1
|
Genty G, Sandoval-Castillo J, Beheregaray LB, Möller LM. Into the Blue: Exploring genetic mechanisms behind the evolution of baleen whales. Gene 2024; 929:148822. [PMID: 39103058 DOI: 10.1016/j.gene.2024.148822] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2024] [Revised: 07/29/2024] [Accepted: 08/02/2024] [Indexed: 08/07/2024]
Abstract
Marine ecosystems are ideal for studying evolutionary adaptations involved in lineage diversification due to few physical barriers and reduced opportunities for strict allopatry compared to terrestrial ecosystems. Cetaceans (whales, dolphins, and porpoises) are a diverse group of mammals that successfully adapted to various habitats within the aquatic environment around 50 million years ago. While the overall adaptive transition from terrestrial to fully aquatic species is relatively well understood, the radiation of modern whales is still unclear. Here high-quality genomes derived from previously published data were used to identify genomic regions that potentially underpinned the diversification of baleen whales (Balaenopteridae). A robust molecular phylogeny was reconstructed based on 10,159 single copy and complete genes for eight mysticetes, seven odontocetes and two cetacean outgroups. Analysis of positive selection across 3,150 genes revealed that balaenopterids have undergone numerous idiosyncratic and convergent genomic variations that may explain their diversification. Genes associated with aging, survival and homeostasis were enriched in all species. Additionally, positive selection on genes involved in the immune system were disclosed for the two largest species, blue and fin whales. Such genes can potentially be ascribed to their morphological evolution, allowing them to attain greater length and increased cell number. Further evidence is presented about gene regions that might have contributed to the extensive anatomical changes shown by cetaceans, including adaptation to distinct environments and diets. This study contributes to our understanding of the genomic basis of diversification in baleen whales and the molecular changes linked to their adaptive radiation, thereby enhancing our understanding of cetacean evolution.
Collapse
Affiliation(s)
- Gabrielle Genty
- Cetacean Ecology, Behaviour and Evolution Lab, College of Science and Engineering, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia; Molecular Ecology Lab, College of Science and Engineering, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia.
| | - Jonathan Sandoval-Castillo
- Molecular Ecology Lab, College of Science and Engineering, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia
| | - Luciano B Beheregaray
- Molecular Ecology Lab, College of Science and Engineering, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia
| | - Luciana M Möller
- Cetacean Ecology, Behaviour and Evolution Lab, College of Science and Engineering, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia; Molecular Ecology Lab, College of Science and Engineering, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia
| |
Collapse
|
2
|
Uribe C, Nery MF, Zavala K, Mardones GA, Riadi G, Opazo JC. Evolution of ion channels in cetaceans: a natural experiment in the tree of life. Sci Rep 2024; 14:17024. [PMID: 39043711 PMCID: PMC11266680 DOI: 10.1038/s41598-024-66082-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2024] [Accepted: 06/26/2024] [Indexed: 07/25/2024] Open
Abstract
Cetaceans represent a natural experiment within the tree of life in which a lineage changed from terrestrial to aquatic habitats. This shift involved phenotypic modifications, representing an opportunity to explore the genetic bases of phenotypic diversity. Among the different molecular systems that maintain cellular homeostasis, ion channels are crucial for the proper physiological functioning of all living species. This study aims to explore the evolution of ion channels during the evolutionary history of cetaceans. To do so, we created a bioinformatic pipeline to annotate the repertoire of ion channels in the genome of the species included in our sampling. Our main results show that cetaceans have, on average, fewer protein-coding genes and a higher percentage of annotated ion channels than non-cetacean mammals. Signals of positive selection were detected in ion channels related to the heart, locomotion, visual and neurological phenotypes. Interestingly, we predict that the NaV1.5 ion channel of most toothed whales (odontocetes) is sensitive to tetrodotoxin, similar to NaV1.7, given the presence of tyrosine instead of cysteine, in a specific position of the ion channel. Finally, the gene turnover rate of the cetacean crown group is more than three times faster than that of non-cetacean mammals.
Collapse
Affiliation(s)
- Cristóbal Uribe
- Department of Bioinformatics, Program in Sciences Mention Modeling of Chemical and Biological Systems, School of Bioinformatics Engineering, Center for Bioinformatics, Simulation and Modeling, CBSM, Faculty of Engineering, University of Talca, Campus Talca, Talca, Chile
| | - Mariana F Nery
- Departamento de Genética, Evolução, Microbiologia e Imunologia, Instituto de Biologia, Universidade Estadual de Campinas-UNICAMP, Cidade Universitária, Campinas, Brazil
| | - Kattina Zavala
- Facultad de Medicina y Ciencia, Universidad San Sebastián, Valdivia, Chile
| | - Gonzalo A Mardones
- Facultad de Medicina y Ciencia, Universidad San Sebastián, Valdivia, Chile
- Integrative Biology Group, Valdivia, Chile
| | - Gonzalo Riadi
- Department of Bioinformatics, Center for Bioinformatics, Simulation and Modeling, Faculty of Engineering, CBSM, University of Talca, Talca, Chile.
- Millennium Nucleus of Ion Channel-Associated Diseases (MiNICAD), Valdivia, Chile.
| | - Juan C Opazo
- Facultad de Medicina y Ciencia, Universidad San Sebastián, Valdivia, Chile.
- Integrative Biology Group, Valdivia, Chile.
- Millennium Nucleus of Ion Channel-Associated Diseases (MiNICAD), Valdivia, Chile.
| |
Collapse
|
3
|
Ludington AJ, Hammond JM, Breen J, Deveson IW, Sanders KL. New chromosome-scale genomes provide insights into marine adaptations of sea snakes (Hydrophis: Elapidae). BMC Biol 2023; 21:284. [PMID: 38066641 PMCID: PMC10709897 DOI: 10.1186/s12915-023-01772-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Accepted: 11/20/2023] [Indexed: 12/18/2023] Open
Abstract
BACKGROUND Sea snakes underwent a complete transition from land to sea within the last ~ 15 million years, yet they remain a conspicuous gap in molecular studies of marine adaptation in vertebrates. RESULTS Here, we generate four new annotated sea snake genomes, three of these at chromosome-scale (Hydrophis major, H. ornatus and H. curtus), and perform detailed comparative genomic analyses of sea snakes and their closest terrestrial relatives. Phylogenomic analyses highlight the possibility of near-simultaneous speciation at the root of Hydrophis, and synteny maps show intra-chromosomal variations that will be important targets for future adaptation and speciation genomic studies of this system. We then used a strict screen for positive selection in sea snakes (against a background of seven terrestrial snake genomes) to identify genes over-represented in hypoxia adaptation, sensory perception, immune response and morphological development. CONCLUSIONS We provide the best reference genomes currently available for the prolific and medically important elapid snake radiation. Our analyses highlight the phylogenetic complexity and conserved genome structure within Hydrophis. Positively selected marine-associated genes provide promising candidates for future, functional studies linking genetic signatures to the marine phenotypes of sea snakes and other vertebrates.
Collapse
Affiliation(s)
- Alastair J Ludington
- School of Biological Sciences, The University of Adelaide, Adelaide, SA, 5005, Australia.
| | - Jillian M Hammond
- Genomics and Inherited Disease Program, Garvan Institute of Medical Research, Sydney, NSW, Australia
- Centre for Population Genomics, Garvan Institute of Medical Research and Murdoch Children's Research Institute, Darlinghurst, Australia
| | - James Breen
- Indigenous Genomics, Telethon Kids Institute, Adelaide, Australia
- John Curtin School of Medical Research, College of Health & Medicine, Australian National University, Canberra, Australia
| | - Ira W Deveson
- Genomics and Inherited Disease Program, Garvan Institute of Medical Research, Sydney, NSW, Australia
- Centre for Population Genomics, Garvan Institute of Medical Research and Murdoch Children's Research Institute, Darlinghurst, Australia
- Faculty of Medicine, University of New South Wales, Sydney, NSW, Australia
| | - Kate L Sanders
- School of Biological Sciences, The University of Adelaide, Adelaide, SA, 5005, Australia.
- The South Australian Museum, Adelaide, Australia.
| |
Collapse
|
4
|
Pratt EAL, Beheregaray LB, Fruet P, Tezanos-Pinto G, Bilgmann K, Zanardo N, Diaz-Aguirre F, Secchi ER, Freitas TRO, Möller LM. Genomic Divergence and the Evolution of Ecotypes in Bottlenose Dolphins (Genus Tursiops). Genome Biol Evol 2023; 15:evad199. [PMID: 37935115 PMCID: PMC10655200 DOI: 10.1093/gbe/evad199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Revised: 10/03/2023] [Accepted: 10/14/2023] [Indexed: 11/09/2023] Open
Abstract
Climatic changes have caused major environmental restructuring throughout the world's oceans. Marine organisms have responded to novel conditions through various biological systems, including genomic adaptation. Growing accessibility of next-generation DNA sequencing methods to study nonmodel species has recently allowed genomic changes underlying environmental adaptations to be investigated. This study used double-digest restriction-site associated DNA (ddRAD) sequence data to investigate the genomic basis of ecotype formation across currently recognized species and subspecies of bottlenose dolphins (genus Tursiops) in the Southern Hemisphere. Subspecies-level genomic divergence was confirmed between the offshore common bottlenose dolphin (T. truncatus truncatus) and the inshore Lahille's bottlenose dolphin (T. t. gephyreus) from the southwestern Atlantic Ocean (SWAO). Similarly, subspecies-level divergence is suggested between inshore (eastern Australia) Indo-Pacific bottlenose dolphin (T. aduncus) and the proposed Burrunan dolphin (T. australis) from southern Australia. Inshore bottlenose dolphin lineages generally had lower genomic diversity than offshore lineages, a pattern particularly evident for T. t. gephyreus, which showed exceptionally low diversity. Genomic regions associated with cardiovascular, musculoskeletal, and energy production systems appear to have undergone repeated adaptive evolution in inshore lineages across the Southern Hemisphere. We hypothesize that comparable selective pressures in the inshore environment drove similar adaptive responses in each lineage, supporting parallel evolution of inshore bottlenose dolphins. With climate change altering marine ecosystems worldwide, it is crucial to gain an understanding of the adaptive capacity of local species and populations. Our study provides insights into key adaptive pathways that may be important for the long-term survival of cetaceans and other organisms in a changing marine environment.
Collapse
Affiliation(s)
- Eleanor A L Pratt
- Molecular Ecology Laboratory, College of Science and Engineering, Flinders University, Bedford Park, South Australia, Australia
- Cetacean Ecology, Behaviour and Evolution Laboratory, College of Science and Engineering, Flinders University, Bedford Park, South Australia, Australia
| | - Luciano B Beheregaray
- Molecular Ecology Laboratory, College of Science and Engineering, Flinders University, Bedford Park, South Australia, Australia
| | - Pedro Fruet
- Laboratório de Ecologia e Conservação da Megafauna Marinha (ECOMEGA), Universidade Federal do Rio Grande-FURG, Rio Grande, Brazil
- Museu Oceanográfico Prof. Eliézer de C. Rios, Universidade Federal do Rio Grande-FURG, Rio Grande, Brazil
- Kaosa, Rio Grande, Brazil
| | | | - Kerstin Bilgmann
- Department of Biological Sciences, Macquarie University, North Ryde, New South Wales, Australia
| | - Nikki Zanardo
- Molecular Ecology Laboratory, College of Science and Engineering, Flinders University, Bedford Park, South Australia, Australia
- Cetacean Ecology, Behaviour and Evolution Laboratory, College of Science and Engineering, Flinders University, Bedford Park, South Australia, Australia
- Department of Environment and Water, Adelaide, South Australia, Australia
| | - Fernando Diaz-Aguirre
- Molecular Ecology Laboratory, College of Science and Engineering, Flinders University, Bedford Park, South Australia, Australia
- Cetacean Ecology, Behaviour and Evolution Laboratory, College of Science and Engineering, Flinders University, Bedford Park, South Australia, Australia
| | - Eduardo R Secchi
- Laboratório de Ecologia e Conservação da Megafauna Marinha (ECOMEGA), Universidade Federal do Rio Grande-FURG, Rio Grande, Brazil
- Museu Oceanográfico Prof. Eliézer de C. Rios, Universidade Federal do Rio Grande-FURG, Rio Grande, Brazil
| | - Thales R O Freitas
- Laboratório de Citogenética e Evolução, Departamento de Genética, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Luciana M Möller
- Molecular Ecology Laboratory, College of Science and Engineering, Flinders University, Bedford Park, South Australia, Australia
- Cetacean Ecology, Behaviour and Evolution Laboratory, College of Science and Engineering, Flinders University, Bedford Park, South Australia, Australia
| |
Collapse
|
5
|
Xie QP, Zhan W, Shi JZ, Liu F, Niu BL, He X, Liu M, Wang J, Liang QQ, Xie Y, Xu P, Wang X, Lou B. Whole-genome assembly and annotation for the little yellow croaker (Larimichthys polyactis) provide insights into the evolution of hermaphroditism and gonochorism. Mol Ecol Resour 2023; 23:632-658. [PMID: 36330680 DOI: 10.1111/1755-0998.13731] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2021] [Revised: 10/17/2022] [Accepted: 10/26/2022] [Indexed: 11/06/2022]
Abstract
The evolutionary direction of gonochorism and hermaphroditism is an intriguing mystery to be solved. The special transient hermaphroditic stage makes the little yellow croaker (Larimichthys polyactis) an appealing model for studying hermaphrodite formation. However, the origin and evolutionary relationship between of L. polyactis and Larimichthys crocea, the most famous commercial fish species in East Asia, remain unclear. Here, we report the sequence of the L. polyactis genome, which we found is ~706 Mb long (contig N50 = 1.21 Mb and scaffold N50 = 4.52 Mb) and contains 25,233 protein-coding genes. Phylogenomic analysis suggested that L. polyactis diverged from the common ancestor, L. crocea, approximately 25.4 million years ago. Our high-quality genome assembly enabled comparative genomic analysis, which revealed several within-chromosome rearrangements and translocations, without major chromosome fission or fusion events between the two species. The dmrt1 gene was identified as the male-specific gene in L. polyactis. Transcriptome analysis showed that the expression of dmrt1 and its upstream regulatory gene (rnf183) were both sexually dimorphic. Rnf183, unlike its two paralogues rnf223 and rnf225, is only present in Larimichthys and Lates but not in other teleost species, suggesting that it originated from lineage-specific duplication or was lost in other teleosts. Phylogenetic analysis shows that the hermaphrodite stage in male L. polyactis may be explained by the sequence evolution of dmrt1. Decoding the L. polyactis genome not only provides insight into the genetic underpinnings of hermaphrodite evolution, but also provides valuable information for enhancing fish aquaculture.
Collapse
Affiliation(s)
- Qing-Ping Xie
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Institute of Hydrobiology, Zhejiang Academy of Agricultural Sciences, Hangzhou, China
| | - Wei Zhan
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Institute of Hydrobiology, Zhejiang Academy of Agricultural Sciences, Hangzhou, China
| | - Jian-Zhi Shi
- Novogene Bioinformatics Institute, Beijing, China
| | - Feng Liu
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Institute of Hydrobiology, Zhejiang Academy of Agricultural Sciences, Hangzhou, China
| | - Bao-Long Niu
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Institute of Hydrobiology, Zhejiang Academy of Agricultural Sciences, Hangzhou, China
| | - Xue He
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Institute of Hydrobiology, Zhejiang Academy of Agricultural Sciences, Hangzhou, China
| | - Meng Liu
- Novogene Bioinformatics Institute, Beijing, China
| | - Jing Wang
- Novogene Bioinformatics Institute, Beijing, China
| | - Qi-Qi Liang
- Novogene Bioinformatics Institute, Beijing, China
| | - Yue Xie
- Novogene Bioinformatics Institute, Beijing, China
| | - Peng Xu
- State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University, Xiamen, China
| | - Xu Wang
- Department of Pathobiology, College of Veterinary Medicine, Auburn University, Auburn, Alabama, USA.,Alabama Agricultural Experiment Station, Auburn, Alabama, USA.,The HudsonAlpha Institute for Biotechnology, Huntsville, Alabama, USA
| | - Bao Lou
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-Products, Institute of Hydrobiology, Zhejiang Academy of Agricultural Sciences, Hangzhou, China
| |
Collapse
|
6
|
Chebii VJ, Mpolya EA, Muchadeyi FC, Domelevo Entfellner JB. Genomics of Adaptations in Ungulates. Animals (Basel) 2021; 11:1617. [PMID: 34072591 PMCID: PMC8230064 DOI: 10.3390/ani11061617] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2021] [Revised: 05/22/2021] [Accepted: 05/23/2021] [Indexed: 11/16/2022] Open
Abstract
Ungulates are a group of hoofed animals that have long interacted with humans as essential sources of food, labor, clothing, and transportation. These consist of domesticated, feral, and wild species raised in a wide range of habitats and biomes. Given the diverse and extreme environments inhabited by ungulates, unique adaptive traits are fundamental for fitness. The documentation of genes that underlie their genomic signatures of selection is crucial in this regard. The increasing availability of advanced sequencing technologies has seen the rapid growth of ungulate genomic resources, which offers an exceptional opportunity to understand their adaptive evolution. Here, we summarize the current knowledge on evolutionary genetic signatures underlying the adaptations of ungulates to different habitats.
Collapse
Affiliation(s)
- Vivien J. Chebii
- School of Life Science and Bioengineering, Nelson Mandela Africa Institution of Science and Technology, P.O. Box 447, Arusha, Tanzania;
- Biosciences Eastern and Central Africa, International Livestock Research Institute (BecA-ILRI) Hub, P.O. Box 30709, Nairobi 00100, Kenya;
| | - Emmanuel A. Mpolya
- School of Life Science and Bioengineering, Nelson Mandela Africa Institution of Science and Technology, P.O. Box 447, Arusha, Tanzania;
| | - Farai C. Muchadeyi
- Agricultural Research Council Biotechnology Platform (ARC-BTP), Private Bag X5, Onderstepoort 0110, South Africa;
| | - Jean-Baka Domelevo Entfellner
- Biosciences Eastern and Central Africa, International Livestock Research Institute (BecA-ILRI) Hub, P.O. Box 30709, Nairobi 00100, Kenya;
| |
Collapse
|
7
|
Senevirathna JDM, Asakawa S. Multi-Omics Approaches and Radiation on Lipid Metabolism in Toothed Whales. Life (Basel) 2021; 11:364. [PMID: 33923876 PMCID: PMC8074237 DOI: 10.3390/life11040364] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2021] [Revised: 04/09/2021] [Accepted: 04/17/2021] [Indexed: 11/25/2022] Open
Abstract
Lipid synthesis pathways of toothed whales have evolved since their movement from the terrestrial to marine environment. The synthesis and function of these endogenous lipids and affecting factors are still little understood. In this review, we focused on different omics approaches and techniques to investigate lipid metabolism and radiation impacts on lipids in toothed whales. The selected literature was screened, and capacities, possibilities, and future approaches for identifying unusual lipid synthesis pathways by omics were evaluated. Omics approaches were categorized into the four major disciplines: lipidomics, transcriptomics, genomics, and proteomics. Genomics and transcriptomics can together identify genes related to unique lipid synthesis. As lipids interact with proteins in the animal body, lipidomics, and proteomics can correlate by creating lipid-binding proteome maps to elucidate metabolism pathways. In lipidomics studies, recent mass spectroscopic methods can address lipid profiles; however, the determination of structures of lipids are challenging. As an environmental stress, the acoustic radiation has a significant effect on the alteration of lipid profiles. Radiation studies in different omics approaches revealed the necessity of multi-omics applications. This review concluded that a combination of many of the omics areas may elucidate the metabolism of lipids and possible hazards on lipids in toothed whales by radiation.
Collapse
Affiliation(s)
- Jayan D. M. Senevirathna
- Laboratory of Aquatic Molecular Biology and Biotechnology, Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo 113-8657, Japan;
- Department of Animal Science, Faculty of Animal Science and Export Agriculture, Uva Wellassa University, Badulla 90000, Sri Lanka
| | - Shuichi Asakawa
- Laboratory of Aquatic Molecular Biology and Biotechnology, Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo 113-8657, Japan;
| |
Collapse
|
8
|
Lam EK, Allen KN, Torres-Velarde JM, Vázquez-Medina JP. Functional Studies with Primary Cells Provide a System for Genome-to-Phenome Investigations in Marine Mammals. Integr Comp Biol 2020; 60:348-360. [PMID: 32516367 DOI: 10.1093/icb/icaa065] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Marine mammals exhibit some of the most dramatic physiological adaptations in their clade and offer unparalleled insights into the mechanisms driving convergent evolution on relatively short time scales. Some of these adaptations, such as extreme tolerance to hypoxia and prolonged food deprivation, are uncommon among most terrestrial mammals and challenge established metabolic principles of supply and demand balance. Non-targeted omics studies are starting to uncover the genetic foundations of such adaptations, but tools for testing functional significance in these animals are currently lacking. Cellular modeling with primary cells represents a powerful approach for elucidating the molecular etiology of physiological adaptation, a critical step in accelerating genome-to-phenome studies in organisms in which transgenesis is impossible (e.g., large-bodied, long-lived, fully aquatic, federally protected species). Gene perturbation studies in primary cells can directly evaluate whether specific mutations, gene loss, or duplication confer functional advantages such as hypoxia or stress tolerance in marine mammals. Here, we summarize how genetic and pharmacological manipulation approaches in primary cells have advanced mechanistic investigations in other non-traditional mammalian species, and highlight the need for such investigations in marine mammals. We also provide key considerations for isolating, culturing, and conducting experiments with marine mammal cells under conditions that mimic in vivo states. We propose that primary cell culture is a critical tool for conducting functional mechanistic studies (e.g., gene knockdown, over-expression, or editing) that can provide the missing link between genome- and organismal-level understanding of physiological adaptations in marine mammals.
Collapse
Affiliation(s)
- Emily K Lam
- Department of Integrative Biology, University of California, Berkeley, Berkeley, CA 94720, USA
| | - Kaitlin N Allen
- Department of Integrative Biology, University of California, Berkeley, Berkeley, CA 94720, USA
| | | | | |
Collapse
|
9
|
McGowen MR, Tsagkogeorga G, Williamson J, Morin PA, Rossiter ASJ. Positive Selection and Inactivation in the Vision and Hearing Genes of Cetaceans. Mol Biol Evol 2020; 37:2069-2083. [DOI: 10.1093/molbev/msaa070] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Abstract
The transition to an aquatic lifestyle in cetaceans (whales and dolphins) resulted in a radical transformation in their sensory systems. Toothed whales acquired specialized high-frequency hearing tied to the evolution of echolocation, whereas baleen whales evolved low-frequency hearing. More generally, all cetaceans show adaptations for hearing and seeing underwater. To determine the extent to which these phenotypic changes have been driven by molecular adaptation, we performed large-scale targeted sequence capture of 179 sensory genes across the Cetacea, incorporating up to 54 cetacean species from all major clades as well as their closest relatives, the hippopotamuses. We screened for positive selection in 167 loci related to vision and hearing and found that the diversification of cetaceans has been accompanied by pervasive molecular adaptations in both sets of genes, including several loci implicated in nonsyndromic hearing loss. Despite these findings, however, we found no direct evidence of positive selection at the base of odontocetes coinciding with the origin of echolocation, as found in studies examining fewer taxa. By using contingency tables incorporating taxon- and gene-based controls, we show that, although numbers of positively selected hearing and nonsyndromic hearing loss genes are disproportionately high in cetaceans, counts of vision genes do not differ significantly from expected values. Alongside these adaptive changes, we find increased evidence of pseudogenization of genes involved in cone-mediated vision in mysticetes and deep-diving odontocetes.
Collapse
Affiliation(s)
- Michael R McGowen
- School of Biological and Chemical Sciences, Queen Mary, University of London, London, United Kingdom
- Department of Vertebrate Zoology, Smithsonian National Museum of Natural History, Washington, DC
| | - Georgia Tsagkogeorga
- School of Biological and Chemical Sciences, Queen Mary, University of London, London, United Kingdom
| | - Joseph Williamson
- School of Biological and Chemical Sciences, Queen Mary, University of London, London, United Kingdom
| | - Phillip A Morin
- Southwest Fisheries Science Center, National Marine Fisheries Service, NOAA, La Jolla, CA
| | - and Stephen J Rossiter
- School of Biological and Chemical Sciences, Queen Mary, University of London, London, United Kingdom
| |
Collapse
|
10
|
Hindle AG. Diving deep: understanding the genetic components of hypoxia tolerance in marine mammals. J Appl Physiol (1985) 2020; 128:1439-1446. [PMID: 32324472 DOI: 10.1152/japplphysiol.00846.2019] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
Marine mammals have highly specialized physiology, exhibited in many species by extreme breath-holding capabilities that allow deep dives and extended submergence. Cardiovascular control and cell-level hypoxia tolerance are key features of this phenotype. Identifying genomic signatures tied to physiology will be valuable in understanding these natural model species, which may generate translational opportunities to human diseases arising from hypoxic stress or tissue injury. Genomic analyses have now been conducted in dolphins, river dolphins, minke whales, bowhead whales, and polar bears, with multispecies studies exploring evolutionary signals across marine mammal lineages, encompassing extinct and extant divers. Single-species genome studies for sirenians do not yet exist. Extant marine mammals arose in three lineages from separate aquatic recolonizations. Their physiological specializations, along with these independent origins create an interesting case to examine convergent evolution. Although molecular mechanisms of hypoxia tolerance are not universally apparent across marine mammal genomic studies, altered evolutionary rates have been identified for genes linked to oxygen binding and transport (e.g., MB, HBA, and HBB), blood pressure control (e.g., endothelin pathway genes), and cell protection in multiple species. Despite convergent phenotypes across clades, instances of identical molecular convergence have been uncommon. Given the inherent logistical and regulatory difficulties associated with functional genetic experiments in marine mammals, several avenues of further investigation are suggested to enable validation of candidate genes for hypoxia tolerance: leveraging phylogeny to better understand convergent phenotypes; ontogenic studies to identify regulation of key genes underlying the elite, adult, hypoxia-tolerant physiology; and cell culture manipulations to understand gene function.
Collapse
Affiliation(s)
- Allyson G Hindle
- School of Life Sciences, University of Nevada, Las Vegas, Nevada
| |
Collapse
|
11
|
Mancia A. On the revolution of cetacean evolution. Mar Genomics 2018; 41:1-5. [PMID: 30154054 DOI: 10.1016/j.margen.2018.08.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2018] [Revised: 08/21/2018] [Accepted: 08/21/2018] [Indexed: 01/13/2023]
Abstract
The order of Cetacea with 88 species including Odontoceti (or toothed whales) and Mysticeti (or baleen whales) is the most specialized and diversified group of mammals. The blue whale with a maximum recorded length of 29.9 m for 173 t of weight is the largest animal known to have ever existed, and any dolphin's brain is most powerful and complex than any other brain in the animal kingdom, second only to primate's. Nevertheless, Cetacea are mammals that re-entered the oceans only a little over 50 million years ago, a relatively short time on the evolutionary scale. During this time cetaceans and humans have developed marked morphological and behavioral differences, yet their genomes show a high level of similarity. This present review is focused on the description and significance of newly accessible cetacean genome tools and information, and their relevance in the study of the evolution of successful phenotypic adaptations associated to mammal's marine existence, and their applicability to the unresolved disease mechanisms in humans.
Collapse
Affiliation(s)
- Annalaura Mancia
- University of Ferrara, Department of Life Sciences and Biotechnology, Ferrara 44121, Italy.
| |
Collapse
|
12
|
Endo Y, Kamei KI, Inoue-Murayama M. Genetic signatures of lipid metabolism evolution in Cetacea since the divergence from terrestrial ancestor. J Evol Biol 2018; 31:1655-1665. [DOI: 10.1111/jeb.13361] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Revised: 07/12/2018] [Accepted: 07/28/2018] [Indexed: 12/25/2022]
Affiliation(s)
| | - Ken-ichiro Kamei
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS); Kyoto University; Kyoto Japan
| | - Miho Inoue-Murayama
- Wildlife Research Center; Kyoto University; Kyoto Japan
- Wildlife Genome Collaborative Research Group; National Institute for Environmental Studies; Tsukuba Ibaraki Japan
| |
Collapse
|
13
|
Autenrieth M, Hartmann S, Lah L, Roos A, Dennis AB, Tiedemann R. High-quality whole-genome sequence of an abundant Holarctic odontocete, the harbour porpoise (Phocoena phocoena). Mol Ecol Resour 2018; 18:1469-1481. [PMID: 30035363 DOI: 10.1111/1755-0998.12932] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Revised: 07/04/2018] [Accepted: 07/05/2018] [Indexed: 11/27/2022]
Abstract
The harbour porpoise (Phocoena phocoena) is a highly mobile cetacean found across the Northern hemisphere. It occurs in coastal waters and inhabits basins that vary broadly in salinity, temperature and food availability. These diverse habitats could drive subtle differentiation among populations, but examination of this would be best conducted with a robust reference genome. Here, we report the first harbour porpoise genome, assembled de novo from an individual originating in the Kattegat Sea (Sweden). The genome is one of the most complete cetacean genomes currently available, with a total size of 2.39 Gb and 50% of the total length found in just 34 scaffolds. Using 122 of the longest scaffolds, we were able to show high levels of synteny with the genome of the domestic cattle (Bos taurus). Our draft annotation comprises 22,154 predicted genes, which we further annotated through matches to the NCBI nucleotide database, GO categorization and motif prediction. Within the predicted genes, we have confirmed the presence of >20 genes or gene families that have been associated with adaptive evolution in other cetaceans. Overall, this genome assembly and draft annotation represent a crucial addition to the genomic resources currently available for the study of porpoises and Phocoenidae evolution, phylogeny and conservation.
Collapse
Affiliation(s)
- Marijke Autenrieth
- Institute of Biochemistry and Biology, Evolutionary Biology/Systematic Zoology, University of Potsdam, Potsdam, Germany
| | - Stefanie Hartmann
- Institute of Biochemistry and Biology, Evolutionary Adaptive Genomics, University of Potsdam, Potsdam, Germany
| | - Ljerka Lah
- Institute of Biochemistry and Biology, Evolutionary Biology/Systematic Zoology, University of Potsdam, Potsdam, Germany
| | - Anna Roos
- Swedish Museum of Natural History, Stockholm, Sweden
| | - Alice B Dennis
- Institute of Biochemistry and Biology, Evolutionary Biology/Systematic Zoology, University of Potsdam, Potsdam, Germany
| | - Ralph Tiedemann
- Institute of Biochemistry and Biology, Evolutionary Biology/Systematic Zoology, University of Potsdam, Potsdam, Germany
| |
Collapse
|
14
|
Ming Y, Jian J, Yu F, Yu X, Wang J, Liu W. Molecular footprints of inshore aquatic adaptation in Indo-Pacific humpback dolphin (Sousa chinensis). Genomics 2018; 111:1034-1042. [PMID: 30031902 DOI: 10.1016/j.ygeno.2018.07.015] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2018] [Revised: 06/28/2018] [Accepted: 07/17/2018] [Indexed: 11/19/2022]
Abstract
The Indo-Pacific humpback dolphin, Sousa chinensis, being a member of cetaceans, had fully adapted to inshore waters. As a threatened marine mammal, little molecular information available for understanding the genetic basis of ecological adaptation. We firstly sequenced and obtained the draft genome map of S. chinensis. Phylogenetic analysis in this study, based on the single copy orthologous genes of the draft genome, is consistent with traditional phylogenetic classification. The comparative genomic analysis indicated that S. chinensis had 494 species-specific gene families, which involved immune, DNA repair and sensory systems associated with the potential adaption mechanism. We also identified the expansion and positive selection genes in S. chinensis lineage to investigate the potential adaptation mechanism. Our study provided the potential insight into the molecular bases of ecological adaptation in Indo-Pacific humpback dolphin and will be also valuable for future understanding the ecological adaptation and evolution of cetaceans at the genomic level.
Collapse
Affiliation(s)
- Yao Ming
- Marine Biology Institute, Shantou University, Shantou, Guangdong 515063, PR China.
| | - Jianbo Jian
- Marine Biology Institute, Shantou University, Shantou, Guangdong 515063, PR China.
| | - Fei Yu
- Marine Biology Institute, Shantou University, Shantou, Guangdong 515063, PR China.
| | - Xueying Yu
- Guangxi Key Laboratory of Marine Disaster in the Beibu Gulf,Qinzhou University, Qinzhou, Guangxi 535011, PR China.
| | - Jingzhen Wang
- Guangxi Key Laboratory of Marine Disaster in the Beibu Gulf,Qinzhou University, Qinzhou, Guangxi 535011, PR China.
| | - Wenhua Liu
- Marine Biology Institute, Shantou University, Shantou, Guangdong 515063, PR China.
| |
Collapse
|
15
|
Mitterboeck TF, Liu S, Adamowicz SJ, Fu J, Zhang R, Song W, Meusemann K, Zhou X. Positive and relaxed selection associated with flight evolution and loss in insect transcriptomes. Gigascience 2018; 6:1-14. [PMID: 29020740 PMCID: PMC5632299 DOI: 10.1093/gigascience/gix073] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2017] [Accepted: 08/01/2017] [Indexed: 12/31/2022] Open
Abstract
The evolution of powered flight is a major innovation that has facilitated the success of insects. Previously, studies of birds, bats, and insects have detected molecular signatures of differing selection regimes in energy-related genes associated with flight evolution and/or loss. Here, using DNA sequences from more than 1000 nuclear and mitochondrial protein-coding genes obtained from insect transcriptomes, we conduct a broader exploration of which gene categories display positive and relaxed selection at the origin of flight as well as with multiple independent losses of flight. We detected a number of categories of nuclear genes more often under positive selection in the lineage leading to the winged insects (Pterygota), related to catabolic processes such as proteases, as well as splicing-related genes. Flight loss was associated with relaxed selection signatures in splicing genes, mirroring the results for flight evolution. Similar to previous studies of flight loss in various animal taxa, we observed consistently higher nonsynonymous-to-synonymous substitution ratios in mitochondrial genes of flightless lineages, indicative of relaxed selection in energy-related genes. While oxidative phosphorylation genes were not detected as being under selection with the origin of flight specifically, they were most often detected as being under positive selection in holometabolous (complete metamorphosis) insects as compared with other insect lineages. This study supports some convergence in gene-specific selection pressures associated with flight ability, and the exploratory analysis provided some new insights into gene categories potentially associated with the gain and loss of flight in insects.
Collapse
Affiliation(s)
- T Fatima Mitterboeck
- Department of Integrative Biology, University of Guelph, 50 Stone Road East, Guelph, ON, N1G 2W1 Canada.,Biodiversity Institute of Ontario, University of Guelph, 50 Stone Road East, Guelph, ON, N1G 2W1 Canada
| | - Shanlin Liu
- BGI-Shenzhen, Beishan Industrial Zone, Yantian District, Shenzhen, Guangdong Province, 518083 China.,Centre for GeoGenetics, Natural History Museum of Denmark, University of Copenhagen, Øster Voldgade 5-7, 1350 Copenhagen, Denmark
| | - Sarah J Adamowicz
- Department of Integrative Biology, University of Guelph, 50 Stone Road East, Guelph, ON, N1G 2W1 Canada.,Biodiversity Institute of Ontario, University of Guelph, 50 Stone Road East, Guelph, ON, N1G 2W1 Canada
| | - Jinzhong Fu
- Department of Integrative Biology, University of Guelph, 50 Stone Road East, Guelph, ON, N1G 2W1 Canada
| | - Rui Zhang
- BGI-Shenzhen, Beishan Industrial Zone, Yantian District, Shenzhen, Guangdong Province, 518083 China
| | - Wenhui Song
- BGI-Shenzhen, Beishan Industrial Zone, Yantian District, Shenzhen, Guangdong Province, 518083 China
| | - Karen Meusemann
- University of Freiburg, Department for Biology I (Zoology), Evolutionary Biology and Ecology, Hauptstr. 1, D-79104 Freiburg, Germany.,Center for Molecular Biodiversity Research, Zoological Research Museum Alexander Koenig, Adenauerallee 160, 53113 Bonn, Germany.,Australian National Insect Collection CSIRO, Natl Collections & Marine Infrastructure, Clunies Ross Street, ACTON, 2601 ACT, Canberra, Australia
| | - Xin Zhou
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, China Agricultural University, 2 West Yuanmingyuan Rd., Haidian District, Beijing 100193, China.,College of Plant Protection, China Agricultural University, 2 West Yuanmingyuan Rd., Haidian District, Beijing 100193, China
| |
Collapse
|
16
|
Abstract
With the wide application of DNA sequencing technology, DNA sequences are still increasingly generated through the Sanger sequencing platform. SeqMan (in the LaserGene package) is an excellent program with an easy-to-use graphical user interface (GUI) employed to assemble Sanger sequences into contigs. However, with increasing data size, larger sample sets and more sequenced loci make contig assemble complicated due to the considerable number of manual operations required to run SeqMan. Here, we present the 'autoSeqMan' software program, which can automatedly assemble contigs using SeqMan scripting language. There are two main modules available, namely, 'Classification' and 'Assembly'. Classification first undertakes preprocessing work, whereas Assembly generates a SeqMan script to consecutively assemble contigs for the classified files. Through comparison with manual operation, we showed that autoSeqMan saved substantial time in the preprocessing and assembly of Sanger sequences. We hope this tool will be useful for those with large sample sets to analyze, but with little programming experience. It is freely available at https://github.com/ Sun-Yanbo/autoSeqMan.
Collapse
Affiliation(s)
- Jie-Qiong Jin
- State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming Yunnan 650223, China.
| | - Yan-Bo Sun
- State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming Yunnan 650223, China.
| |
Collapse
|
17
|
Abstract
Omics technologies have been developed in recent decades and applied to different subjects, although the greatest advancements have been achieved in human biology and disease. Genome sequencing and the exploration of its coding and noncoding regions are rapidly yielding meaningful answers to diverse questions, relating genome information to protein activity to environmental changes. In the past, marine mammal genetic and transcriptional studies have been restricted due to the lack of reference genomes. But the advance of high-throughput sequencing is revolutionizing the life sciences technologies. As long-lived organisms, at the top of the food chain, marine mammals play an important role in marine ecosystems and while their protected status is in favor of conservation of the species, it also complicates the researcher's approach to traditional measurements of health. Omics data generated by high-throughput technologies will represent an important key for improving the scientific basis for understanding both marine mammal and environment health.
Collapse
|
18
|
Tian R, Yin D, Liu Y, Seim I, Xu S, Yang G. Adaptive Evolution of Energy Metabolism-Related Genes in Hypoxia-Tolerant Mammals. Front Genet 2017; 8:205. [PMID: 29270192 PMCID: PMC5725996 DOI: 10.3389/fgene.2017.00205] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2017] [Accepted: 11/24/2017] [Indexed: 01/26/2023] Open
Abstract
Animals that are able to sustain life under hypoxic conditions have long captured the imagination of biologists and medical practitioners alike. Although the associated morphological modifications have been extensively described, the mechanisms underlying the evolution of hypoxia tolerance are not well understood. To provide such insights, we investigated genes in four major energy metabolism pathways, and provide evidence of distinct evolutionary paths to mammalian hypoxia-tolerance. Positive selection of genes in the oxidative phosphorylation pathway mainly occurred in terrestrial hypoxia-tolerant species; possible adaptations to chronically hypoxic environments. The strongest candidate for positive selection along cetacean lineages was the citrate cycle signaling pathway, suggestive of enhanced aerobic metabolism during and after a dive. Six genes with cetacean-specific amino acid changes are rate-limiting enzymes involved in the gluconeogenesis pathway, which would be expected to enhance the lactate removal after diving. Intriguingly, 38 parallel amino acid substitutions in 29 genes were observed between hypoxia-tolerant mammals. Of these, 76.3% were radical amino acid changes, suggesting that convergent molecular evolution drives the adaptation to hypoxic stress and similar phenotypic changes. This study provides further insights into life under low oxygen conditions and the evolutionary trajectories of hypoxia-tolerant species.
Collapse
Affiliation(s)
- Ran Tian
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, College of Life Sciences, Nanjing Normal University, Nanjing, China
| | - Daiqing Yin
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, College of Life Sciences, Nanjing Normal University, Nanjing, China
| | - Yanzhi Liu
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, College of Life Sciences, Nanjing Normal University, Nanjing, China
| | - Inge Seim
- Comparative and Endocrine Biology Laboratory, Translational Research Institute–Institute of Health and Biomedical Innovation, School of Biomedical Sciences, Queensland University of Technology, Brisbane, QLD, Australia
| | - Shixia Xu
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, College of Life Sciences, Nanjing Normal University, Nanjing, China
| | - Guang Yang
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, College of Life Sciences, Nanjing Normal University, Nanjing, China
| |
Collapse
|
19
|
Brown TM, Hammond SA, Behsaz B, Veldhoen N, Birol I, Helbing CC. De novo assembly of the ringed seal (Pusa hispida) blubber transcriptome: A tool that enables identification of molecular health indicators associated with PCB exposure. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2017; 185:48-57. [PMID: 28187360 DOI: 10.1016/j.aquatox.2017.02.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2016] [Revised: 02/02/2017] [Accepted: 02/03/2017] [Indexed: 06/06/2023]
Abstract
The ringed seal, Pusa hispida, is a keystone species in the Arctic marine ecosystem, and is proving a useful marine mammal for linking polychlorinated biphenyl (PCB) exposure to toxic injury. We report here the first de novo assembled transcriptome for the ringed seal (342,863 transcripts, of which 53% were annotated), which we then applied to a population of ringed seals exposed to a local PCB source in Arctic Labrador, Canada. We found an indication of energy metabolism imbalance in local ringed seals (n=4), and identified five significant gene transcript targets: plasminogen receptor (Plg-R(KT)), solute carrier family 25 member 43 receptor (Slc25a43), ankyrin repeat domain-containing protein 26-like receptor (Ankrd26), HIS30 (not yet annotated) and HIS16 (not yet annotated) that may represent indicators of PCB exposure and effects in marine mammals. The abundance profiles of these five gene targets were validated in blubber samples collected from 43 ringed seals using a qPCR assay. The mRNA transcript levels for all five gene targets, (Plg-R(KT), r2=0.43), (Slc25a43, r2=0.51), (Ankrd26, r2=0.43), (HIS30, r2=0.39) and (HIS16, r2=0.31) correlated with increasing levels of blubber PCBs. Results from the present study contribute to our understanding of PCB associated effects in marine mammals, and provide new tools for future molecular and toxicology work in pinnipeds.
Collapse
Affiliation(s)
- Tanya M Brown
- Department of Biochemistry and Microbiology, University of Victoria, Victoria, British Columbia V8W 3P6, Canada; Memorial University, St. John's, Newfoundland A1B 3X9, Canada
| | - S Austin Hammond
- Department of Biochemistry and Microbiology, University of Victoria, Victoria, British Columbia V8W 3P6, Canada; Canada's Michael Smith Genome Sciences Centre, British Columbia Cancer Agency, Vancouver, BC V5Z 4S6, Canada
| | - Bahar Behsaz
- Canada's Michael Smith Genome Sciences Centre, British Columbia Cancer Agency, Vancouver, BC V5Z 4S6, Canada
| | - Nik Veldhoen
- Department of Biochemistry and Microbiology, University of Victoria, Victoria, British Columbia V8W 3P6, Canada
| | - Inanç Birol
- Canada's Michael Smith Genome Sciences Centre, British Columbia Cancer Agency, Vancouver, BC V5Z 4S6, Canada
| | - Caren C Helbing
- Department of Biochemistry and Microbiology, University of Victoria, Victoria, British Columbia V8W 3P6, Canada.
| |
Collapse
|
20
|
Mitterboeck TF, Chen AY, Zaheer OA, Ma EYT, Adamowicz SJ. Do saline taxa evolve faster? Comparing relative rates of molecular evolution between freshwater and marine eukaryotes. Evolution 2016; 70:1960-78. [PMID: 27402284 DOI: 10.1111/evo.13000] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2015] [Revised: 05/24/2016] [Accepted: 06/28/2016] [Indexed: 12/16/2022]
Abstract
The major branches of life diversified in the marine realm, and numerous taxa have since transitioned between marine and freshwaters. Previous studies have demonstrated higher rates of molecular evolution in crustaceans inhabiting continental saline habitats as compared with freshwaters, but it is unclear whether this trend is pervasive or whether it applies to the marine environment. We employ the phylogenetic comparative method to investigate relative molecular evolutionary rates between 148 pairs of marine or continental saline versus freshwater lineages representing disparate eukaryote groups, including bony fish, elasmobranchs, cetaceans, crustaceans, mollusks, annelids, algae, and other eukaryotes, using available protein-coding and noncoding genes. Overall, we observed no consistent pattern in nucleotide substitution rates linked to habitat across all genes and taxa. However, we observed some trends of higher evolutionary rates within protein-coding genes in freshwater taxa-the comparisons mainly involving bony fish-compared with their marine relatives. The results suggest no systematic differences in substitution rate between marine and freshwater organisms.
Collapse
Affiliation(s)
- T Fatima Mitterboeck
- Biodiversity Institute of Ontario, University of Guelph, Guelph, Ontario, N1G 2W1, Canada. .,Department of Integrative Biology, University of Guelph, Guelph, Ontario, N1G 2W1, Canada.
| | - Alexander Y Chen
- Biodiversity Institute of Ontario, University of Guelph, Guelph, Ontario, N1G 2W1, Canada.,Department of Integrative Biology, University of Guelph, Guelph, Ontario, N1G 2W1, Canada
| | - Omar A Zaheer
- Biodiversity Institute of Ontario, University of Guelph, Guelph, Ontario, N1G 2W1, Canada.,Department of Integrative Biology, University of Guelph, Guelph, Ontario, N1G 2W1, Canada
| | - Eddie Y T Ma
- Biodiversity Institute of Ontario, University of Guelph, Guelph, Ontario, N1G 2W1, Canada.,Department of Integrative Biology, University of Guelph, Guelph, Ontario, N1G 2W1, Canada.,School of Computer Science, University of Guelph, Guelph, Ontario, N1G 2W1, Canada
| | - Sarah J Adamowicz
- Biodiversity Institute of Ontario, University of Guelph, Guelph, Ontario, N1G 2W1, Canada.,Department of Integrative Biology, University of Guelph, Guelph, Ontario, N1G 2W1, Canada
| |
Collapse
|
21
|
Chikina M, Robinson JD, Clark NL. Hundreds of Genes Experienced Convergent Shifts in Selective Pressure in Marine Mammals. Mol Biol Evol 2016; 33:2182-92. [PMID: 27329977 DOI: 10.1093/molbev/msw112] [Citation(s) in RCA: 97] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Mammal species have made the transition to the marine environment several times, and their lineages represent one of the classical examples of convergent evolution in morphological and physiological traits. Nevertheless, the genetic mechanisms of their phenotypic transition are poorly understood, and investigations into convergence at the molecular level have been inconclusive. While past studies have searched for convergent changes at specific amino acid sites, we propose an alternative strategy to identify those genes that experienced convergent changes in their selective pressures, visible as changes in evolutionary rate specifically in the marine lineages. We present evidence of widespread convergence at the gene level by identifying parallel shifts in evolutionary rate during three independent episodes of mammalian adaptation to the marine environment. Hundreds of genes accelerated their evolutionary rates in all three marine mammal lineages during their transition to aquatic life. These marine-accelerated genes are highly enriched for pathways that control recognized functional adaptations in marine mammals, including muscle physiology, lipid-metabolism, sensory systems, and skin and connective tissue. The accelerations resulted from both adaptive evolution as seen in skin and lung genes, and loss of function as in gustatory and olfactory genes. In regard to sensory systems, this finding provides further evidence that reduced senses of taste and smell are ubiquitous in marine mammals. Our analysis demonstrates the feasibility of identifying genes underlying convergent organism-level characteristics on a genome-wide scale and without prior knowledge of adaptations, and provides a powerful approach for investigating the physiological functions of mammalian genes.
Collapse
Affiliation(s)
- Maria Chikina
- Department of Computational and Systems Biology, University of Pittsburgh
| | - Joseph D Robinson
- Department of Molecular and Cell Biology, University of California Berkeley
| | - Nathan L Clark
- Department of Computational and Systems Biology, University of Pittsburgh
| |
Collapse
|
22
|
Yang J, Chen X, Bai J, Fang D, Qiu Y, Jiang W, Yuan H, Bian C, Lu J, He S, Pan X, Zhang Y, Wang X, You X, Wang Y, Sun Y, Mao D, Liu Y, Fan G, Zhang H, Chen X, Zhang X, Zheng L, Wang J, Cheng L, Chen J, Ruan Z, Li J, Yu H, Peng C, Ma X, Xu J, He Y, Xu Z, Xu P, Wang J, Yang H, Wang J, Whitten T, Xu X, Shi Q. The Sinocyclocheilus cavefish genome provides insights into cave adaptation. BMC Biol 2016; 14:1. [PMID: 26728391 PMCID: PMC4698820 DOI: 10.1186/s12915-015-0223-4] [Citation(s) in RCA: 135] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2015] [Accepted: 12/17/2015] [Indexed: 01/25/2023] Open
Abstract
BACKGROUND An emerging cavefish model, the cyprinid genus Sinocyclocheilus, is endemic to the massive southwestern karst area adjacent to the Qinghai-Tibetan Plateau of China. In order to understand whether orogeny influenced the evolution of these species, and how genomes change under isolation, especially in subterranean habitats, we performed whole-genome sequencing and comparative analyses of three species in this genus, S. grahami, S. rhinocerous and S. anshuiensis. These species are surface-dwelling, semi-cave-dwelling and cave-restricted, respectively. RESULTS The assembled genome sizes of S. grahami, S. rhinocerous and S. anshuiensis are 1.75 Gb, 1.73 Gb and 1.68 Gb, respectively. Divergence time and population history analyses of these species reveal that their speciation and population dynamics are correlated with the different stages of uplifting of the Qinghai-Tibetan Plateau. We carried out comparative analyses of these genomes and found that many genetic changes, such as gene loss (e.g. opsin genes), pseudogenes (e.g. crystallin genes), mutations (e.g. melanogenesis-related genes), deletions (e.g. scale-related genes) and down-regulation (e.g. circadian rhythm pathway genes), are possibly associated with the regressive features (such as eye degeneration, albinism, rudimentary scales and lack of circadian rhythms), and that some gene expansion (e.g. taste-related transcription factor gene) may point to the constructive features (such as enhanced taste buds) which evolved in these cave fishes. CONCLUSION As the first report on cavefish genomes among distinct species in Sinocyclocheilus, our work provides not only insights into genetic mechanisms of cave adaptation, but also represents a fundamental resource for a better understanding of cavefish biology.
Collapse
Affiliation(s)
- Junxing Yang
- State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, 650223, China.
| | | | - Jie Bai
- BGI-Shenzhen, Shenzhen, 518083, China. .,Shenzhen Key Lab of Marine Genomics, State Key Laboratory of Agricultural Genomics, Shenzhen, 518083, China. .,Fauna & Flora International, Cambridge, CB1 2JD, UK.
| | - Dongming Fang
- BGI-Shenzhen, Shenzhen, 518083, China. .,Agricultural Genomes Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, 518120, China.
| | - Ying Qiu
- BGI-Shenzhen, Shenzhen, 518083, China. .,Shenzhen Key Lab of Marine Genomics, State Key Laboratory of Agricultural Genomics, Shenzhen, 518083, China. .,China National Genebank, Shenzhen, 518083, China.
| | - Wansheng Jiang
- State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, 650223, China.
| | - Hui Yuan
- BGI-Shenzhen, Shenzhen, 518083, China.
| | - Chao Bian
- BGI-Shenzhen, Shenzhen, 518083, China. .,Shenzhen Key Lab of Marine Genomics, State Key Laboratory of Agricultural Genomics, Shenzhen, 518083, China.
| | - Jiang Lu
- BGI-Shenzhen, Shenzhen, 518083, China. .,College of Life Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China.
| | - Shiyang He
- BGI-Shenzhen, Shenzhen, 518083, China. .,College of Life Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China.
| | - Xiaofu Pan
- State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, 650223, China.
| | - Yaolei Zhang
- BGI-Shenzhen, Shenzhen, 518083, China. .,School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, 610054, China.
| | - Xiaoai Wang
- State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, 650223, China.
| | - Xinxin You
- BGI-Shenzhen, Shenzhen, 518083, China. .,Shenzhen Key Lab of Marine Genomics, State Key Laboratory of Agricultural Genomics, Shenzhen, 518083, China.
| | | | - Ying Sun
- BGI-Shenzhen, Shenzhen, 518083, China. .,China National Genebank, Shenzhen, 518083, China.
| | | | - Yong Liu
- BGI-Shenzhen, Shenzhen, 518083, China.
| | | | - He Zhang
- BGI-Shenzhen, Shenzhen, 518083, China.
| | - Xiaoyong Chen
- State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, 650223, China.
| | - Xinhui Zhang
- BGI-Shenzhen, Shenzhen, 518083, China. .,Shenzhen Key Lab of Marine Genomics, State Key Laboratory of Agricultural Genomics, Shenzhen, 518083, China.
| | - Lanping Zheng
- State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, 650223, China.
| | | | - Le Cheng
- China National Genebank, Shenzhen, 518083, China. .,BGI-Yunnan, Kunming, 650106, China.
| | - Jieming Chen
- BGI-Shenzhen, Shenzhen, 518083, China. .,Shenzhen Key Lab of Marine Genomics, State Key Laboratory of Agricultural Genomics, Shenzhen, 518083, China.
| | - Zhiqiang Ruan
- BGI-Shenzhen, Shenzhen, 518083, China. .,Shenzhen Key Lab of Marine Genomics, State Key Laboratory of Agricultural Genomics, Shenzhen, 518083, China.
| | - Jia Li
- BGI-Shenzhen, Shenzhen, 518083, China. .,Shenzhen Key Lab of Marine Genomics, State Key Laboratory of Agricultural Genomics, Shenzhen, 518083, China. .,College of Life Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China.
| | - Hui Yu
- BGI-Shenzhen, Shenzhen, 518083, China. .,Shenzhen Key Lab of Marine Genomics, State Key Laboratory of Agricultural Genomics, Shenzhen, 518083, China. .,College of Life Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China.
| | - Chao Peng
- BGI-Shenzhen, Shenzhen, 518083, China. .,Shenzhen Key Lab of Marine Genomics, State Key Laboratory of Agricultural Genomics, Shenzhen, 518083, China.
| | - Xingyu Ma
- Shenzhen BGI Fisheries Sci & Tech Co. Ltd., Shenzhen, 518083, China. .,Zhenjiang BGI Fisheries Science & Technology Industrial Co. Ltd., Zhenjiang, 212000, China.
| | - Junmin Xu
- Shenzhen BGI Fisheries Sci & Tech Co. Ltd., Shenzhen, 518083, China. .,Zhenjiang BGI Fisheries Science & Technology Industrial Co. Ltd., Zhenjiang, 212000, China.
| | - You He
- Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201204, China.
| | - Zhengfeng Xu
- State Key Laboratory of Reproductive Medicine, Department of Prenatal Diagnosis, Nanjing Maternity and Child Health Care Hospital, Nanjing Medical University, Nanjing, 210029, China.
| | - Pao Xu
- Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi, 214081, China.
| | - Jian Wang
- BGI-Shenzhen, Shenzhen, 518083, China. .,James D. Watson Institute of Genome Science, Hangzhou, 310008, China.
| | - Huanming Yang
- BGI-Shenzhen, Shenzhen, 518083, China. .,James D. Watson Institute of Genome Science, Hangzhou, 310008, China.
| | - Jun Wang
- BGI-Shenzhen, Shenzhen, 518083, China. .,Department of Biology, Ole Maaløes Vej 5, University of Copenhagen, DK-2200, Copenhagen, Denmark.
| | - Tony Whitten
- Fauna & Flora International, Cambridge, CB1 2JD, UK.
| | - Xun Xu
- BGI-Shenzhen, Shenzhen, 518083, China.
| | - Qiong Shi
- BGI-Shenzhen, Shenzhen, 518083, China. .,Shenzhen Key Lab of Marine Genomics, State Key Laboratory of Agricultural Genomics, Shenzhen, 518083, China. .,Shenzhen BGI Fisheries Sci & Tech Co. Ltd., Shenzhen, 518083, China. .,Zhenjiang BGI Fisheries Science & Technology Industrial Co. Ltd., Zhenjiang, 212000, China.
| |
Collapse
|
23
|
Dungan SZ, Kosyakov A, Chang BS. Spectral Tuning of Killer Whale (Orcinus orca) Rhodopsin: Evidence for Positive Selection and Functional Adaptation in a Cetacean Visual Pigment. Mol Biol Evol 2015; 33:323-36. [DOI: 10.1093/molbev/msv217] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
|
24
|
Wang Z, Chen Z, Xu S, Ren W, Zhou K, Yang G. 'Obesity' is healthy for cetaceans? Evidence from pervasive positive selection in genes related to triacylglycerol metabolism. Sci Rep 2015; 5:14187. [PMID: 26381091 PMCID: PMC4585638 DOI: 10.1038/srep14187] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2015] [Accepted: 08/18/2015] [Indexed: 11/25/2022] Open
Abstract
Cetaceans are a group of secondarily adapted marine mammals with an enigmatic history of transition from terrestrial to fully aquatic habitat and subsequent adaptive radiation in waters around the world. Numerous physiological and morphological cetacean characteristics have been acquired in response to this drastic habitat transition; for example, the thickened blubber is one of the most striking changes that increases their buoyancy, supports locomotion, and provides thermal insulation. However, the genetic basis underlying the blubber thickening in cetaceans remains poorly explored. Here, 88 candidate genes associated with triacylglycerol metabolism were investigated in representative cetaceans and other mammals to test whether the thickened blubber matched adaptive evolution of triacylglycerol metabolism-related genes. Positive selection was detected in 41 of the 88 candidate genes, and functional characterization of these genes indicated that these are involved mainly in triacylglycerol synthesis and lipolysis processes. In addition, some essential regulatory genes underwent significant positive selection in cetacean-specific lineages, whereas no selection signal was detected in the counterpart terrestrial mammals. The extensive occurrence of positive selection in triacylglycerol metabolism-related genes is suggestive of their essential role in secondary adaptation to an aquatic life, and further implying that 'obesity' might be an indicator of good health for cetaceans.
Collapse
Affiliation(s)
- Zhengfei Wang
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, College of Life Sciences, Nanjing Normal University, Nanjing 210023, China
| | - Zhuo Chen
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, College of Life Sciences, Nanjing Normal University, Nanjing 210023, China
| | - Shixia Xu
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, College of Life Sciences, Nanjing Normal University, Nanjing 210023, China
| | - Wenhua Ren
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, College of Life Sciences, Nanjing Normal University, Nanjing 210023, China
| | - Kaiya Zhou
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, College of Life Sciences, Nanjing Normal University, Nanjing 210023, China
| | - Guang Yang
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, College of Life Sciences, Nanjing Normal University, Nanjing 210023, China
| |
Collapse
|
25
|
Haasl RJ, Payseur BA. Fifteen years of genomewide scans for selection: trends, lessons and unaddressed genetic sources of complication. Mol Ecol 2015. [PMID: 26224644 DOI: 10.1111/mec.13339] [Citation(s) in RCA: 124] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Genomewide scans for natural selection (GWSS) have become increasingly common over the last 15 years due to increased availability of genome-scale genetic data. Here, we report a representative survey of GWSS from 1999 to present and find that (i) between 1999 and 2009, 35 of 49 (71%) GWSS focused on human, while from 2010 to present, only 38 of 83 (46%) of GWSS focused on human, indicating increased focus on nonmodel organisms; (ii) the large majority of GWSS incorporate interpopulation or interspecific comparisons using, for example F(ST), cross-population extended haplotype homozygosity or the ratio of nonsynonymous to synonymous substitutions; (iii) most GWSS focus on detection of directional selection rather than other modes such as balancing selection; and (iv) in human GWSS, there is a clear shift after 2004 from microsatellite markers to dense SNP data. A survey of GWSS meant to identify loci positively selected in response to severe hypoxic conditions support an approach to GWSS in which a list of a priori candidate genes based on potential selective pressures are used to filter the list of significant hits a posteriori. We also discuss four frequently ignored determinants of genomic heterogeneity that complicate GWSS: mutation, recombination, selection and the genetic architecture of adaptive traits. We recommend that GWSS methodology should better incorporate aspects of genomewide heterogeneity using empirical estimates of relevant parameters and/or realistic, whole-chromosome simulations to improve interpretation of GWSS results. Finally, we argue that knowledge of potential selective agents improves interpretation of GWSS results and that new methods focused on correlations between environmental variables and genetic variation can help automate this approach.
Collapse
Affiliation(s)
- Ryan J Haasl
- Department of Biology, University of Wisconsin-Platteville, 1 University Plaza, Platteville, WI, 53818, USA
| | - Bret A Payseur
- Laboratory of Genetics, University of Wisconsin-Madison, 425 Henry Mall, Madison, WI, 53706, USA
| |
Collapse
|
26
|
Tsagkogeorga G, McGowen MR, Davies KTJ, Jarman S, Polanowski A, Bertelsen MF, Rossiter SJ. A phylogenomic analysis of the role and timing of molecular adaptation in the aquatic transition of cetartiodactyl mammals. ROYAL SOCIETY OPEN SCIENCE 2015; 2:150156. [PMID: 26473040 PMCID: PMC4593674 DOI: 10.1098/rsos.150156] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2015] [Accepted: 09/02/2015] [Indexed: 05/30/2023]
Abstract
Recent studies have reported multiple cases of molecular adaptation in cetaceans related to their aquatic abilities. However, none of these has included the hippopotamus, precluding an understanding of whether molecular adaptations in cetaceans occurred before or after they split from their semi-aquatic sister taxa. Here, we obtained new transcriptomes from the hippopotamus and humpback whale, and analysed these together with available data from eight other cetaceans. We identified more than 11 000 orthologous genes and compiled a genome-wide dataset of 6845 coding DNA sequences among 23 mammals, to our knowledge the largest phylogenomic dataset to date for cetaceans. We found positive selection in nine genes on the branch leading to the common ancestor of hippopotamus and whales, and 461 genes in cetaceans compared to 64 in hippopotamus. Functional annotation revealed adaptations in diverse processes, including lipid metabolism, hypoxia, muscle and brain function. By combining these findings with data on protein-protein interactions, we found evidence suggesting clustering among gene products relating to nervous and muscular systems in cetaceans. We found little support for shared ancestral adaptations in the two taxa; most molecular adaptations in extant cetaceans occurred after their split with hippopotamids.
Collapse
Affiliation(s)
- Georgia Tsagkogeorga
- School of Biological and Chemical Sciences, Queen Mary University of London, Mile End Road, London E1 4NS, UK
| | - Michael R. McGowen
- School of Biological and Chemical Sciences, Queen Mary University of London, Mile End Road, London E1 4NS, UK
| | - Kalina T. J. Davies
- School of Biological and Chemical Sciences, Queen Mary University of London, Mile End Road, London E1 4NS, UK
| | - Simon Jarman
- Australian Antarctic Division, Channel Highway, Kingston, Tasmania 7050, Australia
| | - Andrea Polanowski
- Australian Antarctic Division, Channel Highway, Kingston, Tasmania 7050, Australia
| | - Mads F. Bertelsen
- Center for Zoo and Wild Animal Health, Copenhagen Zoo, Roskildevej 38, Frederiksberg 2000, Denmark
| | - Stephen J. Rossiter
- School of Biological and Chemical Sciences, Queen Mary University of London, Mile End Road, London E1 4NS, UK
| |
Collapse
|
27
|
Wang Y, Yang L, Wu B, Song Z, He S. Transcriptome analysis of the plateau fish (Triplophysa dalaica): Implications for adaptation to hypoxia in fishes. Gene 2015; 565:211-20. [DOI: 10.1016/j.gene.2015.04.023] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2014] [Revised: 04/02/2015] [Accepted: 04/07/2015] [Indexed: 12/28/2022]
|
28
|
Meng Y, Zhang W, Zhou J, Liu M, Chen J, Tian S, Zhuo M, Zhang Y, Zhong Y, Du H, Wang X. Genome-wide analysis of positively selected genes in seasonal and non-seasonal breeding species. PLoS One 2015; 10:e0126736. [PMID: 26000771 PMCID: PMC4441472 DOI: 10.1371/journal.pone.0126736] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2014] [Accepted: 04/07/2015] [Indexed: 01/04/2023] Open
Abstract
Some mammals breed throughout the year, while others breed only at certain times of year. These differences in reproductive behavior can be explained by evolution. We identified positively-selected genes in two sets of species with different degrees of relatedness including seasonal and non-seasonal breeding species, using branch-site models. After stringent filtering by sum of pairs scoring, we revealed that more genes underwent positive selection in seasonal compared with non-seasonal breeding species. Positively-selected genes were verified by cDNA mapping of the positive sites with the corresponding cDNA sequences. The design of the evolutionary analysis can effectively lower the false-positive rate and thus identify valid positive genes. Validated, positively-selected genes, including CGA, DNAH1, INVS, and CD151, were related to reproductive behaviors such as spermatogenesis and cell proliferation in non-seasonal breeding species. Genes in seasonal breeding species, including THRAP3, TH1L, and CMTM6, may be related to the evolution of sperm and the circadian rhythm system. Identification of these positively-selected genes might help to identify the molecular mechanisms underlying seasonal and non-seasonal reproductive behaviors.
Collapse
Affiliation(s)
- Yuhuan Meng
- School of Bioscience and Bioengineering, Guangdong Provincial Key Laboratory of Fermentation and Enzyme Engineering, South China University of Technology, Guangzhou, China
| | - Wenlu Zhang
- School of Bioscience and Bioengineering, Guangdong Provincial Key Laboratory of Fermentation and Enzyme Engineering, South China University of Technology, Guangzhou, China
| | - Jinghui Zhou
- School of Bioscience and Bioengineering, Guangdong Provincial Key Laboratory of Fermentation and Enzyme Engineering, South China University of Technology, Guangzhou, China
| | - Mingyu Liu
- School of Bioscience and Bioengineering, Guangdong Provincial Key Laboratory of Fermentation and Enzyme Engineering, South China University of Technology, Guangzhou, China
| | - Junhui Chen
- School of Bioscience and Bioengineering, Guangdong Provincial Key Laboratory of Fermentation and Enzyme Engineering, South China University of Technology, Guangzhou, China
| | - Shuai Tian
- School of Bioscience and Bioengineering, Guangdong Provincial Key Laboratory of Fermentation and Enzyme Engineering, South China University of Technology, Guangzhou, China
| | - Min Zhuo
- School of Bioscience and Bioengineering, Guangdong Provincial Key Laboratory of Fermentation and Enzyme Engineering, South China University of Technology, Guangzhou, China
| | - Yu Zhang
- Guangdong Key Laboratory of Laboratory Animals/Guangdong laboratory animals monitoring institution, Guangzhou, China
| | - Yang Zhong
- School of Life Sciences, Fudan University, Shanghai, China
- Institute of Biodiversity Science, Tibet University, Lhasa, China
| | - Hongli Du
- School of Bioscience and Bioengineering, Guangdong Provincial Key Laboratory of Fermentation and Enzyme Engineering, South China University of Technology, Guangzhou, China
| | - Xiaoning Wang
- School of Bioscience and Bioengineering, Guangdong Provincial Key Laboratory of Fermentation and Enzyme Engineering, South China University of Technology, Guangzhou, China
- Chinese PLA General Hospital, Beijing, China
| |
Collapse
|
29
|
Transcriptome sequencing of three Ranunculus species (Ranunculaceae) reveals candidate genes in adaptation from terrestrial to aquatic habitats. Sci Rep 2015; 5:10098. [PMID: 25993393 PMCID: PMC4438715 DOI: 10.1038/srep10098] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2014] [Accepted: 03/30/2015] [Indexed: 01/12/2023] Open
Abstract
Adaptation to aquatic habitats is a formidable challenge for terrestrial angiosperms that has long intrigued scientists. As part of a suite of work to explore the molecular mechanism of adaptation to aquatic habitats, we here sequenced the transcriptome of the submerged aquatic plant Ranunculus bungei, and two terrestrial relatives R. cantoniensis and R. brotherusii, followed by comparative evolutionary analyses to determine candidate genes for adaption to aquatic habitats. We obtained 126,037, 140,218 and 114,753 contigs for R. bungei, R. cantoniensis and R. brotherusii respectively. Bidirectional Best Hit method and OrthoMCL method identified 11,362 and 8,174 1:1:1 orthologous genes (one ortholog is represented in each of the three species) respectively. Non-synonymous/synonymous (dN/dS) analyses were performed with a maximum likelihood method and an approximate method for the three species-pairs. In total, 14 genes of R. bungei potentially involved in the adaptive transition from terrestrial to aquatic habitats were identified. Some of the homologs to these genes in model plants are involved in vacuole protein formation, regulating 'water transport process' and 'microtubule cytoskeleton organization'. Our study opens the door to understand the molecular mechanism of plant adaptation from terrestrial to aquatic habitats.
Collapse
|
30
|
Khudyakov JI, Preeyanon L, Champagne CD, Ortiz RM, Crocker DE. Transcriptome analysis of northern elephant seal (Mirounga angustirostris) muscle tissue provides a novel molecular resource and physiological insights. BMC Genomics 2015; 16:64. [PMID: 25758323 PMCID: PMC4328371 DOI: 10.1186/s12864-015-1253-6] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2014] [Accepted: 01/16/2015] [Indexed: 11/10/2022] Open
Abstract
Background The northern elephant seal, Mirounga angustirostris, is a valuable animal model of fasting adaptation and hypoxic stress tolerance. However, no reference sequence is currently available for this and many other marine mammal study systems, hindering molecular understanding of marine adaptations and unique physiology. Results We sequenced a transcriptome of M. angustirostris derived from muscle sampled during an acute stress challenge experiment to identify species-specific markers of stress axis activation and recovery. De novo assembly generated 164,966 contigs and a total of 522,699 transcripts, of which 68.70% were annotated using mouse, human, and domestic dog reference protein sequences. To reduce transcript redundancy, we removed highly similar isoforms in large gene families and produced a filtered assembly containing 336,657 transcripts. We found that a large number of annotated genes are associated with metabolic signaling, immune and stress responses, and muscle function. Preliminary differential expression analysis suggests a limited transcriptional response to acute stress involving alterations in metabolic and immune pathways and muscle tissue maintenance, potentially driven by early response transcription factors such as Cebpd. Conclusions We present the first reference sequence for Mirounga angustirostris produced by RNA sequencing of muscle tissue and cloud-based de novo transcriptome assembly. We annotated 395,102 transcripts, some of which may be novel isoforms, and have identified thousands of genes involved in key physiological processes. This resource provides elephant seal-specific gene sequences, complementing existing metabolite and protein expression studies and enabling future work on molecular pathways regulating adaptations such as fasting, hypoxia, and environmental stress responses in marine mammals. Electronic supplementary material The online version of this article (doi:10.1186/s12864-015-1253-6) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- Jane I Khudyakov
- Department of Biology, Sonoma State University, 1801 E Cotati Ave, Rohnert Park, CA, 94928, USA.
| | - Likit Preeyanon
- Michigan State University, Microbiology and Molecular Genetics, 567 Wilson Rd, East Lansing, MI, 48824, USA.
| | - Cory D Champagne
- National Marine Mammal Foundation, Conservation and Biological Research Program, 224 0Shelter Island Drive, San Diego, CA, 92106, USA.
| | - Rudy M Ortiz
- University of California, Merced, School of Natural Sciences, 5200 North Lake Rd, Merced, CA, 95343, USA.
| | - Daniel E Crocker
- Department of Biology, Sonoma State University, 1801 E Cotati Ave, Rohnert Park, CA, 94928, USA.
| |
Collapse
|
31
|
Villar D, Berthelot C, Aldridge S, Rayner TF, Lukk M, Pignatelli M, Park TJ, Deaville R, Erichsen JT, Jasinska AJ, Turner JMA, Bertelsen MF, Murchison EP, Flicek P, Odom DT. Enhancer evolution across 20 mammalian species. Cell 2015; 160:554-66. [PMID: 25635462 PMCID: PMC4313353 DOI: 10.1016/j.cell.2015.01.006] [Citation(s) in RCA: 467] [Impact Index Per Article: 51.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2014] [Revised: 10/31/2014] [Accepted: 12/15/2014] [Indexed: 12/21/2022]
Abstract
The mammalian radiation has corresponded with rapid changes in noncoding regions of the genome, but we lack a comprehensive understanding of regulatory evolution in mammals. Here, we track the evolution of promoters and enhancers active in liver across 20 mammalian species from six diverse orders by profiling genomic enrichment of H3K27 acetylation and H3K4 trimethylation. We report that rapid evolution of enhancers is a universal feature of mammalian genomes. Most of the recently evolved enhancers arise from ancestral DNA exaptation, rather than lineage-specific expansions of repeat elements. In contrast, almost all liver promoters are partially or fully conserved across these species. Our data further reveal that recently evolved enhancers can be associated with genes under positive selection, demonstrating the power of this approach for annotating regulatory adaptations in genomic sequences. These results provide important insight into the functional genetics underpinning mammalian regulatory evolution.
Collapse
Affiliation(s)
- Diego Villar
- University of Cambridge, Cancer Research UK Cambridge Institute, Robinson Way, Cambridge, CB2 0RE, UK
| | - Camille Berthelot
- European Molecular Biology Laboratory, European Bioinformatics Institute, Wellcome Trust Genome Campus, Hinxton, Cambridge, CB10 1SD, UK
| | - Sarah Aldridge
- University of Cambridge, Cancer Research UK Cambridge Institute, Robinson Way, Cambridge, CB2 0RE, UK
| | - Tim F Rayner
- University of Cambridge, Cancer Research UK Cambridge Institute, Robinson Way, Cambridge, CB2 0RE, UK
| | - Margus Lukk
- University of Cambridge, Cancer Research UK Cambridge Institute, Robinson Way, Cambridge, CB2 0RE, UK
| | - Miguel Pignatelli
- European Molecular Biology Laboratory, European Bioinformatics Institute, Wellcome Trust Genome Campus, Hinxton, Cambridge, CB10 1SD, UK
| | - Thomas J Park
- Department of Biological Sciences, University of Illinois at Chicago (UIC), 845 West Taylor Street, Chicago, IL 60607, USA
| | - Robert Deaville
- UK Cetacean Strandings Investigation Programme (CSIP) and Institute of Zoology, Zoological Society of London, Outer Circle, Regent's Park, London NW1 4RY, UK
| | - Jonathan T Erichsen
- School of Optometry and Vision Sciences, Cardiff University, Maindy Road, Cardiff CF24 4HQ, UK
| | - Anna J Jasinska
- UCLA Center for Neurobehavioral Genetics, 695 Charles E. Young Drive South, Los Angeles, CA 90095, USA
| | - James M A Turner
- Division of Stem Cell Biology and Developmental Genetics, MRC National Institute for Medical Research, Mill Hill, London NW7 1AA, UK
| | - Mads F Bertelsen
- Center for Zoo and Wild Animal Health, Copenhagen Zoo, Roskildevej 38, DK-2000 Frederiksberg, Denmark
| | - Elizabeth P Murchison
- Department of Veterinary Medicine, University of Cambridge, Madingley Road, Cambridge CB3 0ES, UK
| | - Paul Flicek
- European Molecular Biology Laboratory, European Bioinformatics Institute, Wellcome Trust Genome Campus, Hinxton, Cambridge, CB10 1SD, UK; Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton, Cambridge, CB10 1SD, UK.
| | - Duncan T Odom
- University of Cambridge, Cancer Research UK Cambridge Institute, Robinson Way, Cambridge, CB2 0RE, UK; Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton, Cambridge, CB10 1SD, UK.
| |
Collapse
|
32
|
Cao X, Sun YB, Irwin DM, Wang GD, Zhang YP. Nocturnal to Diurnal Transition in the Common Ancestor of Haplorrhines: Evidence from Genomic-Scan for Positively Selected Genes. J Genet Genomics 2015; 42:33-7. [DOI: 10.1016/j.jgg.2014.11.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2014] [Revised: 11/11/2014] [Accepted: 11/17/2014] [Indexed: 11/27/2022]
|
33
|
Yang W, Qi Y, Fu J. Exploring the genetic basis of adaptation to high elevations in reptiles: a comparative transcriptome analysis of two toad-headed agamas (genus Phrynocephalus). PLoS One 2014; 9:e112218. [PMID: 25386640 PMCID: PMC4227734 DOI: 10.1371/journal.pone.0112218] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2013] [Accepted: 10/10/2014] [Indexed: 12/05/2022] Open
Abstract
High elevation adaptation offers an excellent study system to understand the genetic basis of adaptive evolution. We acquired transcriptome sequences of two closely related lizards, Phrynocephalus przewalskii from low elevations and P. vlangalii from high elevations. Within a phylogenetic framework, we compared their genomic data along with green anole, chicken and Chinese softshell turtle, and identified candidate genes and functional categories that are potentially linked to adaptation to high elevation environments. More than 100 million sequence reads were generated for each species via Illumina sequencing. A de novo assembly produced 70,919 and 62,118 transcripts for P. przewalskii and P. vlangalii, respectively. Based on a well-established reptile phylogeny, we detected 143 positively selected genes (PSGs) along the P. vlangalii lineage from the 7,012 putative orthologs using a branch-site model. Furthermore, ten GO categories and one KEGG pathway that are over-represented by PSGs were recognized. In addition, 58 GO categories were revealed to have elevated evolutionary rates along the P. vlangalii lineage relative to P. przewalskii. These functional analyses further filter out PSGs that are most likely involved in the adaptation process to high elevations. Among them, ADAM17, MD, and HSP90B1 likely contributed to response to hypoxia, and POLK likely contributed to DNA repair. Many other candidate genes involved in gene expression and metabolism were also identified. Genome-wide scan for candidate genes may serve as the first step to explore the genetic basis of high elevation adaptation. Detailed comparative study and functional verification are needed to solidify any conclusions. High elevation adaptation requires coordinated changes in multiple genes that involve various physiological and biochemical pathways; we hope that our genetic studies will provide useful directions for future physiological or molecular studies in reptiles as well as other poikilothermic species.
Collapse
Affiliation(s)
- Weizhao Yang
- Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Yin Qi
- Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, China
| | - Jinzhong Fu
- Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, China
- Department of Integrative Biology, University of Guelph, Guelph, Ontario, Canada
- * E-mail:
| |
Collapse
|
34
|
Khan I, Maldonado E, Vasconcelos V, O'Brien SJ, Johnson WE, Antunes A. Mammalian keratin associated proteins (KRTAPs) subgenomes: disentangling hair diversity and adaptation to terrestrial and aquatic environments. BMC Genomics 2014; 15:779. [PMID: 25208914 PMCID: PMC4180150 DOI: 10.1186/1471-2164-15-779] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2014] [Accepted: 07/30/2014] [Indexed: 11/24/2022] Open
Abstract
Background Adaptation of mammals to terrestrial life was facilitated by the unique vertebrate trait of body hair, which occurs in a range of morphological patterns. Keratin associated proteins (KRTAPs), the major structural hair shaft proteins, are largely responsible for hair variation. Results We exhaustively characterized the KRTAP gene family in 22 mammalian genomes, confirming the existence of 30 KRTAP subfamilies evolving at different rates with varying degrees of diversification and homogenization. Within the two major classes of KRTAPs, the high cysteine (HS) subfamily experienced strong concerted evolution, high rates of gene conversion/recombination and high GC content. In contrast, high glycine-tyrosine (HGT) KRTAPs showed evidence of positive selection and low rates of gene conversion/recombination. Species with more hair and of higher complexity tended to have more KRATP genes (gene expansion). The sloth, with long and coarse hair, had the most KRTAP genes (175 with 141 being intact). By contrast, the “hairless” dolphin had 35 KRTAPs and the highest pseudogenization rate (74% relative to the 19% mammalian average). Unique hair-related phenotypes, such as scales (armadillo) and spines (hedgehog), were correlated with changes in KRTAPs. Gene expression variation probably also influences hair diversification patterns, for example human have an identical KRTAP repertoire as apes, but much less hair. Conclusions We hypothesize that differences in KRTAP gene repertoire and gene expression, together with distinct rates of gene conversion/recombination, pseudogenization and positive selection, are likely responsible for micro and macro-phenotypic hair diversification among mammals in response to adaptations to ecological pressures. Electronic supplementary material The online version of this article (doi:10.1186/1471-2164-15-779) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
| | | | | | | | | | - Agostinho Antunes
- CIMAR/CIIMAR, Centro Interdisciplinar de Investigação Marinha e Ambiental, Universidade do Porto, Rua dos Bragas 177, 4050-123 Porto, Portugal.
| |
Collapse
|
35
|
Baiji genomes reveal low genetic variability and new insights into secondary aquatic adaptations. Nat Commun 2014; 4:2708. [PMID: 24169659 PMCID: PMC3826649 DOI: 10.1038/ncomms3708] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2013] [Accepted: 10/03/2013] [Indexed: 01/07/2023] Open
Abstract
The baiji, or Yangtze River dolphin (Lipotes vexillifer), is a flagship species for the conservation of aquatic animals and ecosystems in the Yangtze River of China; however, this species has now been recognized as functionally extinct. Here we report a high-quality draft genome and three re-sequenced genomes of L. vexillifer using Illumina short-read sequencing technology. Comparative genomic analyses reveal that cetaceans have a slow molecular clock and molecular adaptations to their aquatic lifestyle. We also find a significantly lower number of heterozygous single nucleotide polymorphisms in the baiji compared to all other mammalian genomes reported thus far. A reconstruction of the demographic history of the baiji indicates that a bottleneck occurred near the end of the last deglaciation, a time coinciding with a rapid decrease in temperature and the rise of eustatic sea level.
Collapse
|
36
|
Zou M, Guo B, Ma X. Characterizing the transcriptome of yellow-cheek carp (Elopichthys bambusa) enables evolutionary analyses within endemic East Asian Cyprinidae. Gene 2014; 547:267-72. [PMID: 24973763 DOI: 10.1016/j.gene.2014.06.056] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2014] [Revised: 06/23/2014] [Accepted: 06/25/2014] [Indexed: 11/30/2022]
Abstract
The identification of genes that may be responsible for the divergence of closely related species is one of the central goals of evolutionary biology. The species of endemic East Asian Cyprinidae diverged less than 8millionyears ago, and the morphological differences among these species are great. However, the genetic basis of their divergence remains unknown. In this report, we investigated the transcriptome of one endemic East Asian cyprinid - the yellow-cheek carp Elopichthys bambusa. A comparison with the publicly available transcriptomes of other endemic East Asian cyprinids, including the silver carp (Hypophthalmichthys molitrix) and blunt-nose black bream (Megalobrama amblycephala), revealed a number of candidate adaptive genes in each species, such as zona pellucida glycoprotein 2 in E. bambusa and zebrafish vitelline envelope protein in M. amblycephala. An enrichment test showed the enrichment of some specific gene ontology (GO) terms for these putatively adaptive genes. Taken together, our work is the first step toward elucidating the genes that may be related to the divergence of endemic East Asian Cyprinidae, and these genes identified as being probably under positive selection should be good candidates for subsequent evolutionary and functional studies.
Collapse
Affiliation(s)
- Ming Zou
- College of Fisheries, Huazhong Agricultural University, Wuhan, People's Republic of China; Key Laboratory of Freshwater Animal Breeding, Ministry of Agriculture, People's Republic of China.
| | - Baocheng Guo
- Ecological Genetics Research Unit, Department of Biosciences, University of Helsinki, Helsinki 00014, Finland
| | - Xufa Ma
- College of Fisheries, Huazhong Agricultural University, Wuhan, People's Republic of China; Key Laboratory of Freshwater Animal Breeding, Ministry of Agriculture, People's Republic of China
| |
Collapse
|
37
|
McGowen MR, Gatesy J, Wildman DE. Molecular evolution tracks macroevolutionary transitions in Cetacea. Trends Ecol Evol 2014; 29:336-46. [DOI: 10.1016/j.tree.2014.04.001] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2013] [Revised: 04/02/2014] [Accepted: 04/03/2014] [Indexed: 10/25/2022]
|
38
|
Ai WM, Chen SB, Chen X, Shen XJ, Shen YY. Parallel evolution of IDH2 gene in cetaceans, primates and bats. FEBS Lett 2014; 588:450-4. [PMID: 24374336 DOI: 10.1016/j.febslet.2013.12.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2013] [Revised: 12/03/2013] [Accepted: 12/13/2013] [Indexed: 02/05/2023]
Abstract
Cetaceans and primates both have large brains that require large amounts of aerobic energy metabolism. In bats, the cost of flight makes locomotion energetically demanding. These mammalian groups may represent three independent evolutionary origins of an energy-demanding lifestyle in mammals. IDH2 encodes an enzyme in the tricarboxylic acid cycle in the mitochondrion, which plays a key role in aerobic energy metabolism. In this study, we cloned and sequenced this gene in two cetaceans, and 19 bat species, and compared the data with available primate sequences to test its evolution. We found significant signals of parallel evolution in this gene among these three groups. Parallel evolution of this gene may reflect their parallel evolution towards a higher demand for energy.
Collapse
Affiliation(s)
- Wei-Ming Ai
- Department of Marine Science, School of Life Science, Wenzhou Medical College, Wenzhou 325035, China
| | - Shao-Bo Chen
- Department of Marine Science, School of Life Science, Wenzhou Medical College, Wenzhou 325035, China
| | - Xiao Chen
- Department of Marine Science, School of Life Science, Wenzhou Medical College, Wenzhou 325035, China; Guangxi Key Lab for Mangrove Conservation and Utilization, Guangxi Mangrove Research Center, Beihai 536000, China
| | - Xue-Juan Shen
- Joint Influenza Research Centre (SUMC/HKU), Shantou University Medical College, Shantou 515041, China
| | - Yong-Yi Shen
- Joint Influenza Research Centre (SUMC/HKU), Shantou University Medical College, Shantou 515041, China; State Key Laboratory of Emerging Infectious Diseases, Li Ka Shing Faculty of Medicine, University of Hong Kong, Hong Kong; State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, the Chinese Academy of Sciences, Kunming 650223, China.
| |
Collapse
|
39
|
Yim HS, Cho YS, Guang X, Kang SG, Jeong JY, Cha SS, Oh HM, Lee JH, Yang EC, Kwon KK, Kim YJ, Kim TW, Kim W, Jeon JH, Kim SJ, Choi DH, Jho S, Kim HM, Ko J, Kim H, Shin YA, Jung HJ, Zheng Y, Wang Z, Chen Y, Chen M, Jiang A, Li E, Zhang S, Hou H, Kim TH, Yu L, Liu S, Ahn K, Cooper J, Park SG, Hong CP, Jin W, Kim HS, Park C, Lee K, Chun S, Morin PA, O'Brien SJ, Lee H, Kimura J, Moon DY, Manica A, Edwards J, Kim BC, Kim S, Wang J, Bhak J, Lee HS, Lee JH. Minke whale genome and aquatic adaptation in cetaceans. Nat Genet 2013; 46:88-92. [PMID: 24270359 DOI: 10.1038/ng.2835] [Citation(s) in RCA: 177] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2013] [Accepted: 11/01/2013] [Indexed: 01/14/2023]
Abstract
The shift from terrestrial to aquatic life by whales was a substantial evolutionary event. Here we report the whole-genome sequencing and de novo assembly of the minke whale genome, as well as the whole-genome sequences of three minke whales, a fin whale, a bottlenose dolphin and a finless porpoise. Our comparative genomic analysis identified an expansion in the whale lineage of gene families associated with stress-responsive proteins and anaerobic metabolism, whereas gene families related to body hair and sensory receptors were contracted. Our analysis also identified whale-specific mutations in genes encoding antioxidants and enzymes controlling blood pressure and salt concentration. Overall the whale-genome sequences exhibited distinct features that are associated with the physiological and morphological changes needed for life in an aquatic environment, marked by resistance to physiological stresses caused by a lack of oxygen, increased amounts of reactive oxygen species and high salt levels.
Collapse
Affiliation(s)
- Hyung-Soon Yim
- 1] Korea Institute of Ocean Science and Technology, Ansan, Republic of Korea. [2]
| | - Yun Sung Cho
- 1] Personal Genomics Institute, Genome Research Foundation, Suwon, Republic of Korea. [2]
| | - Xuanmin Guang
- 1] Beijing Genomics Institute (BGI)-Shenzhen, Shenzhen, China. [2]
| | - Sung Gyun Kang
- 1] Korea Institute of Ocean Science and Technology, Ansan, Republic of Korea. [2] Department of Marine Biotechnology, University of Science and Technology, Daejeon, Republic of Korea
| | - Jae-Yeon Jeong
- 1] Korea Institute of Ocean Science and Technology, Ansan, Republic of Korea. [2] Department of Marine Biotechnology, University of Science and Technology, Daejeon, Republic of Korea
| | - Sun-Shin Cha
- 1] Korea Institute of Ocean Science and Technology, Ansan, Republic of Korea. [2] Department of Marine Biotechnology, University of Science and Technology, Daejeon, Republic of Korea. [3] Ocean Science and Technology School, Korea Maritime University, Busan, Republic of Korea
| | - Hyun-Myung Oh
- Korea Institute of Ocean Science and Technology, Ansan, Republic of Korea
| | - Jae-Hak Lee
- Korea Institute of Ocean Science and Technology, Ansan, Republic of Korea
| | - Eun Chan Yang
- Korea Institute of Ocean Science and Technology, Ansan, Republic of Korea
| | - Kae Kyoung Kwon
- 1] Korea Institute of Ocean Science and Technology, Ansan, Republic of Korea. [2] Department of Marine Biotechnology, University of Science and Technology, Daejeon, Republic of Korea
| | - Yun Jae Kim
- Korea Institute of Ocean Science and Technology, Ansan, Republic of Korea
| | - Tae Wan Kim
- Korea Institute of Ocean Science and Technology, Ansan, Republic of Korea
| | - Wonduck Kim
- Korea Institute of Ocean Science and Technology, Ansan, Republic of Korea
| | - Jeong Ho Jeon
- Korea Institute of Ocean Science and Technology, Ansan, Republic of Korea
| | - Sang-Jin Kim
- 1] Korea Institute of Ocean Science and Technology, Ansan, Republic of Korea. [2] Department of Marine Biotechnology, University of Science and Technology, Daejeon, Republic of Korea
| | - Dong Han Choi
- Korea Institute of Ocean Science and Technology, Ansan, Republic of Korea
| | - Sungwoong Jho
- Personal Genomics Institute, Genome Research Foundation, Suwon, Republic of Korea
| | - Hak-Min Kim
- Personal Genomics Institute, Genome Research Foundation, Suwon, Republic of Korea
| | - Junsu Ko
- Theragen BiO Institute, TheragenEtex, Suwon, Republic of Korea
| | - Hyunmin Kim
- Theragen BiO Institute, TheragenEtex, Suwon, Republic of Korea
| | - Young-Ah Shin
- Personal Genomics Institute, Genome Research Foundation, Suwon, Republic of Korea
| | - Hyun-Ju Jung
- Theragen BiO Institute, TheragenEtex, Suwon, Republic of Korea
| | - Yuan Zheng
- Beijing Genomics Institute (BGI)-Shenzhen, Shenzhen, China
| | - Zhuo Wang
- Beijing Genomics Institute (BGI)-Shenzhen, Shenzhen, China
| | - Yan Chen
- Beijing Genomics Institute (BGI)-Shenzhen, Shenzhen, China
| | - Ming Chen
- Beijing Genomics Institute (BGI)-Shenzhen, Shenzhen, China
| | - Awei Jiang
- Beijing Genomics Institute (BGI)-Shenzhen, Shenzhen, China
| | - Erli Li
- Beijing Genomics Institute (BGI)-Shenzhen, Shenzhen, China
| | - Shu Zhang
- Beijing Genomics Institute (BGI)-Shenzhen, Shenzhen, China
| | - Haolong Hou
- Shaanxi Yulin Energy Group Co. Ltd., Yulin, Shaanxi, China
| | - Tae Hyung Kim
- Theragen BiO Institute, TheragenEtex, Suwon, Republic of Korea
| | - Lili Yu
- Beijing Genomics Institute (BGI)-Shenzhen, Shenzhen, China
| | - Sha Liu
- Beijing Genomics Institute (BGI)-Shenzhen, Shenzhen, China
| | - Kung Ahn
- Theragen BiO Institute, TheragenEtex, Suwon, Republic of Korea
| | - Jesse Cooper
- Theragen BiO Institute, TheragenEtex, Suwon, Republic of Korea
| | - Sin-Gi Park
- Theragen BiO Institute, TheragenEtex, Suwon, Republic of Korea
| | - Chang Pyo Hong
- Theragen BiO Institute, TheragenEtex, Suwon, Republic of Korea
| | - Wook Jin
- Department of Molecular Medicine, School of Medicine, Gachon University, Incheon, Republic of Korea
| | - Heui-Soo Kim
- Department of Biological Sciences, College of Natural Sciences, Pusan National University, Busan, Republic of Korea
| | - Chankyu Park
- Laboratory of Genome Biology, Department of Animal Biotechnology, Konkuk University, Seoul, Republic of Korea
| | - Kyooyeol Lee
- Laboratory of Genome Biology, Department of Animal Biotechnology, Konkuk University, Seoul, Republic of Korea
| | - Sung Chun
- Division of Genetics, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, USA
| | - Phillip A Morin
- Marine Mammal and Turtle Division, Southwest Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, La Jolla, California, USA
| | - Stephen J O'Brien
- Theodosius Dobzhansky Center for Genome Bioinformatics, St. Petersburg State University, St. Petersburg, Russia
| | - Hang Lee
- College of Veterinary Medicine, Seoul National University, Seoul, Republic of Korea
| | - Jumpei Kimura
- Department of Anatomy and Cell Biology, College of Veterinary Medicine, Seoul National University, Seoul, Republic of Korea
| | - Dae Yeon Moon
- Marine Biodiversity Institute of Korea (MABIK), Ministry of Ocean and Fisheries, Sejong, Republic of Korea
| | - Andrea Manica
- Evolutionary Ecology Group, Department of Zoology, University of Cambridge, Cambridge, UK
| | - Jeremy Edwards
- Department of Molecular Genetics and Microbiology, University of New Mexico Health Sciences Center, Albuquerque, New Mexico, USA
| | - Byung Chul Kim
- Personal Genomics Institute, Genome Research Foundation, Suwon, Republic of Korea
| | - Sangsoo Kim
- School of Systems Biomedical Science, Soongsil University, Seoul, Republic of Korea
| | - Jun Wang
- 1] Beijing Genomics Institute (BGI)-Shenzhen, Shenzhen, China. [2] Department of Biology, University of Copenhagen, Copenhagen, Denmark. [3] King Abdulaziz University, Jeddah, Saudi Arabia
| | - Jong Bhak
- 1] Personal Genomics Institute, Genome Research Foundation, Suwon, Republic of Korea. [2] Theragen BiO Institute, TheragenEtex, Suwon, Republic of Korea. [3] Program in Nano Science and Technology, Department of Transdisciplinary Studies, Seoul National University, Suwon, Republic of Korea. [4] Advanced Institutes of Convergence Technology Nano Science and Technology, Suwon, Republic of Korea
| | - Hyun Sook Lee
- 1] Korea Institute of Ocean Science and Technology, Ansan, Republic of Korea. [2] Department of Marine Biotechnology, University of Science and Technology, Daejeon, Republic of Korea
| | - Jung-Hyun Lee
- 1] Korea Institute of Ocean Science and Technology, Ansan, Republic of Korea. [2] Department of Marine Biotechnology, University of Science and Technology, Daejeon, Republic of Korea
| |
Collapse
|
40
|
Genome-wide signatures of convergent evolution in echolocating mammals. Nature 2013; 502:228-31. [PMID: 24005325 PMCID: PMC3836225 DOI: 10.1038/nature12511] [Citation(s) in RCA: 237] [Impact Index Per Article: 21.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2013] [Accepted: 07/30/2013] [Indexed: 11/09/2022]
Abstract
Evolution is typically thought to proceed through divergence of genes, proteins and ultimately phenotypes. However, similar traits might also evolve convergently in unrelated taxa owing to similar selection pressures. Adaptive phenotypic convergence is widespread in nature, and recent results from several genes have suggested that this phenomenon is powerful enough to also drive recurrent evolution at the sequence level. Where homoplasious substitutions do occur these have long been considered the result of neutral processes. However, recent studies have demonstrated that adaptive convergent sequence evolution can be detected in vertebrates using statistical methods that model parallel evolution, although the extent to which sequence convergence between genera occurs across genomes is unknown. Here we analyse genomic sequence data in mammals that have independently evolved echolocation and show that convergence is not a rare process restricted to several loci but is instead widespread, continuously distributed and commonly driven by natural selection acting on a small number of sites per locus. Systematic analyses of convergent sequence evolution in 805,053 amino acids within 2,326 orthologous coding gene sequences compared across 22 mammals (including four newly sequenced bat genomes) revealed signatures consistent with convergence in nearly 200 loci. Strong and significant support for convergence among bats and the bottlenose dolphin was seen in numerous genes linked to hearing or deafness, consistent with an involvement in echolocation. Unexpectedly, we also found convergence in many genes linked to vision: the convergent signal of many sensory genes was robustly correlated with the strength of natural selection. This first attempt to detect genome-wide convergent sequence evolution across divergent taxa reveals the phenomenon to be much more pervasive than previously recognized.
Collapse
|
41
|
Nery MF, González DJ, Opazo JC. How to Make a Dolphin: Molecular Signature of Positive Selection in Cetacean Genome. PLoS One 2013; 8:e65491. [PMID: 23840335 PMCID: PMC3686761 DOI: 10.1371/journal.pone.0065491] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2012] [Accepted: 04/25/2013] [Indexed: 01/30/2023] Open
Abstract
Cetaceans are unique in being the only mammals completely adapted to an aquatic environment. This adaptation has required complex changes and sometimes a complete restructuring of physiology, behavior and morphology. Identifying genes that have been subjected to selection pressure during cetacean evolution would greatly enhance our knowledge of the ways in which genetic variation in this mammalian order has been shaped by natural selection. Here, we performed a genome-wide scan for positive selection in the dolphin lineage. We employed models of codon substitution that account for variation of selective pressure over branches on the tree and across sites in a sequence. We analyzed 7,859 nuclear-coding ortholog genes and using a series of likelihood ratio tests (LRTs), we identified 376 genes (4.8%) with molecular signatures of positive selection in the dolphin lineage. We used the cow as the sister group and compared estimates of selection in the cetacean genome to this using the same methods. This allowed us to define which genes have been exclusively under positive selection in the dolphin lineage. The enrichment analysis found that the identified positively selected genes are significantly over-represented for three exclusive functional categories only in the dolphin lineage: segment specification, mesoderm development and system development. Of particular interest for cetacean adaptation to an aquatic life are the following GeneOntology targets under positive selection: genes related to kidney, heart, lung, eye, ear and nervous system development.
Collapse
Affiliation(s)
- Mariana F. Nery
- Instituto de Ciencias Ambientales y Evolutivas, Facultad de Ciencias, Universidad Austral de Chile, Valdivia, Chile
- Programa de Doctorado en Ciencias mención Ecología y Evolución, Facultad de Ciencias, Universidad Austral de Chile, Valdivia, Chile
| | - Dimar J. González
- Instituto de Ciencias Ambientales y Evolutivas, Facultad de Ciencias, Universidad Austral de Chile, Valdivia, Chile
| | - Juan C. Opazo
- Instituto de Ciencias Ambientales y Evolutivas, Facultad de Ciencias, Universidad Austral de Chile, Valdivia, Chile
| |
Collapse
|