- published: 08 Jul 2014
- views: 185
A phylogenetic network or reticulation is any graph used to visualize evolutionary relationships (either abstractly or explicitly) between nucleotide sequences, genes, chromosomes, genomes, or species. They are employed when reticulate events such as hybridization, horizontal gene transfer, recombination, or gene duplication and loss are believed to be involved. They differ from phylogenetic trees by the explicit modeling, by means of the addition of hybrid nodes (nodes with two parents) instead of only tree nodes (nodes with only one parent).Phylogenetic trees are a subset of phylogenetic networks. Phylogenetic networks can be inferred and visualised with software such as SplitsTree and, more recently, Dendroscope. A standard format for representing phylogenetic networks is a variant of Newick format which is extended to support networks as well as trees.
Many kinds and subclasses of phylogenetic networks have been defined based on the biological phenomenon they represent or which data they are built from (hybridization networks, usually built from rooted trees, recombination networks from binary sequences, median networks from a set of splits, optimal realizations and reticulograms from a distance matrix), or restrictions to get computationally tractable problems (galled trees, and their generalizations level-k phylogenetic networks, tree-child or tree-sibling phylogenetic networks).
Presentation by Jeremy Brown, with coauthors Guifang Zhou, Wen Huang, Jeremy Ash, Melissa Marchand, Kyle Gallivan and Jim Wilgenbusch Evolution 2014 conference
- By: Alejandro Herrada, IFISC - Date: 2011-02-04 10:30:00 - Description: PhD thesis public defense. Supervisors: Emilio Hernández-García, Víctor M. Eguíluz and Carlos M. Duarte. Abstract: The increasing interest during the last century in the study and comprehension of the evolutionary processes that govern biodiversity, together with the huge expansion that the complex network approach has undergone in the last decade, has motivated us to address the interrelation of both scientic elds. In that sense, within the context of complex network theory, the main purpose of this work has been to provide new tools for the topological characterization of evolutionary trees, as well as to contribute to enlarging the knowledge of the evolutionary patterns depicted in them. Thereby, we ha...
- By: Roberto F.S. Andrade, Instituto de Fisica, Universidade Federal da Bahia, Salvador, Brasil - Date: 2010-11-23 15:00:00 - Description: This work comprises data mining of protein sequences related to the chitin metabolic pathway of completely sequenced genomes of extant organisms pertaining to the three life domains, followed by meta-analysis using traditional sequence similarity comparison and complex network approaches. Complex networks involving proteins of the chitin metabolic pathway in extant organisms were constructed based on protein sequence similarity. Several usual network indices are used to obtain information on the topology of these networks, including those related to higher order neighborhood properties and the concept of distance between networks. Due to ...
Read your free e-book: http://hotaudiobook.com/mebk/50/en/B005PS507U/book An introduction to biological networks and methods for their analysis Analysis of Biological Networks is the first book of its kind to provide readers with a comprehensive introduction to the structural analysis of biological networks at the interface of biology and computer science. The book begins with a brief overview of biological networks and graph theory/graph algorithms and goes on to explore: global network properties, network centralities, network motifs, network clustering, Petri nets, signal transduction and gene regulation networks, protein interaction networks, metabolic networks, phylogenetic networks, ecological networks, and correlation networks. Analysis of Biological Networks is a self-contained int...
About the Speaker: Muhammad Adeel, is part of a research project on "Phylogenetic Study" project, whose premise is to isolate beneficial bacteria from the cotton soil, in order to add to the disease resistance property of cotton. About the Talk: Muhammad Adeel makes a case for the use of social media to add benefit to research in biotechnology. He talks about his aspiration to integrate the sequence of human genes into a social network that would assist people and doctors alike. About TEDx: In the spirit of ideas worth spreading, TEDx is a program of local, self-organized events that bring people together to share a TED-like experience. At a TEDx event, TEDTalks video and live speakers combine to spark deep discussion and connection in a small group. These local, self-organized events a...
006 - Phylogenetics Paul Andersen discusses the specifics of phylogenetics. The evolutionary relationships of organisms are discovered through both morphological and molecular data. A specific type of phylogenetic tree, the cladogram, is also covered. Do you speak another language? Help me translate my videos: http://www.bozemanscience.com/translations/ All of the images are licensed under creative commons and public domain licensing: http://commons.wikimedia.org/wiki/File:Circulatory-system-warm-blooded-bg.jpg. B, Lennert. English: Modification of Original Schematic, March 5, 2012. http://upload.wikimedia.org/wikipedia/commons/thumb/7/78/Circulatory-system-reptiles-bg.jpg/508px-Circulatory-system-reptiles-bg.jpg. http://commons.wikimedia.org/wiki/File:Reptilian_circulatory_system.PNG...
Use of a database of protein structures, and the http://www.phylogeny.fr website are demonstrated in an example, slightly musical, project
Megan Owen January 22, 2010
Sergei Kosakovsky Pond, UCSD January 25, 2012
Terrell Hodge (Western Michigan Univ.) gave a talk entitled "Geometric approaches to phylogenetic tree reconstruction" at the Algebraic and Discrete Biological Models for Undergraduate Courses Tutorial held at NIMBioS June 18-20, 2014. To read more about the tutorial, click the following link: http://nimbios.org/tutorials/TT_mathbio
Table of Contents: 00:00 - C100/C200 Discussion Week 2 00:17 - Today’s schedule 00:57 - Definitions used in lecture 02:42 - Sequence notation 05:23 - Gene notation 06:35 - Sequence Similarity 07:59 - Homologs, orthologs, and paralogs 08:01 - Sequence Similarity 08:06 - Homologs, orthologs, and paralogs 09:06 - Phylogenetic trees 11:00 - Review of speciation and gene duplication 14:37 - Phylogenetic trees 14:38 - Homologs, orthologs, and paralogs 14:53 - Phylogenetic trees 14:53 - Review of speciation and gene duplication 15:45 - Network representation 16:18 - Network representation 16:32 - Reciprocal “best-hit” between genomes 17:13 - Reciprocal “best-hit” between genomes 17:14 - Reciprocal “best-hit” between genomes 17:14 - Network representation 17:15 - Reciprocal “best-hit” between g...
Philippe Lemey, KU Leuven September 10, 2010
Nick Matzke, Postdoc at NIMBioS, gave a talk entitled "Statistical model choice in phylogenetic biogeography" at the Computing in the Cloud Tutorial, held 6-8 April 2014. To read more about the workshop, click the following link: http://www.nimbios.org/tutorials/TT_cloud
Systems Biology Adam Arkin, University of California, Berkeley and E.O. Lawrence Berkeley National Laboratory Over eons, evolution acts on organisms to hone their strategies for survival in an uncertain world. The ultimate substrate for evolution is the genome, the sequence of which implicitly encodes dynamic biochemical networks that process external signals into cellular actions. We are investigating approaches that link phylogenetic and comparative genomics analyses to physical chemical dynamics of cellular networks and evolutionary game theory to create a theory of the evolution and architecture of cellular networks. Ultimately we hope to divine principles of design in these systems which we can exploit to predict, control and design new behaviors in cellular networks. We have applied ...