Use this URL to cite or link to this record in EThOS:
Title: Investigating mechanisms of genome expansion in Corydoradinae catfish
Author: Marburger, Sarah
ISNI:       0000 0004 5916 9935
Awarding Body: Prifysgol Bangor University
Current Institution: Bangor University
Date of Award: 2015
Availability of Full Text:
Access from EThOS:
Access from Institution:
The Corydoradinae catfish are a diverse sub-family of neo-tropical catfishes (order Siluriformes) with more than 170 species described to date. One of the most compelling features of this sub-family is the enormous amount of variation in genome size. With species containing between 0.5 pg and 4.8pg of DNA, variation is comparable to that found across the Teleostei as a whole. Previous phylogenetic analysis identified nine distinct lineages within the Corydoradinae, with more basal lineages possessing smaller genomes and with largest genome sizes found in the most derived lineages. To date, nothing is known about the mechanism that drove this genome expansion in the Corydoradinae, though Whole Genome Duplication (WGD) events have been suggested. Here, the incidence of WGD events has been investigated using a Hox gene and a restriction site associated DNA (RAD) sequencing data set. Both data sets identified a major duplication event at the base of the group, with additional duplication events occurring across the family. These duplication events were shown to have led to relaxed purifying selection and increased functional divergence of HoxA13a copies in the Corydoradinae compared with teleosts that have not undergone additional rounds of WGD. The RAD data set confirmed significant genome-wide shifts in duplicate, multi-haplotype regions across the Corydoradinae, and indicates that several species from lineages 6-9 are functionally polyploid, whereas species that underwent earlier WGDs have largely diploidized and are likely paleopolyploids. An increase in paralogous genes was noted, with Gene Ontology suggesting that gene retention in the Corydoradinae mirrors previously described retention in Tetraodon following the fish-specific genome duplication in the Teleostei. Intriguingly, the RAD data also identified a significant expansion of Transposable Elements (TEs), driven by a DNA TE superfamily (Tc1-Mariner). This expansion significantly contributed to the genome size variation, though to a lesser degree than the WGD events identified within this thesis.
Supervisor: Not available Sponsor: NERC
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available