Charalampos Kyriakopoulos

Charalampos Kyriakopoulos

Former Member

PhD Student

Modeling and Simulation Group, Saarland University

Universität des Saarlandes

Room 326

66123 Saarbrücken

Germany

About Me

Publications

  • C. Kyriakopoulos, V. Wolf: Optimal Observation Time Points in Stochastic Chemical Kinetics, HSB’, CAV Proceedings 2014
  • C. Kyriakopoulos, P. Giehr, G. Fisz, V. Wolf, J. Walter: The Influence of Hydroxylation on Maintaining CpG Methylation Patterns: a HMM approach, PLoS Computational Biology, 2016
  • M. A. Eckersley-Maslin, V. Svensson, C. Krüger, T. Stubbs, P. Giehr, F. Krüger, R. Miragaia, C. Kyriakopoulos, R. Berrens, I. Milagre, J. Walter, S. Teichmann, W. Reik: MERVL/Zscan4 Network Activation Results in Transient Genome-wide DNA Demethylation of mESCs, Cell Reports, 2016
  • C. Kyriakopoulos, P. Giehr, V. Wolf: H(O)TA: estimation of DNA methylation and hydroxylation levels and efficiencies from time course data, Bioinformatics, 2017
  • C. Kyriakopoulos, G. Grossmann, V. Wolf, L. Bortolussi: Lumping of Degree-Based Mean Field and Pair Approximation Equations for Multistate Contact Processes, Physical Review E, 2018
  • P. Giehr, C. Kyriakopoulos, K. Lepikhov, S. Walner, V. Wolf, J. Walter: Two are better than one: HPoxBS – Hairpin oxidative Bisulfite Sequencing, Nucleic Acids Research, 2018
  • G. Grossman, C. Kyriakopoulos, L. Bortolussi, V. Wolf: Lumping the Approximate Master Equation for Multistate Processes in Complex Networks, QEST 2018
  • C. Kyriakopoulos, P. Giehr, A. Lück, J. Walter, V. Wolf: A Hybrid HMM Approach for the Dynamics of DNA Methylation, HSB 2019
  • C. Kyriakopoulos, P. Giehr, K. Nordström, S. Abdulrahman, F. Müller, F. von Meyenn, G. Ficz, W. Reik, V. Wolf, J. Walter: Genome-wide single-base resolution efficiency profiling reveals modulation of maintenance and de novo methylation by Tet di-oxygenases, under review

Tools

Misc.

I have reviewed manuscripts for ASMTA 2016, CAV 2017, CMSB 2014, CMSB 2015, CMSB 2016, CMSB 2018, CONCUR 2018, HSB 2015, HSCC 2016, QEST 2014, QEST 2016, ROCKS 2014 and Bioinformatics Journal.

Publications (8)

2022

1 paper

A comprehensive approach for genome-wide efficiency profiling of DNA modifying enzymes

2022 — Cell Reports Methods

@article{kyriakopoulosAComprehensiveApproachFor2022,
 author = {Charalampos Kyriakopoulos and Karl Nordström and Paula Linh Kramer and Judith Yumiko Gottfreund and Abdulrahman Salhab and Julia Arand and Fabian Müller and Ferdinand von Meyenn and Gabriella Ficz and Wolf Reik and Verena Wolf and Jörn Walter and Pascal Giehr},
 doi = {10.1016/j.crmeth.2022.100187},
 journal = {Cell Reports Methods},
 month = {3},
 number = {3},
 pages = {1-23},
 publisher = {Cell Press},
 title = {A comprehensive approach for genome-wide efficiency profiling of DNA modifying enzymes},
 volume = {2},
 year = {2022}
}
DOI

2019

1 paper

A Hybrid HMM Approach for the Dynamics of DNA Methylation

2019 — Hybrid Systems Biology

@inproceedings{kyriakopoulosAHybridHMMApproach2019,
 address = {Cham},
 author = {Kyriakopoulos, Charalampos and Giehr, Pascal and Lück, Alexander and Walter, Jörn and Wolf, Verena},
 booktitle = {Hybrid Systems Biology},
 editor = {Češka, Milan and Paoletti, Nicola},
 isbn = {978-3-030-28042-0},
 pages = {117--131},
 publisher = {Springer International Publishing},
 title = {A Hybrid HMM Approach for the Dynamics of DNA Methylation},
 year = {2019}
}

2018

3 papers

Two are better than one: HPoxBS - hairpin oxidative bisulfite sequencing

2018 — Nucleic Acids Research

@article{giehrTwoAreBetterThan2018,
 author = {Pascal Giehr and Charalampos Kyriakopoulos and Konstantin Lepikhov and Stefan Wallner and Verena Wolf and Jörn Walter},
 doi = {10.1093/nar/gky422},
 journal = {Nucleic Acids Research},
 month = {6},
 number = {15},
 pages = {1-10},
 publisher = {Oxford University Press},
 title = {Two are better than one: HPoxBS - hairpin oxidative bisulfite sequencing},
 volume = {46},
 year = {2018}
}
DOI

Lumping of degree-based mean-field and pair-approximation equations for multistate contact processes

2018 — Phys. Rev. E

@article{kyriakopoulosLumpingOfDegreeBasedMeanField2018,
$ of the network, which is much smaller than the size of the master equation of the underlying stochastic model, yet numerically solving these equations can still be problematic for large $k_{\max}$. In this paper, we consider AME and PA, extended to cope with multiple local states, and we provide an aggregation procedure that clusters together nodes having similar degrees, treating those in the same cluster as indistinguishable, thus reducing the number of equations while preserving an accurate description of global observables of interest. We also provide an automatic way to build such equations and to identify a small number of degree clusters that give accurate results. The method is tested on several case studies, where it shows a high level of compression and a reduction of computational time of several orders of magnitude for large networks, with minimal loss in accuracy},
 author = {Kyriakopoulos, Charalampos and Grossmann, Gerrit and Wolf, Verena and Bortolussi, Luca},
 doi = {10.1103/PhysRevE.97.012301},
 issue = {1},
 journal = {Phys. Rev. E},
 month = {Jan},
 numpages = {15},
 pages = {012301},
 publisher = {American Physical Society},
 title = {Lumping of degree-based mean-field and pair-approximation equations for multistate contact processes},
 url = {https://link.aps.org/doi/10.1103/PhysRevE.97.012301},
 volume = {97},
 year = {2018}
}
DOI URL

Lumping the Approximate Master Equation for Multistate Processes on Complex Networks

2018 — Quantitative Evaluation of Systems

@inproceedings{grossmannLumpingTheApproximateMaster2018,
 address = {Cham},
 author = {Großmann, Gerrit and Kyriakopoulos, Charalampos and Bortolussi, Luca and Wolf, Verena},
 booktitle = {Quantitative Evaluation of Systems},
 editor = {McIver, Annabelle and Horvath, Andras},
 isbn = {978-3-319-99154-2},
 pages = {157--172},
 publisher = {Springer International Publishing},
 title = {Lumping the Approximate Master Equation for Multistate Processes on Complex Networks},
 year = {2018}
}

2017

1 paper

H(O)TA: estimation of DNA methylation and hydroxylation levels and efficiencies from time course data

2017 — Bioinformatics

@article{kyriakopoulosHOTAEstimationOfDNA2017,
 author = {Kyriakopoulos, Charalampos and Giehr, Pascal and Wolf, Verena},
 doi = {10.1093/bioinformatics/btx042},
 eprint = {https://academic.oup.com/bioinformatics/article-pdf/33/11/1733/49039968/bioinformatics_33_11_1733.pdf},
 issn = {1367-4803},
 journal = {Bioinformatics},
 month = {06},
 number = {11},
 pages = {1733-1734},
 title = {H(O)TA: estimation of DNA methylation and hydroxylation levels and efficiencies from time course data},
 url = {https://doi.org/10.1093/bioinformatics/btx042},
 volume = {33},
 year = {2017}
}
DOI URL

2016

2 papers

The Influence of Hydroxylation on Maintaining CpG Methylation Patterns: A Hidden Markov Model Approach

2016 — PLOS Computational Biology

@article{giehrTheInfluenceOfHydroxylation2016,
 author = {Pascal Giehr and Charalampos Kyriakopoulos and Gabriella Ficz and Verena Wolf and Jörn Walter},
 doi = {10.1371/journal.pcbi.1004905},
 journal = {PLOS Computational Biology},
 month = {5},
 number = {5},
 pages = {1-16},
 publisher = {Public Library of Science},
 title = {The Influence of Hydroxylation on Maintaining CpG Methylation Patterns: A Hidden Markov Model Approach},
 volume = {12},
 year = {2016}
}
DOI

MERVL/Zscan4 Network Activation Results in Transient Genome-wide DNA Demethylation of mESCs

2016 — Cell Reports

@article{eckersleymaslinMERVLZscan4NetworkActivationResults2016,
 author = {Mélanie A. Eckersley-Maslin and Valentine Svensson and Christel Krueger and Thomas M. Stubbs and Pascal Giehr and Felix Krueger and Ricardo J. Miragaia and Charalampos Kyriakopoulos and Rebecca V. Berrens and Inês Milagre and Jörn Walter and Sarah A. Teichmann and Wolf Reik},
 doi = {10.1016/j.celrep.2016.08.087},
 issn = {2211-1247},
 journal = {Cell Reports},
 number = {1},
 pages = {179-192},
 title = {MERVL/Zscan4 Network Activation Results in Transient Genome-wide DNA Demethylation of mESCs},
 url = {https://www.sciencedirect.com/science/article/pii/S2211124716311962},
 volume = {17},
 year = {2016}
}
DOI URL

Teaching (5)

Supervised Students (2)

Co-supervisor of the following Master theses.