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Comparative Transcriptomics of Albino and Warningly Coloured Caterpillars

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Comparative Transcriptomics of Albino and Warningly Coloured Caterpillars bioRxiv preprint doi: https://doi.org/10.1101/336636; this version posted June 2, 2018. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC-ND 4.0 International license. 1! Comparative transcriptomics of albino and warningly coloured caterpillars 2! Juan A. Galarza§. 3! §Centre of Excellence in Biological Interactions. University of Jyväskylä, Finland. 4! e-mail: [email protected] 5! 6! Data deposition. All raw reads and assemblies can be found at National Center for 7! Biotechnology Information (NCBI) under project number PRJNA449279 with accession 8! GGLW00000000. 9! 10! Abstract: 11! 12! Colouration is perhaps one of the most prominent adaptations for survival and reproduction 13! of most taxa. Colouration is of particular importance for aposematic species, which rely on 14! their colouring and patterning to act as a warning signal against predators. Most research has 15! focused on the evolution of warning colouration by natural selection. However, little 16! information is available for colour mutants of aposematic species, particularly at the genomic 17! level. Here I compare the transcriptomes of albino mutant caterpillars of the wood tiger moth 18! (Arctia plantaginis) to those of their full-sibs having their distinctive orange-black warning 19! colouration. The results showed >300 differentially expressed genes transcriptome-wide. 20! Genes involved in the immune system, structural constituents of cuticle, and peptidase 21! activity were mostly down-regulated in the albino larvae. Surprisingly, higher expression was 22! observed in core melanin genes from albino larvae, suggesting that melanin synthesis may be 23! disrupted in terminal ends of the pathway during its final conversion. I further identified 25 24! novel genes uniquely expressed in the albino larvae. Functional annotation showed that these 25! genes are involved in nucleotide biosynthesis, copper ion transmembrane transport, and 26! nucleic acid binding. Taken together, these results suggest that caterpillar albinism may not 27! be due to a depletion of melanin precursor genes. In contrast, the albino condition may result 28! from the combination of faulty melanin conversion late in its synthesis and structural 29! deficiencies in the cuticle preventing its deposition. 30! 31! Keywords: Arctia plantaginis, aposematism, melanin, gene expression 32! 33! 34! 35! 36! 37! 38! ! 1! bioRxiv preprint doi: https://doi.org/10.1101/336636; this version posted June 2, 2018. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC-ND 4.0 International license. 39! Introduction 40! 41! Colouration is perhaps one of the most prominent adaptations for survival and 42! reproduction of most taxa. It serves a variety of functions such as concealment for protection 43! or ambuscading, intra- or inter-specific communication for sexual signalling or 44! advertisement, and regulation of physiological processes such as body temperature (Cott 45! 1940). Colouration can be produced by both, physical (i.e. structural) and chemical (i.e. 46! pigments) means and it can change with ontogeny and/or seasonality. Its research goes 47! beyond the evolutionary/ecological fields by influencing breakthroughs in the design of new 48! materials and technologies (Caro, et al. 2017). 49! 50! Colouration is of particular importance for aposematic species, which rely on their 51! colouring and patterning to act as a warning signal advertising unpalatability to predators 52! (Rowe and Guilford 2000). Such anti-predator adaptation is widespread across plants and 53! animals (Komarek 1998; Mappes, et al. 2005). Most research has focused on the evolution of 54! warning colouration by natural selection where its effectiveness is relative to its intra- inter- 55! specific frequency, and in the context of the predator community (Mappes, et al. 1999; 56! Merilaita and Kaitala 2002; Mochida 2011; Nokelainen, et al. 2014; Papaj and Newsom 57! 2005). At the genomic level, aposematic colouration and patterning have been extensively 58! study, particularly in Lepidoptera (Brower 2013; Dasmahapatra, et al. 2012; Davey, et al. 59! 2016; Mallet 2010; Zhan, et al. 2014). However, almost no genomic information is available 60! for colour mutants in wild populations. This is mainly due to the difficulty of obtaining 61! samples given their very low expected frequencies. 62! ! 2! bioRxiv preprint doi: https://doi.org/10.1101/336636; this version posted June 2, 2018. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC-ND 4.0 International license. 63! Colour mutants provide a rare excellent opportunity to confirm suggested 64! pigmentation mechanisms, and to gain insight on alternative or complementary mechanisms 65! involved in warning colouration and patterning. Mutations that have a major effect, such as a 66! complete absence of pigmentation (i.e. albinism) can provide valuable information. Albinism 67! and leucism (i.e. partial absence of pigmentation) are best studied in humans and other 68! mammals (Crawford, et al. 2017; de Vasconcelos, et al. 2017; Martinez-Garcia and Montoliu 69! 2013; Rothammer, et al. 2017). Nonetheless, such conditions can be found across taxa 70! including fish (Clark 2002; Nobile, et al. 2016), reptiles (Krecsák 2008; Mitchell and Church 71! 2002) and plants (Gettys and Wofford 2007; Us-Camas, et al. 2017) However, little 72! information is available for aposematic species. 73! 74! Here I compare the transcriptomes of albino mutant caterpillars of the wood tiger 75! moth (Arctia plantaginis) to those of their normal coloured siblings having their orange-black 76! warning colouration. I evaluate transcriptome-wide gene expression differences, identify 77! uniquely expressed genes in each condition, and analyse candidate genes from the melanin 78! biosynthesis pathway. A comprehensive annotation of the transcriptomes of both conditions 79! as well as of the differentially expressed and unique genes is provided. These results 80! represent a thorough characterisation of genes and processes associated with the lack of 81! pigmentation in Lepidoptera and are discussed in the context of aposematic strategies. 82! 83! Materials and Methods 84! Study Species 85! 86! The aposematic wood tiger moth is widely distributed throughout the Holarctic. It has 87! one generation per year and adults are sexually dimorphic. Female hindwing colouration ! 3! bioRxiv preprint doi: https://doi.org/10.1101/336636; this version posted June 2, 2018. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC-ND 4.0 International license. 88! varies continuously from orange-red, whereas male hindwing colouration varies within 89! populations from yellow-red in the Caucasus, yellow-white in Europe and Siberia, and black- 90! white in North America and Northern Asia (Hegna, et al. 2015). Caterpillars however, are 91! dichromatic displaying an orange patch against an otherwise dark body. The patch is variable 92! in size and functions as a warning signal against avian predators (Lindstedt, et al. 2008). 93! 94! Wood tiger moths have been reared at the University of Jyväskylä, Finland since 95! 2009. The stock is dynamic (i.e. not permanent selection lines) being supplemented every 96! year with wild-caught adults from which an average of 15000 larvae/year are produced. 97! Albino larvae are rare, with only 8 cases documented showing completely white skin, hairs, 98! and eyes (supplementary material S8). In human nomenclature, these would be referred to as 99! ocolcutaneous (OCA) albinism (Oetting and King 1999). Albino larvae usually die within a 100! few days or, in some cases, regain their warning colouration in the next moult, suggesting 101! that this condition can be lethal or transient. 102! 103! Sample Collection and RNA-Sequencing 104! 105! In this study, one albino larva was collected in summer 2011 and another in summer 106! 2014. Both larvae were F1 from wild-caught parents. En each case, one of their normal 107! coloured full-sibs was collected as well for comparative purposes. All larvae originated from 108! Finnish populations and were in the fourth or fifth instar. They were fed with wild dandelion 109! (Taraxacum spp.) and reared under natural light conditions with an average temperature of 110! 25°C during the day and 15 - 20°C at night. For RNA extraction, larvae were submerged in 111! RNAlater stabilizing solution (Qiagen, Valencia, US.A.) and kept at -20C° until extraction. 112! Total RNA was extracted using RNeasy Mini Kit (Qiagen) according to manufacturer’s ! 4! bioRxiv preprint doi: https://doi.org/10.1101/336636; this version posted June 2, 2018. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC-ND 4.0 International license. 113! instructions with additional TriReagent (MRC, Inc.) and DNase (Qiagen, Valencia, US.A.) 114! treatments. The quality and quantity of total RNA was inspected in a BioAnalyzer 2100 using 115! RNA 6000 Nano Kit (Agilent). Subsequently, mRNA was isolated by means of two isolation 116! cycles using Dynabeads mRNA purification kit (Ambion®) and quantified using RNA 6000 117! Pico Kit in a BioAnalyzer 2100 (Agilent). Pair-end (2 X 100pb) cDNA libraries were 118! constructed for each larva according to Illumina’s TruSeq Stranded HT protocol. The 119! libraries were individually indexed and sequenced in a HiScanSQ sequencer at the DNA 120! sequencing and genomics laboratory of the Institute of Biotechnology at the University of 121! Helsinki, Finland.
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