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Riley DR, Sieber KB, Robinson KM, White JR, Ganesan A, Nourbakhsh S, Dunning Hotopp JC. Bacteria-human somatic cell lateral gene transfer is enriched in cancer samples. PLoS Comput Biol 2013; 9:e1003107. [PMID: 23840181 PMCID: PMC3688693 DOI: 10.1371/journal.pcbi.1003107] [Citation(s) in RCA: 111] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2012] [Accepted: 05/01/2013] [Indexed: 12/14/2022] Open
Abstract
There are 10× more bacterial cells in our bodies from the microbiome than human cells. Viral DNA is known to integrate in the human genome, but the integration of bacterial DNA has not been described. Using publicly available sequence data from the human genome project, the 1000 Genomes Project, and The Cancer Genome Atlas (TCGA), we examined bacterial DNA integration into the human somatic genome. Here we present evidence that bacterial DNA integrates into the human somatic genome through an RNA intermediate, and that such integrations are detected more frequently in (a) tumors than normal samples, (b) RNA than DNA samples, and (c) the mitochondrial genome than the nuclear genome. Hundreds of thousands of paired reads support random integration of Acinetobacter-like DNA in the human mitochondrial genome in acute myeloid leukemia samples. Numerous read pairs across multiple stomach adenocarcinoma samples support specific integration of Pseudomonas-like DNA in the 5′-UTR and 3′-UTR of four proto-oncogenes that are up-regulated in their transcription, consistent with conversion to an oncogene. These data support our hypothesis that bacterial integrations occur in the human somatic genome and may play a role in carcinogenesis. We anticipate that the application of our approach to additional cancer genome projects will lead to the more frequent detection of bacterial DNA integrations in tumors that are in close proximity to the human microbiome. There are 10× more bacterial cells in the human body than there are human cells that are part of the human microbiome. Many of those bacteria are in constant, intimate contact with human cells. We sought to establish if bacterial cells insert their own DNA into the human genome. Such random mutations could cause disease in the same manner that mutagens like UV rays from the sun or chemicals in cigarettes induce mutations. We detected the integration of bacterial DNA in the human genome more readily in tumors than normal samples. In particular, extensive amounts of DNA with similarity to Acinetobacter DNA were fused to human mitochondrial DNA in acute myeloid leukemia samples. We also identified specific integrations of DNA with similarity to Pseudomonas DNA near the untranslated regulatory regions of four proto-oncogenes. This supports our hypothesis that bacterial integrations occur in the human somatic genome that may potentially play a role in carcinogenesis. Further study in this area may provide new avenues for cancer prevention.
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Affiliation(s)
- David R. Riley
- Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, Maryland, United States of America
| | - Karsten B. Sieber
- Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, Maryland, United States of America
| | - Kelly M. Robinson
- Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, Maryland, United States of America
| | - James Robert White
- Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, Maryland, United States of America
| | - Ashwinkumar Ganesan
- Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, Maryland, United States of America
- Computer Science and Electrical Engineering Department, University of Maryland Baltimore County, Baltimore, Maryland, United States of America
| | - Syrus Nourbakhsh
- Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, Maryland, United States of America
- University of Maryland College Park, College Park, Maryland, United States of America
| | - Julie C. Dunning Hotopp
- Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, Maryland, United States of America
- Department of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, Maryland, United States of America
- Greenebaum Cancer Center, University of Maryland School of Medicine, Baltimore, Maryland, United States of America
- * E-mail:
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Gordiyuk VV, Kondratov AG, Gerashchenko GV, Kashuba VI. Novel epigenetic markers of early epithelial tumor growth and prognosis. ACTA ACUST UNITED AC 2013. [DOI: 10.7124/bc.00081b] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- V. V. Gordiyuk
- Institute of Molecular Biology and Genetics, National Academy of Sciences of Ukraine
| | - A. G. Kondratov
- Institute of Molecular Biology and Genetics, National Academy of Sciences of Ukraine
| | - G. V. Gerashchenko
- Institute of Molecular Biology and Genetics, National Academy of Sciences of Ukraine
| | - V. I. Kashuba
- Institute of Molecular Biology and Genetics, National Academy of Sciences of Ukraine
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NotI microarrays: novel epigenetic markers for early detection and prognosis of high grade serous ovarian cancer. Int J Mol Sci 2012. [PMID: 23202957 PMCID: PMC3497331 DOI: 10.3390/ijms131013352] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Chromosome 3-specific NotI microarray (NMA) containing 180 clones with 188 genes was used in the study to analyze 18 high grade serous ovarian cancer (HGSOC) samples and 7 benign ovarian tumors. We aimed to find novel methylation-dependent biomarkers for early detection and prognosis of HGSOC. Thirty five NotI markers showed frequency of methylation/deletion more or equal to 17%. To check the results of NMA hybridizations several samples for four genes (LRRC3B, THRB, ITGA9 and RBSP3 (CTDSPL)) were bisulfite sequenced and confirmed the results of NMA hybridization. A set of eight biomarkers: NKIRAS1/RPL15, THRB, RBPS3 (CTDSPL), IQSEC1, NBEAL2, ZIC4, LOC285205 and FOXP1, was identified as the most prominent set capable to detect both early and late stages of ovarian cancer. Sensitivity of this set is equal to (72 ± 11)% and specificity (94 ± 5)%. Early stages represented the most complicated cases for detection. To distinguish between Stages I + II and Stages III + IV of ovarian cancer the most perspective set of biomarkers would include LOC285205, CGGBP1, EPHB1 and NKIRAS1/RPL15. The sensitivity of the set is equal to (80 ± 13)% and the specificity is (88 ± 12)%. Using this technique we plan to validate this panel with new epithelial ovarian cancer samples and add markers from other chromosomes.
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Dmitriev AA, Kashuba VI, Haraldson K, Senchenko VN, Pavlova TV, Kudryavtseva AV, Anedchenko EA, Krasnov GS, Pronina IV, Loginov VI, Kondratieva TT, Kazubskaya TP, Braga EA, Yenamandra SP, Ignatjev I, Ernberg I, Klein G, Lerman MI, Zabarovsky ER. Genetic and epigenetic analysis of non-small cell lung cancer with NotI-microarrays. Epigenetics 2012; 7:502-13. [PMID: 22491060 DOI: 10.4161/epi.19801] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
This study aimed to clarify genetic and epigenetic alterations that occur during lung carcinogenesis and to design perspective sets of newly identified biomarkers. The original method includes chromosome 3 specific NotI-microarrays containing 180 NotI clones associated with genes for hybridization with 40 paired normal/tumor DNA samples of primary lung tumors: 28 squamous cell carcinomas (SCC) and 12 adenocarcinomas (ADC). The NotI-microarray data were confirmed by qPCR and bisulfite sequencing analyses. Forty-four genes showed methylation and/or deletions in more than 15% of non-small cell lung cancer (NSCLC) samples. In general, SCC samples were more frequently methylated/deleted than ADC. Moreover, the SCC alterations were observed already at stage I of tumor development, whereas in ADC many genes showed tumor progression specific methylation/deletions. Among genes frequently methylated/deleted in NSCLC, only a few were already known tumor suppressor genes: RBSP3 (CTDSPL), VHL and THRB. The RPL32, LOC285205, FGD5 and other genes were previously not shown to be involved in lung carcinogenesis. Ten methylated genes, i.e., IQSEC1, RBSP3, ITGA 9, FOXP1, LRRN1, GNAI2, VHL, FGD5, ALDH1L1 and BCL6 were tested for expression by qPCR and were found downregulated in the majority of cases. Three genes (RBSP3, FBLN2 and ITGA9) demonstrated strong cell growth inhibition activity. A comprehensive statistical analysis suggested the set of 19 gene markers, ANKRD28, BHLHE40, CGGBP1, RBSP3, EPHB1, FGD5, FOXP1, GORASP1/TTC21, IQSEC1, ITGA9, LOC285375, LRRC3B, LRRN1, MITF, NKIRAS1/RPL15, TRH, UBE2E2, VHL, WNT7A, to allow early detection, tumor progression, metastases and to discriminate between SCC and ADC with sensitivity and specificity of 80-100%.
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Affiliation(s)
- Alexey A Dmitriev
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institute, Stockholm, Sweden
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5
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Kashuba VI, Grigorieva EV, Kvasha SM, Pavlova TV, Grigoriev V, Protopopov A, Kharchenko O, Gizatullin R, Rynditch AV, Zabarovsky ER. Cloning and Initial Functional Characterization of Mlk4α and Mlk4β. GENOMICS INSIGHTS 2011. [PMID: 26217104 PMCID: PMC4510602 DOI: 10.4137/gei.s6092] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
We have cloned a novel human mixed-lineage kinase gene, MLK4. Two alternatively spliced forms, MLK4α (580 aa) and MLK4β (1036 aa), have been identified and mapped to chromosomal band 1q42. MLK4 shows high amino acid homology to the kinase catalytic domain of MLK3 (72%), MLK1 (71%) and MLK2 (69%). Strong expression of MLK4 was detected in the human pancreas and kidneys. pCMV-MLK4β c-myc-tagged protein (human) was expressed in the cytoplasm and nucleus of transiently transfected COS-1 cells, while pCMV-MLK4α c-myc-tagged protein (human) was expressed in cytoplasm only. Both MLK4 isoforms reduced the colony formation ability of MCF7 cells by 85%-95% and almost totally suppressed cell proliferation in the CyQUANT cell proliferation assay. Human pCMV-MLK4β transgenic mice expressed the MLK4β in all tissues examined but no phenotypic abnormalities were observed. Thus, in this work, we present the cloning and sequencing of MLK4α and MLK4β for the first time; the data obtained suggest that MLK4 may function as a MAP kinase.
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Affiliation(s)
- Vladimir I Kashuba
- Department of Microbiology, Tumor and Cell Biology, Department of Clinical Science and Education, Södersjukhuset, Karolinska Institute, Stockholm, 17177, Sweden. ; Institute of Molecular Biology and Genetics, Ukrainian National Academy of Sciences, Kiev, 03143, Ukraine
| | - Elvira V Grigorieva
- Department of Microbiology, Tumor and Cell Biology, Department of Clinical Science and Education, Södersjukhuset, Karolinska Institute, Stockholm, 17177, Sweden. ; Institute of Molecular Biology and Biophysics, Siberian Division of Russian Academy of Medical Sciences, Novosibirsk, 630117, Russia
| | - Sergei M Kvasha
- Institute of Molecular Biology and Genetics, Ukrainian National Academy of Sciences, Kiev, 03143, Ukraine
| | - Tatiana V Pavlova
- Department of Microbiology, Tumor and Cell Biology, Department of Clinical Science and Education, Södersjukhuset, Karolinska Institute, Stockholm, 17177, Sweden. ; Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, 119991, Russia
| | | | - Alexei Protopopov
- Department of Microbiology, Tumor and Cell Biology, Department of Clinical Science and Education, Södersjukhuset, Karolinska Institute, Stockholm, 17177, Sweden
| | - Olga Kharchenko
- Department of Microbiology, Tumor and Cell Biology, Department of Clinical Science and Education, Södersjukhuset, Karolinska Institute, Stockholm, 17177, Sweden. ; Pavlov Institute of Physiology, Russian Academy of Sciences, St. Petersburg, 199034, Russia
| | - Rinat Gizatullin
- Department of Microbiology, Tumor and Cell Biology, Department of Clinical Science and Education, Södersjukhuset, Karolinska Institute, Stockholm, 17177, Sweden
| | - Alla V Rynditch
- Institute of Molecular Biology and Genetics, Ukrainian National Academy of Sciences, Kiev, 03143, Ukraine
| | - Eugene R Zabarovsky
- Department of Microbiology, Tumor and Cell Biology, Department of Clinical Science and Education, Södersjukhuset, Karolinska Institute, Stockholm, 17177, Sweden. ; Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, 119991, Russia
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Samuelsson JK, Alonso S, Yamamoto F, Perucho M. DNA fingerprinting techniques for the analysis of genetic and epigenetic alterations in colorectal cancer. Mutat Res 2010; 693:61-76. [PMID: 20851135 DOI: 10.1016/j.mrfmmm.2010.08.010] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2010] [Revised: 08/07/2010] [Accepted: 08/24/2010] [Indexed: 01/03/2023]
Abstract
Genetic somatic alterations are fundamental hallmarks of cancer. In addition to point and other small mutations targeting cancer genes, solid tumors often exhibit aneuploidy as well as multiple chromosomal rearrangements of large fragments of the genome. Whether somatic chromosomal alterations and aneuploidy are a driving force or a mere consequence of tumorigenesis remains controversial. Recently it became apparent that not only genetic but also epigenetic alterations play a major role in carcinogenesis. Epigenetic regulation mechanisms underlie the maintenance of cell identity crucial for development and differentiation. These epigenetic regulatory mechanisms have been found substantially altered during cancer development and progression. In this review, we discuss approaches designed to analyze genetic and epigenetic alterations in colorectal cancer, especially DNA fingerprinting approaches to detect changes in DNA copy number and methylation. DNA fingerprinting techniques, despite their modest throughput, played a pivotal role in significant discoveries in the molecular basis of colorectal cancer. The aim of this review is to revisit the fingerprinting technologies employed and the oncogenic processes that they unveiled.
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Affiliation(s)
- Johanna K Samuelsson
- Sanford-Burnham Medical Research Institute (SBMRI), 10901N. Torrey Pines Rd, La Jolla, CA 92037, United States
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Yamada T, Fialho AM, Punj V, Bratescu L, Gupta TKD, Chakrabarty AM. Internalization of bacterial redox protein azurin in mammalian cells: entry domain and specificity. Cell Microbiol 2005; 7:1418-31. [PMID: 16153242 DOI: 10.1111/j.1462-5822.2005.00567.x] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Azurin is a member of a group of copper-containing redox proteins called cupredoxins. Different cupredoxins are produced by different aerobic bacteria as agents of electron transfer. Recently, we demonstrated that azurin enters into J774 and several types of cancer cells leading to the induction of apoptosis. We now demonstrate that azurin is internalized in J774 or cancer cells in a temperature-dependent manner. Azurin shows preferential entry into cancer compared with normal cells. An 28-amino-acid fragment of azurin fused to glutathione S-transferase (GST) or the green fluorescent protein (GFP), which are incapable of entering mammalian cells by themselves, can be internalized in J774 or human melanoma or breast cancer cells at 37 degrees C, but not at 4 degrees C. Competition experiments as well as studies with inhibitors such as cytochalasin D suggest that azurin may enter cells, at least in part, by a receptor-mediated endocytic process. The 28-amino-acid peptide therefore acts as a potential protein transduction domain (PTD), and can be used as a vehicle to transport cargo proteins such as GST and GST-GFP fusion proteins. Another member of the cupredoxin family, rusticyanin, that has also been shown to enter J774 and human cancer cells and exert cytotoxicity, does not demonstrate preferential entry for cancer cells and lacks the structural features characteristic of the azurin PTD.
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Affiliation(s)
- Tohru Yamada
- Department of Microbiology and Immunology, University of Illinois College of Medicine, Chicago, 60612, USA
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8
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Sulimova GE, Rakhmanaliev ER, Klimov EA, Kompaniytsev AA, Udina IG, Zabarovsky ER, Kisselev LL. NotI Sequence-Tagged Sites as Markers of Genes on Human Chromosome 3. Mol Biol 2005. [DOI: 10.1007/s11008-005-0075-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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9
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Levitsky VG, Katokhin AV, Podkolodnaya OA, Furman DP, Kolchanov NA. NPRD: Nucleosome Positioning Region Database. Nucleic Acids Res 2005; 33:D67-70. [PMID: 15608285 PMCID: PMC540003 DOI: 10.1093/nar/gki049] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
Abstract
Nucleosome Positioning Region Database (NPRD), which is compiling the available experimental data on locations and characteristics of nucleosome formation sites (NFSs), is the first curated NFS-oriented database. The object of the database is a single NFS described in an individual entry. When annotating results of NFS experimental mapping, we pay special attention to several important functional characteristics, such as the relationship between type of gene activity and nucleosome positioning, the influence of non-histone proteins on nucleosome formation, type of the variant of nucleosome positioning (translational or rotational), indication of tissue types and states of cell activity, description of experimental methods used and accuracy of nucleosome position determination, and the results of applying theoretical and computer methods to the analysis of contextual and conformational DNA properties. At present, the NPRD database contains 438 entries and integrates the data described in 124 original papers. The database URL: http://srs6.bionet.nsc.ru/srs6/. Then click the button ‘Databank’ and open the link NUCLEOSOME.
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Affiliation(s)
- Victor G Levitsky
- Institute of Cytology and Genetics SB RAS, prosp. Lavrentieva 10, Novosibirsk 630090, Russia.
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10
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Abstract
The program RECON has been designed for constructing profiles of nucleosome potential, characterizing the probability of nucleosome formation along DNA sequences. The program used for recognition of nucleosome formation sites in genomic DNA sequences. It was developed using discriminant analysis based on a genetic algorithm method utilizing statistics for dinucleotide location within local regions of nucleosome formation sites. The program RECON is available at http://wwwmgs.bionet.nsc.ru/mgs/programs/recon/.
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Affiliation(s)
- Victor G Levitsky
- Novosibirsk State University, Pirogova 2, Novosibirsk, 630090, Russia.
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Abstract
A CpG island DNA methylator phenotype has been postulated to explain silencing of the hMLH1 DNA mismatch repair gene in cancer of the microsatellite mutator phenotype. To evaluate this model, we analyzed methylation in CpG islands from six mutator and suppressor genes, and thirty random genomic sites, in a panel of colorectal cancers. Tumor-specific somatic hypermethylation was a widespread age-dependent process that followed a normal Gaussian distribution. Because there was no discontinuity in methylation rate, our results challenge the methylator phenotype hypothesis and its hypothetical pathological underlying defect. We also show that the mutator phenotype dominates over the gradual accumulation of DNA hypermethylation in determining the genotypic features that govern the phenotypic peculiarities of colon cancer of the mutator pathway.
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Affiliation(s)
- Kentaro Yamashita
- The Burnham Institute, La Jolla Cancer Center, Cancer Genetics and Epigenetics Program, 10901 North Torrey Pines Road, La Jolla, CA 92037, USA
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Chichester C, Nikitin F, Ravarini JC, Lisacek F. Consistency checks for characterizing protein forms. Comput Biol Chem 2003; 27:29-35. [PMID: 12798037 DOI: 10.1016/s1476-9271(02)00095-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Proteomics enforces the reverse chronological order on the gene to protein dogma and imposes amino acid sequences as a starting point of an investigation relative to function. By this approach, proteomics data can confirm the presence of multiple forms of a protein. Notwithstanding variations attributed specific individual features of organisms and tissues, from two to over ten protein forms can be identified in a given sample. The present work describes some guidelines for tracking the origin of alternative protein forms and attempts to tag the details of sequence data in the literature. Working via these guidelines we have uncovered a third alternative form of the Pim subfamily of oncogenes. The term form is here combined with the qualification alternative to describe any product of a given gene including closely related paralogs. This paper also emphasizes the need for consistency checks in annotation processes, such as gene clustering, to avoid losing important details describing protein alternative forms. By identifying alternative protein forms, we illustrate the fact that rationalizing of protein function via the identification of protein-protein interactions should in reality be that of identifying (alternative) form-form interactions.
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Zabarovska V, Kutsenko AS, Petrenko L, Kilosanidze G, Ljungqvist O, Norin E, Midtvedt T, Winberg G, Möllby R, Kashuba VI, Ernberg I, Zabarovsky ER. NotI passporting to identify species composition of complex microbial systems. Nucleic Acids Res 2003; 31:E5-5. [PMID: 12527794 PMCID: PMC140530 DOI: 10.1093/nar/gng005] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
We describe here a new method for large-scale scanning of microbial genomes on a quantitative and qualitative basis. To achieve this aim we propose to create NotI passports: databases containing NotI tags. We demonstrated that these tags comprising 19 bp of sequence information could be successfully generated using DNA isolated from intestinal or fecal samples. Such NotI passports allow the discrimination between closely related bacterial species and even strains. This procedure for generating restriction site tagged sequences (RSTS) is called passporting and can be adapted to any other rare cutting restriction enzyme. A comparison of 1312 tags from available sequenced Escherichia coli genomes, generated with the NotI, PmeI and SbfI restriction enzymes, revealed only 219 tags that were not unique. None of these tags matched human or rodent sequences. Therefore the approach allows analysis of complex microbial mixtures such as in human gut and identification with high accuracy of a particular bacterial strain on a quantitative and qualitative basis.
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Affiliation(s)
- Veronika Zabarovska
- Microbiology and Tumor Biology Center, Department of Cell and Molecular Biology, Karolinska Institute, 171 77 Stockholm, Sweden
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Current Awareness on Comparative and Functional Genomics. Comp Funct Genomics 2003. [PMCID: PMC2447381 DOI: 10.1002/cfg.226] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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