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Genome Sequence of the Basal Haplorrhine Primate Tarsius Syrichta Reveals Unusual Insertions Patrick Minx Washington University School of Medicine in St

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Genome Sequence of the Basal Haplorrhine Primate Tarsius Syrichta Reveals Unusual Insertions Patrick Minx Washington University School of Medicine in St Washington University School of Medicine Digital Commons@Becker Open Access Publications 2016 Genome sequence of the basal haplorrhine primate Tarsius syrichta reveals unusual insertions Patrick Minx Washington University School of Medicine in St. Louis Michael J. Montague Washington University School of Medicine in St. Louis Richard K. Wilson Washington University School of Medicine in St. Louis Wesley C. Warren Washington University School of Medicine in St. Louis et al Follow this and additional works at: https://digitalcommons.wustl.edu/open_access_pubs Recommended Citation Minx, Patrick; Montague, Michael J.; Wilson, Richard K.; Warren, Wesley C.; and et al, ,"Genome sequence of the basal haplorrhine primate Tarsius syrichta reveals unusual insertions." Nature Communications.7,. 12997. (2016). https://digitalcommons.wustl.edu/open_access_pubs/5389 This Open Access Publication is brought to you for free and open access by Digital Commons@Becker. It has been accepted for inclusion in Open Access Publications by an authorized administrator of Digital Commons@Becker. For more information, please contact [email protected]. ARTICLE Received 29 Oct 2015 | Accepted 17 Aug 2016 | Published 6 Oct 2016 DOI: 10.1038/ncomms12997 OPEN Genome sequence of the basal haplorrhine primate Tarsius syrichta reveals unusual insertions Ju¨rgen Schmitz1,2, Angela Noll1,2,3, Carsten A. Raabe1,4, Gennady Churakov1,5, Reinhard Voss6, Martin Kiefmann1, Timofey Rozhdestvensky1,7,Ju¨rgen Brosius1,4, Robert Baertsch8, Hiram Clawson8, Christian Roos3, Aleksey Zimin9, Patrick Minx10, Michael J. Montague10, Richard K. Wilson10 & Wesley C. Warren10 Tarsiers are phylogenetically located between the most basal strepsirrhines and the most derived anthropoid primates. While they share morphological features with both groups, they also possess uncommon primate characteristics, rendering their evolutionary history somewhat obscure. To investigate the molecular basis of such attributes, we present here a new genome assembly of the Philippine tarsier (Tarsius syrichta), and provide extended analyses of the genome and detailed history of transposable element insertion events. We describe the silencing of Alu monomers on the lineage leading to anthropoids, and recognize an unexpected abundance of long terminal repeat-derived and LINE1-mobilized transposed elements (Tarsius interspersed elements; TINEs). For the first time in mammals, we identify a complete mitochondrial genome insertion within the nuclear genome, then reveal tarsier-specific, positive gene selection and posit population size changes over time. The genomic resources and analyses presented here will aid efforts to more fully understand the ancient characteristics of primate genomes. 1 Institute of Experimental Pathology, University of Mu¨nster, 48149 Mu¨nster, Germany. 2 Mu¨nster Graduate School of Evolution, University of Mu¨nster, 48149 Mu¨nster, Germany. 3 Primate Genetics Laboratory, German Primate Center, Leibniz Institute for Primate Research, 37077 Go¨ttingen, Germany. 4 Institute of Evolutionary and Medical Genomics, Brandenburg Medical School (MHB), 16816 Neuruppin, Germany. 5 Institute for Evolution and Biodiversity, University of Mu¨nster, 48149 Mu¨nster, Germany. 6 Integrated Functional Genomics, Interdisciplinary Center for Clinical Research, University of Mu¨nster, 48149 Mu¨nster, Germany. 7 Medical Faculty (TRAM), University of Mu¨nster, 48149 Mu¨nster, Germany. 8 Department of Biomolecular Engineering, University of California, Santa Cruz, California 95064, USA. 9 Institute for Physical Science and Technology, University of Maryland, 3300 Metzerott Rd, Adelphi, Maryland 20783, USA. 10 McDonnell Genome Institute, Washington University School of Medicine, St. Louis, Missouri 63108, USA. Correspondence and requests for materials should be addressed to W.C.W. (email: [email protected]). NATURE COMMUNICATIONS | 7:12997 | DOI: 10.1038/ncomms12997 | www.nature.com/naturecommunications 1 ARTICLE NATURE COMMUNICATIONS | DOI: 10.1038/ncomms12997 arsiers are small nocturnal primates that were, together lucidum, and in contrast to most nocturnal primates, they possess with their presumed sister family, the extinct Omomyidae, dichromatic colour vision18. The primary visual cortex (V1) of Tonce widespread in Asia, Europe and North America, the tarsier brain occupies 21% of the neocortex19, the largest but today populate only insular Southeast Asia1,2. The family proportion among all primates, and this neural architecture is Tarsiidae contains at least ten extant species that are found in the likely important for processing detailed vision in dim light20. Indonesian and Malaysian parts of Borneo, the Indonesian Interestingly, the layered neural morphology of V1 displays a islands Sulawesi, Sumatra and Java as well as Greater Mindanao pronounced differentiation pattern that is most similar to that and surrounding islands of the southern Philippines3. The seen in diurnal callitrichids (for example, marmosets and Philippine tarsiers were recently ascribed the genus Carlito, tamarins), which also rely on insects as a primary nutritional while the tarsiers of Borneo, Sumatra and Java received the genus resource21,22. The distinctive pattern of V1 in tarsiers is in fact name Cephalopachus4. The genus Tarsius was retained for different from night monkeys, the only nocturnal anthropoids, the Sulawesian tarsiers and represents the most speciose of the and strepsirrhines, yet comparable to the pattern found in three genera5. Here we adhere to the traditional designation homologous brain regions of other visual predators, such as Tarsius syrichta. the optic tectum in birds16. Here, we describe an improved Tarsiers occupy a key node in primate phylogeny between genome assembly that highlights the distinguishing features of Strepsirrhini (for example, lemurs, lorises and galagos) and genome organization. Anthropoidea (that is, monkeys and apes, including humans), Among primate genomes, an obvious novelty is the and share morphological features with both groups1. For approximately one million primate-specific Alu retrotransposon instance, like strepsirrhines, tarsiers have an unfused insertions that are spread almost randomly over all mandibular symphysis, molar teeth with high cups, grooming chromosomes. These elements not only expanded the genomic claws, multiple nipples and a bicornuate uterus. On the other space by 410%, but they also reshaped genomic structure, hand, their postorbital closure, absence of a moist rhinarium, notably by influencing gene expression or by providing novel hemochorial placenta and retinal fovea are features shared with protein-coding cassette exons. They are even responsible for anthropoids1. At the same time, tarsiers are characterized by a various disease phenotypes due to insertion mutagenesis, splicing number of features uncommon to primates, including dimensions interference or recombination23. Interestingly, most insertions of the craniofacial skeleton and exceptional anatomy associated and subsequent evolutionary changes were established after the with various sensory organs, and are the only extant primates earliest primate split of strepsirrhines, around 63 million years lacking deciduous incisors, possibly due to genetic substitutions6. ago (Myr ago), which clearly predates the evolution of Compared with all other mammals, tarsiers have the longest anthropoids, around 40 Myr ago24 (for dating see Goodman gestation period (178 days) relative to body size. et al.10). With tarsiers emerging about 55 Myr ago, the formerly Tarsiers possess the greatest number of chromosomes compared inaccessible period of 15 million years is now available for with other primates7. While there are no chromosome painting analysis with this improved genome assembly (for an alternative data available for tarsiers, Tarsiidae exhibit extensive inter-generic dating of primate divergences see Perelman et al.13). Importantly, diversity in terms of chromosome number, given that members of since it provides the key to the most retrotranspositionally active Tarsius possess 46 chromosomes and members of Carlito and time period in primate evolution, another goal was to better Cephalopachus possess 80 chromosomes4. Their evolutionary understand the mechanisms and frequencies of transposon history, as derived from both the fossil record and molecular insertion events. In conjunction with the central phylogenetic characters, remained obscure, especially, as these characters position of tarsiers in the primate tree most of the critical changes supported all extremes of possible positions in the early in transposons took place around the divergence point of tarsiers divergence of primates: as the first split of primates8, in a close on the lineage leading to—and shaping the largest part of—the relationship to strepsirrhines (that is, prosimian monophyly)9,or human genome. Therefore, a comparative and evolutionary in a closer relationship to anthropoids (that is, haplorrhine assessment of the transposable element landscape, which monophyly)10,11. Past molecular reconstructions mistakenly placed comprises at least 44% of the tarsier genome, is central to our tarsiers on a common branch with strepsirrhines12, while most investigation, which we complement with analyses of recent evidence supports haplorrhine monophyly, which places another class of transferred sequences, namely mitochondrial tarsiers as the sister taxon to anthropoids to the exclusion of all nuclear insertions (numts). Our additional analyses
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