PHYSICAL MAP OF THE AUSTRALIAN CENTRAL BEARDED DRAGON. (Pogona vitticeps) AND COMPARATIVE MAPPING AMONG DRAGONS. (Squamata, Agamidae) AND AMNIOTES
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1 PHYSICAL MAP OF THE AUSTRALIAN CENTRAL BEARDED DRAGON (Pogona vitticeps) AND COMPARATIVE MAPPING AMONG DRAGONS (Squamata, Agamidae) AND AMNIOTES By MATTHEW JOHN YOUNG B. Environmental Science Institute for Applied Ecology University of Canberra Australia A thesis submitted in partial fulfilment of the requirements for the degree of Bachelor of Applied Science (Honours) at the University of Canberra. January 2011
2 i Abstract This study examines mechanisms of genome evolution among amniotes. Amniota comprises members of Sauropsida (reptiles and birds) and their sister taxa Synapsida (mammals). Within Sauropsida, squamate reptiles are phylogenetically placed in Lepidosauria (lizards, snakes and tuatara), the sister taxa of Archosauria (birds, crocodiles and turtles). As such, squamates hold a key phylogenetic position in elucidating the mechanisms of genome evolution among amniotes and provide critical contrast to the insights already gained from research on mammalian and avian genomes. However, decidedly few squamate genomes have been characterised and there are currently no physical maps spanning the entire karyotype of any squamate species. This study aims to address this knowledge gap by characterising the genome of a squamate reptile and examining mechanisms of genome evolution between squamates and among amniotes. In this study I have constructed the first Bacterial Artificial Chromosome (BAC)-based physical map of an Australian reptile, the central bearded dragon, Pogona vitticeps (Agamidae). I used a cross-species approach to construct the first BAC-based agamid comparative map between P. vitticeps and the eastern water dragon (Physignathus lesueurii). Furthermore, I used these data to construct a comparative map between P. vitticeps, chicken (Gallus gallus) and human (Homo sapiens). Seventy-three P. vitticeps BAC clones were mapped to P. vitticeps mitotic metaphase chromosomes using fluorescence in situ hybridisation (FISH) and end sequenced. The karyotype of P. vitticeps consists of 12 macrochromosomes and 10 microchromosomes. The P. vitticeps physical map has 71 diagnostic clones and 35 genic loci spanning all macrochromosomes and some microchromosomes. The genome-wide GC composition was estimated to be 42.3 percent, suggesting a similar composition to other squamates. Forty P. vitticeps clones were mapped by FISH to P. lesueurii chromosomes demonstrating the value of cross-species BAC mapping as a method for constructing low-resolution comparative maps among squamates. Mechanisms of genome evolution and ancestral syntenies are explored, including the evolution of P. vitticeps ZW sex chromosomes, the recent activity of retrotransposons in squamate genomes and the mechanism of
3 chromosome number reduction in Australian agamids. Indirect evidence of a shared origin between previously proposed non-orthologous sex chromosomes is presented. ii In conclusion, this study has developed and demonstrated the value of a physical map of the model squamate P. vitticeps with a set of molecular anchor markers that with minimal further experimentation may prove to span the entire karyotype of this species. Once it is complete, it is envisioned that this genomic resource will contribute substantially to future research in the field of comparative genomics. Further, this study illustrates how cytogenetic research on squamate genomes can provide valuable insight into elucidating the mechanisms of genome evolution among all amniotes.
4 iii Certificate of Authorship of Thesis Except where clearly acknowledged in footnotes, quotations and the bibliography, I certify that I am the sole author of the thesis submitted today entitled - Physical map of the Australian central bearded dragon (Pogona vitticeps) and comparative mapping among dragons (Squamata, Agamidae) and amniotes in terms of the Statement of Requirements for a Thesis issued by the University Research Degrees Committee. Signature of Author.. Date
5 iv Acknowledgements Firstly, I would like to thank my supervisors Asst Prof. Tariq Ezaz, Prof. Arthur Georges and Dr. Denis O Meally for the opportunity to work on such a challenging and interesting project. Thank you for your advice, guidance, and enthusiasm throughout all aspects of my work. Special thanks must be given to Denis, who gave me my first introduction to FISH and who made sure I didn t get lost amongst the chromosomes or DNA sequence analysis. To my family Annette, Peter and Belinda, thank you for your love and support throughout this demanding year. For funding of this project, I would like to thank the University of Canberra, Institute for Applied Ecology and the Australian Research Council. Thanks must also be given to the Wildlife Genetics Laboratory researchers for their advice, guidance and friendship, especially Juliet Ward for taking me under her wing. And finally, a big thank you to everyone in the postgraduate room, the Wildlife Genetics Laboratory researchers, and staff from the Institute for Applied Ecology for providing great company and friendship and making the workplace an enjoyable place to be in. Special thanks to Kate Hodges for her great company on weekends, her shared passion for sliding in socks down newly polished corridors late at night and her helping hand when it came to a map of Australia.
6 v Table of Contents Abstract... i Acknowledgements... iv List of Figures... viii List of Tables... x Abbreviations... xi Chapter 1: Introduction Overview The development of physical maps Gene mapping Attributes of physical maps Fluorescent in situ hybridization (FISH) and gene mapping Bacterial artificial chromosome (BAC) probes Comparative genomics and gene mapping Amniote phylogeny Amniotes in the comparative genomics era Significance of squamates in comparative genomics The development of a squamate model species... Error! Bookmark not defined. 1.5 Aims and Objectives Specific research aims Chapter 2: Materials and Methods Animals and cell suspensions Pogona vitticeps BAC Library and Probe selection Laboratory methods BAC DNA extraction Fluorescence in situ hybridization (FISH), microscopy and image capture... 22
7 vi Hybridisation of telomeric probe DAPI banding BAC end-sequencing Measurements and data analysis Chromosome nomenclature, sizes, banding, signal and centromere position Sequence analysis, gene identification and comparative mapping BLAST (Basic Local Alignment Search Tool) analyses BLAT (BLAST-Like Alignment Tool) analyses Chapter 3: Results Physical map of Pogona vitticeps Karyotype of Pogona vitticeps DAPI banding Idiogram S rdna localisation Telomere localisation BAC-based Physical map of Pogona vitticeps Molecular characterisation of Physignathus lesueurii chromosomes Karyotype of Physignathus lesueurii S rdna localization Telomere localization Chapter 4: Discussion... Error! Bookmark not defined Molecular characterisation of Pogona vitticeps chromosomes Error! Bookmark not defined Karyotype of Pogona vitticeps... Error! Bookmark not defined DAPI ideograms and GC composition... Error! Bookmark not defined Telomeres... Error! Bookmark not defined Pogona vitticeps physical map... Error! Bookmark not defined.
8 vii 4.2 Comparing genomes between Australian agamids... Error! Bookmark not defined Molecular characterisation of Physignathus lesueurii chromosomes... Error! Bookmark not defined Australian agamid BAC-based comparative map Error! Bookmark not defined. 4.3 Amniote comparative map... Error! Bookmark not defined. 4.4 Future research directions... Error! Bookmark not defined. 4.5 Conclusion... Error! Bookmark not defined. References Appendices... 76
9 viii List of Figures Figure 1.1. Phylogeny of amniotes...22 Figure 1.2. Diploid chromosome number mapped onto a chronogram of a representative Australian agamid phylogeny...31 Figure 2.1. Map of Australia showing approximate species distribution of P. vitticeps and sampling locations...33 Figure 3.1. Karyotype of P. vitticeps...41 Figure 3.2. Ideogram of P. vitticeps DAPI bands...45 Figure S rdna FISH on P. vitticeps metaphase chromosomes...46 Figure 3.4. Karyotype of P. vitticeps chromosomes showing hybridisation signals of telomeric probe (TTAGGG) Figure 3.5. Example FISH experiments in P. vitticeps...50 Figure 3.6. Physical map of P. vitticeps showing the location of diagnostic BAC clones mapped by FISH and orthology to chicken chromosomes...56 Figure 3.7. Karyotype of P. lesueurii...59 Figure S rdna FISH on P. lesueurii metaphase chromosomes...61 Figure 3.9. Hybridisation of telomeric sequences in P. lesueurii chromosomes...62 Figure 4.1. P. vitticeps and P. lesueurii comparative map...71 Figure 4.2. Chromosomal homologies among selected amniotes...76
10 ix Appendix 4. FISH images of BACs mapped to P. vitticeps mitotic metaphase spreads, data were used in the development of the P. vitticeps cytogenetic map (section 3.1.5)...96 Appendix 5. FISH images of each BAC mapped to P. lesueurii mitotic metaphase spreads...97
11 x List of Tables Table 3.1. Relative sizes, centromeric index, and proportional lengths of P. vitticeps chromosomes...43 Table 3.2. Gene contents and mapped locations of BAC clones in P. vitticeps and locations of chicken and human orthologues...51 Table 3.3. BAC clones that hybridise to multiple P. vitticeps chromosomes...22 Table 3.4. Relative sizes, centromeric index, and proportional lengths of P. lesueurii chromosomes...31 Table 4.1. Genome-wide GC content of P. vitticeps and representative amniotes...66 Appendix 1. Confidence levels in BLAST and BLAT analysis of identified P. vitticeps orthologues from end sequenced BAC clones...91 Appendix 2. P. vitticeps microchromosome BAC two-colour FISH experiments...22 Appendix 3. P. vitticeps physical map data...31 Appendix 4. Male P. lesueurii comparative map data...22
12 xi Abbreviations APTX Aprataxin ATP5A1 ATP synthase, H+ transporting, mitochondrial F1 complex, alpha subunit 1, cardiac muscle BAC Bacterial artificial chromosome BCL6 B-cell CLL/lymphoma 6 BLAST Basic local alignment search tool BLAT BLAST-like alignment tool CA10 Carbonic anhydrase X CHD1 Chromodomain helicase DNA binding protein 1 CTBP2 C-terminal binding protein 2 CTNNB1 Catenin (cadherin-associated protein), beta 1, 88kDa DAPI 4,6-diamidino-2-phenylindole DDX58 DEAD (Asp-Glu-Ala-Asp) box polypeptide 58 DMRT1 Doublesex and mab-3 related transcription factor 1 dutp 2 -Deoxyuridine 5 -triphosphate EIF3H Eukaryotic translation initiation factor 3, subunit H FAM83B Family with sequence similarity 83, member B FBRSL1 Fibrosin-like 1 GHR Growth hormone receptor GMPPA GDP-mannose pyrophosphorylase A HCRTR2 Hypocretin (orexin) receptor 2 HMGCLL1 3-hydroxymethyl-3-methylglutaryl-CoA lyase-like 1 IBSP Integrin-binding sialoprotein IPO7 Importin 7 IQSEC3 IQ motif and Sec7 domain 3 KAT2B K(lysine) acetyltransferase 2B KLF6 Kruppel-like factor 6 MYST2 MYST histone acetyltransferase 2 NAV2 Neuron navigator 2 NPRL3 Nitrogen permease regulator-like 3 PSMA2 Proteasome (prosome, macropain) subunit, alpha type, 2 RAB5A RAB5A, member RAS oncogene family
13 xii RRM1 Ribonucleotide reductase M1 SRY Sex determining region Y SUB1 SUB1 homolog (S. cerevisiae) TAX1BP1 Tax1 (human T-cell leukemia virus type I) binding protein 1 TMEM41B Transmembrane protein 41B TNFRSF11B Tumor necrosis factor receptor superfamily, member 11b TTN Titin WAC WW domain containing adaptor with coiled-coil ZNF143 Zinc finger protein 143
PHYSICAL MAP OF THE AUSTRALIAN CENTRAL BEARDED DRAGON. (Pogona vitticeps) AND COMPARATIVE MAPPING AMONG DRAGONS. (Squamata, Agamidae) AND AMNIOTES
PHYSICAL MAP OF THE AUSTRALIAN CENTRAL BEARDED DRAGON (Pogona vitticeps) AND COMPARATIVE MAPPING AMONG DRAGONS (Squamata, Agamidae) AND AMNIOTES By MATTHEW JOHN YOUNG B. Environmental Science Institute
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