Origin of viruses revealed by the genomic study of protein domain structures

Nasir, Arshan

Permalink

https://hdl.handle.net/2142/34445 Copy

Description

Title

Origin of viruses revealed by the genomic study of protein domain structures

Author(s)

Nasir, Arshan

Issue Date

2012-09-18T21:17:31Z

Director of Research (if dissertation) or Advisor (if thesis)

Caetano-Anolles, Gustavo

Department of Study

Crop Sciences

Discipline

Bioinformatics

Degree Granting Institution

University of Illinois at Urbana-Champaign

Degree Name

M.S.

Degree Level

Thesis

Keyword(s)

• Mimivurs
• phylogenomics, protein domain, structure, evolution

Abstract

The discovery of giant viruses with complex proteomes, remnants of translation machinery and virus-specific parasites have raised important questions about their origin. Evidence advocates for their inclusion into global phylogenomic studies and their consideration as a distinct and ancient form of life. Here we reconstruct phylogenies describing the evolution of proteomes and protein domain structures of viruses and cells that define viruses as a ‘fourth supergroup’ along with cellular superkingdoms Archaea, Bacteria, and Eukarya. Universal trees of life (uToLs) place viruses at their root and trees of domains indicate they have evolved via massive reductive evolutionary processes. Since viral domains are widespread among cellular proteomes we propose that viruses mediate gene transfer between cellular species and crucially enhance biodiversity. Results call for a change in the way viruses are perceived. They likely represent a distinct and most ancient form of life and a very crucial part of our planet’s biosphere. Additionally, we assign functions to molecular structures in nearly a thousand proteomes and highlight the conserved nature of cellular proteomes.

Graduation Semester

2012-08

Permalink

http://hdl.handle.net/2142/34445

Copyright and License Information

Copyright 2012 Arshan Nasir. Chapter 3 copyright 2011 IEEE. In reference to IEEE copyrighted material which is used with permission in this thesis, the IEEE does not endorse any of the University of Illinois's products or services. Internal or personal use of this material is permitted. If interested in reprinting/republishing IEEE copyrighted material for advertising or promotional purposes or for creating new collective works for resale or redistribution, please go to http://www.ieee.org/publications_standards/publications/rights/rights_link.html to learn how to obtain a License from RightsLink.

Owning Collections