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  1. Article ; Online: Biclustering sparse binary genomic data.

    van Uitert, Miranda / Meuleman, Wouter / Wessels, Lodewyk

    Journal of computational biology : a journal of computational molecular cell biology

    2008  Volume 15, Issue 10, Page(s) 1329–1345

    Abstract: Genomic datasets often consist of large, binary, sparse data matrices. In such a dataset, one is often interested in finding contiguous blocks that (mostly) contain ones. This is a biclustering problem, and while many algorithms have been proposed to ... ...

    Abstract Genomic datasets often consist of large, binary, sparse data matrices. In such a dataset, one is often interested in finding contiguous blocks that (mostly) contain ones. This is a biclustering problem, and while many algorithms have been proposed to deal with gene expression data, only two algorithms have been proposed that specifically deal with binary matrices. None of the gene expression biclustering algorithms can handle the large number of zeros in sparse binary matrices. The two proposed binary algorithms failed to produce meaningful results. In this article, we present a new algorithm that is able to extract biclusters from sparse, binary datasets. A powerful feature is that biclusters with different numbers of rows and columns can be detected, varying from many rows to few columns and few rows to many columns. It allows the user to guide the search towards biclusters of specific dimensions. When applying our algorithm to an input matrix derived from TRANSFAC, we find transcription factors with distinctly dissimilar binding motifs, but a clear set of common targets that are significantly enriched for GO categories.
    MeSH term(s) Algorithms ; Cluster Analysis ; Computational Biology/methods ; Databases, Genetic ; Genome ; Models, Genetic ; Oligonucleotide Array Sequence Analysis/methods ; Software ; Transcription Factors/genetics ; Transcription Factors/metabolism
    Chemical Substances Transcription Factors
    Language English
    Publishing date 2008-12
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2030900-4
    ISSN 1557-8666 ; 1066-5277
    ISSN (online) 1557-8666
    ISSN 1066-5277
    DOI 10.1089/cmb.2008.0066
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Validation of the Charlson Comorbidity Index in acutely hospitalized elderly adults: a prospective cohort study.

    Frenkel, Wijnanda J / Jongerius, Erika J / Mandjes-van Uitert, Miranda J / van Munster, Barbara C / de Rooij, Sophia E

    Journal of the American Geriatrics Society

    2014  Volume 62, Issue 2, Page(s) 342–346

    Abstract: Objectives: To determine whether the Charlson Comorbidity Index (CCI) predicts short- and long-term mortality.: Design: Prospective cohort study.: Setting: The medical department of two university hospitals and one community-based hospital.: ... ...

    Abstract Objectives: To determine whether the Charlson Comorbidity Index (CCI) predicts short- and long-term mortality.
    Design: Prospective cohort study.
    Setting: The medical department of two university hospitals and one community-based hospital.
    Participants: Acutely hospitalized individuals aged 65 and older with a mean age of 77.8 ± 7.9, 45.8% male (n = 1,313).
    Measurements: In eligible persons, information on demographic characteristics, activities of daily living (modified Katz ADL Index score), and disease-related measures was collected within 48 hours after admission. Follow-up using self-reporting questionnaires was performed at 3 months and 1 year. Functional decline was defined as a decline of at least 1 point on the modified Katz ADL Index score at 12 months from baseline. Mortality data at 3 months and 1 and 5 years were collected from the municipal database.
    Results: Logistic regression analysis, adjusted for age and sex, showed that participants with a CCI of 5 or more had higher 3-month (odds ratio (OR) = 3.6, 95% confidence interval (CI) = 2.1-6.4), 1-year (OR = 7.1, 95% CI = 4.2-11.9), and 5-year (OR = 52.4, 95% CI = 13.3-206.4) mortality than those with a CCI of 0. Participants with CCI scores between 1 and 4 also had greater mortality risk at 3 months and 1 and 5 years.
    Conclusion: The CCI independently predicts short- and long-term mortality in acutely ill hospitalized elderly adults.
    MeSH term(s) Activities of Daily Living ; Acute Disease/epidemiology ; Aged ; Comorbidity ; Confidence Intervals ; Emergency Service, Hospital/statistics & numerical data ; Female ; Follow-Up Studies ; Hospitalization/statistics & numerical data ; Humans ; Length of Stay/statistics & numerical data ; Male ; Netherlands/epidemiology ; Odds Ratio ; Prognosis ; Prospective Studies ; Reproducibility of Results ; Risk Assessment/methods ; Risk Factors ; Severity of Illness Index ; Surveys and Questionnaires ; Survival Rate/trends ; Time Factors
    Language English
    Publishing date 2014-02
    Publishing country United States
    Document type Journal Article ; Multicenter Study ; Research Support, Non-U.S. Gov't ; Validation Studies
    ZDB-ID 80363-7
    ISSN 1532-5415 ; 0002-8614
    ISSN (online) 1532-5415
    ISSN 0002-8614
    DOI 10.1111/jgs.12635
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Differentially expressed genes in the pre-eclamptic placenta: a systematic review and meta-analysis.

    Kleinrouweler, C Emily / van Uitert, Miranda / Moerland, Perry D / Ris-Stalpers, Carrie / van der Post, Joris A M / Afink, Gijs B

    PloS one

    2013  Volume 8, Issue 7, Page(s) e68991

    Abstract: Objective: To systematically review the literature on human gene expression data of placental tissue in pre-eclampsia and to characterize a meta-signature of differentially expressed genes in order to identify novel putative diagnostic markers.: Data ... ...

    Abstract Objective: To systematically review the literature on human gene expression data of placental tissue in pre-eclampsia and to characterize a meta-signature of differentially expressed genes in order to identify novel putative diagnostic markers.
    Data sources: Medline through 11 February 2011 using MeSH terms and keywords related to placenta, gene expression and gene expression arrays; GEO database using the term "placent*"; and reference lists of eligible primary studies, without constraints.
    Methods: From 1068 studies retrieved from the search, we included original publications that had performed gene expression array analyses of placental tissue in the third trimester and that reported on differentially expressed genes in pre-eclampsia versus normotensive controls. Two reviewers independently identified eligible studies, extracted descriptive and gene expression data and assessed study quality. Using a vote-counting method based on a comparative meta-profiling algorithm, we determined a meta-signature that characterizes the significant intersection of differentially expressed genes from the collection of independent gene signatures.
    Results: We identified 33 eligible gene expression array studies of placental tissue in the 3(rd) trimester comprising 30 datasets on mRNA expression and 4 datasets on microRNA expression. The pre-eclamptic placental meta-signature consisted of 40 annotated gene transcripts and 17 microRNAs. At least half of the mRNA transcripts encode a protein that is secreted from the cell and could potentially serve as a biomarker.
    Conclusions: In addition to well-known and validated genes, we identified 14 transcripts not reported previously in relation to pre-eclampsia of which the majority is also expressed in the 1(st) trimester placenta, and three encode a secreted protein.
    MeSH term(s) Female ; Gene Expression Profiling ; Gene Expression Regulation ; Humans ; MicroRNAs/genetics ; MicroRNAs/metabolism ; Placenta/metabolism ; Placenta/pathology ; Pre-Eclampsia/genetics ; Pregnancy ; Pregnancy Trimester, Third ; RNA, Messenger/genetics ; RNA, Messenger/metabolism ; Signal Transduction/genetics
    Chemical Substances MicroRNAs ; RNA, Messenger
    Language English
    Publishing date 2013-07-12
    Publishing country United States
    Document type Journal Article ; Meta-Analysis ; Review ; Systematic Review
    ISSN 1932-6203
    ISSN (online) 1932-6203
    DOI 10.1371/journal.pone.0068991
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Meta-Analysis of Placental Transcriptome Data Identifies a Novel Molecular Pathway Related to Preeclampsia.

    van Uitert, Miranda / Moerland, Perry D / Enquobahrie, Daniel A / Laivuori, Hannele / van der Post, Joris A M / Ris-Stalpers, Carrie / Afink, Gijs B

    PloS one

    2015  Volume 10, Issue 7, Page(s) e0132468

    Abstract: Studies using the placental transcriptome to identify key molecules relevant for preeclampsia are hampered by a relatively small sample size. In addition, they use a variety of bioinformatics and statistical methods, making comparison of findings ... ...

    Abstract Studies using the placental transcriptome to identify key molecules relevant for preeclampsia are hampered by a relatively small sample size. In addition, they use a variety of bioinformatics and statistical methods, making comparison of findings challenging. To generate a more robust preeclampsia gene expression signature, we performed a meta-analysis on the original data of 11 placenta RNA microarray experiments, representing 139 normotensive and 116 preeclamptic pregnancies. Microarray data were pre-processed and analyzed using standardized bioinformatics and statistical procedures and the effect sizes were combined using an inverse-variance random-effects model. Interactions between genes in the resulting gene expression signature were identified by pathway analysis (Ingenuity Pathway Analysis, Gene Set Enrichment Analysis, Graphite) and protein-protein associations (STRING). This approach has resulted in a comprehensive list of differentially expressed genes that led to a 388-gene meta-signature of preeclamptic placenta. Pathway analysis highlights the involvement of the previously identified hypoxia/HIF1A pathway in the establishment of the preeclamptic gene expression profile, while analysis of protein interaction networks indicates CREBBP/EP300 as a novel element central to the preeclamptic placental transcriptome. In addition, there is an apparent high incidence of preeclampsia in women carrying a child with a mutation in CREBBP/EP300 (Rubinstein-Taybi Syndrome). The 388-gene preeclampsia meta-signature offers a vital starting point for further studies into the relevance of these genes (in particular CREBBP/EP300) and their concomitant pathways as biomarkers or functional molecules in preeclampsia. This will result in a better understanding of the molecular basis of this disease and opens up the opportunity to develop rational therapies targeting the placental dysfunction causal to preeclampsia.
    MeSH term(s) Female ; Gene Expression Profiling/methods ; Humans ; Placenta/metabolism ; Pre-Eclampsia/genetics ; Pre-Eclampsia/metabolism ; Pregnancy ; Protein Interaction Mapping
    Language English
    Publishing date 2015-07-14
    Publishing country United States
    Document type Journal Article ; Meta-Analysis ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ISSN 1932-6203
    ISSN (online) 1932-6203
    DOI 10.1371/journal.pone.0132468
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Book: Series expansions for finite-state Markov chains

    Heidergott, Bernd / Hordijk, Arie / Uitert, Miranda van

    (Discussion paper / Tinbergen Institute : 4, Econometrics ; 2005-086)

    2005  

    Author's details Bernd Heidergott, Arie Hordijk, Miranda van Uitert
    Series title Discussion paper / Tinbergen Institute : 4, Econometrics ; 2005-086
    Keywords 24#34#60#81
    Language English
    Size 22 S, graph. Darst
    Publishing place Amsterdam u.a.
    Document type Book
    Database ECONomics Information System

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  6. Article ; Online: Meta-Analysis of Placental Transcriptome Data Identifies a Novel Molecular Pathway Related to Preeclampsia.

    Miranda van Uitert / Perry D Moerland / Daniel A Enquobahrie / Hannele Laivuori / Joris A M van der Post / Carrie Ris-Stalpers / Gijs B Afink

    PLoS ONE, Vol 10, Iss 7, p e

    2015  Volume 0132468

    Abstract: Studies using the placental transcriptome to identify key molecules relevant for preeclampsia are hampered by a relatively small sample size. In addition, they use a variety of bioinformatics and statistical methods, making comparison of findings ... ...

    Abstract Studies using the placental transcriptome to identify key molecules relevant for preeclampsia are hampered by a relatively small sample size. In addition, they use a variety of bioinformatics and statistical methods, making comparison of findings challenging. To generate a more robust preeclampsia gene expression signature, we performed a meta-analysis on the original data of 11 placenta RNA microarray experiments, representing 139 normotensive and 116 preeclamptic pregnancies. Microarray data were pre-processed and analyzed using standardized bioinformatics and statistical procedures and the effect sizes were combined using an inverse-variance random-effects model. Interactions between genes in the resulting gene expression signature were identified by pathway analysis (Ingenuity Pathway Analysis, Gene Set Enrichment Analysis, Graphite) and protein-protein associations (STRING). This approach has resulted in a comprehensive list of differentially expressed genes that led to a 388-gene meta-signature of preeclamptic placenta. Pathway analysis highlights the involvement of the previously identified hypoxia/HIF1A pathway in the establishment of the preeclamptic gene expression profile, while analysis of protein interaction networks indicates CREBBP/EP300 as a novel element central to the preeclamptic placental transcriptome. In addition, there is an apparent high incidence of preeclampsia in women carrying a child with a mutation in CREBBP/EP300 (Rubinstein-Taybi Syndrome). The 388-gene preeclampsia meta-signature offers a vital starting point for further studies into the relevance of these genes (in particular CREBBP/EP300) and their concomitant pathways as biomarkers or functional molecules in preeclampsia. This will result in a better understanding of the molecular basis of this disease and opens up the opportunity to develop rational therapies targeting the placental dysfunction causal to preeclampsia.
    Keywords Medicine ; R ; Science ; Q
    Subject code 572
    Language English
    Publishing date 2015-01-01T00:00:00Z
    Publisher Public Library of Science (PLoS)
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  7. Article ; Online: Computational identification of insertional mutagenesis targets for cancer gene discovery.

    de Jong, Johann / de Ridder, Jeroen / van der Weyden, Louise / Sun, Ning / van Uitert, Miranda / Berns, Anton / van Lohuizen, Maarten / Jonkers, Jos / Adams, David J / Wessels, Lodewyk F A

    Nucleic acids research

    2011  Volume 39, Issue 15, Page(s) e105

    Abstract: Insertional mutagenesis is a potent forward genetic screening technique used to identify candidate cancer genes in mouse model systems. An important, yet unresolved issue in the analysis of these screens, is the identification of the genes affected by ... ...

    Abstract Insertional mutagenesis is a potent forward genetic screening technique used to identify candidate cancer genes in mouse model systems. An important, yet unresolved issue in the analysis of these screens, is the identification of the genes affected by the insertions. To address this, we developed Kernel Convolved Rule Based Mapping (KC-RBM). KC-RBM exploits distance, orientation and insertion density across tumors to automatically map integration sites to target genes. We perform the first genome-wide evaluation of the association of insertion occurrences with aberrant gene expression of the predicted targets in both retroviral and transposon data sets. We demonstrate the efficiency of KC-RBM by showing its superior performance over existing approaches in recovering true positives from a list of independently, manually curated cancer genes. The results of this work will significantly enhance the accuracy and speed of cancer gene discovery in forward genetic screens. KC-RBM is available as R-package.
    MeSH term(s) Animals ; Chromosome Mapping/methods ; Computational Biology/methods ; DNA Transposable Elements ; Gene Expression ; Genes, Neoplasm ; Leukemia Virus, Murine/genetics ; Mice ; Mutagenesis, Insertional
    Chemical Substances DNA Transposable Elements
    Language English
    Publishing date 2011-06-07
    Publishing country England
    Document type Evaluation Study ; Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 186809-3
    ISSN 1362-4962 ; 1362-4954 ; 0301-5610 ; 0305-1048
    ISSN (online) 1362-4962 ; 1362-4954
    ISSN 0301-5610 ; 0305-1048
    DOI 10.1093/nar/gkr447
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Rest-activity patterns in patients with delirium.

    van Uitert, Miranda / de Jonghe, Annemarieke / de Gijsel, Swana / van Someren, Eus J W / de Rooij, Sophia E J A / van Munster, Barbara C

    Rejuvenation research

    2011  Volume 14, Issue 5, Page(s) 483–490

    Abstract: Objective: Delirium is a frequent syndrome in elderly hospital patients. Symptoms typically show a fluctuating course during the day, with patients exhibiting disturbances of their sleep-wake rhythm. Delirium is frequently underdiagnosed, especially the ...

    Abstract Objective: Delirium is a frequent syndrome in elderly hospital patients. Symptoms typically show a fluctuating course during the day, with patients exhibiting disturbances of their sleep-wake rhythm. Delirium is frequently underdiagnosed, especially the so-called hypoactive subtype. Devices measuring 24-hr motor patterns could contribute to the recognition of delirium. The purpose of this paper is two-fold. First, the results of a pilot study are presented, in which 24-hr motor patterns of delirious patients are measured with a wrist-actigraph. Second, studies reporting 24-hr motor patterns in delirious patients are systematically reviewed.
    Methods: The pilot study included 9 patients, 65 years or older, with a hip fracture in need of surgical repair. For the review, MEDLINE and Embase were searched for studies on motor activity assessment in delirious patients.
    Results: In the pilot study, the 24-hr activity rhythm was severely disturbed during delirium, and most actigraphic sleep parameter estimates indicated significantly worse sleep during delirious nights. The systematic search resulted in 10 papers. In 3 papers, the sleep-wake rhythm of delirious patients was significantly different from that of nondelirious patients. In 5 papers, delirious patients could be classified into delirium subtypes. In the 2 remaining papers, 24-hr motor patterns of delirium subtypes were not significantly different.
    Conclusion: Activity patterns revealed differences between delirious and nondelirious patients and between the different subtypes, even in small samples of patients. Future studies, with preferably larger sample sizes, should confirm the potential of activity pattern measuring devices in the early detection of delirium.
    MeSH term(s) Aged ; Aged, 80 and over ; Delirium/physiopathology ; Female ; Humans ; Male ; Pilot Projects ; Rest/physiology
    Language English
    Publishing date 2011-10
    Publishing country United States
    Document type Journal Article ; Meta-Analysis
    ZDB-ID 2150779-X
    ISSN 1557-8577 ; 1549-1684
    ISSN (online) 1557-8577
    ISSN 1549-1684
    DOI 10.1089/rej.2011.1181
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Differentially expressed genes in the pre-eclamptic placenta

    C Emily Kleinrouweler / Miranda van Uitert / Perry D Moerland / Carrie Ris-Stalpers / Joris A M van der Post / Gijs B Afink

    PLoS ONE, Vol 8, Iss 7, p e

    a systematic review and meta-analysis.

    2013  Volume 68991

    Abstract: OBJECTIVE: To systematically review the literature on human gene expression data of placental tissue in pre-eclampsia and to characterize a meta-signature of differentially expressed genes in order to identify novel putative diagnostic markers. DATA ... ...

    Abstract OBJECTIVE: To systematically review the literature on human gene expression data of placental tissue in pre-eclampsia and to characterize a meta-signature of differentially expressed genes in order to identify novel putative diagnostic markers. DATA SOURCES: Medline through 11 February 2011 using MeSH terms and keywords related to placenta, gene expression and gene expression arrays; GEO database using the term "placent*"; and reference lists of eligible primary studies, without constraints. METHODS: From 1068 studies retrieved from the search, we included original publications that had performed gene expression array analyses of placental tissue in the third trimester and that reported on differentially expressed genes in pre-eclampsia versus normotensive controls. Two reviewers independently identified eligible studies, extracted descriptive and gene expression data and assessed study quality. Using a vote-counting method based on a comparative meta-profiling algorithm, we determined a meta-signature that characterizes the significant intersection of differentially expressed genes from the collection of independent gene signatures. RESULTS: We identified 33 eligible gene expression array studies of placental tissue in the 3(rd) trimester comprising 30 datasets on mRNA expression and 4 datasets on microRNA expression. The pre-eclamptic placental meta-signature consisted of 40 annotated gene transcripts and 17 microRNAs. At least half of the mRNA transcripts encode a protein that is secreted from the cell and could potentially serve as a biomarker. CONCLUSIONS: In addition to well-known and validated genes, we identified 14 transcripts not reported previously in relation to pre-eclampsia of which the majority is also expressed in the 1(st) trimester placenta, and three encode a secreted protein.
    Keywords Medicine ; R ; Science ; Q
    Subject code 572
    Language English
    Publishing date 2013-01-01T00:00:00Z
    Publisher Public Library of Science (PLoS)
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  10. Article ; Online: Large-scale mutagenesis in p19(ARF)- and p53-deficient mice identifies cancer genes and their collaborative networks.

    Uren, Anthony G / Kool, Jaap / Matentzoglu, Konstantin / de Ridder, Jeroen / Mattison, Jenny / van Uitert, Miranda / Lagcher, Wendy / Sie, Daoud / Tanger, Ellen / Cox, Tony / Reinders, Marcel / Hubbard, Tim J / Rogers, Jane / Jonkers, Jos / Wessels, Lodewyk / Adams, David J / van Lohuizen, Maarten / Berns, Anton

    Cell

    2008  Volume 133, Issue 4, Page(s) 727–741

    Abstract: p53 and p19(ARF) are tumor suppressors frequently mutated in human tumors. In a high-throughput screen in mice for mutations collaborating with either p53 or p19(ARF) deficiency, we identified 10,806 retroviral insertion sites, implicating over 300 loci ... ...

    Abstract p53 and p19(ARF) are tumor suppressors frequently mutated in human tumors. In a high-throughput screen in mice for mutations collaborating with either p53 or p19(ARF) deficiency, we identified 10,806 retroviral insertion sites, implicating over 300 loci in tumorigenesis. This dataset reveals 20 genes that are specifically mutated in either p19(ARF)-deficient, p53-deficient or wild-type mice (including Flt3, mmu-mir-106a-363, Smg6, and Ccnd3), as well as networks of significant collaborative and mutually exclusive interactions between cancer genes. Furthermore, we found candidate tumor suppressor genes, as well as distinct clusters of insertions within genes like Flt3 and Notch1 that induce mutants with different spectra of genetic interactions. Cross species comparative analysis with aCGH data of human cancer cell lines revealed known and candidate oncogenes (Mmp13, Slamf6, and Rreb1) and tumor suppressors (Wwox and Arfrp2). This dataset should prove to be a rich resource for the study of genetic interactions that underlie tumorigenesis.
    MeSH term(s) Animals ; Cell Line, Tumor ; Cloning, Molecular ; Cyclin-Dependent Kinase Inhibitor p16/genetics ; Cyclin-Dependent Kinase Inhibitor p16/metabolism ; Gene Regulatory Networks ; Genes, Tumor Suppressor ; Genes, p53 ; Genomics/methods ; Humans ; Mice ; Mice, Knockout ; Mutagenesis, Insertional ; Neoplasms/genetics ; Neoplasms/metabolism ; Sequence Analysis, DNA ; Tumor Suppressor Protein p53/metabolism
    Chemical Substances Cdkn2a protein, mouse ; Cyclin-Dependent Kinase Inhibitor p16 ; Tumor Suppressor Protein p53
    Language English
    Publishing date 2008-05-12
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 187009-9
    ISSN 1097-4172 ; 0092-8674
    ISSN (online) 1097-4172
    ISSN 0092-8674
    DOI 10.1016/j.cell.2008.03.021
    Database MEDical Literature Analysis and Retrieval System OnLINE

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