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Khalaf FA, Ibrahim HR, Bedair HM, Allam MM, Elshormilisy AA, Ali ST, Gaber WM. Plasminogen activator inhibitor-1 gene polymorphism as a risk factor for vascular complications in type 2 diabetes mellitus. EGYPTIAN JOURNAL OF MEDICAL HUMAN GENETICS 2019. [DOI: 10.1186/s43042-019-0018-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Abstract
Background
Diabetes mellitus (DM) can lead to microvascular and macrovascular damages through hyperglycemia that is the main cause of diabetic complications. Other factors such as hypertension, obesity, and hyperlipidemia may worsen or accelerate the others. Several studies have revealed definitive genetic predispositions to the development of type 2 diabetes mellitus (T2DM) and development of vascular complications. This study aimed to address the association between plasminogen activator inhibitor-1 (PAI-1) gene polymorphism and T2DM, and if this gene polymorphism may have a possible role in the development of vascular complications in T2DM. This study is a case control; it included 200 patients with T2DM, 117 patients had no vascular complications, and 83 had previous vascular complications (VCs). One hundred eighty volunteer blood donors were selected as a healthy control group. All patients and controls were subjected to clinical examination, and laboratory investigations included lipid profile, fasting and 2 h blood glucose, complete blood cell count, d-dimer, PAI-1, thrombin activatable fibrinolysis inhibitor (TAFI), and detection of PAI-1 gene polymorphism by real-time polymerase chain reaction (PCR).
Results
The most prevalent genotype of PAI-1 gene polymorphism in all studied groups, including controls, was 4G/5G with the highest allele frequency as 4G. The 4G/5G and 4G/4G genotypes were associated with increased risk of DM development as compared to 5G/5G genotype. The 4G/5G and 4G/4G genotypes also had a highly significant increased risk of VCs among diabetic patients, as compared to 5G/5G. The 4G allele also was highly associated with DM with VCs. The d-dimer TAFI, PAI-1 showed the highest levels in 4G/5G genotype followed by 4G/4G genotype. The lowest level was expressed in 5G/5G genotype in diabetic patients with and without VCs. The univariable analysis showed that genotypes 4G/5G and 4G/4G were potentially risk factors for development of VCs with T2DM patients.
Conclusion
This study concludes that the PAI-1 4G/5G polymorphism may be associated with T2DM and may be considered as a risk factor for development of thrombotic events. It may also help in selection and dosing of patients being treated with anticoagulant and fibrinolytic agents. Further large-scale studies are recommended to assess the possible role of environmental factors and gene interactions in the development of T2DM vascular risks.
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Glotov AS, Sinitsyna ES, Danilova MM, Vashukova ES, Walter JG, Stahl F, Baranov VS, Vlakh EG, Tennikova TB. Detection of human genome mutations associated with pregnancy complications using 3-D microarray based on macroporous polymer monoliths. Talanta 2015; 147:537-46. [PMID: 26592644 DOI: 10.1016/j.talanta.2015.09.066] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2015] [Revised: 09/21/2015] [Accepted: 09/27/2015] [Indexed: 01/13/2023]
Abstract
Analysis of variations in DNA structure using a low-density microarray technology for routine diagnostic in evidence-based medicine is still relevant. In this work the applicability of 3-D macroporous monolithic methacrylate-based platforms for detection of different pathogenic genomic substitutions was studied. The detection of nucleotide replacements in F5 (Leiden G/A, rs6025), MTHFR (C/T, rs1801133) and ITGB3 (T/C, rs5918), involved in coagulation, and COMT (C/G, rs4818), TPH2 (T/A, rs11178997), PON1 (T/A rs854560), AGTR2 (C/A, rs11091046) and SERPINE1 (5G/4G, rs1799889), associated with pregnancy complications, was performed. The effect of such parameters as amount and type of oligonucleotide probe, amount of PCR product on signal-to-noise ratio, as well as mismatch discrimination was analyzed. Sensitivity and specificity of mutation detections were coincided and equal to 98.6%. The analysis of SERPINE1 and MTHFR genotypes by both NGS and developed microarray was performed and compared.
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Affiliation(s)
- A S Glotov
- Faculty of Biology, Saint-Petersburg State University, St. Petersburg, Russia; D.O. Ott Research Institute of Obstetrics and Gynecology, Russian Academy of Medical Sciences, St. Petersburg, Russia
| | - E S Sinitsyna
- Institute of Chemistry, Saint-Petersburg State University, St. Petersburg, Russia; Institute of Macromolecular Compound, Russian Academy of Sciences, St. Petersburg, Russia
| | - M M Danilova
- D.O. Ott Research Institute of Obstetrics and Gynecology, Russian Academy of Medical Sciences, St. Petersburg, Russia
| | - E S Vashukova
- D.O. Ott Research Institute of Obstetrics and Gynecology, Russian Academy of Medical Sciences, St. Petersburg, Russia
| | - J G Walter
- Institute for Technical Chemistry, Leibniz University, Hannover, Germany
| | - F Stahl
- Institute for Technical Chemistry, Leibniz University, Hannover, Germany
| | - V S Baranov
- Faculty of Biology, Saint-Petersburg State University, St. Petersburg, Russia; D.O. Ott Research Institute of Obstetrics and Gynecology, Russian Academy of Medical Sciences, St. Petersburg, Russia
| | - E G Vlakh
- Institute of Chemistry, Saint-Petersburg State University, St. Petersburg, Russia; Institute of Macromolecular Compound, Russian Academy of Sciences, St. Petersburg, Russia
| | - T B Tennikova
- Institute of Chemistry, Saint-Petersburg State University, St. Petersburg, Russia; Institute of Macromolecular Compound, Russian Academy of Sciences, St. Petersburg, Russia.
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3
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4G/5G polymorphism modulates PAI-1 circulating levels in obese women. Mol Cell Biochem 2012; 364:299-301. [DOI: 10.1007/s11010-012-1230-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2011] [Accepted: 01/04/2012] [Indexed: 02/06/2023]
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Study of 18 functional hemostatic polymorphisms in mucocutaneous bleeding disorders. Ann Hematol 2010; 89:1147-54. [PMID: 20532885 DOI: 10.1007/s00277-010-1000-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2010] [Accepted: 05/17/2010] [Indexed: 10/19/2022]
Abstract
Hereditary disorders of primary hemostasis, characterized by mucocutaneous bleeding (MCB), are highly prevalent in children. Few cases are clearly monogenic, but the overwhelming majority are classified as mild bleeding disorders, with wide clinical and laboratory heterogeneity suggestive of complex polygenic diseases. In this framework, and by homology with venous thrombosis, some functional polymorphisms affecting the hemostatic system should be considered. We evaluated the role of 18 common hemostatic polymorphisms on the occurrence and severity of MCB in a case-control study including 269 patients and 286 matched controls consecutively recruited. FV Leiden was associated with milder bleeding severity, assessed by a standardized bleeding score (p = 0.013). Multivariate analysis revealed that three additional polymorphisms protected against MCB (F13 Leu34, OR = 0.66; 95% CI, 0.47-0.94; p = 0.024; VKORC1 1173T, OR = 0.59; 95% CI, 0.40-0.87; p = 0.009; and non-O blood group alleles, OR = 0.59; 95% CI, 0.41-0.86; p = 0.006). When combined, these polymorphisms showed an additive protection (OR = 0.24; 95% CI, 0.11-0.52), supporting the polygenic nature of MCB. Our data suggest that some common polymorphisms affecting hemostasis-related genes could protect from bleeding.
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Armangil D, Yurdakök M, Okur H, Gürgey A. Plasminogen Activator Inhibitor I 4G/5G Polymorphism in Neonatal Respiratory Distress Syndrome. Clin Appl Thromb Hemost 2010; 17:352-7. [DOI: 10.1177/1076029610369796] [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] Open
Abstract
Fibrin monomers inhibit surfactant function. 4G/5G insertion/deletion polymorphism plays an important role in the regulation of plasminogen activator inhibitor 1 (PAI-1) gene expression. To examine the genotype distribution of PAI-1 polymorphism in 60 infants with respiratory distress syndrome (RDS) and 53 controls, an allele-specific polymerase chain reaction (PCR) was used. The proportion of 4G/4G, 4G/5G, and 5G/5G genotypes did not differ statistically between the RDS and control groups (P > .05). Having PAI-1 4G/4G genotype polymorphism appears to increase the risk of RDS (odds ratio [OR] =1.5; 95% confidence interval [CI], 0.5-4.3), although it was not statistically significant. No relation was found between the PAI-1 4G/5G polymorphisms and RDS, but there was an increased risk associated with the 4G variant of the PAI-1 gene. We believe that our findings of increased 4G allele of the PAI-1 gene in infants with RDS would also help to clarify the pathogenesis of RDS.
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Affiliation(s)
- Didem Armangil
- Department of Pediatrics, Neonatology Unit, Faculty of Medicine, Hacettepe University, Ankara, Turkey,
| | - Murat Yurdakök
- Department of Pediatrics, Neonatology Unit, Faculty of Medicine, Hacettepe University, Ankara, Turkey
| | - Hamza Okur
- Department of Pediatrics, Hematology Unit, Faculty of Medicine, Hacettepe University, Ankara Turkey
| | - Aytemiz Gürgey
- Department of Pediatrics, Hematology Unit, Faculty of Medicine, Hacettepe University, Ankara Turkey
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Amicarelli G, Shehi E, Makrigiorgos GM, Adlerstein D. FLAG assay as a novel method for real-time signal generation during PCR: application to detection and genotyping of KRAS codon 12 mutations. Nucleic Acids Res 2007; 35:e131. [PMID: 17932053 PMCID: PMC2095824 DOI: 10.1093/nar/gkm809] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
Real-time signal generation methods for detection and characterization of low-abundance mutations in genomic DNA are powerful tools for cancer diagnosis and prognosis. Mutations in codon 12 of the oncogene KRAS, for example, are frequently found in several types of human cancers. We have developed a novel real-time PCR technology, FLAG (FLuorescent Amplicon Generation) and adapted it for simultaneously (i) amplifying mutated codon 12 KRAS sequences, (ii) monitoring in real-time the amplification and (iii) genotyping the exact nucleotide alteration. FLAG utilizes the exceptionally thermostable endonuclease PspGI for real-time signal generation by cleavage of quenched fluorophores from the 5′-end of the PCR products and, concurrently, for selecting KRAS mutations over wild type. By including peptide-nucleic-acid probes in the reaction, simultaneous genotyping is achieved that circumvents the requirement for sequencing. FLAG enables high-throughput, closed-tube KRAS mutation detection down to ∼0.1% mutant-to-wild type. The assay was validated on model systems and compared with allele-specific PCR sequencing for screening 27 cancer specimens. Diverse applications of FLAG for real-time PCR or genotyping applications in cancer, virology or infectious diseases are envisioned.
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7
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Genotype combinations of plasminogen activator inhibitor-1 and angiotensin-converting enzyme genes and risk for early onset of coronary heart disease. ACTA ACUST UNITED AC 2006. [DOI: 10.1097/00149831-200606000-00023] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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8
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Torfs CP, Christianson RE, Iovannisci DM, Shaw GM, Lammer EJ. Selected gene polymorphisms and their interaction with maternal smoking, as risk factors for gastroschisis. ACTA ACUST UNITED AC 2006; 76:723-30. [PMID: 17051589 DOI: 10.1002/bdra.20310] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
BACKGROUND Gastroschisis is a severe birth defect in which the infant is born with a portion of the intestines extruding through a small tear in the abdominal wall, usually to the right of the umbilical cord. Its etiology is unknown, but the prevailing hypothesis is that it results from a vascular accident at the time of involution of the right umbilical vein or of the development of the superior mesenteric artery. METHODS In a case-control study of 57 cases of gastroschisis and 506 controls, we tested DNA for polymorphisms of 32 genes representing enzymes involved in angiogenesis, blood vessel integrity, inflammation, wound repair, and dermal or epidermal strength. RESULTS In logistic regression, controlling for maternal ethnicity, and using the homozygote wild-type as referent, the following gene polymorphisms were associated with an increased risk for a gastroschisis for heterozygotes: ICAM1 gly241arg (odds ratio [OR], 1.9; 95% confidence interval [CI], 1.1 -3.4); NOS3 glu298asp (OR, 1.9; 95% CI, 1.1-3.4); NPPA 2238T > C (OR, 1.9; 95% CI, 1.0-3.4); and ADD1 gly460trp (OR, 1.5; 95% CI, 0.8-2.8). Additionally, for the NPPA and ADD1 single-nucleotide polymorphisms (SNPs), the homozygote variants had a significantly higher risk than the heterozygotes (OR, 7.5; 95% CI, 1.7-33.5 and OR, 4.9; 95% CI, 1.9-12.9, respectively). Three SNPs showed a strong interaction with maternal smoking. The risk for smokers with 1 or 2 variant alleles compared to nonsmokers with the wild-type allele were: NOS3 (OR, 5.2; 95% CI, 2.4-11.4); ICAM1 (OR, 5.2; 95% CI, 2.1-12.7); and NPPA (OR, 6.4; 95% CI, 2.8-14.6). CONCLUSIONS These results support the hypothesis of a vascular compromise as part of a multifactorial etiology of gastroschisis involving both genes and environmental factors.
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Zhang DT, Hu LH, Yang YZ. Detection of three common G6PD gene mutations in Chinese individuals by probe melting curves. Clin Biochem 2005; 38:390-4. [PMID: 15766741 DOI: 10.1016/j.clinbiochem.2005.01.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2004] [Revised: 12/25/2004] [Accepted: 01/04/2005] [Indexed: 11/27/2022]
Abstract
OBJECTIVE In order to develop and validate an assay for rapid detection of three common G6PD gene mutations in Chinese individuals. METHODS In this report we design two sets of primers and fluorescently labeled hybridization probes recognizing adjacent sequences in the amplicon; after annealing, the fluorophores were in resonance energy transfer, providing real-time monitoring of the amplication process. At the completion of PCR, fluorescence was monitored as the temperature increased through the Tm of the probe/product duplex, and a characteristic melting profile for each mutation was obtained. By using the fluorescence method and PCR/RE, a total of 57 samples obtained from two groups of G6PD-deficient individuals were studied. RESULT A rapid method for detection of three common G6PD gene mutations in Chinese individuals by probe melting curves was developed. This method shows 100% accordance with the traditional method. CONCLUSION This fluorescent melting curve analysis is a simple, rapid, and effective method for clinical diagnosis and screening of G6PD deficiency.
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Affiliation(s)
- De-Tai Zhang
- Department of Laboratory Diagnosis, Union Hospital, Tong-ji Medical College, Hua-Zhong Science and Technology University, 1277# Jiefang Dadao, Wuhan 430022, PR China.
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10
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Gerhardt A, Goecke TW, Beckmann MW, Wagner KJ, Tutschek B, Willers R, Bender HG, Scharf RE, Zotz RB. The G20210A prothrombin-gene mutation and the plasminogen activator inhibitor (PAI-1) 5G/5G genotype are associated with early onset of severe preeclampsia. J Thromb Haemost 2005; 3:686-91. [PMID: 15842353 DOI: 10.1111/j.1538-7836.2005.01226.x] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Hereditary risk determinants of venous thrombosis have been reported to be associated with severe preeclampsia. So far there are no data to support whether these risk determinants are related to the time of onset of severe preeclampsia. We used a case-control design, studying 97 women with severe preeclampsia in previous pregnancies and 277 normal women, to assess hereditary risk factors of venous thrombosis as risk determinants for severe preeclampsia. A case-only design comprising solely the 97 women with a history of preeclampsia was used to evaluate these risk factors as risk determinants for early onset of severe preeclampsia. Using the case-control design, there was no significant risk association of the hereditary risk factors with severe preeclampsia [factor V Leiden, odds ratio (OR) 0.9, 95% confidence interval (CI) 0.4, 2.2; prothrombin mutation, OR 1.9, 95% CI 0.5, 7.0; methylentetrahydrofolate reductase 677TT genotype, OR 0.8, 95% CI 0.4, 1.8; plasminogen activator inhibitor (PAI-1) 4G/4G genotype, OR 1.2, 95% CI 0.7, 2.1; PAI-1 5G/5G genotype, OR 1.0, 95% CI 0.5, 1.8]. However, the onset of severe preeclampsia was significantly earlier in women with the G20210A prothrombin gene mutation (24.5 weeks vs. 30.1 weeks, P = 0.046) and in women with the PAI-1 5G/5G genotype (25.7 weeks vs. 30.8 weeks, P = 0.024). Hereditary risk factors for venous thrombosis do not predispose for severe preeclampsia. However, women who are carriers of the G20210A prothrombin gene mutation and the PAI-1 5G/5G genotype are at risk for early onset of severe preeclampsia. It appears that these risk factors do not induce the pathomechanism but accelerate the course of preeclampsia.
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Affiliation(s)
- A Gerhardt
- Department of Obstetrics and Gynecology, Heinrich Heine University Medical Center, Dusseldorf, Germany
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11
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Petersen K, Vogel U, Rockenbauer E, Nielsen KV, Kølvraa S, Bolund L, Nexø B. Short PNA molecular beacons for real-time PCR allelic discrimination of single nucleotide polymorphisms. Mol Cell Probes 2004; 18:117-22. [PMID: 15051121 DOI: 10.1016/j.mcp.2003.10.003] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2003] [Accepted: 10/24/2003] [Indexed: 11/28/2022]
Abstract
The typing of a single nucleotide polymorphism with DNA probes is sometimes problematic because of the limited discriminating power of long DNA probes. As an alternative to existing assays, we have developed a real-time PCR assay for the genotyping of single nucleotide polymorphisms using short peptide nucleic acid (PNA) molecular beacons. A single nucleotide polymorphism in exon 6 of the XPD gene was chosen as the model system. The genotyping experiments were performed in the ABI 7700 using beacons labeled with either fluorescein or JOE, and in the Lightcycler using a fluorescein labeled beacon. QSY-7 was used as the quencher in all the beacons. The result of the genotyping was the same on both instruments and was in agreement with a previously performed RFLP genotyping of 79 samples. The length of PNA molecular beacons is significantly shorter than that of TaqMan or Lightcycler probes, making probe design and genotype discrimination easier.
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Affiliation(s)
- Kenneth Petersen
- DakoCytomation A/S, Produktionsvej 42, DK-2600 Glostrup, Denmark
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12
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Hoppe B, Heymann GA, Koscielny J, Hellstern P, Kiesewetter H, Salama A. Screening for multiple hereditary hypercoagulability factors using the amplification refractory mutation system. Thromb Res 2004; 111:115-20. [PMID: 14644089 DOI: 10.1016/j.thromres.2003.08.024] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Many hereditary factors have been implicated in the development of arterial and/or venous thromboembolic diseases. A number of these risk factors can be identified by the amplification refractory mutation system (ARMS). However, the underlying technical conditions for performing ARMS are highly variable, and depend on which risk factors are being analyzed. We have now developed a novel ARMS-based system to simultaneously screen for multiple hypercoagulability factors under identical PCR conditions. This can greatly simplify the process of screening for hereditary hypercoagulability.
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Affiliation(s)
- Berthold Hoppe
- Institute of Transfusion Medicine, Charité-Universitätsmedizin Berlin Campus Virchow-Klinikum, Humboldt-Universität Berlin, Augustenburger Platz 1, 13353 Berlin, Germany.
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Olman MA, White KE, Ware LB, Simmons WL, Benveniste EN, Zhu S, Pugin J, Matthay MA. Pulmonary edema fluid from patients with early lung injury stimulates fibroblast proliferation through IL-1 beta-induced IL-6 expression. THE JOURNAL OF IMMUNOLOGY 2004; 172:2668-77. [PMID: 14764742 DOI: 10.4049/jimmunol.172.4.2668] [Citation(s) in RCA: 99] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Although the fibroproliferative response to lung injury occurs with a high frequency in patients with clinical acute lung injury, the mechanisms that initiate this response are largely unknown. This study was undertaken first to identify fibroblast mitogenic factors in pulmonary edema fluid, and second to examine the human lung fibroblast's gene expression profile in response to pulmonary edema fluid. The edema fluid obtained from patients with early lung injury has an eightfold higher concentration of IL-1beta and a twofold greater IL-1beta-dependent mitogenic effect than does fluid obtained from control patients with hydrostatic pulmonary edema. Furthermore, fibroblasts responded to acute lung injury patient-derived edema fluid through production of soluble mediators that possess an autocrine mitogenic effect. Gene array analysis reveals that acute lung injury edema fluid induces several inflammation-modulating and proliferation-related genes in fibroblasts, whose inductions are similarly dependent on bioactive IL-1beta. Most notably, the 20-fold induction of IL-6 mRNA and protein was completely blocked by IL-1 receptor antagonist. The combined addition of IL-1beta and IL-6 was mitogenic, and the proliferative response to conditioned medium from IL-1beta-exposed cells was blocked by antagonistically acting Abs to IL-6 or to gp130. These novel findings indicate that soluble IL-1beta bioactivity and autocrine IL-1beta-dependent IL-6 up-regulation are critical initiators of fibroblast activation and proliferation and that they likely play a role in the fibroproliferative response seen in human acute lung injury.
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Affiliation(s)
- Mitchell A Olman
- Department of Medicine, University of Alabama, Birmingham AL 35294, USA.
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14
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Ruiz A, Antiñolo G, Marcos I, Borrego S. Novel Technique for Scanning of Codon 634 of the RET Protooncogene with Fluorescence Resonance Energy Transfer and Real-Time PCR in Patients with Medullary Thyroid Carcinoma. Clin Chem 2001. [DOI: 10.1093/clinchem/47.11.1939] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Abstract
Background: The multiple endocrine neoplasia 2 (MEN 2) syndromes [MEN 2A, MEN 2B, and familial medullary thyroid carcinoma (FMTC)] are caused by germline mutations of the RET protooncogene. Because 85% of MEN 2A patients and 30% of FMTC patients have mutations at codon 634, the recommended molecular analyses begin at exon 11, where codon 634 is located.
Methods: We scanned codon 634 of the RET protooncogene with real-time PCR and fluorescence resonance energy transfer (FRET), using a unique pair of internal probes to detect mutations localized at codon 634. We compared results with sequencing results in 66 patients.
Results: The method detected all codon 634 mutations available in our laboratory (Cys634Tyr, Cys634Arg, Cys634Phe, Cys634Trp). Comparing this method with the direct sequencing of exon 11 in a cohort of 66 patients with MTC, the system identified all 14 MTC patients carrying germline mutations at codon 634. One apparent false-positive result occurred among 52 patients.
Conclusions: The simultaneous scanning of multiple mutations is possible with the FRET system. The method allows rapid characterization of germline mutations at codon 634 in MTC patients.
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Affiliation(s)
| | | | | | - Salud Borrego
- Unidad de Genética Médica y Diagnóstico Prenatal Hospitales Universitarios Virgen del Rocío, 41013-Seville, Spain
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15
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Somogyvári F, Szolnoki Z, Márki-Zay J, Fodor L. Real-Time PCR Assay with Fluorescent Hybridization Probes for Exact and Rapid Genotyping of the Angiotensin-converting Enzyme Gene Insertion/Deletion Polymorphism. Clin Chem 2001. [DOI: 10.1093/clinchem/47.9.1728] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
| | - Zoltán Szolnoki
- Department of Neurology and Neurophysiology, Pándy Kálmán County Hospital, H-5700 Gyula, Semmelweis 1, Hungary
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16
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Funato T, Nishiyama Y, Ioritani N, Matsuki R, Yoshida K, Kaku M, Sasaki T, Ideguchi H, Ono J. Detection of mutations in adenine phosphoribosyltransferase (APRT) deficiency using the LightCycler system. J Clin Lab Anal 2001; 14:274-9. [PMID: 11138609 PMCID: PMC6808163 DOI: 10.1002/1098-2825(20001212)14:6<274::aid-jcla5>3.0.co;2-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
We have applied an established technique, the polymerase chain reaction (PCR) with LightCycler technology, to a single disease with well-defined mutations. This assay produces results within only 30 min by combining PCR and fluorescence detection in one tube without electrophoretic band detection. In this study, we found 2,8-dihydroxyadenine (DHA) lithiasis in Japanese patients who were heterozygous for Japanese-type (type II) adenine phosphoribosyltransferase (APRT) deficiency (APRT*J). These patients, from a family with 2,8-DHA lithiasis, had a heterozygous mutation in the J region of the APRT gene. We demonstrated that the present system, using LightCycler technology, was simple, rapid, and reliable for detecting known mutations, and capable of identifying heterozygous and homozygous mutations in this family with APRT deficiency.
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Affiliation(s)
- T Funato
- Department of Molecular Diagnostics, Tohoku University, School of Medicine, Sendai, Japan.
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17
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Myakishev MV, Khripin Y, Hu S, Hamer DH. High-throughput SNP genotyping by allele-specific PCR with universal energy-transfer-labeled primers. Genome Res 2001; 11:163-9. [PMID: 11156625 PMCID: PMC311033 DOI: 10.1101/gr.157901] [Citation(s) in RCA: 216] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
We have developed a new method for high-throughput genotyping of single nucleotide polymorphisms (SNPs). The technique involves PCR amplification of genomic DNA with two tailed allele-specific primers that introduce priming sites for universal energy-transfer-labeled primers. The output of red and green light is conveniently scored using a fluorescence plate reader. The new method, which was validated on nine model SNPs, is well suited for high-throughput, automated genotyping because it requires only one reaction per SNP, it is performed in a single tube with no post-PCR handling, the same energy-transfer-labeled primers are used for all analyses, and the instrumentation is inexpensive. Possible applications include multiple-candidate gene analysis, genomewide scans, and medical diagnostics.
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Affiliation(s)
- M V Myakishev
- Laboratory of Biochemistry, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892, USA.
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18
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von Ahsen N, Oellerich M, Schütz E. DNA Base Bulge vs Unmatched End Formation in Probe-based Diagnostic Insertion/Deletion Genotyping: Genotyping the UGT1A1 (TA)n Polymorphism by Real-Time Fluorescence PCR. Clin Chem 2000. [DOI: 10.1093/clinchem/46.12.1939] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Abstract
Background: Gilbert syndrome is a clinically inconsequential entity of mild unconjugated hyperbilirubinemia caused by an A(TA)nTAA insertion polymorphism (UGT1A1*28) in the promoter region of the gene coding for the enzyme UDP-glucuronosyltransferase 1 (EC 2.4.1.17; UGT1A1). Present methods for genotyping this polymorphism are laborious.
Methods: Hybridization probes were designed complementary to the wild type (TA)6 and to alleles with (TA)7 and (TA)8 repeats in the promoter region. Melting points were measured in samples representing all currently known alleles with (TA)5 to (TA)8 repeats. Probe melting points were predicted with a thermodynamic nearest-neighbor model for Watson-Crick paired probes. The dominant secondary structures resulting from probe hybridization were predicted by thermodynamic free energy calculations. Alternatively samples were genotyped based on amplicon size resolved by high-resolution polyacrylamide gel electrophoresis.
Results: Only short probes (22–24 bases) could be successfully used for genotyping this locus because of the very low stability of this TA repeat. Assays based on (TA)7 or (TA)8 genotype-compatible hybridization probes effectively discriminated five to eight TA repeats. The consecutive use of two different detection probes was necessary for better discrimination of some heterozygous genotypes. All results were in concordance with the alternative genotyping method. Of 100 investigated Caucasians (50 males, 50 females), 9 (9%) were homozygous for the (TA)7 allele.
Conclusions: The presented method for genotyping the (TA)n promoter polymorphism of the UGT1A1 gene with the LightCycler has the potential to genotype all currently known (TA)n repeats in a single assay and is sensitive toward possible new genotypes. Our findings also show that thermodynamic calculations are of practical value for the design of hybridization probe assays for the genotyping of insertion/deletion polymorphisms.
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Affiliation(s)
- Nicolas von Ahsen
- Department of Clinical Chemistry, Georg-August-University, Robert-Koch-Strasse 40, 37075 Goettingen, Germany
| | - Michael Oellerich
- Department of Clinical Chemistry, Georg-August-University, Robert-Koch-Strasse 40, 37075 Goettingen, Germany
| | - Ekkehard Schütz
- Department of Clinical Chemistry, Georg-August-University, Robert-Koch-Strasse 40, 37075 Goettingen, Germany
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Press RD. Detection of Prevalent Genetic Alterations Predisposing to Hemochromatosis and Other Common Human Diseases. Clin Chem 2000. [DOI: 10.1093/clinchem/46.10.1526] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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Nakao M, Janssen JW, Seriu T, Bartram CR. Rapid and reliable detection of N-ras mutations in acute lymphoblastic leukemia by melting curve analysis using LightCycler technology. Leukemia 2000; 14:312-5. [PMID: 10673750 DOI: 10.1038/sj.leu.2401645] [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: 11/08/2022]
Abstract
We applied a new strategy for the detection of N-ras gene mutations based on LightCycler technology. We designed two sets of amplimers and internal hybridization probes representing N-ras codons 12/13 and codon 61, respectively. Genomic DNAs from 134 childhood acute lymphoblastic leukemia (ALL) patients (83 common ALL, nine pre-pre-B ALL, 19 pre-B ALL, 23 T-ALL) were amplified, followed by the analysis of the melting temperatures of the PCR products on the LightCycler. PCR products exhibiting an abnormal melting characteristic were directly sequenced. Sequence analyses unravelled nucleotide substitutions at codon 12 in 10 patients, at codon 13 in three, and at codon 61 in one case. The incidence of N-rasmutations (10%) is compatible with previous reports. The LightCycler technology facilitates the rapid analysis of other genes exhibiting hot spot mutations in human malignancies.
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Affiliation(s)
- M Nakao
- Institute of Human Genetics, University of Heidelberg, Germany
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Bernard PS, Wittwer CT. Homogeneous Amplification and Variant Detection by Fluorescent Hybridization Probes. Clin Chem 2000. [DOI: 10.1093/clinchem/46.2.147] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Philip S Bernard
- Department of Pathology, University of Utah School of Medicine, 50 North Medical Dr., Salt Lake City, UT 84132
| | - Carl T Wittwer
- Department of Pathology, University of Utah School of Medicine, 50 North Medical Dr., Salt Lake City, UT 84132
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