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  1. Article: List2Net: Linking multiple lists of biological data in a network context.

    Afxenti, Sotiroula / Tomazou, Marios / Tsouloupas, George / Lambrianides, Anastasia / Pantzaris, Marios / Spyrou, George M

    Computational and structural biotechnology journal

    2023  Volume 23, Page(s) 10–21

    Abstract: Motivation: A common task in scientific research is the comparison of lists or sets of diverse biological entities such as biomolecules, ontologies, sequences and expression profiles. Such comparisons rely, one way or another, on calculating a measure ... ...

    Abstract Motivation: A common task in scientific research is the comparison of lists or sets of diverse biological entities such as biomolecules, ontologies, sequences and expression profiles. Such comparisons rely, one way or another, on calculating a measure of similarity either by means of vector correlation metrics, set operations such as union and intersection, or specific measures to capture, for example, sequence homology. Subsequently, depending on the data type, the results are often visualized using heatmaps, Venn, Euler, or Alluvial diagrams. While most of the abovementioned representations offer simplicity and interpretability, their effectiveness holds only for a limited number of lists and specific data types. Conversely, network representations provide a more versatile approach where data lists are viewed as interconnected nodes, with edges representing pairwise commonality, correlation, or any other similarity metric. Networks can represent an arbitrary number of lists of any data type, offering a holistic perspective and most importantly, enabling analytics for characterizing and discovering novel insights in terms of centralities, clusters and motifs that can exist in such networks. While several tools that implement the translation of lists to the various commonly used diagrams, such as Venn and Euler, have been developed, a similar tool that can parse, analyze the commonalities and generate networks from an arbitrary number of lists of the same or heterogenous content does not exist.
    Results: To address this gap, we introduce
    Language English
    Publishing date 2023-11-14
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 2694435-2
    ISSN 2001-0370
    ISSN 2001-0370
    DOI 10.1016/j.csbj.2023.11.020
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Bacterial Wars-a tool for the prediction of bacterial predominance based on network analysis measures.

    Oulas, Anastasis / Minadakis, George / Zachariou, Margarita / Tomazou, Marios / Vlamis-Gardikas, Alexios / Spyrou, George M

    NAR genomics and bioinformatics

    2023  Volume 5, Issue 2, Page(s) lqad049

    Abstract: Bacterial Wars (BW) is a network-based tool that applies a two-step pipeline to display information on the competition of bacterial species found in the same microbiome. It utilizes antimicrobial peptide (AMP) sequence similarities to obtain a ... ...

    Abstract Bacterial Wars (BW) is a network-based tool that applies a two-step pipeline to display information on the competition of bacterial species found in the same microbiome. It utilizes antimicrobial peptide (AMP) sequence similarities to obtain a relationship between species. The working hypothesis (putative AMP defense) is that friendly species share sequence similarity among the putative AMPs of their proteomes and are therefore immune to their AMPs. This may not happen in competing bacterial species with dissimilar putative AMPs. Similarities in the putative AMPs of bacterial proteomes may be thus used to predict predominance. The tool provides insights as to which bacterial species are more likely to 'die' in a competing environmental niche.
    Language English
    Publishing date 2023-05-30
    Publishing country England
    Document type Journal Article
    ISSN 2631-9268
    ISSN (online) 2631-9268
    DOI 10.1093/nargab/lqad049
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Oct4 is a gatekeeper of epithelial identity by regulating cytoskeletal organization in skin keratinocytes.

    Christofidou, Elena D / Tomazou, Marios / Voutouri, Chrysovalantis / Michael, Christina / Stylianopoulos, Triantafyllos / Spyrou, George M / Strati, Katerina

    Cell reports

    2024  Volume 43, Issue 3, Page(s) 113859

    Abstract: Oct4 is a pioneer transcription factor regulating pluripotency. However, it is not well known whether Oct4 has an impact on epidermal cells. We generated OCT4 knockout clonal cell lines using immortalized human skin keratinocytes to identify a functional ...

    Abstract Oct4 is a pioneer transcription factor regulating pluripotency. However, it is not well known whether Oct4 has an impact on epidermal cells. We generated OCT4 knockout clonal cell lines using immortalized human skin keratinocytes to identify a functional role for the protein. Here, we report that Oct4-deficient cells transitioned into a mesenchymal-like phenotype with enlarged size and shape, exhibited accelerated migratory behavior, decreased adhesion, and appeared arrested at the G2/M cell cycle checkpoint. Oct4 absence had a profound impact on cortical actin organization, with loss of microfilaments from the cell membrane, increased puncta deposition in the cytoplasm, and stress fiber formation. E-cadherin, β-catenin, and ZO1 were almost absent from cell-cell contacts, while fibronectin deposition was markedly increased in the extracellular matrix (ECM). Mapping of the transcriptional and chromatin profiles of Oct4-deficient cells revealed that Oct4 controls the levels of cytoskeletal, ECM, and differentiation-related genes, whereas epithelial identity is preserved through transcriptional and non-transcriptional mechanisms.
    MeSH term(s) Humans ; Cadherins/metabolism ; Keratinocytes/metabolism ; Cytoskeleton/metabolism ; Actins/metabolism ; beta Catenin/metabolism ; Skin/metabolism ; Cell Adhesion/physiology
    Chemical Substances Cadherins ; Actins ; beta Catenin
    Language English
    Publishing date 2024-02-28
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2649101-1
    ISSN 2211-1247 ; 2211-1247
    ISSN (online) 2211-1247
    ISSN 2211-1247
    DOI 10.1016/j.celrep.2024.113859
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Vir2Drug: a drug repurposing framework based on protein similarities between pathogens.

    Minadakis, George / Tomazou, Marios / Dietis, Nikolas / Spyrou, George M

    Briefings in bioinformatics

    2022  Volume 24, Issue 1

    Abstract: We draw from the assumption that similarities between pathogens at both pathogen protein and host protein level, may provide the appropriate framework to identify and rank candidate drugs to be used against a specific pathogen. Vir2Drug is a drug ... ...

    Abstract We draw from the assumption that similarities between pathogens at both pathogen protein and host protein level, may provide the appropriate framework to identify and rank candidate drugs to be used against a specific pathogen. Vir2Drug is a drug repurposing tool that uses network-based approaches to identify and rank candidate drugs for a specific pathogen, combining information obtained from: (a) ranked pathogen-to-pathogen networks based on protein similarities between pathogens, (b) taxonomy distance between pathogens and (c) drugs targeting specific pathogen's and host proteins. The underlying pathogen networks are used to screen drugs by means of specific methodologies that account for either the host or pathogen's protein targets. Vir2Drug is a useful and yet informative tool for drug repurposing against known or unknown pathogens especially in periods where the emergence for repurposed drugs plays significant role in handling viral outbreaks, until reaching a vaccine. The web tool is available at: https://bioinformatics.cing.ac.cy/vir2drug, https://vir2drug.cing-big.hpcf.cyi.ac.cy.
    MeSH term(s) Drug Repositioning ; Proteins
    Chemical Substances Proteins
    Language English
    Publishing date 2022-12-10
    Publishing country England
    Document type Journal Article
    ZDB-ID 2068142-2
    ISSN 1477-4054 ; 1467-5463
    ISSN (online) 1477-4054
    ISSN 1467-5463
    DOI 10.1093/bib/bbac536
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Portable gene expression guaranteed.

    Tomazou, Marios / Stan, Guy-Bart

    Nature biotechnology

    2018  Volume 36, Issue 4, Page(s) 313–314

    MeSH term(s) DNA Copy Number Variations/genetics ; Gene Expression Regulation/genetics ; Gene Regulatory Networks/ethics ; Gene Regulatory Networks/genetics ; Humans ; Replication Origin/genetics ; Synthetic Biology ; Systems Biology
    Language English
    Publishing date 2018-04-05
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1311932-1
    ISSN 1546-1696 ; 1087-0156
    ISSN (online) 1546-1696
    ISSN 1087-0156
    DOI 10.1038/nbt.4119
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: Methylation status of hypothalamic

    Fanis, Pavlos / Morrou, Maria / Tomazou, Marios / Michailidou, Kyriaki / Spyrou, George M / Toumba, Meropi / Skordis, Nicos / Neocleous, Vassos / Phylactou, Leonidas A

    Frontiers in endocrinology

    2023  Volume 13, Page(s) 1075341

    Abstract: Makorin RING finger protein 3 (MKRN3) is an important factor located on chromosome 15 in the imprinting region associated with Prader-Willi syndrome. ... ...

    Abstract Makorin RING finger protein 3 (MKRN3) is an important factor located on chromosome 15 in the imprinting region associated with Prader-Willi syndrome. Imprinted
    MeSH term(s) Animals ; Female ; Mice ; DNA Methylation ; Epigenesis, Genetic ; Hypothalamus/metabolism ; Sexual Maturation/genetics ; Ubiquitin-Protein Ligases/genetics ; Promoter Regions, Genetic
    Chemical Substances Mkrn3 protein, mouse (EC 2.3.2.27) ; Ubiquitin-Protein Ligases (EC 2.3.2.27)
    Language English
    Publishing date 2023-01-13
    Publishing country Switzerland
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2592084-4
    ISSN 1664-2392
    ISSN 1664-2392
    DOI 10.3389/fendo.2022.1075341
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: Selective Delivery to Cardiac Muscle Cells Using Cell-Specific Aptamers.

    Philippou, Styliana / Mastroyiannopoulos, Nikolaos P / Tomazou, Marios / Oulas, Anastasios / Ackers-Johnson, Matthew / Foo, Roger S / Spyrou, George M / Phylactou, Leonidas A

    Pharmaceuticals (Basel, Switzerland)

    2023  Volume 16, Issue 9

    Abstract: In vivo SELEX is an advanced adaptation of Systematic Evolution of Ligands by Exponential Enrichment (SELEX) that allows the development of aptamers capable of recognizing targets directly within their natural microenvironment. While this methodology ... ...

    Abstract In vivo SELEX is an advanced adaptation of Systematic Evolution of Ligands by Exponential Enrichment (SELEX) that allows the development of aptamers capable of recognizing targets directly within their natural microenvironment. While this methodology ensures a higher translation potential for the selected aptamer, it does not select for aptamers that recognize specific cell types within a tissue. Such aptamers could potentially improve the development of drugs for several diseases, including neuromuscular disorders, by targeting solely the proteins involved in their pathogenesis. Here, we describe our attempt to utilize in vivo SELEX with a modification in the methodology that drives the selection of intravenously injected aptamers towards a specific cell type of interest. Our data suggest that the incorporation of a cell enrichment step can direct the in vivo localization of RNA aptamers into cardiomyocytes, the cardiac muscle cells, more readily over other cardiac cells. Given the crucial role of cardiomyocytes in the disease pathology in DMD cardiomyopathy and therapy, these aptamers hold great potential as drug delivery vehicles with cardiomyocyte selectivity.
    Language English
    Publishing date 2023-09-06
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2193542-7
    ISSN 1424-8247
    ISSN 1424-8247
    DOI 10.3390/ph16091264
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: A novel large intragenic DPYD deletion causing dihydropyrimidine dehydrogenase deficiency: a case report.

    Malekkou, Anna / Tomazou, Marios / Mavrikiou, Gavriella / Dionysiou, Maria / Georgiou, Theodoros / Papaevripidou, Ioannis / Alexandrou, Angelos / Sismani, Carolina / Drousiotou, Anthi / Grafakou, Olga / Petrou, Petros P

    BMC medical genomics

    2024  Volume 17, Issue 1, Page(s) 78

    Abstract: Background: Dihydropyrimidine dehydrogenase (DPD), is the initial and rate-limiting enzyme in the catabolic pathway of pyrimidines. Deleterious variants in the DPYD gene cause DPD deficiency, a rare autosomal recessive disorder. The clinical spectrum of ...

    Abstract Background: Dihydropyrimidine dehydrogenase (DPD), is the initial and rate-limiting enzyme in the catabolic pathway of pyrimidines. Deleterious variants in the DPYD gene cause DPD deficiency, a rare autosomal recessive disorder. The clinical spectrum of affected individuals is wide ranging from asymptomatic to severely affected patients presenting with intellectual disability, motor retardation, developmental delay and seizures. DPD is also important as the main enzyme in the catabolism of 5-fluorouracil (5-FU) which is extensively used as a chemotherapeutic agent. Even in the absence of clinical symptoms, individuals with either complete or partial DPD deficiency face a high risk of severe and even fatal fluoropyrimidine-associated toxicity. The identification of causative genetic variants in DPYD is therefore gaining increasing attention due to their potential use as predictive markers of fluoropyrimidine toxicity.
    Methods: A male infant patient displaying biochemical features of DPD deficiency was investigated by clinical exome sequencing. Bioinformatics tools were used for data analysis and results were confirmed by MLPA and Sanger sequencing.
    Results: A novel intragenic deletion of 71.2 kb in the DPYD gene was identified in homozygosity. The deletion, DPYD(NM_000110.4):c.850 + 23455_1128 + 8811del, eliminates exons 9 and 10 and may have resulted from a non-homologous end-joining event, as suggested by in silico analysis.
    Conclusions: The study expands the spectrum of DPYD variants associated with DPD deficiency. Furthermore, it raises the concern that patients at risk for fluoropyrimidine toxicity due to DPYD deletions could be missed during pre-treatment genetic testing for the currently recommended single nucleotide polymorphisms.
    MeSH term(s) Infant ; Humans ; Male ; Dihydropyrimidine Dehydrogenase Deficiency/genetics ; Dihydropyrimidine Dehydrogenase Deficiency/complications ; Dihydropyrimidine Dehydrogenase Deficiency/drug therapy ; Dihydrouracil Dehydrogenase (NADP)/genetics ; Dihydrouracil Dehydrogenase (NADP)/metabolism ; Antimetabolites, Antineoplastic/adverse effects ; Fluorouracil/adverse effects ; Genetic Testing
    Chemical Substances Dihydrouracil Dehydrogenase (NADP) (EC 1.3.1.2) ; Antimetabolites, Antineoplastic ; Fluorouracil (U3P01618RT)
    Language English
    Publishing date 2024-03-25
    Publishing country England
    Document type Case Reports ; Journal Article
    ZDB-ID 2411865-5
    ISSN 1755-8794 ; 1755-8794
    ISSN (online) 1755-8794
    ISSN 1755-8794
    DOI 10.1186/s12920-024-01846-2
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article: High Throughput Sequencing Technologies as a New Toolbox for Deep Analysis, Characterization and Potentially Authentication of Protection Designation of Origin Cheeses?

    Kamilari, Elena / Tomazou, Marios / Antoniades, Athos / Tsaltas, Dimitrios

    International journal of food science

    2019  Volume 2019, Page(s) 5837301

    Abstract: Protected Designation of Origin (PDO) labeling of cheeses has been established by the European Union (EU) as a quality policy that assures the authenticity of a cheese produced in a specific region by applying traditional production methods. However, ... ...

    Abstract Protected Designation of Origin (PDO) labeling of cheeses has been established by the European Union (EU) as a quality policy that assures the authenticity of a cheese produced in a specific region by applying traditional production methods. However, currently used scientific methods for differentiating and establishing PDO are limited in terms of time, cost, accuracy and their ability to identify through quantifiable methods PDO fraud. Cheese microbiome is a dynamic community that progressively changes throughout ripening, contributing via its metabolism to unique qualitative and sensorial characteristics that differentiate each cheese. High Throughput Sequencing (HTS) methodologies have enabled the more precise identification of the microbial communities developed in fermented cheeses, characterization of their population dynamics during the cheese ripening process, as well as their contribution to the development of specific organoleptic and physio-chemical characteristics. Therefore, their application may provide an additional tool to identify the key microbial species that contribute to PDO cheeses unique sensorial characteristics and to assist to define their typicityin order to distinguish them from various fraudulent products. Additionally, they may assist the cheese-makers to better evaluate the quality, as well as the safety of their products. In this structured literature review indications are provided on the potential for defining PDO enabling differentiating factors based on distinguishable microbial communities shaped throughout the ripening procedures associated to cheese sensorial characteristics, as revealed through metagenomic and metatranscriptomic studies. Conclusively, HTS applications, even though still underexploited, have the potential to demonstrate how the cheese microbiome can affect the ripening process and sensorial characteristics formation via the catabolism of the available nutrients and interplay with other compounds of the matrix and/or production of microbial origin metabolites and thus their further quality enhancement.
    Language English
    Publishing date 2019-11-20
    Publishing country United States
    Document type Journal Article ; Review
    ZDB-ID 2760370-2
    ISSN 2314-5765
    ISSN 2314-5765
    DOI 10.1155/2019/5837301
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article: Putative Antimicrobial Peptides Within Bacterial Proteomes Affect Bacterial Predominance: A Network Analysis Perspective.

    Oulas, Anastasis / Zachariou, Margarita / Chasapis, Christos T / Tomazou, Marios / Ijaz, Umer Z / Schmartz, Georges Pierre / Spyrou, George M / Vlamis-Gardikas, Alexios

    Frontiers in microbiology

    2021  Volume 12, Page(s) 752674

    Abstract: The predominance of bacterial taxa in the gut, was examined in view of the putative antimicrobial peptide sequences (AMPs) within their proteomes. The working assumption was that compatible bacteria would share homology and thus immunity to their ... ...

    Abstract The predominance of bacterial taxa in the gut, was examined in view of the putative antimicrobial peptide sequences (AMPs) within their proteomes. The working assumption was that compatible bacteria would share homology and thus immunity to their putative AMPs, while competing taxa would have dissimilarities in their proteome-hidden AMPs. A network-based method ("Bacterial Wars") was developed to handle sequence similarities of predicted AMPs among
    Language English
    Publishing date 2021-11-12
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2587354-4
    ISSN 1664-302X
    ISSN 1664-302X
    DOI 10.3389/fmicb.2021.752674
    Database MEDical Literature Analysis and Retrieval System OnLINE

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