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Mitochondrial genomes and concerted evolution in Ceratocystis
Thesis (PhD)--University of Pretoria, 2013.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2014
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| _version_ | 1867613480015626240 |
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| access_status_str | Open Access |
| author2 | Wingfield, Brenda D. |
| author_browse | Wingfield, Brenda D. |
| author_facet | Wingfield, Brenda D. |
| collection | Thesis |
| dc_rights_str_mv | © 2013 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Thesis (PhD)--University of Pretoria, 2013. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/32978 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:36:48.836Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2014 |
| publishDateRange | 2014 |
| publishDateSort | 2014 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/32978 Mitochondrial genomes and concerted evolution in Ceratocystis Wingfield, Brenda D. Steenkamp, Emma Theodora Wingfield, Michael J. Naidoo, Kershney Mitochondrial genomes Ceratocystis albifundus Pathogenic species Ceratocystis moniliformis Genomes in Ceratocystis species UCTD Thesis (PhD)--University of Pretoria, 2013. The objective of this study was to characterize the mitochondrial genomes of the species within the genus Ceratocystis and investigate the evolutionary process of the ribosomal RNA cistron found within these fungi. Ceratocystis incorporates a number of pathogenic species affecting a variety of hosts, making the study of these fungi economically significant. The fortuitous identification of a Ceratocystis species, C. manginecans, which contained two different internally transcribed spacer sequence types within the ribosomal rRNA cistron, enabled a study of concerted evolution in this fungus. Using this non-model organism we were able to show empirical evidence for unequal crossing over and gene conversion as the ultimate forces acting on this gene region dictating a concerted evolutionary effect. We suggest that this process is true for all eukaryotes. Using the knowledge drawn from previously characterized and annotated mitochondrial genomes of other eukaryotes, the genomes of three Ceratocystis species, namely Ceratocystis fimbriata, Ceratocystis albifundus and Ceratocystis moniliformis were fully assembled and annotated for comparative analysis. This comparative study addressed the genome size, gene content, tRNA presence as well as intron types and their homing endonucleases found among these three mitochondrial genomes. An interspecies characterization was then undertaken using the mitochondrial genomes of six different C. albifundus isolates from different geographical locations in Africa. Genetic variation and similarities among these isolates supports the previous hypothesis that the origin of this fungus is Southern Africa. It is hoped that the research presented in this thesis will contribute to the improved understanding of the mitochondrial genomes in Ceratocystis species. gm2013 Genetics Unrestricted 2014-01-13T12:30:39Z 2014-01-13T12:30:39Z 2013-09-06 2013 Thesis Naidoo, K 2013, Mitochondrial genomes and concerted evolution in Ceratocystis, PhD thesis, University of Pretoria, Pretoria, viewed yymmdd <http://hdl.handle.net/2263/32978> D13/9/875/gm http://hdl.handle.net/2263/32978 en © 2013 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | Mitochondrial genomes Ceratocystis albifundus Pathogenic species Ceratocystis moniliformis Genomes in Ceratocystis species UCTD Mitochondrial genomes and concerted evolution in Ceratocystis |
| title | Mitochondrial genomes and concerted evolution in Ceratocystis |
| title_full | Mitochondrial genomes and concerted evolution in Ceratocystis |
| title_fullStr | Mitochondrial genomes and concerted evolution in Ceratocystis |
| title_full_unstemmed | Mitochondrial genomes and concerted evolution in Ceratocystis |
| title_short | Mitochondrial genomes and concerted evolution in Ceratocystis |
| title_sort | mitochondrial genomes and concerted evolution in ceratocystis |
| topic | Mitochondrial genomes Ceratocystis albifundus Pathogenic species Ceratocystis moniliformis Genomes in Ceratocystis species UCTD |
| url | http://hdl.handle.net/2263/32978 |