.1080/16078454.2020.1859249] [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] [Indexed: 10/22/2022] Open
Abstract
OBJECTIVE To identify potential mutations of the FXII gene (F12) in a consanguineous marriage family with hereditary coagulation factor XII (FXII) deficiency, and it will improve the understanding of the pathogenesis involved in the disease. CLINICAL PRESENTATION The proband was a 58-year-old male who had chronic gastritis. He was found to have a significantly prolonged activated partial thromboplastin time (APTT) at 101.0s (reference range, 29.0-43.0 s) before stomachendoscopy. TECHNIQUES The coagulation factor XII activity (FXII:C) and FXII antigen (FXII:Ag) were measured by one-stage clotting assay and enzyme-linked immunosorbent assay, respectively. The F12 gene was amplified by polymerase chain reaction and sequenced. Mutation sites were further confirmed by reverse sequencing. The conservatism and possible impact of the amino acid substitution were analyzed by multiple bioinformatics tools, as well as 3D protein model analysis. RESULTS The proband had a prolonged APTT (101.0 s), whose FXII:C and FXII:Ag were obviously reduced, both at 1.0% (normal range, 72-113%). Gene sequencing revealed that he carried a homozygous missense mutation of Met527Ile. Family study showed that his mother, son and daughter carried a heterozygous Met527Ile. Bioinformatics and model analysis of the mutation indicated that Met527Ile may be detrimental and potentially alters the structure and the function of the protein. CONCLUSION The novel mutation Met527Ile could potentially account for the reduced activity of FXII in this family.
Collapse
Affiliation(s)
- Meina Liu
- Department of Clinical Laboratory, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, People's Republic of China
| | - Huanhuan Wang
- Department of Clinical Laboratory, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, People's Republic of China
| | - Miaomiao Lin
- Department of Clinical Laboratory, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, People's Republic of China
| | - Yanhui Jin
- Department of Clinical Laboratory, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, People's Republic of China
| | - Lihong Yang
- Department of Clinical Laboratory, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, People's Republic of China
| | - Mingshan Wang
- Department of Clinical Laboratory, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, People's Republic of China
| |
Collapse
|
4
|
Genetic analysis of a novel missense mutation (Gly542Ser) with factor XII deficiency in a Chinese patient of consanguineous marriage. Int J Hematol 2018; 107:436-441. [PMID: 29383625 DOI: 10.1007/s12185-017-2393-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2017] [Revised: 12/14/2017] [Accepted: 12/18/2017] [Indexed: 10/18/2022]
Abstract
Coagulation factor XII deficiency is a rare autosomal recessive disorder, which could be found in a consanguineous family. We studied a Chinese family in which the activated partial thromboplastin time (APTT) of the proband had clearly prolonged up to 101.7 s, associated with low FXII activity of 3% and FXII antigen < 1%. To analyze the gene mutation in this FXII-deficient patient, we performed FXII mutation screening, and analyzed the DNA sequence of the F12 gene. A ClustalX-2.1-win and four online bioinformatics software services were used to study the conservatism and effects of the mutation. A transient in vitro expression study was performed to elucidate the possible pathological mechanism. Sequence analysis revealed a homozygous c.1681 G > A point mutation in exon 14, causing a novel Gly542Ser mutation in the catalytic domain. The results of the conservatism and bioinformatics analyses both indicated that the mutation likely affects the function of the protein. Additional expression studies in COS-7 cells showed that the antigen level of mutant FXII (FXII-Gly542Ser) was lower than wild type in culture medium, whereas the corresponding level of FXII antigen in cell lysates was equivalent. These results suggest that the Gly542Ser mutation causes FXII deficiency through intracellular degradation.
Collapse
|
5
|
The plasma contact system, a protease cascade at the nexus of inflammation, coagulation and immunity. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2017; 1864:2118-2127. [PMID: 28743596 DOI: 10.1016/j.bbamcr.2017.07.009] [Citation(s) in RCA: 85] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2017] [Revised: 07/14/2017] [Accepted: 07/19/2017] [Indexed: 01/11/2023]
Abstract
The contact system is a potent procoagulant and proinflammatory plasma protease cascade that is initiated by binding ("contact")-induced, auto-activation of factor XII zymogen. Formed active serine protease FXIIa then cleaves plasma prekallikrein to kallikrein that in turn liberates the mediator bradykinin from its precursor high molecular weight kininogen. Bradykinin induces inflammation with implications for host defense and innate immunity. FXIIa also triggers the intrinsic pathway of coagulation that has been shown to critically contribute to thrombosis. Vice versa, FXII deficiency impairs thrombosis in animal models without inducing abnormal excessive bleeding. Recent work has established the FXIIa-driven contact system as promising target for anticoagulant and anti-inflammatory drugs. This review focuses on the biochemistry of the contact system, its regulation by endogenous and exogenous inhibitors, and roles in disease states. This article is part of a Special Issue entitled: Proteolysis as a Regulatory Event in Pathophysiology edited by Stefan Rose-John.
Collapse
|
6
|
Zhang WG, Souri M, Ichinose A. Proteosomal degradation of naturally recurring R260C missense and exon-IV deletion mutants of factor XIII A-subunit expressed in mammalian cells. Haemophilia 2013; 19:415-9. [PMID: 23279035 DOI: 10.1111/hae.12072] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/12/2012] [Indexed: 11/27/2022]
Abstract
Congenital factor XIII (FXIII) deficiency is a severe bleeding disorder. We previously identified an Arg260Cys missense mutation and an exon-IV deletion in patients' A subunit genes, F13A. To characterize the molecular/cellular basis of this disease, we expressed a wild type and these mutant A subunits in baby hamster kidney (BHK) cells. The mutant proteins were expressed less efficiently than the wild type. These mutants gradually decreased inside BHK cells, whereas the wild type remained largely unchanged. The decline/decrease in these mutants was completely blocked/restored by a potent proteasome inhibitor, MG-132. This was consistent with the prediction by molecular modelling that the mutant molecules would lose the native structure of wild-type molecule, leading to their instability and degeneration and ultimately to degradation. These mutants might have significantly altered conformations, resulting in the rapid degradation by the proteasome inside the synthesizing cells, and ultimately leading to FXIII deficiency.
Collapse
Affiliation(s)
- W G Zhang
- Department of Molecular Patho-Biochemistry and Patho-Biology, Yamagata University School of Medicine, Yamagata, Japan
| | | | | |
Collapse
|
7
|
Suzuki K, Sugawara T, Ishida Y, Suwabe A. Compound heterozygous mutations (p.Leu13Pro and p.Tyr294*) associated with factor VII deficiency cause impaired secretion through ineffective translocation and extensive intracellular degradation of factor VII. Thromb Res 2012; 131:166-72. [PMID: 23141848 DOI: 10.1016/j.thromres.2012.10.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2012] [Revised: 10/10/2012] [Accepted: 10/17/2012] [Indexed: 11/20/2022]
Abstract
INTRODUCTION Congenital coagulation factor VII (FVII) deficiency is a rare coagulation disease. We investigated the molecular mechanisms of this FVII deficiency in a patient with compound heterozygous mutations. METHODS A 22-year-old Japanese female was diagnosed with asymptomatic FVII deficiency. The FVII activity and antigen were greatly reduced (activity, 13.0%; antigen, 10.8%). We analyzed the F7 gene of this patient and characterized mutant FVII proteins using in vitro expression studies. RESULTS Sequence analysis revealed that the patient was compound heterozygous with a point mutation (p.Leu13Pro) in the central hydrophobic core of the signal peptides and a novel non-sense mutation (p.Tyr294*) in the catalytic domain. Expression studies revealed that mutant FVII with p.Leu13Pro (FVII13P) showed less accumulation in the cells (17.5%) and less secretion into the medium (64.8%) than wild type showed. Truncated FVII resulting from p.Tyr294* (FVII294X) was also decreased in the cells (32.0%), but was not secreted into the medium. Pulse-chase experiments revealed that both mutants were extensively degraded intracellularly compared to wild type. The majority of FVII13P cannot translocate into endoplasmic reticulum (ER). However, a small amount of FVII13P was processed normally with post-translational modifications and was secreted into the medium. The fact that FVII294X was observed only in ER suggests that it is retained in ER. Proteasome apparently plays a central role in these degradations. CONCLUSIONS These findings demonstrate that both mutant FVIIs impaired secretion through ineffective translocation to and retention in ER with extensive intracellular degradation, resulting in an insufficient phenotype.
Collapse
Affiliation(s)
- Keijiro Suzuki
- Department of Laboratory Medicine, Iwate Medical University School of Medicine, Morioka, Iwate, Japan.
| | | | | | | |
Collapse
|
8
|
A novel factor XII mutation, FXII R84P, causing factor XII deficiency in a patient with hereditary spastic paraplegia. Blood Coagul Fibrinolysis 2011; 22:227-30. [DOI: 10.1097/mbc.0b013e328343f928] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
9
|
Johnson CY, Tuite A, Morange PE, Tregouet DA, Gagnon F. The factor XII -4C>T variant and risk of common thrombotic disorders: A HuGE review and meta-analysis of evidence from observational studies. Am J Epidemiol 2011; 173:136-44. [PMID: 21071604 DOI: 10.1093/aje/kwq349] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
Coagulation factor XII is involved in thrombus formation and therefore may play a role in the etiology of thrombotic disorders. A common variant in the factor XII (F12) gene (-4C>T, rs1801020) results in decreased plasma levels of this coagulation factor. The existence of associations between low factor XII levels or F12 variants and thrombotic outcomes has been debated for more than a decade. The authors conducted a review and meta-analysis to evaluate the evidence for an association between F12 -4C>T and 2 common thrombotic outcomes: venous thromboembolism and myocardial infarction, which are hypothesized to share some etiologic pathways. MEDLINE, EMBASE, and HuGE Navigator were searched through July 2009 to identify relevant epidemiologic studies, and data were summarized using random-effects meta-analysis. Sixteen candidate gene studies (4,386 cases, 40,089 controls) were analyzed. None of the investigated contrasts reached statistical significance at P < 0.05, apart from a very weak association with myocardial infarction for the TT + CT versus CC contrast (odds ratio = 1.13, 95% confidence interval: 1.00, 1.27). Overall, based on the synthesis of observational studies, the evidence for an association between F12 -4C>T and venous thromboembolism and myocardial infarction is weak.
Collapse
|
10
|
Molecular genetic analysis of Korean patients with coagulation factor XII deficiency. Blood Coagul Fibrinolysis 2010; 21:308-12. [DOI: 10.1097/mbc.0b013e32833449df] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
11
|
Suzuki K, Murai K, Suwabe A, Ishida Y. Factor XII Ofunato: Lys346Asn mutation associated with blood coagulation factor XII deficiency causes impaired secretion through a proteasome-mediated degradation. Thromb Res 2010; 125:438-43. [DOI: 10.1016/j.thromres.2009.12.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2009] [Revised: 10/30/2009] [Accepted: 12/02/2009] [Indexed: 11/25/2022]
|
12
|
Cuccioloni M, Montecchia F, Amici M, Mozzicafreddo M, Eleuteri AM, Angeletti M. Co-chaperonin GroES as a modulator of proteasomal activity. J Mol Recognit 2009; 22:46-54. [PMID: 19006106 DOI: 10.1002/jmr.929] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The proteasome has a crucial part in the degradation of normal, damaged, mutant or misfolded proteins within both the ubiquitin ATP-dependent and the ubiquitin ATP-independent pathways. Proteasome-mediated proteolysis is modulated by diverse factors, and in this regard, chaperonins have been attracting great interest. The investigation on the role of a co-chaperonin, namely GroES, in the modulation of proteasomal activity was the focus of this work. Our study reports on an analytical approach based on combined fluorimetric, chromatographic (applied to the enzymatic activity evaluation), surface plasmon resonance techniques and molecular modelling, addressed to the assessment and characterization of the interaction. Globally, we described a high affinity interaction between GroES and two different 20 S (immuno- and constitutive) proteasomes, uncovering new scenarios on their possible physio-pathological role, specifically on the ability of proteasomes to interact both with unfolding and folding- assisting macromolecules.
Collapse
Affiliation(s)
- Massimiliano Cuccioloni
- Department of Molecular, Cellular and Animal Biology, University of Camerino, Via Gentile III da Varano, 62032 Camerino, Italy.
| | | | | | | | | | | |
Collapse
|
13
|
Genetic study in patients with factor XII deficiency: a report of three new mutations exon 13 (Q501STOP), exon 14 (P547L) and –13C>T promoter region in three compound heterozygotes. Blood Coagul Fibrinolysis 2008; 19:639-43. [DOI: 10.1097/mbc.0b013e32830d8629] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
14
|
Kurotaki N, Shen JJ, Touyama M, Kondoh T, Visser R, Ozaki T, Nishimoto J, Shiihara T, Uetake K, Makita Y, Harada N, Raskin S, Brown CW, Höglund P, Okamoto N, Lupski JR. Phenotypic consequences of genetic variation at hemizygous alleles: Sotos syndrome is a contiguous gene syndrome incorporating coagulation factor twelve (FXII) deficiency. Genet Med 2008; 7:479-83. [PMID: 16170239 DOI: 10.1097/01.gim.0000177419.43309.37] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
PURPOSE We tested the hypothesis that Sotos syndrome (SoS) due to the common deletion is a contiguous gene syndrome incorporating plasma coagulation factor twelve (FXII) deficiency. The relationship between FXII activity and the genotype at a functional polymorphism of the FXII gene was investigated. METHODS A total of 21 patients including those with the common deletion, smaller deletions, and point mutations, and four control individuals were analyzed. We examined FXII activity in patients and controls, and analyzed their FXII 46C/T genotype using direct DNA sequencing. RESULTS Among 10 common deletion patients, seven patients had lower FXII activity with the 46T allele of the FXII gene, whereas three patients had normal FXII activity with the 46C allele. Two patients with smaller deletions, whose FXII gene is not deleted had low FXII activity, but one patient with a smaller deletion had normal FXII. Four point mutation patients and controls all had FXII activities within the normal range. CONCLUSION FXII activity in SoS patients with the common deletion is predominantly determined by the functional polymorphism of the remaining hemizygous FXII allele. Thus, Sotos syndrome is a contiguous gene syndrome incorporating coagulation factor twelve (FXII) deficiency.
Collapse
Affiliation(s)
- Naohiro Kurotaki
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas 77030, USA
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
15
|
Penders J, Delanghe JR. Alpha 1-microglobulin: clinical laboratory aspects and applications. Clin Chim Acta 2005; 346:107-18. [PMID: 15256311 DOI: 10.1016/j.cccn.2004.03.037] [Citation(s) in RCA: 93] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2003] [Revised: 03/22/2004] [Accepted: 03/24/2004] [Indexed: 02/06/2023]
Abstract
BACKGROUND Urinary microproteins are becoming increasingly important in clinical diagnostics. They can contribute in the non-invasive early detection of renal abnormalities and the differentiation of various nephrological and urological pathologies. Alpha 1-microglobulin (A1M) is an immunomodulatory protein with a broad spectrum of possible clinical applications and seems a promising marker for evaluation of tubular function. METHOD We performed a systematic review of the peer-reviewed literature (until end of November 2003) on A1M with emphasis on clinical diagnostic utility and laboratory aspects. CONCLUSIONS A1M is a 27-kDa glycoprotein, present in various body fluids, with unknown exact biological function. The protein acts as a mediator of bacterial adhesion to polymer surfaces and is involved in inhibiting renal lithogenesis. Because A1M is not an acute phase protein, is stable in a broad range of physiological conditions and sensitive immunoassays have been developed, its measurement can be used for clinical purposes. Unfortunately, international standardisation is still lacking. Altered plasma/serum levels are usually due to impaired liver or kidney functions but are also observed in clinical conditions such as HIV and mood disorders. Urinary A1M provides a non-invasive, inexpensive diagnostic alternative for the diagnosis and monitoring of urinary tract disorders (early detection of tubular disorders such as heavy metal intoxications, diabetic nephropathy, urinary outflow disorders and pyelonephritis).
Collapse
Affiliation(s)
- Joris Penders
- Department of Clinical Chemistry, University Hospital Ghent-2P8, De Pintelaan 185, B-9000 Ghent, Belgium
| | | |
Collapse
|
16
|
Oguchi S, Ishii K, Moriki T, Takeshita E, Murata M, Ikeda Y, Watanabe K. Factor XII Shizuoka, a novel mutation (Ala392Thr) identified and characterized in a patient with congenital coagulation factor XII deficiency. Thromb Res 2005; 115:191-7. [PMID: 15617741 DOI: 10.1016/j.thromres.2004.08.027] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2004] [Revised: 08/09/2004] [Accepted: 08/09/2004] [Indexed: 11/21/2022]
Abstract
We identified a novel mutation (Ala392Thr) in the factor XII (FXII) gene of a patient with congenital FXII deficiency, designated Factor XII Shizuoka. The proband was an asymptomatic 63-year-old Japanese male with an abnormal coagulation test, discovered by chance during preoperative testing. The FXII activity was under 3% and antigen level was under 10%. Sequence analysis of the proband's FXII gene revealed a homozygous nucleotide substitution G to A in exon 10, resulting in the amino acid substitution Ala392 to Thr in the catalytic domain. We constructed the mutant FXII cDNA in an expression plasmid vector and transfected it into Chinese hamster ovary (CHO) cells. The recombinant wild-type FXII antigen was detected in the culture medium by immunoprecipitation assay, but the mutant FXII (A392T) was not observed. Both the wild-type FXII and A392T cell lysates, however, contained equivalent levels of FXII antigen and FXII mRNA, as estimated by Western blotting and quantitative reverse transcriptase-polymerase chain reaction (RT-PCR), respectively. These findings suggest that the Ala392 to Thr substitution impairs intracellular protein processing and causes a cross-reacting material -negative FXII deficiency.
Collapse
Affiliation(s)
- Shuji Oguchi
- Department of Laboratory Medicine, School of Medicine, Keio University, Tokyo, Japan
| | | | | | | | | | | | | |
Collapse
|
17
|
Ishii K, Oguchi S, Moriki T, Yatabe Y, Takeshita E, Murata M, Ikeda Y, Watanabe K. Genetic analyses and expression studies identified a novel mutation (W486C) as a molecular basis of congenital coagulation factor XII deficiency. Blood Coagul Fibrinolysis 2005; 15:367-73. [PMID: 15205584 DOI: 10.1097/01.mbc.0000114447.59147.d1] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
We analyzed the factor XII (FXII) gene of a patient with congenital FXII deficiency and identified a novel amino acid substitution (W486C) in the catalytic domain. The proband was an asymptomatic 49-year-old Japanese female with abnormal coagulation test, discovered by chance. The FXII activity and antigen level were both under 10%, suggesting a cross-reacting material-negative FXII deficiency. Sequence analysis of the proband's FXII gene revealed a homozygous nucleotide substitution G --> C in exon 12, resulting in the amino acid substitution W486C in the catalytic domain. We constructed the mutant FXII cDNA in an expression plasmid vector and transfected it into Chinese hamster ovary cells. The recombinant wild-type FXII antigen was detected in the culture medium by immunoprecipitation assay, but the mutant FXII (W486C) was not observed. On the other hand, both the wild-type FXII and W486C cell lysates contained FXII antigen and FXII mRNA, as estimated by western blotting and quantitative reverse transcriptase-polymerase chain reaction. These findings suggest that the W486C substitution of FXII impairs intracellular processing of the protein and/or transport system.
Collapse
Affiliation(s)
- Keiko Ishii
- Department of Laboratory Medicine, Division of Hematology, School of Medicine, Keio University, Tokyo, Japan
| | | | | | | | | | | | | | | |
Collapse
|
18
|
Yamazaki T, Nicolaes GAF, Sørensen KW, Dahlbäck B. Molecular basis of quantitative factor V deficiency associated with factor V R2 haplotype. Blood 2002; 100:2515-21. [PMID: 12239164 DOI: 10.1182/blood.v100.7.2515] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
To investigate the molecular mechanisms of the quantitative factor V (FV) deficiency associated with the FV R2 haplotype, 4 missense mutations, Met385Thr, His1299Arg, Met1736Val, and Asp2194Gly, identified in the R2 haplotype allele, were analyzed by in vitro expression studies. The FV variant carrying all 4 mutations showed a markedly lower steady-state expression level than wild-type FV because of low synthesis rate and impaired secretion of the mutant protein. The Asp2194Gly mutation was found to play a key role in the impaired secretion of the mutant FV by interfering with its transport from the endoplasmic reticulum to the Golgi complex. The deleterious effect of the Asp2194Gly mutation was shown to be dominant among the 4 mutations. The Met385Thr mutation and His1299Arg mutation had no effect on steady-state expression levels, but the secretion rates of the mutant proteins were moderately decreased by these mutations. The His1299Arg mutation partially impaired glycosylation in the C-terminal part of the B-domain of the mutant FV, which was supposed to affect the secretion rate, but not the steady-state expression level. It was also suggested that the Met385Thr mutation partially impairs posttranslational modification of the mutant FV without affecting the steady-state expression level. No deleterious effect of the Met1736Val mutation was observed in terms of expression and intracellular processing. Our in vitro data strongly suggest that the naturally existing R2 haplotype mutant FV, which carries all 4 mutations, has the potential to result in quantitative FV deficiency in vivo owing to impaired expression of the mutant protein when the Asp2194Gly mutation is present.
Collapse
Affiliation(s)
- Tomio Yamazaki
- Department of Laboratory Medicine, Division of Clinical Chemistry, Lund University, Wallenberg Laboratory, University Hospital, Malmö, Sweden.
| | | | | | | |
Collapse
|
19
|
Tokunaga F, Kousaka T, Koide T. Ubiquitin/proteasome-mediated protein degradation and quality control of misfolded proteins in the endoplasmic reticulum. Kidney Int 2001. [DOI: 10.1046/j.1523-1755.2001.00821-12.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
20
|
Endler G, Exner M, Mannhalter C, Meier S, Ruzicka K, Handler S, Panzer S, Wagner O, Quehenberger P. A common C-->T polymorphism at nt 46 in the promoter region of coagulation factor XII is associated with decreased factor XII activity. Thromb Res 2001; 101:255-60. [PMID: 11248286 DOI: 10.1016/s0049-3848(00)00404-7] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Coagulation factor XII (FXII) deficiency is rarely found to be associated with bleeding, but single reports demonstrated thromboembolic events in FXII-deficient patients. Currently, the biological role of FXII is still discussed controversially. It is well known that plasma levels of FXII show great interindividual variability. Recently, it has been demonstrated that a frequently occurring C-->T polymorphism in the FXII promoter region at nucleotide (nt) 46 is associated with lower plasma FXII activity levels in Orientals. In our study, we evaluated the frequency of this polymorphism in a randomly selected sample of newborns and investigated whether this C-->T polymorphism also contributes to the frequently observed moderate FXII deficiency in Europeans. We developed a new mutagenically separated polymerase chain reaction assay (MS PCR), which allows mutation detection without the use of restriction enzymes. Among 100 healthy newborns, we found 64% homozygous carriers of the wildtype FXII 46C allele, 29% were heterozygous for FXII C46T, and 7% homozygous for FXII 46T. Evaluation of plasma FXII activity and genotype in 80 randomly selected and unrelated individuals revealed a highly statistically significant (P<.001) association of the FXII 46T allele with reduced FXII plasma activity. Individuals carrying the homozygous FXII 46C genotype had a mean of 1.17 U/ml (+/-0.31 U/ml), individuals heterozygous for FXII C46T showed a mean of 0.70 U/ml (+/-0.31 U/ml), and subjects homozygous for FXII 46T had only 0.44 U/ml (+/-0.10 U/ml) plasma FXII activity.
Collapse
Affiliation(s)
- G Endler
- Department of Laboratory Medicine, University of Vienna Medical School, Vienna, Austria
| | | | | | | | | | | | | | | | | |
Collapse
|
21
|
Akerström B, Lögdberg L, Berggård T, Osmark P, Lindqvist A. alpha(1)-Microglobulin: a yellow-brown lipocalin. BIOCHIMICA ET BIOPHYSICA ACTA 2000; 1482:172-84. [PMID: 11058759 DOI: 10.1016/s0167-4838(00)00157-6] [Citation(s) in RCA: 96] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
alpha(1)-Microglobulin, also called protein HC, is a lipocalin with immunosuppressive properties. The protein has been found in a number of vertebrate species including frogs and fish. This review summarizes the present knowledge of its structure, biosynthesis, tissue distribution and immunoregulatory properties. alpha(1)-Microglobulin has a yellow-brown color and is size and charge heterogeneous. This is caused by an array of small chromophore prosthetic groups, attached to amino acid residues at the entrance of the lipocalin pocket. A gene in the lipocalin cluster encodes alpha(1)-microglobulin together with a Kunitz-type proteinase inhibitor, bikunin. The gene is translated into the alpha(1)-microglobulin-bikunin precursor, which is subsequently cleaved and the two proteins secreted to the blood separately. alpha(1)-Microglobulin is found in blood and in connective tissue in most organs. It is most abundant at interfaces between the cells of the body and the environment, such as in lungs, intestine, kidneys and placenta. alpha(1)-Microglobulin inhibits immunological functions of white blood cells in vitro, and its distribution is consistent with an anti-inflammatory and protective role in vivo.
Collapse
Affiliation(s)
- B Akerström
- Department of Cell and Molecular Biology, University of Lund, Sweden.
| | | | | | | | | |
Collapse
|