1
|
Soukarieh O, Meguerditchian C, Proust C, Aïssi D, Eyries M, Goyenvalle A, Trégouët DA. Common and Rare 5′UTR Variants Altering Upstream Open Reading Frames in Cardiovascular Genomics. Front Cardiovasc Med 2022; 9:841032. [PMID: 35387445 PMCID: PMC8977850 DOI: 10.3389/fcvm.2022.841032] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Accepted: 02/21/2022] [Indexed: 01/16/2023] Open
Abstract
High-throughput sequencing (HTS) technologies are revolutionizing the research and molecular diagnosis landscape by allowing the exploration of millions of nucleotide sequences at an unprecedented scale. These technologies are of particular interest in the identification of genetic variations contributing to the risk of rare (Mendelian) and common (multifactorial) human diseases. So far, they have led to numerous successes in identifying rare disease-causing mutations in coding regions, but few in non-coding regions that include introns, untranslated (UTR), and intergenic regions. One class of neglected non-coding variations is that of 5′UTR variants that alter upstream open reading frames (upORFs) of the coding sequence (CDS) of a natural protein coding transcript. Following a brief summary of the molecular bases of the origin and functions of upORFs, we will first review known 5′UTR variations altering upORFs and causing rare cardiovascular disorders (CVDs). We will then investigate whether upORF-affecting single nucleotide polymorphisms could be good candidates for explaining association signals detected in the context of genome-wide association studies for common complex CVDs.
Collapse
Affiliation(s)
- Omar Soukarieh
- INSERM, Bordeaux Population Health, U1219, Molecular Epidemiology of Vascular and Brain Disorders, University of Bordeaux, Bordeaux, France
- *Correspondence: Omar Soukarieh,
| | - Caroline Meguerditchian
- INSERM, Bordeaux Population Health, U1219, Molecular Epidemiology of Vascular and Brain Disorders, University of Bordeaux, Bordeaux, France
| | - Carole Proust
- INSERM, Bordeaux Population Health, U1219, Molecular Epidemiology of Vascular and Brain Disorders, University of Bordeaux, Bordeaux, France
| | - Dylan Aïssi
- INSERM, Bordeaux Population Health, U1219, Molecular Epidemiology of Vascular and Brain Disorders, University of Bordeaux, Bordeaux, France
| | - Mélanie Eyries
- Department of Genetics, Pitié-Salpêtrière Hospital, Assistance Publique-Hôpitaux de Paris, Sorbonne Université, Paris, France
| | | | - David-Alexandre Trégouët
- INSERM, Bordeaux Population Health, U1219, Molecular Epidemiology of Vascular and Brain Disorders, University of Bordeaux, Bordeaux, France
| |
Collapse
|
2
|
Corvillo F, de la Morena-Barrio ME, Marcos-Bravo C, López-Trascasa M, Vicente V, Emsley J, Caballero T, Corral J, López-Lera A. The FXII c.-4T>C Polymorphism as a Disease Modifier in Patients With Hereditary Angioedema Due to the FXII p.Thr328Lys Variant. Front Genet 2020; 11:1033. [PMID: 33133137 PMCID: PMC7549737 DOI: 10.3389/fgene.2020.01033] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Accepted: 08/11/2020] [Indexed: 11/30/2022] Open
Abstract
Background Hereditary angioedema due to the Thr328Lys variant in the coagulation factor XII (HAE-FXII) affects mainly women in whom the symptomatology is dependent on high estrogen levels. Clinical variability and incomplete penetrance are challenging features that hinder the diagnosis and management of HAE-FXII. The c.-4T>C Kozak polymorphism is the only common variation accounting for FXII plasma levels and was previously shown to modify the course of HAE due to C1-Inhibitor deficiency. Objectives To assess the influence of the c.-4T>C polymorphism on disease expression in 39 Spanish HAE-FXII index patients. Methods The c.-4T>C polymorphism was sequenced by the standard Sanger method, and HAE severity was calculated according to the score by Cumming et al. (2003) The activation of the contact system was quantified by the kallikrein-like activity of plasma in chromogenic assays upon activation with high-molecular-weight dextran sulfate. Results The c.-4CC genotype was overrepresented in the studied cohort: 82% were CC-homozygous (expected frequency = 59%) and 18% were CT-heterozygous (expected frequency = 39%) (p = 0.001). Patients with a c.-4CC genotype exhibited higher kallikrein-like activity (0.9659 ± 0.1136) than those with a c.-4TC genotype (0.7645 ± 0.1235) (p = 0.024) or healthy donors. Moreover, the polymorphism influenced HAE-FXII severity score (c.-4CC = 4.43 ± 2.28 vs c.-4TC = 2.0 ± 1.15; p = 0.006) but not the degree of estrogen dependence or time until remission. Conclusion The c.-4T>C polymorphism is overrepresented in a Spanish HAE-FXII cohort and significantly influences the degree of contact system activation and the clinical severity of the disease.
Collapse
Affiliation(s)
- Fernando Corvillo
- Centre for Biomedical Network Research on Rare Diseases (CIBERER), Madrid, Spain.,Hospital La Paz Institute for Health Research (IdiPaz), Madrid, Spain
| | - María Eugenia de la Morena-Barrio
- Centre for Biomedical Network Research on Rare Diseases (CIBERER), Madrid, Spain.,Hematology and Medical Oncology Department, University Hospital Morales Meseguer, Centro Regional de Hemodonación, University of Murcia, IMIB-Arrixaca, Murcia, Spain
| | - Carmen Marcos-Bravo
- Allergy Department, University Hospital Complex of Vigo, Hospital Meixoeiro, Vigo, Spain
| | - Margarita López-Trascasa
- Hospital La Paz Institute for Health Research (IdiPaz), Madrid, Spain.,Faculty of Medicine, Autonomous University of Madrid, Madrid, Spain
| | - Vicente Vicente
- Centre for Biomedical Network Research on Rare Diseases (CIBERER), Madrid, Spain.,Hematology and Medical Oncology Department, University Hospital Morales Meseguer, Centro Regional de Hemodonación, University of Murcia, IMIB-Arrixaca, Murcia, Spain
| | - Jonas Emsley
- Centre for Biomolecular Sciences, School of Pharmacy, University of Nottingham, Nottingham, United Kingdom
| | - Teresa Caballero
- Centre for Biomedical Network Research on Rare Diseases (CIBERER), Madrid, Spain.,Hospital La Paz Institute for Health Research (IdiPaz), Madrid, Spain.,Allergy Department, La Paz University Hospital, Madrid, Spain
| | - Javier Corral
- Centre for Biomedical Network Research on Rare Diseases (CIBERER), Madrid, Spain.,Hematology and Medical Oncology Department, University Hospital Morales Meseguer, Centro Regional de Hemodonación, University of Murcia, IMIB-Arrixaca, Murcia, Spain
| | - Alberto López-Lera
- Centre for Biomedical Network Research on Rare Diseases (CIBERER), Madrid, Spain.,Hospital La Paz Institute for Health Research (IdiPaz), Madrid, Spain
| |
Collapse
|
3
|
Zhang H, Li J, Chen H, Wu X. Establishing reference intervals of coagulation indices based on the ACL Top 700 system for children in Southwestern Fujian, China. Clin Biochem 2019; 75:78-82. [PMID: 31770522 DOI: 10.1016/j.clinbiochem.2019.11.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2019] [Revised: 11/06/2019] [Accepted: 11/07/2019] [Indexed: 10/25/2022]
Abstract
BACKGROUND Till date, China has not issued industry standards for reference intervals (RIs) of pediatric blood coagulation indices. Here, we evaluated changes in the coagulation indices in the venous blood of healthy children aged 29 days to 12 years derived using the ACL Top 700 system and established appropriate RIs. METHODS We analyzed venous blood from 1770 healthy children for five coagulation indices. RIs were established according to the Clinical and Laboratory Standards Institute C28-A3c guideline. RESULTS The coagulation indices were grouped by age. For prothrombin time (PT) and international normalization ratio (INR), the RIs of infants and toddlers were identical; preschool children had the same RI as school-age children. Pediatric RIs for PT and INR were slightly lower than those for adults. The RIs of activated partial thromboplastin time (APTT), thrombin time (TT), and fibrinogen (FIB) in childhood were divided into two groups by age (1 month to 1 year and 1-12 years). The RI of APTT in infants was the widest; the overall level of FIB in infants was the lowest; children's APTT and FIB RIs were lower than those of adults. The pattern of TT values and RI trends in childhood were similar to those of APTT. CONCLUSIONS There were minor changes in the RIs of coagulation indices for children. The RIs of PT, INR, APTT, TT, and FIB must be grouped by age. The RIs of coagulation indices for children were different from those for adults; therefore, establishing separate RIs for children is necessary.
Collapse
Affiliation(s)
- Huifen Zhang
- Department of Pediatric Internal Medicine, Women and Children's Hospital, School of Medicine, Xiamen University, Xiamen 361003, PR China
| | - Jiming Li
- Department of Medical Laboratory, Women and Children's Hospital, School of Medicine, Xiamen University, Xiamen 361003, PR China.
| | - Haichen Chen
- Department of Pediatric Surgery, Women and Children's Hospital, School of Medicine, Xiamen University, Xiamen 361003, PR China
| | - Xingdong Wu
- Department of Pediatric Internal Medicine, Women and Children's Hospital, School of Medicine, Xiamen University, Xiamen 361003, PR China
| |
Collapse
|
4
|
Wu X, Ding Q, Wang X, Dai J, Wu W. The prevalence of heterozygous F12 mutations in Chinese population and its relevance to incidents of thrombosis. BMC MEDICAL GENETICS 2018; 19:50. [PMID: 29587641 PMCID: PMC5870241 DOI: 10.1186/s12881-018-0557-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Accepted: 03/08/2018] [Indexed: 11/10/2022]
Abstract
BACKGROUND The contribution of moderate coagulation factor XII (FXII) deficiency to development of thromboembolism is still undetermined. We have tried to show the relevance of FXII deficiency to incidences of venous thrombosis by exploring the prevalence of F12 gene mutations in Chinese patients with thrombotic disorders. METHODS One hundred and six patients with venous thromboembolism (VTE) and 220 healthy controls were enrolled in study. The coding region and flanking sequences of F12 gene were amplified and sequenced to identify genetic variances. Patients with F12 mutations were also screened for other thrombotic risk factors. RESULTS Heterozygous F12 gene mutations were identified in 6 individuals with VTE and 10 healthy controls. Q336X and R66W were found in two healthy individuals; D291E was identified in a patient with DVT; and A343P was a recurrent mutation with a prevalence of 4.7% (5/106) in patient group and 3.6%(8/220) in healthy control. The prevalence of heterozygous mutations between the two groups had no significant difference. The association of A343P mutations with VTE was weak with an OR of 1.31 (95% CI 0.42-4.11). No other thrombophilia risk factors screened were positive in patients harboring heterozygous F12 mutations. CONCLUSIONS There were conflicting theories about the relationship between FXII deficiency and thrombosis formation. Heterozygous F12 mutation decreases the plasma FXII activity approximately by half and cause moderate FXII deficiency. Although multiple mutations were identified in both groups, the link between F12 heterozygous mutation and development of thrombotic disorders is weak and further studies are warranted to clarify their relationship.
Collapse
Affiliation(s)
- Xi Wu
- Department of Laboratory Medicine, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, No.197 Ruijin Second Road, Shanghai, 200025, China
| | - Qiulan Ding
- Department of Laboratory Medicine, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, No.197 Ruijin Second Road, Shanghai, 200025, China
| | - Xuefeng Wang
- Department of Laboratory Medicine, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, No.197 Ruijin Second Road, Shanghai, 200025, China
| | - Jing Dai
- Department of Laboratory Medicine, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, No.197 Ruijin Second Road, Shanghai, 200025, China.
| | - Wenman Wu
- Department of Laboratory Medicine, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, No.197 Ruijin Second Road, Shanghai, 200025, China. .,Faculty of Medical Laboratory Science, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, No.197 Ruijin Second Road, Shanghai, 200025, China.
| |
Collapse
|
5
|
Bender DE, Kloos MT, Pontius JU, Hinsdale ME, Bellinger DA. Molecular Characterization of Cat Factor XII Gene and Identification of a Mutation Causing Factor XII Deficiency in a Domestic Shorthair Cat Colony. Vet Pathol 2014; 52:312-20. [DOI: 10.1177/0300985814532821] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Coagulation factor XII (FXII) may be important in cardiovascular and inflammatory diseases. We have identified and characterized a naturally occurring mutation in the feline FXII gene that results in a mutant protein and enzymatic loss of activity. Feline intron/exon gene structure and sequence were acquired by comparing DNA sequences obtained from a fragmented Felis catus genomic sequence and the National Center for Biotechnology Information’s Cross Species Megablast of multiple species’ FXII gene sequences. Fourteen exons ranging in size from 57 to 222 base pairs were confirmed spanning 8 Kb on chromosome A1. The 1828–base pair feline FXII messenger RNA (mRNA) sequence contains an open reading frame that encodes a protein of 609 amino acids with high homology to human FXII protein. Total RNA and mRNA purified from liver tissue of 4 wild-type/normal and 8 FXII-deficient cats confirmed the predicted mRNA sequence and identified one important single-nucleotide polymorphism (SNP). A single base deletion in exon 11 of the FXII coding gene in our colony of cats results in deficient FXII activity. Translation of the mRNA transcript shows a frame shift at L441 (C441fsX119) resulting in a nonsense mutation and a premature stop codon with a predicted 560–amino acid protein. The mutant FXII protein is truncated in the 3′ proteolytic light chain region of the C-terminus, explaining its loss of enzymatic activity. This study is the first molecular characterization of the feline FXII gene and the first identification of an FXII mutation in the domestic cat, providing insights into the origin and nature of feline FXII deficiency.
Collapse
Affiliation(s)
| | - M. T. Kloos
- University of North Carolina, Chapel Hill, NC, USA
| | | | | | | |
Collapse
|
6
|
Genetic analysis of a pedigree with combined factor XII and factor XI deficiency. Blood Coagul Fibrinolysis 2011; 22:118-22. [PMID: 21192253 DOI: 10.1097/mbc.0b013e3283433147] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
The objective of the present study was to identify the gene mutations of factor XI (FXI) and factor XII (FXII) in a Chinese pedigree with combined congenital FXI and FXII deficiencies. The proband was a 40-year-old woman with deficiency in both FXI (49%) and FXII (0%) activities. Blood samples from 10 other members of her family were collected and used for detection of FXI, FXII activities (FXI: C, FXII: C) and antigen levels. Genetic analysis to detect mutations in FXI, FXII genes was also performed. The proband's mother, three brothers, two sisters, her son and her daughter all have lowered FXII: C. Furthermore, her mother and one of her brothers also have lowered FXI: C. Gene sequencing for FXI in affected members revealed a heterozygous C23179T point mutation in exon 11 resulting in substitution of arginine 396 by cysteine. Gene sequencing for FXII revealed a C46T in the promoter region and a deletion mutation of two nucleotides CA at position 9160 and 9161 in exon 5. The deletion mutation can lead to frameshift mutation and premature termination of transcription in exon 6. We found a new heterozygous missense mutation in the FXI gene and a new nonsense mutation of two nucleotides deletion which caused frameshift mutation and premature termination of transcription in the FXII gene in a Chinese family with combined FXI and FXII deficiencies.
Collapse
|
7
|
Guerrero JA, Rivera J, Quiroga T, Martinez-Perez A, Antón AI, Martínez C, Panes O, Vicente V, Mezzano D, Soria JM, Corral J. Novel loci involved in platelet function and platelet count identified by a genome-wide study performed in children. Haematologica 2011; 96:1335-43. [PMID: 21546496 DOI: 10.3324/haematol.2011.042077] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND Genome-wide association studies are currently identifying new loci with potential roles in thrombosis and hemostasis: these loci include novel polymorphisms associated with platelet function traits and count. However, no genome-wide study performed on children has been reported to date, in spite of the potential that these subjects have in genetic studies, when compared to adults, given the minimal degree of confounders, i.e., acquired and environmental factors, such as smoking, physical activity, diet, and drug or hormone intake, which are particularly important in platelet function. DESIGN AND METHODS To identify new genetic variants involved in platelet reactivity and count, we performed a genome-wide association study on 75 children (8.5±1.8 years) using the Illumina Sentrix Human CNV370-Quad BeadChip containing 320,610 single nucleotide polymorphisms. Functional analyses included assessment of platelet aggregation and granule secretion triggered by different agonists (arachidonic acid, collagen, epinephrine, ADP), as well as platelet count. Associations were selected based on statistical significance and physiological relevance for a subsequent replication study in a similar sample of 286 children. RESULTS We confirmed previously established associations with plasma levels of factors XII, VII and VIII as well as associations with platelet responses to ADP. Additionally, we identified 82 associations with platelet reactivity and count with a P value less than 10(-5). From the associations selected for further replication, we validated two single nucleotide polymorphisms with mildly increased platelet reactivity (rs4366150 and rs1787566) on the LPAR1 and MYO5B genes, encoding lisophosphatidic acid receptor-1 and myosin VB, respectively; and rs1937970, located on the NRG3 gene coding neuroregulin-3, associated with platelet count. CONCLUSIONS Our genome-wide association study performed in children, followed by a validation analysis, led us to the identification of new genes potentially relevant in platelet function and biogenesis.
Collapse
Affiliation(s)
- José A Guerrero
- University of Murcia, Centro Regional de Hemodonación, Murcia, Spain
| | | | | | | | | | | | | | | | | | | | | |
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
|
Athanasiadis G, González-Pérez E, Esteban E, Dugoujon JM, Stoneking M, Moral P. The Mediterranean Sea as a barrier to gene flow: evidence from variation in and around the F7 and F12 genomic regions. BMC Evol Biol 2010; 10:84. [PMID: 20346176 PMCID: PMC2853540 DOI: 10.1186/1471-2148-10-84] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2009] [Accepted: 03/27/2010] [Indexed: 11/30/2022] Open
Abstract
Background The Mediterranean has a long history of interactions among different peoples. In this study, we investigate the genetic relationships among thirteen population samples from the broader Mediterranean region together with three other groups from the Ivory Coast and Bolivia with a particular focus on the genetic structure between North Africa and South Europe. Analyses were carried out on a diverse set of neutral and functional polymorphisms located in and around the coagulation factor VII and XII genomic regions (F7 and F12). Results Principal component analysis revealed a significant clustering of the Mediterranean samples into North African and South European groups consistent with the results from the hierarchical AMOVA, which showed a low but significant differentiation between groups from the two shores. For the same range of geographic distances, populations from each side of the Mediterranean were found to differ genetically more than populations within the same side. To further investigate this differentiation, we carried out haplotype analyses, which provided partial evidence that sub-Saharan gene flow was higher towards North Africa than South Europe. Conclusions As there is no consensus between the two genomic regions regarding gene flow through the Sahara, it is hard to reach a solid conclusion about its role in the differentiation between the two Mediterranean shores and more data are necessary to reach a definite conclusion. However our data suggest that the Mediterranean Sea was at least partially a barrier to gene flow between the two shores.
Collapse
Affiliation(s)
- Georgios Athanasiadis
- Unitat d'Antropologia, Facultat de Biologia, Universitat de Barcelona, Barcelona, Spain
| | | | | | | | | | | |
Collapse
|
10
|
Combined cis-regulator elements as important mechanism affecting FXII plasma levels. Thromb Res 2009; 125:e55-60. [PMID: 19786295 DOI: 10.1016/j.thromres.2009.08.019] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2009] [Revised: 08/04/2009] [Accepted: 08/18/2009] [Indexed: 01/24/2023]
Abstract
INTRODUCTION Factor XII (FXII) deficiency is a recessive Mendelian trait due to mutations in the F12 gene. There is no bleeding associated with FXII deficiency, but FXII deficiency has been reported to be associated with risk of thrombosis in some studies. MATERIAL AND METHODS We examined the functional effect of two naturally-occurring mutations in two Spanish FXII deficient families: a C/G substitution at position -8, and a C/T substitution at position -13. Both mutations were located on a putative HNF4 binding site of F12 gene promoter. We also analyzed the F12 C46T polymorphism (rs1801020), associated with a decrease in the FXII levels, which also segregated in both families. A fragment containing each one of both -8 and -13 mutations, was cloned 5' of a reporter gene. We compared the in vitro expression of these constructs to the wild type expression. RESULTS Our analyses confirm that the -8C/G and the -13C/T mutations decreased expression levels, demonstrating that both mutations are involved in the observed FXII deficiency. In addition, electrophoretic shift analyses suggest that they alter the union of nuclear proteins to the promoter. Coinheritance of these mutations with the C46T polymorphism, result in a significant genotype-phenotype correlation. CONCLUSIONS We have identified two naturally-occurring mutations in the F12 promoter that drastically reduce FXII levels. Knowing rare genetic alterations in the F12 gene, together with the C46T common variant, may yield further understanding about the genetic architecture of FXII levels, which may have a role in the risk of thrombosis.
Collapse
|
11
|
Yazdani-Biuki B, Krippl P, Brickmann K, Fuerst F, Langsenlehner U, Paulweber B, Pilger E, Wascher TC, Brezinschek HP, Renner W. The Functional Promoter Polymorphism of the Coagulation Factor XII Gene is not Associated With Peripheral Arterial Disease. Angiology 2009; 61:211-5. [DOI: 10.1177/0003319709337305] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Coagulation factor XII (FXII) plays a key role in both coagulation and fibrinolysis and has been associated with cardiovascular disease in some studies. Plasma FXIIa levels are strongly determined by a common functional polymorphism in the promoter of the FXII gene (F12-4C>T). To investigate the potential association of this polymorphism with peripheral arterial disease (PAD), we performed a case-control study including 668 patients with PAD and 762 controls participants without cardiovascular disease. F12 genotype frequencies were not significantly different between patients with PAD and control participants. After adjustment for classical risk factors, the odds ratio of carriers of a F12 -4T allele for PAD was 1.06 (95% confidence interval 0.86—1.32). F12 genotypes were associated with a modest increase of the mean-activated partial thromboplastin time but not with PAD stage or severity. We conclude that the functional F124C>T polymorphism is not associated with PAD.
Collapse
Affiliation(s)
| | - Peter Krippl
- Department of Internal Medicine, Regional Hospital of Fuerstenfeld, Austria
| | | | | | - Uwe Langsenlehner
- Internal Outpatient Department, Steiermaerkische Gebietskrankenkasse, Graz, Austria
| | | | - Ernst Pilger
- Division of Angiology, Medical University Graz, Austria
| | - Thomas C. Wascher
- Division of Metabolism and Vascular Biology Unit, Department of Medicine, Medical University Graz, Austria
| | | | - Wilfried Renner
- Division of Clinical Institute of Medical and Chemical Laboratory Diagnostics, Medical University Graz, Austria, wilfried.renner@ medunigraz.at
| |
Collapse
|
12
|
Upstream open reading frames cause widespread reduction of protein expression and are polymorphic among humans. Proc Natl Acad Sci U S A 2009; 106:7507-12. [PMID: 19372376 DOI: 10.1073/pnas.0810916106] [Citation(s) in RCA: 609] [Impact Index Per Article: 40.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Upstream ORFs (uORFs) are mRNA elements defined by a start codon in the 5' UTR that is out-of-frame with the main coding sequence. Although uORFs are present in approximately half of human and mouse transcripts, no study has investigated their global impact on protein expression. Here, we report that uORFs correlate with significantly reduced protein expression of the downstream ORF, based on analysis of 11,649 matched mRNA and protein measurements from 4 published mammalian studies. Using reporter constructs to test 25 selected uORFs, we estimate that uORFs typically reduce protein expression by 30-80%, with a modest impact on mRNA levels. We additionally identify polymorphisms that alter uORF presence in 509 human genes. Finally, we report that 5 uORF-altering mutations, detected within genes previously linked to human diseases, dramatically silence expression of the downstream protein. Together, our results suggest that uORFs influence the protein expression of thousands of mammalian genes and that variation in these elements can influence human phenotype and disease.
Collapse
|
13
|
Li J, Lai X, Yan C, Xu A, Nie L, Zhou Y, Liao C, Ren H. Age-associated developmental changes in the activated partial thromboplastin time (APTT) and causes of prolonged APTT values in healthy Chinese children. Clin Chem Lab Med 2009; 47:1531-7. [DOI: 10.1515/cclm.2009.339] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
14
|
|
15
|
Leitner JM, Mannhalter C, Jilma B. Genetic variations and their influence on risk and treatment of venous thrombosis. Pharmacogenomics 2008; 9:423-37. [PMID: 18384256 DOI: 10.2217/14622416.9.4.423] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Venous thrombosis (VT) is a highly prevalent disease. Risk factors can be genetic or acquired. The well-established genetic polymorphisms predisposing to thrombophilic disorders can be divided into rare 'loss-of-function mutations' in anticoagulant proteins and common 'gain-of-function mutations' in procoagulant proteins, which are weaker risk factors. In addition to functional polymorphisms, defects in common pathways affecting biosynthesis or clearance of plasma coagulation factors and their relations to VT risk have been detected. Recently, investigations regarding genetic variations and response to drug treatment, relevant for the pathogenesis as well as therapy of venous thromboembolism have been performed. The methodical advances in genetic research have led to the identification of a number of new variants with still unclear association to VT. This review aims to discuss the established genetic risk factors as well as some candidate predictors of VT. Further, the recent developments in pharmacogenomics are reviewed.
Collapse
Affiliation(s)
- Judith Maria Leitner
- Department of Clinical Pharmacology, Division for Hematology & Immunology, Medical University of Vienna, Währinger Gürtel 18-20, A-1090 Wien, Austria
| | | | | |
Collapse
|
16
|
Bach J, Endler G, Winkelmann BR, Boehm BO, Maerz W, Mannhalter C, Hellstern P. Coagulation factor XII (FXII) activity, activated FXII, distribution of FXII C46T gene polymorphism and coronary risk. J Thromb Haemost 2008; 6:291-6. [PMID: 18021303 DOI: 10.1111/j.1538-7836.2008.02839.x] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND Whether factor XII (FXII) activity, its 46C>T polymorphism and activated FXII (FXIIa) are associated with coronary heart disease (CHD) remains to be determined. METHODS FXII, FXIIa and the FXII 46C>T polymorphism were determined in a hospital-based cohort of 2615 patients undergoing coronary angiography. RESULTS Fifty-seven per cent of the participants were identified as wild-type (46CC), 38% as heterozygous (46CT) and 5% as homozygous (46TT) for FXII 46C>T. FXII and FXIIa levels were significantly lower in carriers of the T-allele: 132 (97-151) U dL(-1) FXII in 46CC, 87 (77-99) U dL(-1) FXII in 46CT and 53 (42-67) U dL(-1) FXII in 46TT carriers (P < 0.001), and 2.8 (2.3-3.5) microg L(-1) FXIIa in CC, 2.1 (1.6-2.6) microg L(-1) FXIIa in CT and 1.2 (0.9-1.5) microg L(-1) FXIIa in TT carriers (P < 0.001; medians, lower and upper quartiles). Patients with stable CHD (n = 935), a history of myocardial infarction (n = 785) or who were suffering from acute coronary syndromes (ACS; n = 323) had significantly lower FXII levels than controls (n = 572). The differences remained statistically significant after adjustments for age, sex, diabetes mellitus, smoking, hypercholesterolemia and hypertension. Significantly reduced FXIIa levels in ACS patients lost significance once adjusted for covariates. FXII genotype was not associated with any clinical phenotype. CONCLUSION Lower FXII activity represents an independent risk for CHD and ACS. This is not the case for FXIIa levels or the FXII 46C>T variation.
Collapse
Affiliation(s)
- J Bach
- Institute of Hemostaseology and Transfusion Medicine, Academic City Hospital, Ludwigshafen, Germany
| | | | | | | | | | | | | |
Collapse
|
17
|
Bach J, Endler G, Winkelmann BR, Boehm BO, Maerz W, Mannhalter C, Hellstern P. Coagulation factor XII (FXII) activity, activated FXII, distribution of FXII C46T gene polymorphism and coronary risk. J Thromb Haemost 2007; 6:291-6. [PMID: 18021303 DOI: 10.1111/j.1538-7836.2007.02839.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND Whether factor XII (FXII) activity, its 46C>T polymorphism and activated FXII (FXIIa) are associated with coronary heart disease (CHD) remains to be determined. METHODS FXII, FXIIa and the FXII 46C>T polymorphism were determined in a hospital-based cohort of 2615 patients undergoing coronary angiography. RESULTS Fifty-seven per cent of the participants were identified as wild-type (46CC), 38% as heterozygous (46CT) and 5% as homozygous (46TT) for FXII 46C>T. FXII and FXIIa levels were significantly lower in carriers of the T-allele: 132 (97-151) U dL(-1) FXII in 46CC, 87 (77-99) U dL(-1) FXII in 46CT and 53 (42-67) U dL(-1) FXII in 46TT carriers (P < 0.001), and 2.8 (2.3-3.5) microg L(-1) FXIIa in CC, 2.1 (1.6-2.6) microg L(-1) FXIIa in CT and 1.2 (0.9-1.5) microg L(-1) FXIIa in TT carriers (P < 0.001; medians, lower and upper quartiles). Patients with stable CHD (n = 935), a history of myocardial infarction (n = 785) or who were suffering from acute coronary syndromes (ACS; n = 323) had significantly lower FXII levels than controls (n = 572). The differences remained statistically significant after adjustments for age, sex, diabetes mellitus, smoking, hypercholesterolemia and hypertension. Significantly reduced FXIIa levels in ACS patients lost significance once adjusted for covariates. FXII genotype was not associated with any clinical phenotype. CONCLUSION Lower FXII activity represents an independent risk for CHD and ACS. This is not the case for FXIIa levels or the FXII 46C>T variation.
Collapse
Affiliation(s)
- J Bach
- Institute of Hemostaseology and Transfusion Medicine, Academic City Hospital, Ludwigshafen, Germany
| | | | | | | | | | | | | |
Collapse
|
18
|
Schousboe I. Pharmacological regulation of factor XII activation may be a new target to control pathological coagulation. Biochem Pharmacol 2007; 75:1007-13. [PMID: 17996217 DOI: 10.1016/j.bcp.2007.10.003] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2007] [Revised: 10/03/2007] [Accepted: 10/03/2007] [Indexed: 11/29/2022]
Abstract
FXII was identified 50 years ago as a coagulation protein in the intrinsic pathway of blood coagulation as FXII deficient patients had marked prolongation of the in vitro surface-activated coagulation time. However, series of investigations have convincingly shown that FXII has no role in normal hemostasis. Recently, experimentally induced thrombosis in factor XII-knockout mice has provided evidence that factor XII (FXII) deficient mice are protected against ischemic brain injury after obstructive clot formation. Based on these experiments it has, therefore, been suggested, that blocking of FXII could be a unique target to prevent obstructive clot formation in arterial thrombosis without side effect of increased bleeding. FXII deficiency has, however, not convincingly been shown to protect against arterial thrombosis in humans. The target mentioned above may either be an inhibition of FXII activation or an inhibition of its proteolytic activity. FXII is a zymogen of the proteolytic enzyme, FXIIa, the substrates of which are factor XI and prekallikrein. Thus, FXIIa is not only involved in the activation of the coagulation system, but is also associated with the kallikrein/kinin system. The activation of the latter is deeply involved in inflammation and pain sensation. Furthermore, FXIIa binds to endothelial cells and to the extracellular matrix, indicating a role in vascular repair. Therefore, a complete evaluation of all these properties of FXII and FXIIa has to be considered when formulating a strategy for blocking FXII activation.
Collapse
Affiliation(s)
- Inger Schousboe
- Department of Biomedical Sciences, Heart and Circulatory Research Section, The Panum Institute, University of Copenhagen, Blegdamsvej 3C, DK-2200 Copenhagen, Denmark.
| |
Collapse
|
19
|
Sotiriadis A, Makrigiannakis A, Stefos T, Paraskevaidis E, Kalantaridou SN. Fibrinolytic defects and recurrent miscarriage: a systematic review and meta-analysis. Obstet Gynecol 2007; 109:1146-55. [PMID: 17470597 DOI: 10.1097/01.aog.0000260873.94196.d6] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
OBJECTIVE To systematically review evidence of the association between fibrinolytic defects and recurrent miscarriage. DATA SOURCES MEDLINE, EMBASE, and references of retrieved articles (last update September 2006) were used. METHODS OF STUDY SELECTION Studies comparing the prevalence of fibrinolytic defects in patients with recurrent miscarriage and control women were reviewed. Of 111 potentially relevant studies, data from 14 were integrated with meta-analytic techniques and were presented as odds ratios (ORs). TABULATION, INTEGRATION, AND RESULTS Plasminogen activator inhibitor-1 4G/5G polymorphism (OR 1.65, 95% confidence interval [CI] 0.92-2.95) and increased plasminogen activator inhibitor activity were not significantly associated with recurrent miscarriage, although the latter showed profound heterogeneity across studies. Although factor XII C46T polymorphism is not associated with recurrent miscarriage (OR 1.07, 95% CI 0.52-2.22), factor XII deficiency is significantly associated (five studies, 1,096 women; OR 18.11, 95% CI 5.52-59.39), with minimal heterogeneity across studies. Factor XIII Val34Leu and Tyr204Phe polymorphisms were not associated with recurrent miscarriage (OR 1.24, 95% CI 0.46-3.34 and OR 2.61, 95% CI 0.45-15.16, respectively). There were no eligible studies found for the rest of the factors searched (urokinase-type plasminogen activator, tissue-type plasminogen activator, kallicrein, a2-antiplasmin, a2-macroglobulin, thrombin-activated thrombolysis inhibitor, and factor XI). Only a small minority of studies ascertained miscarriage according to specific criteria, and none of the studies provided equal examination for confounders in cases and controls. CONCLUSION Factor XII deficiency is associated with recurrent miscarriage. Data on the other factors either fail to show association or are quite limited.
Collapse
|
20
|
Endler G, Marsik C, Jilma B, Schickbauer T, Quehenberger P, Mannhalter C. Evidence of a U-shaped association between factor XII activity and overall survival. J Thromb Haemost 2007; 5:1143-8. [PMID: 17388965 DOI: 10.1111/j.1538-7836.2007.02530.x] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
INTRODUCTION The clinical relevance of decreased coagulation factor XII (FXII) plasma activity as a risk factor for both venous and arterial thrombosis is still discussed controversially. The current study evaluated the predictive value of FXII levels for all-cause mortality in a large Viennese patient cohort. PATIENTS AND METHODS Individuals, whose FXII activity levels were determined for suspected coagulation disorders or thrombophilia screening between 1991-2003 were included in this study (n = 8936, 51% male, 49% female, median age 43 years). Death/survival was determined by record linkage with the Austrian Death Registry. The median observation period was 5 years covering a total of 46 400 person years; the death rate was 17.1%. For Cox regression analysis, FXII plasma activity was divided into 11 categories of 10% steps with the category of > 100% FXII serving as a reference category. RESULTS With decreasing FXII plasma activity, hazard ratios for all-cause mortality gradually increased linearly from 1.0 in the > 100% category to 1.5 (95% CI: 1.2-1.9) in the 80-90% category to 4.7 (95% CI: 3.4-6.5) in the 10-20% category. Similar results were obtained, when only vascular mortality or death as a result of ischemic heart disease was considered. No significant increase in all-cause mortality (HR: 1.4, 95%CI 0.7-2.8) was observed in the small group of FXII-deficient subjects [0-10% category (n = 58)]. CONCLUSIONS This study first demonstrates a strong and almost linear association of FXII plasma activity between 90% and 10% with all-cause mortality in a large Viennese patient cohort. Interestingly, mortality rates are not increased when FXII activity is below 10%, resulting in a U-shaped survival curve.
Collapse
Affiliation(s)
- G Endler
- Clinical Institute of Medical and Chemical Laboratory Diagnostics, Medical University of Vienna, Vienna, Austria
| | | | | | | | | | | |
Collapse
|
21
|
Cochery-Nouvellon E, Mercier E, Lissalde-Lavigne G, Daurès JP, Quéré I, Dauzat M, Marès P, Gris JC. Homozygosity for the C46T polymorphism of the F12 gene is a risk factor for venous thrombosis during the first pregnancy. J Thromb Haemost 2007; 5:700-7. [PMID: 17408404 DOI: 10.1111/j.1538-7836.2007.02423.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND A first thromboembolic event during pregnancy and puerperium is predisposed to by polymorphisms G1691A in the factor V gene (F5) (F5G1691A) and G20210A in the prothrombin gene (F2) (F2G20210A). OBJECTIVES To study another potentially frequent thrombogenic polymorphism, C46T in the factor XII gene (F12) (F12C46T). PATIENTS AND METHODS The 32 463 previously asymptomatic women included in the NOHA First cohort in their first pregnancy were investigated for these three polymorphisms. No other constitutional or acquired thrombophilic risk factor was studied. RESULTS The overall incidence--absolute risk--of venous thromboembolic events (VTE) was 127 per 100,000 woman-years and was reduced to 22 per 100,000 women-years in women negative for the three polymorphisms (P < 0.0001). Homozygosity for F12C46T was associated with a significant relative risk (RR) of VTE [RR: 5.99, 95% confidence interval (95% CI): 2.1-17.3, P = 0.001], as was heterozygosity for F5G1691A (RR: 18.7, 95% CI: 8.3-42, P < 0.0001), heterozygosity for F2G20210A (RR: 14.3, 95% CI: 6.2-33.2, P < 0.0001), maternal age (RR: 1.18, 95% CI: 1.07-1.29, P = 0.0006), maternal body mass index (RR: 1.31, 95% CI: 1.11-1.55, P = 0.002), conceptus weight (percentiles adjusted for term of delivery; RR: 0.90, 95% CI: 0.88-0.93, P < 0.0001) and pre-eclampsia (RR: 3.03, 95% CI: 1.06-8.69, P = 0.039). CONCLUSIONS Homozygosity for the C46T polymorphism of the F12 gene is associated with venous thrombosis during the first pregnancy/puerperium in previously asymptomatic women.
Collapse
|
22
|
Walch K, Riener EK, Tempfer CB, Endler G, Huber JC, Unfried G. The C46T polymorphism of the coagulation factor XII gene and idiopathic recurrent miscarriage. BJOG 2005; 112:1434-6. [PMID: 16167952 DOI: 10.1111/j.1471-0528.2005.00686.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Thrombophilia has been described to be involved in the pathogenesis of idiopathic recurrent miscarriage (IRM). We investigated the association between IRM and a C-->T polymorphism at nucleotide 46 in the 5'-untranslated region of the coagulation factor XII (FXII) gene. Two hundred and twelve women with a history of IRM and 149 healthy controls were tested by a mutagenically separated polymerase chain reaction assay (MS PCR). Allele and genotype frequencies were not significantly different between the study and the control groups. Our data suggest that the FXII gene is not a candidate gene for this condition.
Collapse
Affiliation(s)
- Katharina Walch
- Department of Gynecologic Endocrinology and Reproductive Medicine, University of Vienna School of Medicine, Vienna, Austria
| | | | | | | | | | | |
Collapse
|
23
|
Grünbacher G, Marx-Neuhold E, Pilger E, Köppel H, Renner W. The functional -4C>T polymorphism of the coagulation factor XII gene is not associated with deep venous thrombosis. J Thromb Haemost 2005; 3:2815-7. [PMID: 16359524 DOI: 10.1111/j.1538-7836.2005.01651.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
24
|
Singer G, Schalamon J, Ainoedhofer H, Petek E, Kroisel PM, Höllwarth ME. Williams-Beuren syndrome associated with caudal regression syndrome and coagulopathy--a case report. J Pediatr Surg 2005; 40:e47-50. [PMID: 16291141 DOI: 10.1016/j.jpedsurg.2005.07.048] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Williams-Beuren syndrome is a genetic disorder caused by a heterozygous deletion at 7q11.23. The present report describes a female patient with Williams-Beuren syndrome combined with caudal regression syndrome and two forms of coagulopathy. Besides the typical developmental abnormalities such as mental and growth retardation, a distinctive facial appearance, and cardiovascular anomalies, our patient showed fusion of fourth and fifth lumbar vertebra and a sacrococcygeal agenesis. Blood coagulation tests revealed a deficiency of coagulation factor XI and XII. Magnetic resonance imaging angiography showed multiple vascular stenoses mainly in the abdominal aorta and its major branches as a consequence of the insufficient elastin gene. Previous reports identified a deletion of HLXB9 as a possible genetic cause of the caudal regression syndrome, which could not be identified in the present case. This unusual combination of the above-mentioned genetic disorders has not been published so far.
Collapse
Affiliation(s)
- Georg Singer
- Department of Pediatric Surgery, Medical University of Graz, 8036 Graz, Austria.
| | | | | | | | | | | |
Collapse
|
25
|
Weger M, Renner W, Steinbrugger I, Cichocki L, Temmel W, Stanger O, El-Shabrawi Y, Lechner H, Schmut O, Haas A. Role of thrombophilic gene polymorphisms in branch retinal vein occlusion. Ophthalmology 2005; 112:1910-5. [PMID: 16157382 DOI: 10.1016/j.ophtha.2005.05.019] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2005] [Accepted: 05/29/2005] [Indexed: 10/25/2022] Open
Abstract
OBJECTIVE Branch retinal vein occlusion (BRVO) is a common cause of severe visual loss. Numerous risk factors, including arterial hypertension, diabetes mellitus, and arteriosclerosis, have been identified. Gene polymorphisms affecting hemostasis may also play a role in the pathogenesis of BRVO. The present study was therefore done to determine the prevalence of genetic polymorphisms in factors implicated in hypercoagulability among patients with BRVO. DESIGN Retrospective case-control study. PARTICIPANTS The study cohort consisted of 294 patients with BRVO and 294 control subjects, matched for age and gender. METHODS Determination of genotypes was done by allele-specific digestion of polymerase chain reaction products, or by 5' exonuclease assay (TaqMan). MAIN OUTCOME PARAMETERS Genotypes of factor V R506Q (factor V Leiden), prothrombin 20210G>A, fibrinogen beta -455G> A, factor XII (FXII) 46C>T, and ITGA2 807C>T (platelet glycoprotein Ia [GPIa] 807C>T) and ITGB3 L59P (platelet GPIIIa PlA1/PlA2) polymorphisms. RESULTS Genotype distributions of the investigated gene polymorphisms did not differ significantly between patients and control subjects. In contrast, significantly increased prevalences of arterial hypertension and hypercholesterolemia were found among patients with BRVO. In a logistic regression analysis, the presence of arterial hypertension was associated with an odds ratio (OR) of 2.32 (95% confidence interval [CI], 1.62-3.32), whereas hypercholesterolemia yielded an OR of 2.54 (95% CI, 1.74-3.70) for BRVO. CONCLUSION Our data indicate that the prevalences of the investigated gene polymorphisms do not differ significantly in patients with BRVO and control subjects. This suggests that these polymorphisms are not major risk factors for BRVO.
Collapse
Affiliation(s)
- Martin Weger
- Department of Ophthalmology, Medical University Graz, Graz, Austria.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
26
|
Pérez-Montes R, Sedano C, Yáñez L, Pérez-Puente A, Vallverdu H, Hernández JL, Iriondo A. Deep venous thrombosis, protein S deficiency and homozygous Factor XII 46T mutation. Eur J Pediatr 2005; 164:591-3. [PMID: 15912386 DOI: 10.1007/s00431-005-1690-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/07/2005] [Accepted: 04/03/2005] [Indexed: 10/25/2022]
Affiliation(s)
- Rocío Pérez-Montes
- Department of Haematology, Marqués de Valdecilla Hospital, Valdecilla Avenue s/n, 39008 Santander, Spain.
| | | | | | | | | | | | | |
Collapse
|
27
|
Fang N, Lin L, Ren J, Wu D. A Method for Detection of Point Mutation Combined by Mutagenically Separated PCR with High Performance Liquid Chromatography. Chromatographia 2005. [DOI: 10.1365/s10337-005-0572-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
|
28
|
Bertina RM, Poort SR, Vos HL, Rosendaal FR. The 46C-->T polymorphism in the factor XII gene (F12) and the risk of venous thrombosis. J Thromb Haemost 2005; 3:597-9. [PMID: 15748262 DOI: 10.1111/j.1538-7836.2005.01198.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
29
|
Abstract
Selection of the translational initiation site in most eukaryotic mRNAs appears to occur via a scanning mechanism which predicts that proximity to the 5' end plays a dominant role in identifying the start codon. This "position effect" is seen in cases where a mutation creates an AUG codon upstream from the normal start site and translation shifts to the upstream site. The position effect is evident also in cases where a silent internal AUG codon is activated upon being relocated closer to the 5' end. Two mechanisms for escaping the first-AUG rule--reinitiation and context-dependent leaky scanning--enable downstream AUG codons to be accessed in some mRNAs. Although these mechanisms are not new, many new examples of their use have emerged. Via these escape pathways, the scanning mechanism operates even in extreme cases, such as a plant virus mRNA in which translation initiates from three start sites over a distance of 900 nt. This depends on careful structural arrangements, however, which are rarely present in cellular mRNAs. Understanding the rules for initiation of translation enables understanding of human diseases in which the expression of a critical gene is reduced by mutations that add upstream AUG codons or change the context around the AUG(START) codon. The opposite problem occurs in the case of hereditary thrombocythemia: translational efficiency is increased by mutations that remove or restructure a small upstream open reading frame in thrombopoietin mRNA, and the resulting overproduction of the cytokine causes the disease. This and other examples support the idea that 5' leader sequences are sometimes structured deliberately in a way that constrains scanning in order to prevent harmful overproduction of potent regulatory proteins. The accumulated evidence reveals how the scanning mechanism dictates the pattern of transcription--forcing production of monocistronic mRNAs--and the pattern of translation of eukaryotic cellular and viral genes.
Collapse
Key Words
- translational control
- aug context
- 5′ untranslated region
- reinitiation
- leaky scanning
- dicistronic mrna
- internal ribosome entry site
- adometdc, s-adenosylmethionine decarboxylase
- a2ar, a2a adenosine receptor
- c/ebp, ccaat/enhancer binding protein
- ctl, cytotoxic t-lymphocyte
- egfp, enhanced green fluorescent protein
- eif, eukaryotic initiation factor
- hiv-1, human immunodeficiency virus 1
- ires, internal ribosome entry site
- lef1, lymphoid enhancer factor-1
- ogp, osteogenic growth peptide
- orf, open reading frame
- r, purine
- tpo, thrombopoietin
- uporf, upstream open reading frame
- utr, untranslated region
Collapse
Affiliation(s)
- Marilyn Kozak
- Department of Biochemistry, Robert Wood Johnson Medical School, University of Medicine and Dentistry of New Jersey, 675 Hoes Lane, Piscataway, NJ 08854, USA.
| |
Collapse
|
30
|
Endler G, Klimesch A, Sunder-Plassmann H, Schillinger M, Exner M, Mannhalter C, Jordanova N, Christ G, Thalhammer R, Huber K, Sunder-Plassmann R. Mean platelet volume is an independent risk factor for myocardial infarction but not for coronary artery disease. Br J Haematol 2002; 117:399-404. [PMID: 11972524 DOI: 10.1046/j.1365-2141.2002.03441.x] [Citation(s) in RCA: 315] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
After rupture of an arteriosclerotic plaque in a coronary artery, platelets play a crucial role in the subsequent thrombus formation, leading to myocardial infarction. An increased mean platelet volume (MPV), as an indicator of larger, more reactive platelets, may represent a risk factor for myocardial infarction. However, this hypothesis is still controversial and most studies addressing the role of MPV were performed comparing patients suffering from myocardial infarction with healthy controls. We intended to identify patients at high risk of suffering myocardial infarction in a group of patients with known coronary artery disease. One hundred and eighty-five consecutive patients with stable coronary artery disease were compared with 188 individuals who had suffered myocardial infarction. Patients within the highest quintile of MPV (> or = 11.6 fl) had a significantly higher risk of experiencing a myocardial infarction compared with patients within the lowest quintile (OR = 2.6, 95% CI 1.3-5.1) in a multivariate analysis that included sex, age, body mass index, hyperlipidaemia, hypertension, smoking and diabetes mellitus. Our results indicate that patients with pre-existing coronary artery disease and an increased MPV (> or = 11.6 fl) are at higher risk of myocardial infarction. These patients can be easily identified during routine haematological analysis and could possibly benefit from preventive treatment.
Collapse
Affiliation(s)
- Georg Endler
- Department of Laboratory Medicine, Division of Molecular Biology, University of Vienna Medical School, AKH-Wien Währinger Gürtel 18-20, 1090 Vienna, Austria
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
31
|
Endler G, Mannhalter C, Sunder-Plassmann H, Lalouschek W, Kapiotis S, Exner M, Jordanova N, Meier S, Kunze F, Wagner O, Huber K. Homozygosity for the C-->T polymorphism at nucleotide 46 in the 5' untranslated region of the factor XII gene protects from development of acute coronary syndrome. Br J Haematol 2001; 115:1007-9. [PMID: 11843842 DOI: 10.1046/j.1365-2141.2001.03201.x] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Recently, a C-->T polymorphism at nucleotide 46 in the 5'-untranslated region of the factor XII (FXII) gene was shown to be associated with lower levels of FXII. To study the impact of this polymorphism on the development of an acute coronary syndrome (ACS), we compared 303 patients with ACS and 227 patients with stable coronary artery disease (CAD). In the latter group, 54.2% of individuals carried wild-type FXII:46C, 37.9% were heterozygous FXII:C46T and 7.9% were homozygous for FXII:46T. In contrast, in the ACS group (n = 303), 54.1% were wild-type FXII:46C, 42.6% were heterozygous FXII:C46T and only 3.3% carried the homozygous FXII:46T genotype. The 2.5-fold lower prevalence of the FXII:46T genotype in patients with ACS could indicate a protective effect on the development of ACS (odds ratio = 0.4, 95% CI 0.1-0.9) in patients with pre-existing CAD.
Collapse
Affiliation(s)
- G Endler
- Department of Laboratory Medicine, University of Vienna Medical School, AKH-Wien Währinger Gürtel 18-20, 1090 Vienna, Austria
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|