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Bazalová O, Cihlář JZ, Dlouhá Z, Bár L, Dráb V, Kavková M. Rapid sourdough yeast identification using panfungal PCR combined with high resolution melting analysis. J Microbiol Methods 2022; 199:106522. [PMID: 35716843 DOI: 10.1016/j.mimet.2022.106522] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2022] [Revised: 06/10/2022] [Accepted: 06/10/2022] [Indexed: 10/18/2022]
Abstract
The microbial composition of the sourdough starter affects the sourdough bread properties. Therefore, it is crucial to find a tool for rapid, time-saving, and economical identification of the sourdough microbiota. We focused on the rapid identification of sourdough yeasts. We designed a panfungal real time-PCR targeting the ITS2 region (ITS-amplicon) and a fragment of D1/D2 region of 26S rRNA gene (U-amplicon) and used high resolution melting analysis (HRM) for subsequent species identification. The sensitivity and specificity of our method were tested on the reference yeast cultures. We obtained divergent melting peaks (Tm). The further analysis of melt curves suggests the possibility to discriminate yeasts on the genus- and some on species-specific level in the mixed sample. The applicability of this method in routine practice was evaluated on nine sourdough samples. Revealed melt curves of U-amplicons were predominantly characteristic of the sourdough. The evaluation of the Tm and the shape of the melt curve was used to assess the sourdough yeasts. Additionally, using the HRM-PCR method the contamination with the ergot fungus DNA was revealed. Our data showed HRM-PCR is a simple, rapid, and inexpensive tool useful in identifying sourdough yeasts.
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Affiliation(s)
- Olga Bazalová
- Dairy Research Institute, Ltd., Department Tábor, Ke Dvoru 12a, 160 00 Praha, Vokovice, Czech Republic.
| | - Jaromír Z Cihlář
- Dairy Research Institute, Ltd., Department Tábor, Ke Dvoru 12a, 160 00 Praha, Vokovice, Czech Republic; Milcom, a.s., Collection of Dairy Microorganisms - Laktoflora, Ke Dvoru 12a, 160 00 Praha, Vokovice, Czech Republic
| | - Zuzana Dlouhá
- Milcom, a.s., Collection of Dairy Microorganisms - Laktoflora, Ke Dvoru 12a, 160 00 Praha, Vokovice, Czech Republic
| | - Ladislav Bár
- Dairy Research Institute, Ltd., Department Tábor, Ke Dvoru 12a, 160 00 Praha, Vokovice, Czech Republic; Milcom, a.s., Collection of Dairy Microorganisms - Laktoflora, Ke Dvoru 12a, 160 00 Praha, Vokovice, Czech Republic
| | - Vladimír Dráb
- Dairy Research Institute, Ltd., Department Tábor, Ke Dvoru 12a, 160 00 Praha, Vokovice, Czech Republic; Milcom, a.s., Collection of Dairy Microorganisms - Laktoflora, Ke Dvoru 12a, 160 00 Praha, Vokovice, Czech Republic
| | - Miloslava Kavková
- Dairy Research Institute, Ltd., Department Tábor, Ke Dvoru 12a, 160 00 Praha, Vokovice, Czech Republic; Milcom, a.s., Collection of Dairy Microorganisms - Laktoflora, Ke Dvoru 12a, 160 00 Praha, Vokovice, Czech Republic
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Asfaram S, Fakhar M, Mohebali M, Ziaei Hezarjaribi H, Mardani A, Ghezelbash B, Akhoundi B, Zarei Z, Moazeni M. A Convenient and Sensitive kDNA-PCR for Screening of Leishmania infantum Latent Infection Among Blood Donors in a Highly Endemic Focus, Northwestern Iran. Acta Parasitol 2022; 67:842-850. [PMID: 35294973 DOI: 10.1007/s11686-022-00528-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Accepted: 02/21/2022] [Indexed: 01/13/2023]
Abstract
BACKGROUND Recent global evidences showed that asymptomatic blood donor carriers of Leishmania infection will appear as a threat for blood transfusions recipients in endemic areas. As yet, there is no appropriate diagnostic procedure for detecting infection of blood donors in blood banks. SUBJECTS AND METHODS The present study was aimed to apply various current diagnostic tests among blood donors in an endemic area of visceral leishmaniasis (VL), Ardabil Province, northwestern Iran. Blood samples were gathered from 860 blood donors in endemic areas of the province between 2017 and 2018, at eight blood donation centers. These samples was assessed using microculture, serological (DAT and rK39-ICT) and molecular based (conventional kDNA-PCR and HRM-PCR) tests. RESULTS Of 860 eligible donors, 24 (2.8%) were seropositive for VL by DAT, and 388 (45%) were positive by kDNA-PCR. Moreover, 19 (19/860) were positive for both of them. Out of 19 subjects, 5.3% (1/19) was positive by rK39-ICT, 10.5% (2/19), and 79% (15/19) were detected positive in microculture and HRM-PCR methods, respectively. Nineteen donors were followed up for 2 years, of which 16 (84.2%) had a serological conversion, and 4 (21%) were positive by kDNA-PCR. The sensitivity of kDNA-PCR, and HRM-PCR procedures in detecting Leishmania parasite was found to be 98.7%, and 79%, respectively. CONCLUSIONS Our findings justify the use of kDNA-PCR as a convenient and sensitive tool for screening subjects with leishmanial latent infection in blood banks at least in endemic regions. In these areas, however, a PCR-based test should be used to validate Leishmania infection among seropositive donors.
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Affiliation(s)
- Shabnam Asfaram
- Zoonoses Research Center (ZRC), Ardabil University of Medical Sciences, Ardabil, Iran
- Toxoplasmosis Research Center, Communicable Diseases Institute, Iranian National Registry Center for Lophomoniasis and Toxoplasmosis, Mazandaran University of Medical Sciences, P.O Box: 48471-91971, Farah-Abad Road, Sari, Iran
| | - Mahdi Fakhar
- Toxoplasmosis Research Center, Communicable Diseases Institute, Iranian National Registry Center for Lophomoniasis and Toxoplasmosis, Mazandaran University of Medical Sciences, P.O Box: 48471-91971, Farah-Abad Road, Sari, Iran.
| | - Mehdi Mohebali
- Center for Research of Endemic Parasites of Iran (CREPI), Department of Parasitology, Tehran University of Medical Sciences, Tehran, Iran.
| | - Hajar Ziaei Hezarjaribi
- Toxoplasmosis Research Center, Communicable Diseases Institute, Iranian National Registry Center for Lophomoniasis and Toxoplasmosis, Mazandaran University of Medical Sciences, P.O Box: 48471-91971, Farah-Abad Road, Sari, Iran
| | - Ahmad Mardani
- Department of Microbiology, Blood Transfusion Research Center, High Institute for Research and Education in Transfusion Medicine, Tehran, Iran
| | - Behrooz Ghezelbash
- Laboratory Hematology and Blood Bank, Blood Transfusion Research Center, High Institute for Research and Education in Transfusion Medicine, Tehran, Iran
| | - Behnaz Akhoundi
- Center for Research of Endemic Parasites of Iran (CREPI), Department of Parasitology, Tehran University of Medical Sciences, Tehran, Iran
| | - Zabihollah Zarei
- Center for Research of Endemic Parasites of Iran (CREPI), Department of Parasitology, Tehran University of Medical Sciences, Tehran, Iran
| | - Maryam Moazeni
- Invasive Fungi Research Center, Communicable Diseases Institute, Department of Medical Mycology, School of Medicine, Mazandaran University of Medical Sciences, Sari, Iran
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Girault G, Perrot L, Mick V, Ponsart C. High-Resolution Melting PCR as Rapid Genotyping Tool for Brucella Species. Microorganisms 2022; 10:336. [PMID: 35208791 DOI: 10.3390/microorganisms10020336] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Revised: 01/26/2022] [Accepted: 01/28/2022] [Indexed: 02/06/2023] Open
Abstract
Brucella sp. are the causative agents of brucellosis. One of the main characteristics of the Brucella genus concerns its very high genetic homogeneity. To date, classical bacteriology typing is still considered as the gold standard assay for direct diagnosis of Brucella. Molecular approaches are routinely used for the identification of Brucella at the genus level. However, genotyping is more complex, and to date, no method exists to quickly assign a strain into species and biovar levels, and new approaches are required. Next generation sequencing (NGS) opened a new era into the diagnosis of bacterial diseases. In this study, we designed a high-resolution melting (HRM) method for the rapid screening of DNA and direct assignment into one of the 12 species of the Brucella genus. This method is based on 17 relevant single nucleotide polymorphisms (SNPs), identified and selected from a whole genome SNP (wgSNP) analysis based on 988 genomes (complete and drafts). These markers were tested against the collection of the European Reference Laboratory (EU-RL) for brucellosis (1440 DNAs extracted from Brucella strains). The results confirmed the reliability of the panel of 17 SNP markers, allowing the differentiation of each species of Brucella together with biovars 1, 2, and 3 of B. suis and vaccine strain Rev1 (B. melitensis) within 3 h, which is a considerable gain of time for brucellosis diagnosis. Therefore, this genotyping tool provides a new and quick alternative for Brucella identification based on SNPs with the HRM-PCR assay.
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Razavinasab SZ, Sharifi I, Aflatoonian MR, Babaei Z, Mohammadi MA, Salarkia E, Sharifi F, Aghaei Afshar A, Bamorovat M. Expansion of urban cutaneous leishmaniasis into rural areas of southeastern Iran: Clinical, epidemiological and phylogenetic profiles explored using 7SL high resolution melting-PCR analysis. Transbound Emerg Dis 2019; 66:1602-1610. [PMID: 30912874 DOI: 10.1111/tbed.13186] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2018] [Revised: 01/20/2019] [Accepted: 03/01/2019] [Indexed: 11/29/2022]
Abstract
Cutaneous leishmaniasis (CL) has increased remarkably in Iran and has expanded into new areas. The present study aimed to assess the emerging CL outbreak in southeastern Iran using high resolution melting-polymerase chain reaction (HRM-PCR) and phylogenetic analysis using the 7SL RNA gene marker. A cross-sectional and analytical survey was conducted during a house-to-house census of 11,021 inhabitants in Narmashir County in southeastern Iran in 2016. The cases were detected by direct smear microscopic examination and sequencing and were characterized using the 7SL RNA gene. All age groups and sexes were equally affected. Most were single lesions (70.7%). The hands (55.2%) and face (37.9%) were the main sites of involvement. The disease was more common among illiterate persons. Sequencing and HRM-PCR revealed that Leishmania tropica (accession no. MH632168 Qale-Shahid) was the principal causative agent of anthroponotic CL (ACL) in new areas of expansion. This is the first emergence of ACL in rural areas of Narmashir County. Based on the molecular data, the causative parasite species confirmed to be L. tropica. Sequencing and phylogenetic analysis indicated that a single clone of the organism derived from a single source has spread into the affected villages. Construction of a main road, population movement and recent urbanization in the area are likely the major factors associated with the establishment of this new outbreak. This study was essential to enable the planning of effective therapeutic and prophylactic measures to control the disease.
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Affiliation(s)
| | - Iraj Sharifi
- Leishmaniasis Research Center, Kerman University of Medical Sciences, Kerman, Iran
| | - Mohammad Reza Aflatoonian
- Research Center of Tropical and Infectious Diseases, Kerman University of Medical Sciences, Kerman, Iran
| | - Zahra Babaei
- Leishmaniasis Research Center, Kerman University of Medical Sciences, Kerman, Iran.,Department of Parasitology, Kerman University of Medical Sciences, Kerman, Iran
| | - Mohammad Ali Mohammadi
- Research Center for Hydatid Disease in Iran, Kerman University of Medical Sciences, Kerman, Iran
| | - Ehsan Salarkia
- Leishmaniasis Research Center, Kerman University of Medical Sciences, Kerman, Iran
| | - Fatemeh Sharifi
- Pharmaceutics Research Center, Institute of Neuropharmacology, Kerman University of Medical Sciences, Kerman, Iran
| | - Abbas Aghaei Afshar
- Leishmaniasis Research Center, Kerman University of Medical Sciences, Kerman, Iran
| | - Mehdi Bamorovat
- Leishmaniasis Research Center, Kerman University of Medical Sciences, Kerman, Iran
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Larssen KW, Nor A, Bergh K. Rapid discrimination of Staphylococcus epidermidis genotypes in a routine clinical microbiological laboratory using single nucleotide polymorphisms in housekeeping genes. J Med Microbiol 2018; 67:169-182. [PMID: 29293080 DOI: 10.1099/jmm.0.000663] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
PURPOSE Staphylococcus epidermidis colonies often display several morphologies and antimicrobial susceptibility patterns when cultured from device-related infections, and may represent one or multiple genotypes. Genotyping may be helpful in the clinical interpretation, but is time consuming and expensive. We wanted to establish a method for rapid discrimination of S. epidermidis genotypes for use in a routine microbiology laboratory. METHODOLOGY A real-time PCR targeting eight discriminatory class I or II single-nucleotide polymorphisms (SNPs) in six of the seven housekeeping genes was constructed. Post PCR, high-resolution melt (HRM) analysis using EvaGreen as fluorophore discriminated amplicons based on their percentage GC content. RESULTS In silico, 42 representative sequence types (STs), including all major MLST group and subgroup founders, were separated into 23 different cluster profiles with a Simpson's index of diversity of 0.97. By HRM-PCR, 11 commonly encountered hospital and outbreak STs were separated into eight HRM patterns. CONCLUSION This method can rapidly establish whether S. epidermidis strains belong to different genotypes. It can be used in patients with S. epidermidis infections, as an aid in outbreak investigations and to select strains for investigation with more discriminatory methods, saving workload and costs. Results may be obtained the same day as culture results. Its strength lies mainly in indicating differences, as some STs may have the same melt profile. Changes in S. epidermidis epidemiology may warrant alterations in the inclusion of SNPs. We believe this method can reduce the threshold for performing genotyping analysis on an increasingly important nosocomial pathogen.
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Affiliation(s)
- Kjersti Wik Larssen
- Department of Medical Microbiology, St. Olavs Hospital, Trondheim University Hospital, Trondheim, Norway
| | - Anne Nor
- Department of Laboratory medicine, Children's and Women's health, Faculty of Medicine, Norwegian University of Science and Technology, Trondheim, Norway
| | - Kåre Bergh
- Department of Medical Microbiology, St. Olavs Hospital, Trondheim University Hospital, Trondheim, Norway
- Department of Laboratory medicine, Children's and Women's health, Faculty of Medicine, Norwegian University of Science and Technology, Trondheim, Norway
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Nicoś M, Krawczyk P, Powrózek T, Szudy P, Jarosz B, Sawicki M, Szumiło J, Trojanowski T, Milanowski J. PIK3CA Mutations Detected in Patients with Central Nervous System Metastases of Non-small Cell Lung Cancer. Anticancer Res 2016; 36:2243-2249. [PMID: 27127129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2016] [Accepted: 04/11/2016] [Indexed: 06/05/2023]
Abstract
BACKGROUND In non-small cell lung cancer (NSCLC) the phosphatidylinositol-4,5-bisphosphate 3-kinase, catalytic subunit alpha (PIK3CA) gene mutations have been reported in fewer than 5% of primary tumors. MATERIALS AND METHODS We assessed PIK3CA gene mutations in 145 tissue samples from central nervous system (CNS) metastases of NSCLC using three polymerase chain reaction (PCR) techniques: high resolution melting-PCR (HRM-PCR), allele-specific-quantitative PCR (ASP-qPCR) and TaqMan PCR. RESULTS HRM analysis allowed us to select three PIK3CA-positive specimens (2.1% of the studied group) and ASP-qPCR techniques identified them as one E542K and two H1047R substitutions, which were confirmed by TaqMan probes. The PIK3CA mutations were indicated only in males (3% of all males). One of the patients was reported to be a non-smoker with adenocarcinoma (AC; 2.5% of the AC group), however, the other two patients were smokers with squamous cell carcinoma (SCC; 3.4% of SCC group). CONCLUSION This is the first report of the presence of PIK3CA gene mutation in CNS-metastatic lesions of NSCLC worldwide that could broaden therapeutic choices in such patients.
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Affiliation(s)
- Marcin Nicoś
- Department of Pneumonology, Oncology and Allergology, Medical University of Lublin, Lublin, Poland Postgraduate School of Molecular Medicine, Medical University of Warsaw, Warsaw, Poland
| | - Paweł Krawczyk
- Department of Pneumonology, Oncology and Allergology, Medical University of Lublin, Lublin, Poland
| | - Tomasz Powrózek
- Department of Pneumonology, Oncology and Allergology, Medical University of Lublin, Lublin, Poland
| | - Paulina Szudy
- Department of Pneumonology, Oncology and Allergology, Medical University of Lublin, Lublin, Poland
| | - Bożena Jarosz
- Department of Neurosurgery and Pediatric Neurosurgery, Medical University of Lublin, Lublin, Poland
| | - Marek Sawicki
- Department of Thoracic Surgery, Medical University of Lublin, Lublin, Poland
| | - Justyna Szumiło
- Department of Clinical Pathomorphology, Medical University of Lublin, Lublin, Poland
| | - Tomasz Trojanowski
- Department of Neurosurgery and Pediatric Neurosurgery, Medical University of Lublin, Lublin, Poland
| | - Janusz Milanowski
- Department of Pneumonology, Oncology and Allergology, Medical University of Lublin, Lublin, Poland
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Nicoś M, Krawczyk P, Jarosz B, Sawicki M, Michnar M, Trojanowski T, Milanowski J. Sensitive methods for screening of the MEK1 gene mutations in patients with central nervous system metastases of non-small cell lung cancer. Clin Transl Oncol 2016; 18:1039-43. [PMID: 26860843 PMCID: PMC5018022 DOI: 10.1007/s12094-016-1483-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2015] [Accepted: 01/06/2016] [Indexed: 10/30/2022]
Abstract
BACKGROUND The mitogen-activated protein kinases 1 and 2 (MEK1, MEK2) are fundamental partners in the RAS-RAF-MEK-ERK pathway that is involved in regulation of cell proliferation, differentiation and survival. Downregulation of the MEK cascades has been implicated in acquiring of the malignant phenotype in various cancers. Somatic mutations in MEK1 gene (substitutions K57N, Q56P, D67N) were described in <1 % of non-small cell lung cancer (NSCLC) and they were more commonly reported in adenocarcinoma patients with current or former smoking status. MATERIALS AND METHODS In the following study, we assessed the MEK1 gene mutations in 145 FFPE tissue samples from central nervous system (CNS) metastases of NSCLC using HRM-PCR and ASP-qPCR techniques. The studied group was heterogeneous in terms of histopathology and smoking status. The prevalence of the MEK1 gene mutation was correlated with the occurrence of mutations in KRAS, EGFR, DDR2, PIK3CA, NRAS, HER2, AKT1 and PTEN genes. RESULTS Using HRM and ASP-qPCR methods we identified one (0.7 %; 1/145) MEK1 substitution (Q56P) in CNS metastases of NSCLC. The mutation was identified in a single, 50-year-old, current smoking men with adenocarcinoma (1.25 %; 1/80 of all adenocarcinomas). CONCLUSIONS According to the current knowledge, the incidence of MEK1 gene mutation in CNS metastatic lesion of NSCLC is the first such report worldwide. The analysis of gene profile in cancer patients may extend the scope of molecularly targeted therapies used both in patients with primary and metastatic tumors of NSCLC.
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Affiliation(s)
- M Nicoś
- Department of Pneumology, Oncology and Allergology, Medical University of Lublin, Jaczewskiego 8, 20-954, Lubin, Poland. .,Postgraduate School of Molecular Medicine, Medical University of Warsaw, 02-091, Warsaw, Poland.
| | - P Krawczyk
- Department of Pneumology, Oncology and Allergology, Medical University of Lublin, Jaczewskiego 8, 20-954, Lubin, Poland
| | - B Jarosz
- Pathological Laboratory, Department of Neurosurgery and Pediatric Neurosurgery, Medical University of Lublin, 20-954, Lubin, Poland
| | - M Sawicki
- Department of Thoracic Surgery, Medical University of Lublin, 20-954, Lubin, Poland
| | - M Michnar
- Department of Pneumology, Oncology and Allergology, Medical University of Lublin, Jaczewskiego 8, 20-954, Lubin, Poland
| | - T Trojanowski
- Pathological Laboratory, Department of Neurosurgery and Pediatric Neurosurgery, Medical University of Lublin, 20-954, Lubin, Poland
| | - J Milanowski
- Department of Pneumology, Oncology and Allergology, Medical University of Lublin, Jaczewskiego 8, 20-954, Lubin, Poland
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Ngalamika O, Liang G, Zhao M, Yu X, Yang Y, Yin H, Liu Y, Yung S, Chan TM, Lu Q. Peripheral whole blood FOXP3 TSDR methylation: a potential marker in severity assessment of autoimmune diseases and chronic infections. Immunol Invest 2014; 44:126-36. [PMID: 25083793 DOI: 10.3109/08820139.2014.938165] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Immune dysregulation is a cardinal feature of autoimmune diseases and chronic microbial infections. In particular, regulatory T cells are downregulated in autoimmune diseases while upregulated in chronic microbial infections. FOXP3 is the master regulator of Treg development. Treg-specific demethylated region (TSDR) is a highly conserved locus on the FOXP3 gene that is fully demethylated in natural Tregs but methylated in effector T cells. In our study, we used high resolution melt-polymerase chain reaction (HRM-PCR) to determine the FOXP3 TSDR methylation status in autoimmune diseases and chronic microbial infections. We found that FOXP3 TSDR to have the highest mean melting temperature (highly methylated) in active SLE patients compared to all the other groups (p < 0.001). The psoriasis group also had a significantly high mean melting temperature (78.62 ± 0.20) when compared with the inactive SLE group (78.49 ± 0.29, p < 0.05) and control group (78.44 ± 0.25, p < 0.01). There was no significant difference in melting temperature between inactive SLE and healthy controls. Disease activity in SLE was directly associated with methylation of the FOXP3 TSDR. On the other hand, patients with chronic microbial infections had significantly lower FOXP3 TSDR mean melting temperature (demethylated) when compared with healthy controls (78.28 ± 0.21 vs 78.44 ± 0.25, p < 0.05). Our results suggest that the use of HRM-PCR to detect FOXP3 TSDR methylation status is a reliable and easy method to predict natural regulatory T cell levels in peripheral blood in different disease conditions. Determining FOXP3 TSDR methylation status can be a useful tool in diagnosis, and monitoring the severity of autoimmune diseases and chronic microbial infections.
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Affiliation(s)
- Owen Ngalamika
- Department of Dermatology, Second Xiangya Hospital, Central South University, Hunan Key Laboratory of Medical Epigenetics , Changsha, Hunan , PR China
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