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Complete Thesis: the Genomic Basis of Climate and Host Adaptation

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The genomic basis of climate and host adaptation RAHUL VIVEK RANE Submitted in total fulfilment of the requirements of the degree of Doctor of Philosophy MARCH 2017 School of Biosciences, Faculty of Science The University of Melbourne (Produced on archival quality paper) Page | i Abstract Many species are currently threatened by the direct and indirect effects of anthropogenically driven climate change. The elevation of global temperatures and increase in variability in both temperature and precipitation pose a risk to biodiversity as species are pushed close to their thermal safety margins. Current predictions suggest a dramatic loss of species diversity and the contraction of geographical ranges of many species. Many ectothermic insects that cannot regulate their body temperature are likely to be threatened, particularly ecologically- restricted herbivorous insects that depend for on plants for food and that are often in phenological synchrony with their plant hosts. However, adaptive shifts in these species in response to host loss and climatic extremes may counter the effects of climate change to some extent. This highlights the importance of studying species-specific adaptation mechanisms including host interactions. This dissertation contributes to this overall aim by studying the genomic basis of climatic and host adaptation. I use Drosophila melanogaster as a model system at the intraspecific level, and Drosophila species from the repleta group as a model system for the comparative level. In assessing the genomic basis of host responses, I consider a much broader range of insect taxa. This dissertation begins with a study on the use of chromosome level sequencing of D. melanogaster populations from two ends of a thermal cline. I present genomic evidence for the role of the inversion 3R Payne in capturing alleles favourable to local climatic conditions in the non-inverted form, and therefore driving adaptation to climate change. The study further elucidates the impact of climatically important chromosomal inversions in driving higher linkage disequilibrium on the non-inverted form - potentially benefiting both karyotypes. Page | ii In the second chapter, I develop a new pipeline, Orthonome, and tools for multi-species comparisons for prediction of orthologues and inparalogues with the highest accuracy and recall. Using Orthonome, I was able to identify a much greater level of conservation across Drosophilid lineages than earlier thought, amounting to nearly 33% better resolution than industry-accepted methods. I then use Orthonome in the third chapter to compare the genomes of 58 insect species – most of which are known to be agricultural pests. Testing across eight gene families, I present evidence for genomic patterns in only four gene families (P450s, CCEs, GSTs and ABCs) as being associated with polyphagy or particular host ranges. While three of them have been reported before, I find that ABC transporters present much stronger evidence than reflected in earlier studies, with feeding behaviour as well as host tissue displaying an effect on gene gain in more voracious pest species. Finally, in the last study, I use novel genomic data and evidence from the repleta group of drosophilids to carry out phylogenetically constrained analyses of genes potentially associated with host and thermal stress adaptation. My aim here is to find mutually exclusive evolutionary pathways to neofunctionalisation between stress tolerant cactophilic specialists and less tolerant generalists in the group. I also find a different adaptive response in the cactophilic species compared to the generalist species; these species show little lineage specific gene gain, suggesting an exception to current standing theories on neofunctionalisation for adaptation. I further discuss the applicability the species level and order level analyses for an overall detailed and systematic approach to identify the genomic basis of climatic and host adaptation. Page | iii Declaration This is to certify that: 1. The thesis comprises only my original work towards the PhD except where indicated in the Preface, 2. Due acknowledgement has been made in the text to all other material used, 3. The thesis is fewer than 100 000 words in length, exclusive of Tables, maps, bibliographies and appendices OR the thesis is [number of words] as approved by the Research Higher Degrees Committee. SIGNATURE (Rahul Vivek Rane) Page | iv Preface For the work carried out in Chapter 2, Ary A. Hoffmann (AAH), Siu Fai Lee (Ronald) (SFL) and Rahul Vivek Rane (RVR) designed research; RVR and Lea Rako (LR) performed research; RVR, SFL and AAH contributed new reagents/analytical tools; RVR and MK analysed data; and RVR, SFL and AAH wrote the paper. At least 60% of the work was undertaken by RVR and this study was published in the journal Molecular Ecology 24(10):2423-32. doi: 10.1111/mec.13161. In Chapter 3, RVR and SFL conceptualised the study. RVR designed the pipeline and wrote the scripts. Web interface conceptualised by RVR and TN and implemented/maintained by TN. John Oakeshott (JO), AAH and SFL helped interpret the biological significance of results. RVR, JO, AAH and SFL wrote the manuscript. At least 75% of the work was undertaken by RVR and the manuscript is currently under review with the journal BMC Genomics. For Chapter 4, RVR, JO and Tom Walsh (TW) conceptualised the study. Stephen Pearce (SP), Lars Jermiin (LJ), Karl Gordon (KG), SFL and AAH helped design the experiments and analyses. AAH, JO and SFL helped RVR with analyses and writing while TW, LJ and SP helped conceptualise the visualisations. A small part of the study was published in the journal Current Opinion in Insect Science 13:70-6. doi: 10.1016/j.cois.2015.12.001. The paper has been included in Appendix 1.0 for reference. Approximately 65% of the work was undertaken by RVR and follow up work and preparation for publication will be undertaken during the examination of the thesis. AAH, JO, SFL, CS and Goujie Zhang (GZ) provided materials for the work in Chapter 5 as a part of a larger project. RVR and SP carried out the analyses and Fang Li (FL), Chris Coppin (CC), Jennifer Shirriffs (JS) assisted in various parts of the experiment Page | v while JO, AAH, SP, SFL and MS assisted in further analyses, interpretation and writing. Approximately 60% of the work was undertaken by RVR and the manuscript will be submitted for publication during the examination of the thesis. Page | vi Acknowledgements There are so many people I would like to thank for guiding me and helping me through these last few years on an intellectual, practical and emotional level. To my supervisors Ronald Lee, Ary Hoffmann, John Oakeshott and Michele Shiffer, my heartfelt gratitude goes to you for believing in me and giving me the opportunity to explore the research world, for guiding me in my pursuit of science and for your attention and patience throughout. To my committee chair Phil Batterham for his invaluable support and guidance within and beyond research. Also a special thanks to Nancy Endersby-Harshman and Vanessa White for their astute advice and constant support throughout the past few years. I would be lost in this journey without you all! I would also like to thank my collaborators and co-workers (past and present) Stephen Pearce, Alexandre Fournier-Level, Heng-Lin Yeap, Charles Robin, Lars Jermiin, Jen Shiriffs, Lea Rako, Karl Gordon, Tom Walsh, Martin Kapun and the postdocs in the Hoffmann lab for their advice and support and for introducing me to a wealth of information and avenues for my research. The support you all have provided me has greatly enriched my experience as well as knowledge in immeasurable ways. A huge thank you to my fellow lab members, especially Rebecca, Heng, Elf, Alex, Perran, Peter and Xuan as well as the members of the Robin lab Amol, Llew, Sue, Caitlyn and Bec who have shared my journey with me while being the source of many a laughs and intellectually engaging discussions. It would have been a lonely journey without you all! A giant thanks to my family (the Rane and the Srinivasan clans) for always having believed in me and unconditionally supporting me through my life’s journey leading up to this moment. This journey would not have happened without your support. Page | vii Most of all, the biggest thanks to my wife Neerja who has been my steadfast companion through these years with me, patiently supporting me through the thick and thin, celebrating my successes and learning from the non-successes with me and being the perineal source of motivation through this journey. This journey would not have been half as fun without you and I have reached this point thanks to you! Page | viii Table of Contents ABSTRACT ............................................................................................................... II DECLARATION ...................................................................................................... IV PREFACE .................................................................................................................. V ACKNOWLEDGEMENTS .................................................................................... VII CHAPTER 1 ................................................................................................................ 1 INTRODUCTION .......................................................................................................... 1 1.1 Adaptation in response to climate change .......................................................
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