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Dumont BL, Gatti DM, Ballinger MA, Lin D, Phifer-Rixey M, Sheehan MJ, Suzuki TA, Wooldridge LK, Frempong HO, Lawal RA, Churchill GA, Lutz C, Rosenthal N, White JK, Nachman MW. Into the Wild: A novel wild-derived inbred strain resource expands the genomic and phenotypic diversity of laboratory mouse models. PLoS Genet 2024; 20:e1011228. [PMID: 38598567 PMCID: PMC11034653 DOI: 10.1371/journal.pgen.1011228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Revised: 04/22/2024] [Accepted: 03/18/2024] [Indexed: 04/12/2024] Open
Abstract
The laboratory mouse has served as the premier animal model system for both basic and preclinical investigations for over a century. However, laboratory mice capture only a subset of the genetic variation found in wild mouse populations, ultimately limiting the potential of classical inbred strains to uncover phenotype-associated variants and pathways. Wild mouse populations are reservoirs of genetic diversity that could facilitate the discovery of new functional and disease-associated alleles, but the scarcity of commercially available, well-characterized wild mouse strains limits their broader adoption in biomedical research. To overcome this barrier, we have recently developed, sequenced, and phenotyped a set of 11 inbred strains derived from wild-caught Mus musculus domesticus. Each of these "Nachman strains" immortalizes a unique wild haplotype sampled from one of five environmentally distinct locations across North and South America. Whole genome sequence analysis reveals that each strain carries between 4.73-6.54 million single nucleotide differences relative to the GRCm39 mouse reference, with 42.5% of variants in the Nachman strain genomes absent from current classical inbred mouse strain panels. We phenotyped the Nachman strains on a customized pipeline to assess the scope of disease-relevant neurobehavioral, biochemical, physiological, metabolic, and morphological trait variation. The Nachman strains exhibit significant inter-strain variation in >90% of 1119 surveyed traits and expand the range of phenotypic diversity captured in classical inbred strain panels. These novel wild-derived inbred mouse strain resources are set to empower new discoveries in both basic and preclinical research.
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Affiliation(s)
- Beth L. Dumont
- The Jackson Laboratory, 600 Main Street, Bar Harbor, Maine, United States of America
- Graduate School of Biomedical Sciences, Tufts University, Boston, Massachusetts, United States of America
- Graduate School of Biomedical Science and Engineering, The University of Maine, Orono, Maine, United States of America
| | - Daniel M. Gatti
- The Jackson Laboratory, 600 Main Street, Bar Harbor, Maine, United States of America
| | - Mallory A. Ballinger
- Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, New York, United States of America
| | - Dana Lin
- Department of Biological Sciences, Vanderbilt University, Nashville, Tennessee, United States of America
| | - Megan Phifer-Rixey
- Department of Biology, Drexel University, Philadelphia, Pennsylvania, United States of America
| | - Michael J. Sheehan
- Department of Neurobiology and Behavior, Cornell University, Ithaca, New York, United States of America
| | - Taichi A. Suzuki
- College of Health Solutions and Biodesign Center for Health Through Microbiomes, Arizona State University, Tempe, Arizona, United States of America
| | - Lydia K. Wooldridge
- The Jackson Laboratory, 600 Main Street, Bar Harbor, Maine, United States of America
| | - Hilda Opoku Frempong
- The Jackson Laboratory, 600 Main Street, Bar Harbor, Maine, United States of America
- Graduate School of Biomedical Science and Engineering, The University of Maine, Orono, Maine, United States of America
| | - Raman Akinyanju Lawal
- The Jackson Laboratory, 600 Main Street, Bar Harbor, Maine, United States of America
| | - Gary A. Churchill
- The Jackson Laboratory, 600 Main Street, Bar Harbor, Maine, United States of America
- Graduate School of Biomedical Sciences, Tufts University, Boston, Massachusetts, United States of America
- Graduate School of Biomedical Science and Engineering, The University of Maine, Orono, Maine, United States of America
| | - Cathleen Lutz
- The Jackson Laboratory, 600 Main Street, Bar Harbor, Maine, United States of America
| | - Nadia Rosenthal
- The Jackson Laboratory, 600 Main Street, Bar Harbor, Maine, United States of America
- Graduate School of Biomedical Sciences, Tufts University, Boston, Massachusetts, United States of America
- Graduate School of Biomedical Science and Engineering, The University of Maine, Orono, Maine, United States of America
- National Heart and Lung Institute, Imperial College London, London, United Kingdom
| | - Jacqueline K. White
- The Jackson Laboratory, 600 Main Street, Bar Harbor, Maine, United States of America
| | - Michael W. Nachman
- Department of Integrative Biology, Museum of Vertebrate Zoology, and Center for Computational Biology, University of California, Berkeley, Berkeley, California, United States of America
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AbuAlia KFN, Damm E, Ullrich KK, Mukaj A, Parvanov E, Forejt J, Odenthal-Hesse L. Natural variation in the zinc-finger-encoding exon of Prdm9 affects hybrid sterility phenotypes in mice. Genetics 2024; 226:iyae004. [PMID: 38217871 PMCID: PMC10917509 DOI: 10.1093/genetics/iyae004] [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: 11/20/2023] [Revised: 01/04/2024] [Accepted: 01/05/2024] [Indexed: 01/15/2024] Open
Abstract
PRDM9-mediated reproductive isolation was first described in the progeny of Mus musculus musculus (MUS) PWD/Ph and Mus musculus domesticus (DOM) C57BL/6J inbred strains. These male F1 hybrids fail to complete chromosome synapsis and arrest meiosis at prophase I, due to incompatibilities between the Prdm9 gene and hybrid sterility locus Hstx2. We identified 14 alleles of Prdm9 in exon 12, encoding the DNA-binding domain of the PRDM9 protein in outcrossed wild mouse populations from Europe, Asia, and the Middle East, 8 of which are novel. The same allele was found in all mice bearing introgressed t-haplotypes encompassing Prdm9. We asked whether 7 novel Prdm9 alleles in MUS populations and the t-haplotype allele in 1 MUS and 3 DOM populations induce Prdm9-mediated reproductive isolation. The results show that only combinations of the dom2 allele of DOM origin and the MUS msc1 allele ensure complete infertility of intersubspecific hybrids in outcrossed wild populations and inbred mouse strains examined so far. The results further indicate that MUS mice may share the erasure of PRDM9msc1 binding motifs in populations with different Prdm9 alleles, which implies that erased PRDM9 binding motifs may be uncoupled from their corresponding Prdm9 alleles at the population level. Our data corroborate the model of Prdm9-mediated hybrid sterility beyond inbred strains of mice and suggest that sterility alleles of Prdm9 may be rare.
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Affiliation(s)
- Khawla F N AbuAlia
- Research Group Meiotic Recombination and Genome Instability, Max Planck Institute for Evolutionary Biology, Plön D-24306, Germany
| | - Elena Damm
- Research Group Meiotic Recombination and Genome Instability, Max Planck Institute for Evolutionary Biology, Plön D-24306, Germany
| | - Kristian K Ullrich
- Research Group Meiotic Recombination and Genome Instability, Max Planck Institute for Evolutionary Biology, Plön D-24306, Germany
| | - Amisa Mukaj
- Laboratory of Mouse Molecular Genetics, Institute of Molecular Genetics, Czech Academy of Sciences, Vestec CZ-25250, Czech Republic
| | - Emil Parvanov
- Laboratory of Mouse Molecular Genetics, Institute of Molecular Genetics, Czech Academy of Sciences, Vestec CZ-25250, Czech Republic
- Department of Translational Stem Cell Biology, Research Institute of the Medical University of Varna, 9002 Varna, Bulgaria
- Ludwig Boltzmann Institute for Digital Health and Patient Safety, Medical University of Vienna, 1090 Vienna, Austria
| | - Jiri Forejt
- Laboratory of Mouse Molecular Genetics, Institute of Molecular Genetics, Czech Academy of Sciences, Vestec CZ-25250, Czech Republic
| | - Linda Odenthal-Hesse
- Research Group Meiotic Recombination and Genome Instability, Max Planck Institute for Evolutionary Biology, Plön D-24306, Germany
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3
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Dumont BL, Gatti D, Ballinger MA, Lin D, Phifer-Rixey M, Sheehan MJ, Suzuki TA, Wooldridge LK, Frempong HO, Churchill G, Lutz C, Rosenthal N, White JK, Nachman MW. Into the Wild: A novel wild-derived inbred strain resource expands the genomic and phenotypic diversity of laboratory mouse models. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.09.21.558738. [PMID: 37790321 PMCID: PMC10542534 DOI: 10.1101/2023.09.21.558738] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/05/2023]
Abstract
The laboratory mouse has served as the premier animal model system for both basic and preclinical investigations for a century. However, laboratory mice capture a narrow subset of the genetic variation found in wild mouse populations. This consideration inherently restricts the scope of potential discovery in laboratory models and narrows the pool of potentially identified phenotype-associated variants and pathways. Wild mouse populations are reservoirs of predicted functional and disease-associated alleles, but the sparsity of commercially available, well-characterized wild mouse strains limits their broader adoption in biomedical research. To overcome this barrier, we have recently imported, sequenced, and phenotyped a set of 11 wild-derived inbred strains developed from wild-caught Mus musculus domesticus. Each of these "Nachman strains" immortalizes a unique wild haplotype sampled from five environmentally diverse locations across North and South America: Saratoga Springs, New York, USA; Gainesville, Florida, USA; Manaus, Brazil; Tucson, Arizona, USA; and Edmonton, Alberta, Canada. Whole genome sequence analysis reveals that each strain carries between 4.73-6.54 million single nucleotide differences relative to the mouse reference assembly, with 42.5% of variants in the Nachman strain genomes absent from classical inbred mouse strains. We phenotyped the Nachman strains on a customized pipeline to assess the scope of disease-relevant neurobehavioral, biochemical, physiological, metabolic, and morphological trait variation. The Nachman strains exhibit significant inter-strain variation in >90% of 1119 surveyed traits and expand the range of phenotypic diversity captured in classical inbred strain panels alone. Taken together, our work introduces a novel wild-derived inbred mouse strain resource that will enable new discoveries in basic and preclinical research. These strains are currently available through The Jackson Laboratory Repository under laboratory code NachJ.
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Affiliation(s)
- Beth L Dumont
- The Jackson Laboratory, 600 Main Street, Bar Harbor, ME, 04609, USA
- Tufts University, Graduate School of Biomedical Sciences, 136 Harrison Ave, Boston, MA, 02111, USA
- The University of Maine, Graduate School of Biomedical Science and Engineering, 5775 Stodder Hall, Room 46, Orono, ME, 04469, USA
| | - Daniel Gatti
- The Jackson Laboratory, 600 Main Street, Bar Harbor, ME, 04609, USA
| | - Mallory A Ballinger
- Department of Integrative Biology, Center for Computational Biology, and Museum of Vertebrate Zoology, University of California, Berkeley, Berkeley, CA 94720, USA
| | - Dana Lin
- Department of Integrative Biology, Center for Computational Biology, and Museum of Vertebrate Zoology, University of California, Berkeley, Berkeley, CA 94720, USA
| | | | - Michael J Sheehan
- Department of Neurobiology and Behavior, Cornell University, Ithaca, NY 14853, USA
| | - Taichi A Suzuki
- College of Health Solutions and Biodesign Center for Health Through Microbiomes, Arizona State University, Tempe, AZ, USA 85281
| | | | - Hilda Opoku Frempong
- The Jackson Laboratory, 600 Main Street, Bar Harbor, ME, 04609, USA
- The University of Maine, Graduate School of Biomedical Science and Engineering, 5775 Stodder Hall, Room 46, Orono, ME, 04469, USA
| | - Gary Churchill
- The Jackson Laboratory, 600 Main Street, Bar Harbor, ME, 04609, USA
- Tufts University, Graduate School of Biomedical Sciences, 136 Harrison Ave, Boston, MA, 02111, USA
- The University of Maine, Graduate School of Biomedical Science and Engineering, 5775 Stodder Hall, Room 46, Orono, ME, 04469, USA
| | - Cathleen Lutz
- The Jackson Laboratory, 600 Main Street, Bar Harbor, ME, 04609, USA
| | - Nadia Rosenthal
- The Jackson Laboratory, 600 Main Street, Bar Harbor, ME, 04609, USA
- Tufts University, Graduate School of Biomedical Sciences, 136 Harrison Ave, Boston, MA, 02111, USA
- The University of Maine, Graduate School of Biomedical Science and Engineering, 5775 Stodder Hall, Room 46, Orono, ME, 04469, USA
| | | | - Michael W Nachman
- Department of Integrative Biology, Center for Computational Biology, and Museum of Vertebrate Zoology, University of California, Berkeley, Berkeley, CA 94720, USA
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Jourdan J, Bundschuh M, Copilaș-Ciocianu D, Fišer C, Grabowski M, Hupało K, Jemec Kokalj A, Kabus J, Römbke J, Soose LJ, Oehlmann J. Cryptic Species in Ecotoxicology. ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2023; 42:1889-1914. [PMID: 37314101 DOI: 10.1002/etc.5696] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2023] [Revised: 03/20/2023] [Accepted: 06/12/2023] [Indexed: 06/15/2023]
Abstract
The advent of genetic methods has led to the discovery of an increasing number of species that previously could not be distinguished from each other on the basis of morphological characteristics. Even though there has been an exponential growth of publications on cryptic species, such species are rarely considered in ecotoxicology. Thus, the particular question of ecological differentiation and the sensitivity of closely related cryptic species is rarely addressed. Tackling this question, however, is of key importance for evolutionary ecology, conservation biology, and, in particular, regulatory ecotoxicology. At the same time, the use of species with (known or unknown) cryptic diversity might be a reason for the lack of reproducibility of ecotoxicological experiments and implies a false extrapolation of the findings. Our critical review includes a database and literature search through which we investigated how many of the species most frequently used in ecotoxicological assessments show evidence of cryptic diversity. We found a high proportion of reports indicating overlooked species diversity, especially in invertebrates. In terrestrial and aquatic realms, at least 67% and 54% of commonly used species, respectively, were identified as cryptic species complexes. The issue is less prominent in vertebrates, in which we found evidence for cryptic species complexes in 27% of aquatic and 6.7% of terrestrial vertebrates. We further exemplified why different evolutionary histories may significantly determine cryptic species' ecology and sensitivity to pollutants. This in turn may have a major impact on the results of ecotoxicological tests and, consequently, the outcome of environmental risk assessments. Finally, we provide a brief guideline on how to deal practically with cryptic diversity in ecotoxicological studies in general and its implementation in risk assessment procedures in particular. Environ Toxicol Chem 2023;42:1889-1914. © 2023 The Authors. Environmental Toxicology and Chemistry published by Wiley Periodicals LLC on behalf of SETAC.
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Affiliation(s)
- Jonas Jourdan
- Department of Aquatic Ecotoxicology, Goethe University, Frankfurt am Main, Germany
| | - Mirco Bundschuh
- iES Landau, Institute for Environmental Sciences, University of Kaiserslautern-Landau, Landau, Germany
- Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Uppsala, Sweden
| | - Denis Copilaș-Ciocianu
- Laboratory of Evolutionary Ecology of Hydrobionts, Nature Research Centre, Vilnius, Lithuania
| | - Cene Fišer
- Department of Biology, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Michał Grabowski
- Invertebrate Zoology and Hydrobiology, University of Lodz, Łódź, Poland
| | - Kamil Hupało
- Department of Aquatic Ecosystem Research, Faculty of Biology, University of Duisburg-Essen, Essen, Germany
| | - Anita Jemec Kokalj
- Department of Biology, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Jana Kabus
- Department of Aquatic Ecotoxicology, Goethe University, Frankfurt am Main, Germany
| | - Jörg Römbke
- ECT Oekotoxikologie, Flörsheim am Main, Germany
| | - Laura J Soose
- Department of Aquatic Ecotoxicology, Goethe University, Frankfurt am Main, Germany
| | - Jörg Oehlmann
- Department of Aquatic Ecotoxicology, Goethe University, Frankfurt am Main, Germany
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5
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Woodman N, Ikram S, Rowland J. Environmental implications of Ptolemaic Period rodents and shrews from the Sacred Falcon Necropolis at Quesna, Egypt (Mammalia: Muridae and Soricidae). BMC Ecol Evol 2022; 22:148. [PMID: 36564717 PMCID: PMC9789621 DOI: 10.1186/s12862-022-02101-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Accepted: 12/12/2022] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND Assemblages of mummified and preserved animals in necropoleis of Ptolemaic Period Egypt (ca. 332-30 BC) document some aspects of the ceremonial and religious practices of the ancient Egyptians, but study of these animal remains can also provide insight into the local environments in which the animals and humans lived. RESULTS Excavations of the Sacred Falcon Necropolis at Quesna in the Nile Delta have yielded many thousands of animal remains, mostly of raptors, but also of a lesser number of small, wild mammals. Among the latter, we identified four species of murid rodents (Rodentia: Muridae) and five species of shrews (Eulipotyphla: Soricidae). The soricids are of particular interest because they represent a more diverse assemblage of species than occurs in the delta today. They include one species, Crocidura gueldenstaedtii (Pallas, 1811), that no longer occurs in the delta and another, C. fulvastra (Sundevall, 1843), that is now extirpated from Egypt. CONCLUSIONS The coexistence of this diverse small mammal community suggests that a greater availability and variety of mesic habitats were present during the Ptolemaic Period than occur there now. The local mammal faunas recovered at Quesna and other well-studied ancient Egyptian sites together provide evidence of a richer, more complex regional environment along the Nile Valley. They also provide important insight regarding the biogeography of the individual species comprising the faunas and about the extent of faunal turnover since the Ptolemaic Period.
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Affiliation(s)
- Neal Woodman
- grid.2865.90000000121546924U.S. Geological Survey, Eastern Ecological Science Center at Patuxent Research Refuge, Laurel, MD USA ,grid.453560.10000 0001 2192 7591Department of Vertebrate Zoology, National Museum of Natural History, Smithsonian Institution, Washington, DC USA
| | - Salima Ikram
- grid.252119.c0000 0004 0513 1456Department of Sociology, Egyptology, and Anthropology, American University in Cairo, New Cairo, Egypt ,grid.11956.3a0000 0001 2214 904XDepartment of Ancient Studies, Stellenbosch University, Stellenbosch, South Africa
| | - Joanne Rowland
- grid.4305.20000 0004 1936 7988Department of Archaeology, School of History, Classics, and Archaeology, The University of Edinburgh, Edinburgh, Scotland
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Lawal RA, Mathis VL, Barter ME, Charette JR, Garretson A, Dumont BL. Taxonomic assessment of two wild house mouse subspecies using whole-genome sequencing. Sci Rep 2022; 12:20866. [PMID: 36460842 PMCID: PMC9718808 DOI: 10.1038/s41598-022-25420-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Accepted: 11/29/2022] [Indexed: 12/04/2022] Open
Abstract
The house mouse species complex (Mus musculus) is comprised of three primary subspecies. A large number of secondary subspecies have also been suggested on the basis of divergent morphology and molecular variation at limited numbers of markers. While the phylogenetic relationships among the primary M. musculus subspecies are well-defined, relationships among secondary subspecies and between secondary and primary subspecies remain less clear. Here, we integrate de novo genome sequencing of museum-stored specimens of house mice from one secondary subspecies (M. m. bactrianus) and publicly available genome sequences of house mice previously characterized as M. m. helgolandicus, with whole genome sequences from diverse representatives of the three primary house mouse subspecies. We show that mice assigned to the secondary M. m. bactrianus and M. m. helgolandicus subspecies are not genetically differentiated from M. m. castaneus and M. m. domesticus, respectively. Overall, our work suggests that the M. m. bactrianus and M. m. helgolandicus subspecies are not well-justified taxonomic entities, emphasizing the importance of leveraging whole-genome sequence data to inform subspecies designations. Additionally, our investigation provides tailored experimental procedures for generating whole genome sequences from air-dried mouse skins, along with key genomic resources to inform future genomic studies of wild mouse diversity.
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Affiliation(s)
| | - Verity L Mathis
- Florida Museum of Natural History, University of Florida, 1659 Museum Road, Gainesville, FL, 32611, USA
| | - Mary E Barter
- The Jackson Laboratory, 600 Main Street, Bar Harbor, 04609, USA
| | | | - Alexis Garretson
- The Jackson Laboratory, 600 Main Street, Bar Harbor, 04609, USA
- Graduate School of Biomedical Sciences, Tufts University, 136 Harrison Ave, Boston, MA, 02111, USA
| | - Beth L Dumont
- The Jackson Laboratory, 600 Main Street, Bar Harbor, 04609, USA.
- Graduate School of Biomedical Sciences, Tufts University, 136 Harrison Ave, Boston, MA, 02111, USA.
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7
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Morgan AP, Hughes JJ, Didion JP, Jolley WJ, Campbell KJ, Threadgill DW, Bonhomme F, Searle JB, de Villena FPM. Population structure and inbreeding in wild house mice (Mus musculus) at different geographic scales. Heredity (Edinb) 2022; 129:183-194. [PMID: 35764696 PMCID: PMC9411160 DOI: 10.1038/s41437-022-00551-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Revised: 06/09/2022] [Accepted: 06/10/2022] [Indexed: 11/08/2022] Open
Abstract
House mice (Mus musculus) have spread globally as a result of their commensal relationship with humans. In the form of laboratory strains, both inbred and outbred, they are also among the most widely used model organisms in biomedical research. Although the general outlines of house mouse dispersal and population structure are well known, details have been obscured by either limited sample size or small numbers of markers. Here we examine ancestry, population structure, and inbreeding using SNP microarray genotypes in a cohort of 814 wild mice spanning five continents and all major subspecies of Mus, with a focus on M. m. domesticus. We find that the major axis of genetic variation in M. m. domesticus is a south-to-north gradient within Europe and the Mediterranean. The dominant ancestry component in North America, Australia, New Zealand, and various small offshore islands are of northern European origin. Next we show that inbreeding is surprisingly pervasive and highly variable, even between nearby populations. By inspecting the length distribution of homozygous segments in individual genomes, we find that inbreeding in commensal populations is mostly due to consanguinity. Our results offer new insight into the natural history of an important model organism for medicine and evolutionary biology.
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Affiliation(s)
- Andrew P Morgan
- Department of Genetics and Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, NC, USA.
- Department of Medicine, Duke University Hospital, Durham, NC, USA.
| | - Jonathan J Hughes
- Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, NY, USA
| | - John P Didion
- Department of Genetics and Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, NC, USA
- Independent Scientist, San Diego, CA, USA
| | | | | | - David W Threadgill
- Institute for Genome Sciences and Society, Texas A&M University, College Station, TX, USA
| | - Francois Bonhomme
- Institut des Sciences de l'Évolution Montpellier, Université de Montpellier, Montpellier, France
| | - Jeremy B Searle
- Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, NY, USA
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8
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Gritsyshin VA, Artyushin IV, Burskaya VO, Sheftel BI, Lebedev VS, Bannikova AA. Phylogeography of the White-Toothed Shrews Crocidura suaveolens and Crocidura sibirica: Searching for the Geographical Homeland. BIOL BULL+ 2022. [DOI: 10.1134/s1062359022020091] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Abstract
We studied the polymorphism of the cytb gene in two forms of the Lesser White-toothed Shrew species complex: Crocidura suaveolens s. stricto and C. sibirica. The haplotypes of C. sibirica are found to be very similar to those of Crocidura suaveolens. They do not belong to a distinct haplogroup. The molecular diversity of the populations in the Asian part of the range is higher than in Eastern Europe. For the combined sample from Asia and Europe together, we revealed a significant signal of population expansion. Analysis of the expansion time showed that the Asian territory was colonized earlier (before the last glacial maximum) than the Eastern Europe (at the very end of the Late Pleistocene and in the early Holocene). The results of the ancestral area reconstruction are consistent with the hypothesis of a Middle Asian origin of the C. suaveolens/C. sibirica group, recent colonization of Inner Asia and later penetration into Eastern Europe.
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9
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Fujiwara K, Kawai Y, Takada T, Shiroishi T, Saitou N, Suzuki H, Osada N. Insights into Mus musculus population structure across Eurasia revealed by whole-genome analysis. Genome Biol Evol 2022; 14:6582302. [PMID: 35524942 PMCID: PMC9122283 DOI: 10.1093/gbe/evac068] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/03/2022] [Indexed: 11/13/2022] Open
Abstract
For more than 100 years, house mice (Mus musculus) have been used as a key animal model in biomedical research. House mice are genetically diverse, yet their genetic background at the global level has not been fully understood. Previous studies have suggested that they originated in South Asia and diverged into three major subspecies, almost simultaneously, approximately 110,000–500,000 years ago; however, they have spread across the world with the migration of modern humans in prehistoric and historic times (∼10,000 years ago to the present day) and have undergone secondary contact, which has complicated the genetic landscape of wild house mice. In this study, we sequenced the whole-genome sequences of 98 wild house mice collected from Eurasia, particularly East Asia, Southeast Asia, and South Asia. Although wild house mice were found to consist of three major genetic groups corresponding to the three major subspecies, individuals representing admixtures between subspecies were more prevalent in East Asia than has been previously recognized. Furthermore, several samples exhibited an incongruent pattern of genealogies between mitochondrial and autosomal genomes. Using samples that likely retained the original genetic components of subspecies with the least admixture, we estimated the pattern and timing of divergence among the subspecies. The estimated divergence time of the three subspecies was 187,000–226,000 years ago. These results will help us to understand the genetic diversity of wild mice on a global scale, and the findings will be particularly useful in future biomedical and evolutionary studies involving laboratory mice established from such wild mice.
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Affiliation(s)
- Kazumichi Fujiwara
- Graduate School of Information Science and Technology, Hokkaido University, Sapporo, Japan.,Global Station for Big Data and Cybersecurity, GI-CoRE, Hokkaido University, Sapporo, Japan
| | - Yosuke Kawai
- Genome Medical Science Project (Toyama), National Center for Global Health and Medicine (NCGM), Tokyo, Japan
| | - Toyoyuki Takada
- Integrated BioResource Information Division, RIKEN BioResource Research Center, Tsukuba, Japan
| | | | - Naruya Saitou
- Population Genetics Laboratory, National Institute of Genetics, Mishima, Japan.,Faculty of Medicine, University of the Ryukyus, Okinawa, Japan
| | - Hitoshi Suzuki
- Graduate School of Environmental Science, Hokkaido University, Sapporo, Japan
| | - Naoki Osada
- Graduate School of Information Science and Technology, Hokkaido University, Sapporo, Japan.,Global Station for Big Data and Cybersecurity, GI-CoRE, Hokkaido University, Sapporo, Japan
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10
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Banker SE, Bonhomme F, Nachman MW. Bidirectional introgression between Mus musculus domesticus and Mus spretus. Genome Biol Evol 2022; 14:6509516. [PMID: 35038727 PMCID: PMC8784167 DOI: 10.1093/gbe/evab288] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/22/2021] [Indexed: 11/24/2022] Open
Abstract
Introgressed variants from other species can be an important source of genetic variation because they may arise rapidly, can include multiple mutations on a single haplotype, and have often been pretested by selection in the species of origin. Although introgressed alleles are generally deleterious, several studies have reported introgression as the source of adaptive alleles—including the rodenticide-resistant variant of Vkorc1 that introgressed from Mus spretus into European populations of Mus musculus domesticus. Here, we conducted bidirectional genome scans to characterize introgressed regions into one wild population of M. spretus from Spain and three wild populations of M. m. domesticus from France, Germany, and Iran. Despite the fact that these species show considerable intrinsic postzygotic reproductive isolation, introgression was observed in all individuals, including in the M. musculus reference genome (GRCm38). Mus spretus individuals had a greater proportion of introgression compared with M. m. domesticus, and within M. m. domesticus, the proportion of introgression decreased with geographic distance from the area of sympatry. Introgression was observed on all autosomes for both species, but not on the X-chromosome in M. m. domesticus, consistent with known X-linked hybrid sterility and inviability genes that have been mapped to the M. spretus X-chromosome. Tract lengths were generally short with a few outliers of up to 2.7 Mb. Interestingly, the longest introgressed tracts were in olfactory receptor regions, and introgressed tracts were significantly enriched for olfactory receptor genes in both species, suggesting that introgression may be a source of functional novelty even between species with high barriers to gene flow.
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Affiliation(s)
- Sarah E Banker
- Department of Integrative Biology and Museum of Vertebrate Zoology, University of California, Berkeley, Berkeley, CA, 94720, USA
| | - François Bonhomme
- Institut des Sciences de l'Evolution, Université de Montpellier, Montpellier, France
| | - Michael W Nachman
- Department of Integrative Biology and Museum of Vertebrate Zoology, University of California, Berkeley, Berkeley, CA, 94720, USA
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11
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Zhang W, Tautz D. Tracing the origin and evolutionary fate of recent gene retrocopies in natural populations of the house mouse. Mol Biol Evol 2021; 39:6481550. [PMID: 34940842 PMCID: PMC8826619 DOI: 10.1093/molbev/msab360] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022] Open
Abstract
Although the contribution of retrogenes to the evolution of genes and genomes has long been recognized, the evolutionary patterns of very recently derived retrocopies that are still polymorphic within natural populations have not been much studied so far. We use here a set of 2,025 such retrocopies in nine house mouse populations from three subspecies (Mus musculus domesticus, M. m. musculus, and M. m. castaneus) to trace their origin and evolutionary fate. We find that ancient house-keeping genes are significantly more likely to generate retrocopies than younger genes and that the propensity to generate a retrocopy depends on its level of expression in the germline. Although most retrocopies are detrimental and quickly purged, we focus here on the subset that appears to be neutral or even adaptive. We show that retrocopies from X-chromosomal parental genes have a higher likelihood to reach elevated frequencies in the populations, confirming the notion of adaptive effects for “out-of-X” retrogenes. Also, retrocopies in intergenic regions are more likely to reach higher population frequencies than those in introns of genes, implying a more detrimental effect when they land within transcribed regions. For a small subset of retrocopies, we find signatures of positive selection, indicating they were involved in a recent adaptation process. We show that the population-specific distribution pattern of retrocopies is phylogenetically informative and can be used to infer population history with a better resolution than with SNP markers.
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Affiliation(s)
- Wenyu Zhang
- Department of Evolutionary Genetics, Max Planck Institute for Evolutionary Biology, August-Thienemann-Str. 2, Plön, D-24306, Germany
| | - Diethard Tautz
- Department of Evolutionary Genetics, Max Planck Institute for Evolutionary Biology, August-Thienemann-Str. 2, Plön, D-24306, Germany
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12
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Lawal RA, Arora UP, Dumont BL. Selection shapes the landscape of functional variation in wild house mice. BMC Biol 2021; 19:239. [PMID: 34794440 PMCID: PMC8603481 DOI: 10.1186/s12915-021-01165-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2021] [Accepted: 10/14/2021] [Indexed: 11/30/2022] Open
Abstract
BACKGROUND Through human-aided dispersal over the last ~ 10,000 years, house mice (Mus musculus) have recently colonized diverse habitats across the globe, promoting the emergence of new traits that confer adaptive advantages in distinct environments. Despite their status as the premier mammalian model system, the impact of this demographic and selective history on the global patterning of disease-relevant trait variation in wild mouse populations is poorly understood. RESULTS Here, we leveraged 154 whole-genome sequences from diverse wild house mouse populations to survey the geographic organization of functional variation and systematically identify signals of positive selection. We show that a significant proportion of wild mouse variation is private to single populations, including numerous predicted functional alleles. In addition, we report strong signals of positive selection at many genes associated with both complex and Mendelian diseases in humans. Notably, we detect a significant excess of selection signals at disease-associated genes relative to null expectations, pointing to the important role of adaptation in shaping the landscape of functional variation in wild mouse populations. We also uncover strong signals of selection at multiple genes involved in starch digestion, including Mgam and Amy1. We speculate that the successful emergence of the human-mouse commensalism may have been facilitated, in part, by dietary adaptations at these loci. Finally, our work uncovers multiple cryptic structural variants that manifest as putative signals of positive selection, highlighting an important and under-appreciated source of false-positive signals in genome-wide selection scans. CONCLUSIONS Overall, our findings highlight the role of adaptation in shaping wild mouse genetic variation at human disease-associated genes. Our work also highlights the biomedical relevance of wild mouse genetic diversity and underscores the potential for targeted sampling of mice from specific populations as a strategy for developing effective new mouse models of both rare and common human diseases.
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Affiliation(s)
| | - Uma P Arora
- The Jackson Laboratory, 600 Main Street, Bar Harbor, Maine, 04609, USA
- Tufts University, Graduate School of Biomedical Sciences, 136 Harrison Ave, Boston, MA, 02111, USA
| | - Beth L Dumont
- The Jackson Laboratory, 600 Main Street, Bar Harbor, Maine, 04609, USA.
- Tufts University, Graduate School of Biomedical Sciences, 136 Harrison Ave, Boston, MA, 02111, USA.
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13
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Fornůsková A, Hiadlovská Z, Macholán M, Piálek J, de Bellocq JG. New Perspective on the Geographic Distribution and Evolution of Lymphocytic Choriomeningitis Virus, Central Europe. Emerg Infect Dis 2021; 27:2638-2647. [PMID: 34545789 PMCID: PMC8462312 DOI: 10.3201/eid2710.210224] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Lymphocytic choriomeningitis virus (LCMV) is an Old World mammarenavirus found worldwide because of its association with the house mouse. When LCMV spills over to immunocompetent humans, the virus can cause aseptic meningitis; in immunocompromised persons, systemic infection and death can occur. Central Europe is a strategic location for the study of LCMV evolutionary history and host specificity because of the presence of a hybrid zone (genetic barrier) between 2 house mouse subspecies, Mus musculus musculus and M. musculus domesticus. We report LCMV prevalence in natural mouse populations from a Czech Republic–Germany transect and genomic characterization of 2 new LCMV variants from the Czech Republic. We demonstrate that the main division in the LCMV phylogenetic tree corresponds to mouse host subspecies and, when the virus is found in human hosts, the mouse subspecies found at the spillover location. Therefore, LCMV strains infecting humans can be predicted by the genetic structure of house mice.
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Zhang JX, Wang M, Fan J, Guo ZP, Guan Y, Qu G, Zhang CJ, Guo YX, Yan X. Non-linear genetic diversity and notable population differentiation caused by low gene flow of bermudagrass [ Cynodon dactylon (L.) Pers.] along longitude gradients. PeerJ 2021; 9:e11953. [PMID: 34458022 PMCID: PMC8378333 DOI: 10.7717/peerj.11953] [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: 11/27/2020] [Accepted: 07/21/2021] [Indexed: 11/20/2022] Open
Abstract
Background Environmental variation related to ecological habitat is the main driver of plant adaptive divergence. Longitude plays an important role in the formation of plant population structure, indicating that environmental differentiation can significantly shape population structure. Methods Genetic diversity and population genetic structure were estimated using 105 expressed sequence tag-derived simple sequence repeat (EST-SSR) loci. A total of 249 C. dactylon (L.) Pers. (common bermudagrass) individuals were sampled from 13 geographic sites along the longitude (105°57′34″–119°27′06″E). Results There was no obvious linear trend of intra-population genetic diversity along longitude and the intra-population genetic diversity was not related to climate in this study. Low gene flow (Nm = 0.7701) meant a rich genetic differentiation among populations of C. dactylon along longitude gradients. Significantly positive Mantel correlation (r = 0.438, P = 0.001) was found between genetic distance and geographical interval while no significant partial Mantel correlation after controlling the effect of mean annual precipitation, which indicated geographic distance correlated with mean annual precipitation affect genetic distance. The genetic diversity of C. dactylon with higher ploidy level was higher than that with lower ploidy level and groups of individuals with higher ploidy level were separated further away by genetic distance from the lower ploidy levels. Understanding the different genetic bases of local adaptation comparatively between latitude and longitude is one of the core findings in the adaptive evolution of plants.
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Affiliation(s)
- Jing-Xue Zhang
- College of Animal Science and Technology, Yangzhou University, Yangzhou, Jiangsu, China.,College of Animal and Veterinary Science, Henan Agricultural University, Zhengzhou, Henan, China
| | - Miaoli Wang
- College of Animal and Veterinary Science, Henan Agricultural University, Zhengzhou, Henan, China
| | - Jibiao Fan
- College of Animal Science and Technology, Yangzhou University, Yangzhou, Jiangsu, China
| | - Zhi-Peng Guo
- College of Animal and Veterinary Science, Henan Agricultural University, Zhengzhou, Henan, China
| | - Yongzhuo Guan
- College of Animal and Veterinary Science, Henan Agricultural University, Zhengzhou, Henan, China
| | - Gen Qu
- College of Animal and Veterinary Science, Henan Agricultural University, Zhengzhou, Henan, China
| | - Chuan-Jie Zhang
- College of Animal Science and Technology, Yangzhou University, Yangzhou, Jiangsu, China
| | - Yu-Xia Guo
- College of Animal and Veterinary Science, Henan Agricultural University, Zhengzhou, Henan, China
| | - Xuebing Yan
- College of Animal Science and Technology, Yangzhou University, Yangzhou, Jiangsu, China
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15
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Boynton PJ, Wloch‐Salamon D, Landermann D, Stukenbrock EH. Forest Saccharomyces paradoxus are robust to seasonal biotic and abiotic changes. Ecol Evol 2021; 11:6604-6619. [PMID: 34141244 PMCID: PMC8207440 DOI: 10.1002/ece3.7515] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2020] [Revised: 02/25/2021] [Accepted: 03/16/2021] [Indexed: 01/02/2023] Open
Abstract
Microorganisms are famous for adapting quickly to new environments. However, most evidence for rapid microbial adaptation comes from laboratory experiments or domesticated environments, and it is unclear how rates of adaptation scale from human-influenced environments to the great diversity of wild microorganisms. We examined potential monthly-scale selective pressures in the model forest yeast Saccharomyces paradoxus. Contrary to expectations of seasonal adaptation, the S. paradoxus population was stable over four seasons in the face of abiotic and biotic environmental changes. While the S. paradoxus population was diverse, including 41 unique genotypes among 192 sampled isolates, there was no correlation between S. paradoxus genotypes and seasonal environments. Consistent with observations from other S. paradoxus populations, the forest population was highly clonal and inbred. This lack of recombination, paired with population stability, implies that selection is not acting on the forest S. paradoxus population on a seasonal timescale. Saccharomyces paradoxus may instead have evolved generalism or phenotypic plasticity with regard to seasonal environmental changes long ago. Similarly, while the forest population included diversity among phenotypes related to intraspecific interference competition, there was no evidence for active coevolution among these phenotypes. At least ten percent of the forest S. paradoxus individuals produced "killer toxins," which kill sensitive Saccharomyces cells, but the presence of a toxin-producing isolate did not predict resistance to the toxin among nearby isolates. How forest yeasts acclimate to changing environments remains an open question, and future studies should investigate the physiological responses that allow microbial cells to cope with environmental fluctuations in their native habitats.
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Affiliation(s)
- Primrose J. Boynton
- Biology DepartmentWheaton CollegeNortonMAUSA
- Environmental Genomics Research GroupMax‐Planck Institute for Evolutionary BiologyPlönGermany
| | - Dominika Wloch‐Salamon
- Faculty of BiologyInstitute of Environmental SciencesJagiellonian UniversityKrakówPoland
| | - Doreen Landermann
- Environmental Genomics Research GroupMax‐Planck Institute for Evolutionary BiologyPlönGermany
| | - Eva H. Stukenbrock
- Environmental Genomics Research GroupMax‐Planck Institute for Evolutionary BiologyPlönGermany
- Botanical InstituteChristian‐Albrechts UniversitätKielGermany
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16
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The mutational load in natural populations is significantly affected by high primary rates of retroposition. Proc Natl Acad Sci U S A 2021; 118:2013043118. [PMID: 33526666 PMCID: PMC8017666 DOI: 10.1073/pnas.2013043118] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
The phenomenon of retroposition (the reintegration of reverse-transcribed RNA into the genome) has been well studied in comparisons between species and has been identified as a source of evolutionary innovation. However, less attention has been paid to possible negative effects of retroposition. To trace the evolutionary dynamics of these negative effects, our study uses a unique genomic dataset of house mouse populations. It reveals that the initial retroposition rate is very high and that most of these newly transposed retrocopies have a deleterious impact, apparently through modifying the expression of their parental genes. In humans, this effect is expected to cause disease alleles, and we propose that genetic screening should include the search for newly transposed retrocopies. Gene retroposition is known to contribute to patterns of gene evolution and adaptations. However, possible negative effects of gene retroposition remain largely unexplored since most previous studies have focused on between-species comparisons where negatively selected copies are mostly not observed, as they are quickly lost from populations. Here, we show for natural house mouse populations that the primary rate of retroposition is orders of magnitude higher than the long-term rate. Comparisons with single-nucleotide polymorphism distribution patterns in the same populations show that most retroposition events are deleterious. Transcriptomic profiling analysis shows that new retroposed copies become easily subject to transcription and have an influence on the expression levels of their parental genes, especially when transcribed in the antisense direction. Our results imply that the impact of retroposition on the mutational load has been highly underestimated in natural populations. This has additional implications for strategies of disease allele detection in humans.
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17
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García-Rodríguez O, Hardouin EA, Hambleton E, Monteith J, Randall C, Richards MB, Edwards CJ, Stewart JR. Ancient mitochondrial DNA connects house mice in the British Isles to trade across Europe over three millennia. BMC Ecol Evol 2021; 21:9. [PMID: 33514313 PMCID: PMC7853306 DOI: 10.1186/s12862-021-01746-4] [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: 08/25/2020] [Accepted: 01/13/2021] [Indexed: 12/03/2022] Open
Abstract
Background The earliest records in Britain for the western European house mouse (Mus musculus domesticus) date from the Late Bronze Age. The arrival of this commensal species in Britain is thought to be related to human transport and trade with continental Europe. In order to study this arrival, we collected a total of 16 ancient mouse mandibulae from four early British archaeological sites, ranging from the Late Bronze Age to the Roman period. Results From these, we obtained ancient mitochondrial DNA (mtDNA) house mouse sequences from eight house mice from two of the sites dating from the Late Bronze to Middle Iron Age. We also obtained five ancient mtDNA wood mouse (Apodemus spp.) sequences from all four sites. The ancient house mouse sequences found in this study were from haplogroups E (N = 6) and D (N = 2). Modern British house mouse mtDNA sequences are primarily characterised by haplogroups E and F and, much less commonly, haplogroup D. Conclusions The presence of haplogroups D and E in our samples and the dating of the archaeological sites provide evidence of an early house mouse colonisation that may relate to Late Bronze Age/Iron Age trade and/or human expansion. Our results confirm the hypothesis, based on zooarchaeological evidence and modern mtDNA predictions, that house mice, with haplogroups D and E, were established in Britain by the Iron Age and, in the case of haplogroup E, possibly as early as the Late Bronze Age.
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Affiliation(s)
- Oxala García-Rodríguez
- Faculty of Science and Technology, Bournemouth University, Christchurch House, Talbot Campus, Poole, BH12 5BB, Dorset, UK.
| | - Emilie A Hardouin
- Faculty of Science and Technology, Bournemouth University, Christchurch House, Talbot Campus, Poole, BH12 5BB, Dorset, UK
| | - Ellen Hambleton
- Faculty of Science and Technology, Bournemouth University, Christchurch House, Talbot Campus, Poole, BH12 5BB, Dorset, UK
| | - Jonathan Monteith
- Faculty of Science and Technology, Bournemouth University, Christchurch House, Talbot Campus, Poole, BH12 5BB, Dorset, UK
| | - Clare Randall
- Faculty of Science and Technology, Bournemouth University, Christchurch House, Talbot Campus, Poole, BH12 5BB, Dorset, UK
| | - Martin B Richards
- Department of Biological and Geographical Sciences, School of Applied Sciences, University of Huddersfield, Huddersfield, UK
| | - Ceiridwen J Edwards
- Department of Biological and Geographical Sciences, School of Applied Sciences, University of Huddersfield, Huddersfield, UK
| | - John R Stewart
- Faculty of Science and Technology, Bournemouth University, Christchurch House, Talbot Campus, Poole, BH12 5BB, Dorset, UK
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Cucchi T, Papayianni K, Cersoy S, Aznar-Cormano L, Zazzo A, Debruyne R, Berthon R, Bălășescu A, Simmons A, Valla F, Hamilakis Y, Mavridis F, Mashkour M, Darvish J, Siahsarvi R, Biglari F, Petrie CA, Weeks L, Sardari A, Maziar S, Denys C, Orton D, Jenkins E, Zeder M, Searle JB, Larson G, Bonhomme F, Auffray JC, Vigne JD. Tracking the Near Eastern origins and European dispersal of the western house mouse. Sci Rep 2020; 10:8276. [PMID: 32427845 PMCID: PMC7237409 DOI: 10.1038/s41598-020-64939-9] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2019] [Accepted: 04/24/2020] [Indexed: 11/13/2022] Open
Abstract
The house mouse (Mus musculus) represents the extreme of globalization of invasive mammals. However, the timing and basis of its origin and early phases of dispersal remain poorly documented. To track its synanthropisation and subsequent invasive spread during the develoment of complex human societies, we analyzed 829 Mus specimens from 43 archaeological contexts in Southwestern Asia and Southeastern Europe, between 40,000 and 3,000 cal. BP, combining geometric morphometrics numerical taxonomy, ancient mitochondrial DNA and direct radiocarbon dating. We found that large late hunter-gatherer sedentary settlements in the Levant, c. 14,500 cal. BP, promoted the commensal behaviour of the house mouse, which probably led the commensal pathway to cat domestication. House mouse invasive spread was then fostered through the emergence of agriculture throughout the Near East 12,000 years ago. Stowaway transport of house mice to Cyprus can be inferred as early as 10,800 years ago. However, the house mouse invasion of Europe did not happen until the development of proto urbanism and exchange networks - 6,500 years ago in Eastern Europe and 4000 years ago in Southern Europe - which in turn may have driven the first human mediated dispersal of cats in Europe.
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Affiliation(s)
- Thomas Cucchi
- Archéozoologie, Archéobotanique: Sociétés, Pratiques et Environnements (AASPE), UMR 7209, CNRS, Muséum national d'Histoire naturelle, Paris, France.
| | - Katerina Papayianni
- Archéozoologie, Archéobotanique: Sociétés, Pratiques et Environnements (AASPE), UMR 7209, CNRS, Muséum national d'Histoire naturelle, Paris, France
- Malcolm H. Wiener Laboratory for Archaeological Science, American School of Classical Studies, Souidias 54, 10676, Athens, Greece
| | - Sophie Cersoy
- Centre de Recherche sur la Conservation (CRC), Muséum national d'Histoire naturelle, CNRS, Ministère de la Culture, CP 21, 36 rue Geoffroy Saint-Hilaire, 75005, Paris, France
| | - Laetitia Aznar-Cormano
- Centre de recherche en Paléontologie Paris, UMR7207, Muséum national d'Histoire naturelle, CNRS, Sorbonne Université, 8 rue Buffon, 75005, Paris, France
| | - Antoine Zazzo
- Archéozoologie, Archéobotanique: Sociétés, Pratiques et Environnements (AASPE), UMR 7209, CNRS, Muséum national d'Histoire naturelle, Paris, France
| | - Régis Debruyne
- DGD-REVE, Muséum national d'Histoire naturelle, 17 Place du Trocadéro, bureau E205, 75016, Paris, France
| | - Rémi Berthon
- Archéozoologie, Archéobotanique: Sociétés, Pratiques et Environnements (AASPE), UMR 7209, CNRS, Muséum national d'Histoire naturelle, Paris, France
| | - Adrian Bălășescu
- Vasile Pârvan, Institute of Archaeology, Romanian Academy, 11 Henri Coandă Street, Bucarest, Romania
| | - Alan Simmons
- Department of Anthropology, University of Nevada, Las Vegas/Desert Research Institute, Reno, Nevada, USA
| | - François Valla
- Archéologies et Sciences de l'Antiquité (Arscan), UMR 7041 CNRS, Université de Paris Nanterre, Paris I, 92023, Nanterre, France
| | - Yannis Hamilakis
- Joukowsky Institute for Archaeology and the Ancient World, Brown University, Box 1837, 60 George Street, Providence, RI, 02912, USA
| | - Fanis Mavridis
- Ephorate of Palaeoanthropology and Speleology, Hellenic Ministry of Culture and Sports, Ardittou 34B, 11636, Athens, Greece
| | - Marjan Mashkour
- Archéozoologie, Archéobotanique: Sociétés, Pratiques et Environnements (AASPE), UMR 7209, CNRS, Muséum national d'Histoire naturelle, Paris, France
| | - Jamshid Darvish
- Department of Biology, Faculty of Sciences, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Roohollah Siahsarvi
- Department of Biology, Faculty of Sciences, Ferdowsi University of Mashhad, Mashhad, Iran
| | | | - Cameron A Petrie
- Department of Archaeology and Anthropology, University of Cambridge, Downing Street, Cambridge, CB2 3DZ, UK
| | - Lloyd Weeks
- Archaeology, School of HASS, University of New England, Armidale, NSW, 2351, Australia
| | - Alireza Sardari
- Research Institute of Cultural Heritage and Tourism (RICHT), Iranian Center for Archaeological Research (ICAR), Tehran, Iran
| | - Sepideh Maziar
- Near Eastern Archaeology, Institute für Archäologie Wissenschaften, Johann Wolfgang Goethe Universität, Frankfurt am Main, Germany
| | - Christiane Denys
- Institut de Systématique, Evolution, Biodiversité (ISYEB), UMR 7205, Muséum national d'Histoire naturelle, Sorbonne Université, Ecole Pratique des Hautes Etudes, Université des Antilles, CNRS, Paris, France
| | - David Orton
- BioArCh, Department of Archaeology, University of York, York, YO10 5DD, UK
| | - Emma Jenkins
- Institute for the Modelling of Socio-Environmental Transitions, Bournemouth University, Talbot Campus, Poole, BH12 5BB, UK
| | - Melinda Zeder
- Department of Anthropology, National Museum of Natural History, Smithsonian Institution, Washington, District of Columbia, USA
| | - Jeremy B Searle
- Department of Ecology and Evolutionary Biology, Corson Hall, Cornell University, Ithaca, NY, 14853-2701, USA
| | - Greger Larson
- Palaeogenomics and Bio-Archaeology Research Network, School of Archaeology, University of Oxford, Oxford, OX1 3TG, UK
| | - François Bonhomme
- Institut des Sciences de l'Evolution (ISEM), UMR 4554, CNRS, IRD, EPHE, Université de Montpellier, Montpellier, France
| | - Jean-Christophe Auffray
- Institut des Sciences de l'Evolution (ISEM), UMR 4554, CNRS, IRD, EPHE, Université de Montpellier, Montpellier, France
| | - Jean-Denis Vigne
- Archéozoologie, Archéobotanique: Sociétés, Pratiques et Environnements (AASPE), UMR 7209, CNRS, Muséum national d'Histoire naturelle, Paris, France
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19
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Linnenbrink M, Ullrich KK, McConnell E, Tautz D. The amylase gene cluster in house mice (Mus musculus) was subject to repeated introgression including the rescue of a pseudogene. BMC Evol Biol 2020; 20:56. [PMID: 32414322 PMCID: PMC7227347 DOI: 10.1186/s12862-020-01624-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Accepted: 05/04/2020] [Indexed: 12/14/2022] Open
Abstract
Background Amylase gene clusters have been implicated in adaptive copy number changes in response to the amount of starch in the diet of humans and mammals. However, this interpretation has been questioned for humans and for mammals there is a paucity of information from natural populations. Results Using optical mapping and genome read information, we show here that the amylase cluster in natural house mouse populations is indeed copy-number variable for Amy2b paralogous gene copies (called Amy2a1 - Amy2a5), but a direct connection to starch diet is not evident. However, we find that the amylase cluster was subject to introgression of haplotypes between Mus musculus sub-species. A very recent introgression can be traced in the Western European populations and this leads also to the rescue of an Amy2b pseudogene. Some populations and inbred lines derived from the Western house mouse (Mus musculus domesticus) harbor a copy of the pancreatic amylase (Amy2b) with a stop codon in the first exon, making it non-functional. But populations in France harbor a haplotype introgressed from the Eastern house mouse (M. m. musculus) with an intact reading frame. Detailed analysis of phylogenetic patterns along the amylase cluster suggest an additional history of previous introgressions. Conclusions Our results show that the amylase gene cluster is a hotspot of introgression in the mouse genome, making it an evolutionary active region beyond the previously observed copy number changes.
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Affiliation(s)
| | | | - Ellen McConnell
- Max-Planck Institute for Evolutionary Biology, 24306, Plön, Germany
| | - Diethard Tautz
- Max-Planck Institute for Evolutionary Biology, 24306, Plön, Germany.
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20
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Abstract
Mice (Mus musculus) and rats (Rattus norvegicus) have long served as model systems for biomedical research. However, they are also excellent models for studying the evolution of populations, subspecies, and species. Within the past million years, they have spread in various waves across large parts of the globe, with the most recent spread in the wake of human civilization. They have developed into commensal species, but have also been able to colonize extreme environments on islands free of human civilization. Given that ample genomic and genetic resources are available for these species, they have thus also become ideal mammalian systems for evolutionary studies on adaptation and speciation, particularly in the combination with the rapid developments in population genomics. The chapter provides an overview of the systems and their history, as well as of available resources.
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Affiliation(s)
- Kristian K Ullrich
- Department of Evolutionary Genetics, Max Planck Institute for Evolutionary Biology, Plön, Germany.
| | - Diethard Tautz
- Department of Evolutionary Genetics, Max Planck Institute for Evolutionary Biology, Plön, Germany
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21
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Boynton PJ, Kowallik V, Landermann D, Stukenbrock EH. Quantifying the efficiency and biases of forest Saccharomyces sampling strategies. Yeast 2019; 36:657-668. [PMID: 31348543 DOI: 10.1002/yea.3435] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2019] [Revised: 07/18/2019] [Accepted: 07/19/2019] [Indexed: 12/12/2022] Open
Abstract
Saccharomyces yeasts are emerging as model organisms for ecology and evolution, and researchers need environmental Saccharomyces isolates to test ecological and evolutionary hypotheses. However, methods for isolating Saccharomyces from nature have not been standardized, and isolation methods may influence the genotypes and phenotypes of studied strains. We compared the effectiveness and potential biases of an established enrichment culturing method against a newly developed direct plating method for isolating forest floor Saccharomyces spp. In a European forest, enrichment culturing was both less successful at isolating Saccharomyces paradoxus per sample collected and less labour intensive per isolated S. paradoxus colony than direct isolation. The two methods sampled similar S. paradoxus diversity: The number of unique genotypes sampled (i.e., genotypic diversity) per S. paradoxus isolate and average growth rates of S. paradoxus isolates did not differ between the two methods, and growth rate variances (i.e., phenotypic diversity) only differed in one of three tested environments. However, enrichment culturing did detect rare Saccharomyces cerevisiae in the forest habitat and also found two S. paradoxus isolates with outlier phenotypes. Our results validate the historically common method of using enrichment culturing to isolate representative collections of environmental Saccharomyces. We recommend that researchers choose a Saccharomyces sampling method based on resources available for sampling and isolate screening. Researchers interested in discovering new Saccharomyces phenotypes or rare Saccharomyces species from natural environments may also have more success using enrichment culturing. We include step-by-step sampling protocols in the supplemental materials.
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Affiliation(s)
- Primrose J Boynton
- Environmental Genomics Research Group, Max-Planck Institute for Evolutionary Biology, Plön, Germany
| | - Vienna Kowallik
- Ecology and Evolution Unit, Okinawa Institute of Science and Technology, Okinawa, Japan
| | - Doreen Landermann
- Environmental Genomics Research Group, Max-Planck Institute for Evolutionary Biology, Plön, Germany
| | - Eva H Stukenbrock
- Environmental Genomics Research Group, Max-Planck Institute for Evolutionary Biology, Plön, Germany.,Botanisches Institut, Christian-Albrechts Universität, Botanisches Institut, Kiel, Germany
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22
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Yusefi GH, Faizolahi K, Darvish J, Safi K, Brito JC. The species diversity, distribution, and conservation status of the terrestrial mammals of Iran. J Mammal 2019. [DOI: 10.1093/jmammal/gyz002] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Affiliation(s)
- Gholam Hosein Yusefi
- CIBIO/InBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos da, Universidade do Porto, R. Padre Armando Quintas, Vairão, Portugal
- Departamento de Biologia da Faculdade de Ciências da, Universidade do Porto, R. Campo Alegre, Porto, Portugal
- Mohitban Society, Tehran, Iran
| | - Kaveh Faizolahi
- Paazan, Iranian Mammal Quarterly, Tavana Building, Khanbabaee Aly., Ashrafi Esfahani str., Tehran, Iran
| | - Jamshid Darvish
- Department of Biology, Faculty of Sciences, Ferdowsi University of Mashhad, Mashhad, Iran
- Rodentology Research Department, Institute of Applied Zoology, Faculty of Sciences, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Kamran Safi
- Max Planck Institute for Ornithology, Vogelwarte Radolfzell, Radolfzell, Germany
- Department of Biology, University of Konstanz, Konstanz, Germany
| | - José Carlos Brito
- CIBIO/InBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos da, Universidade do Porto, R. Padre Armando Quintas, Vairão, Portugal
- Departamento de Biologia da Faculdade de Ciências da, Universidade do Porto, R. Campo Alegre, Porto, Portugal
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23
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24
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Phylogeography of the black rat Rattus rattus in India and the implications for its dispersal history in Eurasia. Biol Invasions 2018. [DOI: 10.1007/s10530-018-1830-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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25
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Bekpen C, Xie C, Tautz D. Dealing with the adaptive immune system during de novo evolution of genes from intergenic sequences. BMC Evol Biol 2018; 18:121. [PMID: 30075701 PMCID: PMC6091031 DOI: 10.1186/s12862-018-1232-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2018] [Accepted: 07/16/2018] [Indexed: 12/26/2022] Open
Abstract
Background The adaptive immune system of vertebrates has an extraordinary potential to sense and neutralize foreign antigens entering the body. De novo evolution of genes implies that the genome itself expresses novel antigens from intergenic sequences which could cause a problem with this immune system. Peptides from these novel proteins could be presented by the major histocompatibility complex (MHC) receptors to the cell surface and would be recognized as foreign. The respective cells would then be attacked and destroyed, or would cause inflammatory responses. Hence, de novo expressed peptides have to be introduced to the immune system as being self-peptides to avoid such autoimmune reactions. The regulation of the distinction between self and non-self starts during embryonic development, but continues late into adulthood. It is mostly mediated by specialized cells in the thymus, but can also be conveyed in peripheral tissues, such as the lymph nodes and the spleen. The self-antigens need to be exposed to the reactive T-cells, which requires the expression of the genes in the respective tissues. Since the initial activation of a promotor for new intergenic transcription of a de novo gene could occur in any tissue, we should expect that the evolutionary establishment of a de novo gene in animals with an adaptive immune system should also involve expression in at least one of the tissues that confer self-recognition. Results We have studied this question by analyzing the transcriptomes of multiple tissues from young mice in three closely related natural populations of the house mouse (M. m. domesticus). We find that new intergenic transcription occurs indeed mostly in only a single tissue. When a second tissue becomes involved, thymus and spleen are significantly overrepresented. Conclusions We conclude that the inclusion of de novo transcripts in the processes for the induction of self-tolerance is indeed an important step in the evolution of functional de novo genes in vertebrates. Electronic supplementary material The online version of this article (10.1186/s12862-018-1232-z) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Cemalettin Bekpen
- Max-Planck Institute for Evolutionary Biology, August-Thienemannstr. 2, 24306, Plön, Germany
| | - Chen Xie
- Max-Planck Institute for Evolutionary Biology, August-Thienemannstr. 2, 24306, Plön, Germany
| | - Diethard Tautz
- Max-Planck Institute for Evolutionary Biology, August-Thienemannstr. 2, 24306, Plön, Germany.
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26
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Linnenbrink M, Teschke M, Montero I, Vallier M, Tautz D. Meta-populational demes constitute a reservoir for large MHC allele diversity in wild house mice ( Mus musculus). Front Zool 2018; 15:15. [PMID: 29721030 PMCID: PMC5910556 DOI: 10.1186/s12983-018-0266-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Accepted: 04/10/2018] [Indexed: 12/12/2022] Open
Abstract
Background The MHC class I and II loci mediate the adaptive immune response and belong to the most polymorphic loci in vertebrate genomes. In fact, the number of different alleles in a given species is often so large that it remains a challenge to provide an evolutionary model that can fully account for this. Results We provide here a general survey of MHC allele numbers in house mouse populations and two sub-species (M. m. domesticus and M. m. musculus) for H2 class I D and K, as well as class II A and E loci. Between 50 and 90% of the detected different sequences constitute new alleles, confirming that the discovery of new alleles is indeed far from complete. House mice live in separate demes with small effective population sizes, factors that were proposed to reduce, rather than enhance the possibility for the maintenance of many different alleles. To specifically investigate the occurrence of alleles within demes, we focused on the class II H2-Aa and H2-Eb exon 2 alleles in nine demes of M. m. domesticus from two different geographic regions. We find on the one hand a group of alleles that occur in different sampling regions and three quarters of these are also found in both sub-species. On the other hand, the larger group of different alleles (56%) occurs only in one of the regions and most of these (89%) only in single demes. We show that most of these region-specific alleles have apparently arisen through recombination and/or partial gene conversion from already existing alleles. Conclusions Demes can act as sources of alleles that outnumber the set of alleles that are shared across the species range. These findings support the reservoir model proposed for human MHC diversity, which states that large pools of rare MHC allele variants are continuously generated by neutral mutational mechanisms. Given that these can become important in the defense against newly emerging pathogens, the reservoir model complements the selection based models for MHC diversity and explains why the exceptional diversity exists. Electronic supplementary material The online version of this article (10.1186/s12983-018-0266-9) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Miriam Linnenbrink
- 3Max-Planck Institute for Evolutionary Biology, August-Thienemannstrasse 2, 24306 Plön, Germany
| | - Meike Teschke
- 1Present address: Deutsche Forschungsgemeinschaft, 53170 Bonn, Germany.,3Max-Planck Institute for Evolutionary Biology, August-Thienemannstrasse 2, 24306 Plön, Germany
| | - Inka Montero
- 2Present address: Medical Faculty, Eberhard Karls Universität Tübingen, Tübingen, Germany.,3Max-Planck Institute for Evolutionary Biology, August-Thienemannstrasse 2, 24306 Plön, Germany
| | - Marie Vallier
- 3Max-Planck Institute for Evolutionary Biology, August-Thienemannstrasse 2, 24306 Plön, Germany
| | - Diethard Tautz
- 3Max-Planck Institute for Evolutionary Biology, August-Thienemannstrasse 2, 24306 Plön, Germany
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27
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Reconciling the biogeography of an invader through recent and historic genetic patterns: the case of topmouth gudgeon Pseudorasbora parva. Biol Invasions 2018. [DOI: 10.1007/s10530-018-1693-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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28
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Veale AJ, Russell JC, King CM. The genomic ancestry, landscape genetics and invasion history of introduced mice in New Zealand. ROYAL SOCIETY OPEN SCIENCE 2018; 5:170879. [PMID: 29410804 PMCID: PMC5792881 DOI: 10.1098/rsos.170879] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/11/2017] [Accepted: 12/15/2017] [Indexed: 06/07/2023]
Abstract
The house mouse (Mus musculus) provides a fascinating system for studying both the genomic basis of reproductive isolation, and the patterns of human-mediated dispersal. New Zealand has a complex history of mouse invasions, and the living descendants of these invaders have genetic ancestry from all three subspecies, although most are primarily descended from M. m. domesticus. We used the GigaMUGA genotyping array (approximately 135 000 loci) to describe the genomic ancestry of 161 mice, sampled from 34 locations from across New Zealand (and one Australian city-Sydney). Of these, two populations, one in the south of the South Island, and one on Chatham Island, showed complete mitochondrial lineage capture, featuring two different lineages of M. m. castaneus mitochondrial DNA but with only M. m. domesticus nuclear ancestry detectable. Mice in the northern and southern parts of the North Island had small traces (approx. 2-3%) of M. m. castaneus nuclear ancestry, and mice in the upper South Island had approximately 7-8% M. m. musculus nuclear ancestry including some Y-chromosomal ancestry-though no detectable M. m. musculus mitochondrial ancestry. This is the most thorough genomic study of introduced populations of house mice yet conducted, and will have relevance to studies of the isolation mechanisms separating subspecies of mice.
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Affiliation(s)
- Andrew J. Veale
- Department of Environmental and Animal Sciences, Unitec, 139 Carrington Road, Auckland 1025, New Zealand
| | - James C. Russell
- School of Biological Sciences, University of Auckland, Private Bag 92019, Auckland Mail Centre, Auckland 1142, New Zealand
| | - Carolyn M. King
- Environmental Research Institute, School of Science, University of Waikato, Private Bag 2105, Hamilton 3240, New Zealand
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29
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Bibi S, Nadeem MS, Wiewel AS, Beg MA, Hameed K, Jabeen M, Raja GK. Mitochondrial Genetic Diversity and Phylogeography of Mus musculus castaneus in Northern Punjab, Pakistan. Zoolog Sci 2017; 34:490-497. [PMID: 29219045 DOI: 10.2108/zs170086] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Regions of Iran, Afghanistan, Pakistan and northwestern India have been proposed as the place of origin of Mus musculus castaneus. But despite the fact that Pakistan encompasses an important part of its range, M. m. castaneus populations in Pakistan have not been the subject of intensive genetic and biogeographic studies, except for a very small number of samples included in past studies. We studied genetic variation in M. m. castaneus (CAS) from northern Punjab Province, Pakistan, by using cytochrome b (Cytb) analysis in a sample of 98 individuals. Median-joining network revealed four well differentiated CAS sub-lineages coexisting within a small geographical region; these had previously been thought to have largely non-overlapping geographic distributions. Moreover, haplotypes from Pakistan occupied a central position in the network and all identified global haplotypes were also present in Pakistan. All identified CAS sub-lineages proved to be highly diverse on the basis of haplotype and nucleotide diversity indices. Tajima's D test and Fu's Fs tests of neutrality suggest recent population expansions in all sub-lineages. Expansion times were estimated as 21,760-134,930, 10,800-64,400 and 4950-30,665 ybp using substitution rates of 2.5%, 5% and 11%, respectively. Our results support the hypothesis that northern Punjab Province in Pakistan is the most likely source area for M. m. castaneus, and that the CAS sub-lineages in this region have undergone rapid population expansion events at different time periods, which appear to have benefitted from human-mediated transport, although one of them clearly predates the establishment of human settlements in this region.
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Affiliation(s)
- Shahnaz Bibi
- 1 Zoology Department, PMAS-Arid Agriculture University Rawalpindi, Rawalpindi 46300, Pakistan
| | - Muhammad Sajid Nadeem
- 1 Zoology Department, PMAS-Arid Agriculture University Rawalpindi, Rawalpindi 46300, Pakistan
| | | | - Mirza Azhar Beg
- 1 Zoology Department, PMAS-Arid Agriculture University Rawalpindi, Rawalpindi 46300, Pakistan
| | - Khalid Hameed
- 3 Mirpur University of Science and Technology, Mirpur Azad Jammu and Kashmir 10250, Pakistan
| | | | - Ghazala Kaukab Raja
- 5 Department of Biochemistry, PMAS-Arid Agriculture University Rawalpindi, Rawalpindi 46300, Pakistan
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30
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Britton-Davidian J, Caminade P, Davidian E, Pagès M. Does chromosomal change restrict gene flow between house mouse populations (Mus musculus domesticus)? Evidence from microsatellite polymorphisms. Biol J Linn Soc Lond 2017. [DOI: 10.1093/biolinnean/blx053] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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31
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Chang PL, Kopania E, Keeble S, Sarver BAJ, Larson E, Orth A, Belkhir K, Boursot P, Bonhomme F, Good JM, Dean MD. Whole exome sequencing of wild-derived inbred strains of mice improves power to link phenotype and genotype. Mamm Genome 2017; 28:416-425. [PMID: 28819774 DOI: 10.1007/s00335-017-9704-9] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2017] [Accepted: 06/23/2017] [Indexed: 12/30/2022]
Abstract
The house mouse is a powerful model to dissect the genetic basis of phenotypic variation, and serves as a model to study human diseases. Despite a wealth of discoveries, most classical laboratory strains have captured only a small fraction of genetic variation known to segregate in their wild progenitors, and existing strains are often related to each other in complex ways. Inbred strains of mice independently derived from natural populations have the potential to increase power in genetic studies with the addition of novel genetic variation. Here, we perform exome-enrichment and high-throughput sequencing (~8× coverage) of 26 wild-derived strains known in the mouse research community as the "Montpellier strains." We identified 1.46 million SNPs in our dataset, approximately 19% of which have not been detected from other inbred strains. This novel genetic variation is expected to contribute to phenotypic variation, as they include 18,496 nonsynonymous variants and 262 early stop codons. Simulations demonstrate that the higher density of genetic variation in the Montpellier strains provides increased power for quantitative genetic studies. Inasmuch as the power to connect genotype to phenotype depends on genetic variation, it is important to incorporate these additional genetic strains into future research programs.
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Affiliation(s)
- Peter L Chang
- Molecular and Computational Biology, University of Southern California, 1050 Childs Way, Los Angeles, CA, 90089, USA
| | - Emily Kopania
- Molecular and Computational Biology, University of Southern California, 1050 Childs Way, Los Angeles, CA, 90089, USA.,Division of Biological Sciences, University of Montana, Missoula, MT, USA
| | - Sara Keeble
- Molecular and Computational Biology, University of Southern California, 1050 Childs Way, Los Angeles, CA, 90089, USA.,Division of Biological Sciences, University of Montana, Missoula, MT, USA
| | - Brice A J Sarver
- Division of Biological Sciences, University of Montana, Missoula, MT, USA
| | - Erica Larson
- Division of Biological Sciences, University of Montana, Missoula, MT, USA.,Department of Biological Sciences, University of Denver, Denver, CO, 80210, USA
| | - Annie Orth
- Institut des Sciences de l'Evolution, CNRS UMR554, Université de Montpellier, Montpellier, France
| | - Khalid Belkhir
- Institut des Sciences de l'Evolution, CNRS UMR554, Université de Montpellier, Montpellier, France
| | - Pierre Boursot
- Institut des Sciences de l'Evolution, CNRS UMR554, Université de Montpellier, Montpellier, France
| | - François Bonhomme
- Institut des Sciences de l'Evolution, CNRS UMR554, Université de Montpellier, Montpellier, France
| | - Jeffrey M Good
- Division of Biological Sciences, University of Montana, Missoula, MT, USA
| | - Matthew D Dean
- Molecular and Computational Biology, University of Southern California, 1050 Childs Way, Los Angeles, CA, 90089, USA.
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Adhikari P, Han SH, Kim YK, Kim TW, Thapa TB, Subedi N, Adhikari P, Oh HS. First molecular evidence of Mus musculus bactrianus in Nepal inferred from the mitochondrial DNA cytochrome B gene sequences. Mitochondrial DNA A DNA Mapp Seq Anal 2017; 29:561-566. [PMID: 28524717 DOI: 10.1080/24701394.2017.1320994] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
To identify the house mice collected in Pokhara and Lumbini of Nepal at the subspecies level, morphological and molecular analyses were carried out. Morphologically, two populations collected in Pokhara and Lumbini were distinguished by fur colour, but there was no significant difference in external measurements (p > .05). The phylogenetic analysis results revealed that the haplotypes sequences of mitochondrial DNA (mtDNA) Cytochrome B (CytB) gene distinguished into two distinct clades on a phylogenetic tree representing two subspecies, Mus musculus bactrianus and M. m. castaneus in Pokhara and Lumbini, respectively. In Nepal, the subspecies M. m. bactrianus was not reported before this study. These findings concluded that at least two subspecies, M. m. bactrianus and M. m. castaneus currently exist in Nepal. We estimated that these two subspecies could have introduced together with human migration, while further study is required to understand their evolutionary history and current distribution.
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Affiliation(s)
- Pradeep Adhikari
- a Faculty of Science Education, Jeju National University , Jeju-si , Republic of Korea
| | - Sang-Hyun Han
- b National Institute of Animal Science , Jeju-si , Republic of Korea
| | - Yoo-Kyung Kim
- a Faculty of Science Education, Jeju National University , Jeju-si , Republic of Korea
| | - Tae-Wook Kim
- a Faculty of Science Education, Jeju National University , Jeju-si , Republic of Korea
| | - Tej Bahadur Thapa
- c Central Department of Zoology , Tribhuvan University , Kirtipur , Nepal
| | - Naresh Subedi
- d National Trust for Nature Conservation , Lalitpur , Nepal
| | | | - Hong-Shik Oh
- a Faculty of Science Education, Jeju National University , Jeju-si , Republic of Korea
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33
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Ledevin R, Chevret P, Ganem G, Britton-Davidian J, Hardouin EA, Chapuis JL, Pisanu B, da Luz Mathias M, Schlager S, Auffray JC, Renaud S. Phylogeny and adaptation shape the teeth of insular mice. Proc Biol Sci 2017; 283:rspb.2015.2820. [PMID: 26842576 DOI: 10.1098/rspb.2015.2820] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
By accompanying human travels since prehistorical times, the house mouse dispersed widely throughout the world, and colonized many islands. The origin of the travellers determined the phylogenetic source of the insular mice, which encountered diverse ecological and environmental conditions on the various islands. Insular mice are thus an exceptional model to disentangle the relative role of phylogeny, ecology and climate in evolution. Molar shape is known to vary according to phylogeny and to respond to adaptation. Using for the first time a three-dimensional geometric morphometric approach, compared with a classical two-dimensional quantification, the relative effects of size variation, phylogeny, climate and ecology were investigated on molar shape diversity across a variety of islands. Phylogeny emerged as the factor of prime importance in shaping the molar. Changes in competition level, mostly driven by the presence or absence of the wood mouse on the different islands, appeared as the second most important effect. Climate and size differences accounted for slight shape variation. This evidences a balanced role of random differentiation related to history of colonization, and of adaptation possibly related to resource exploitation.
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Affiliation(s)
- Ronan Ledevin
- Laboratoire de Biométrie et Biologie Evolutive, UMR 5558, CNRS, Université Lyon 1, Campus de la Doua, Villeurbanne 69622, France
| | - Pascale Chevret
- Laboratoire de Biométrie et Biologie Evolutive, UMR 5558, CNRS, Université Lyon 1, Campus de la Doua, Villeurbanne 69622, France
| | - Guila Ganem
- Institut des Sciences de l'Evolution de Montpellier, UMR 5554, Université Montpellier, CNRS, IRD, EPHE, Montpellier 34095, France
| | - Janice Britton-Davidian
- Institut des Sciences de l'Evolution de Montpellier, UMR 5554, Université Montpellier, CNRS, IRD, EPHE, Montpellier 34095, France
| | - Emilie A Hardouin
- Faculty of Sciences and Technology, Bournemouth University, Christchurch House, Talbot Campus, Poole, Dorset BH12 5BB, UK
| | - Jean-Louis Chapuis
- Centre d'Ecologie et des Sciences de la Conservation, UMR 7204, Muséum National d'Histoire, Naturelle, 61 rue Buffon, Paris 75005, France
| | - Benoit Pisanu
- Centre d'Ecologie et des Sciences de la Conservation, UMR 7204, Muséum National d'Histoire, Naturelle, 61 rue Buffon, Paris 75005, France
| | - Maria da Luz Mathias
- Centro de Estudos do Ambiente e Mar and Departamento de Biologia Animal, Faculdade de Ciências da Universidade de Lisboa, Campo Grande, Lisboa 1749-016, Portugal
| | - Stefan Schlager
- Anthropologie, Medizinische Fakultät der Albert Ludwigs, Universität Freiburg, Freiburg 79104, Germany
| | - Jean-Christophe Auffray
- Institut des Sciences de l'Evolution de Montpellier, UMR 5554, Université Montpellier, CNRS, IRD, EPHE, Montpellier 34095, France
| | - Sabrina Renaud
- Laboratoire de Biométrie et Biologie Evolutive, UMR 5558, CNRS, Université Lyon 1, Campus de la Doua, Villeurbanne 69622, France
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34
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Harr B, Karakoc E, Neme R, Teschke M, Pfeifle C, Pezer Ž, Babiker H, Linnenbrink M, Montero I, Scavetta R, Abai MR, Molins MP, Schlegel M, Ulrich RG, Altmüller J, Franitza M, Büntge A, Künzel S, Tautz D. Genomic resources for wild populations of the house mouse, Mus musculus and its close relative Mus spretus. Sci Data 2016; 3:160075. [PMID: 27622383 PMCID: PMC5020872 DOI: 10.1038/sdata.2016.75] [Citation(s) in RCA: 87] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2016] [Accepted: 07/29/2016] [Indexed: 12/20/2022] Open
Abstract
Wild populations of the house mouse (Mus musculus) represent the raw genetic material for the classical inbred strains in biomedical research and are a major model system for evolutionary biology. We provide whole genome sequencing data of individuals representing natural populations of M. m. domesticus (24 individuals from 3 populations), M. m. helgolandicus (3 individuals), M. m. musculus (22 individuals from 3 populations) and M. spretus (8 individuals from one population). We use a single pipeline to map and call variants for these individuals and also include 10 additional individuals of M. m. castaneus for which genomic data are publically available. In addition, RNAseq data were obtained from 10 tissues of up to eight adult individuals from each of the three M. m. domesticus populations for which genomic data were collected. Data and analyses are presented via tracks viewable in the UCSC or IGV genome browsers. We also provide information on available outbred stocks and instructions on how to keep them in the laboratory.
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Affiliation(s)
- Bettina Harr
- Max-Planck Institute for Evolutionary Biology, August-Thienemanstrasse 2, 24306 Plön, Germany
| | - Emre Karakoc
- Max-Planck Institute for Evolutionary Biology, August-Thienemanstrasse 2, 24306 Plön, Germany
| | - Rafik Neme
- Max-Planck Institute for Evolutionary Biology, August-Thienemanstrasse 2, 24306 Plön, Germany
| | - Meike Teschke
- Max-Planck Institute for Evolutionary Biology, August-Thienemanstrasse 2, 24306 Plön, Germany
| | - Christine Pfeifle
- Max-Planck Institute for Evolutionary Biology, August-Thienemanstrasse 2, 24306 Plön, Germany
| | - Željka Pezer
- Max-Planck Institute for Evolutionary Biology, August-Thienemanstrasse 2, 24306 Plön, Germany
| | - Hiba Babiker
- Max-Planck Institute for Evolutionary Biology, August-Thienemanstrasse 2, 24306 Plön, Germany
| | - Miriam Linnenbrink
- Max-Planck Institute for Evolutionary Biology, August-Thienemanstrasse 2, 24306 Plön, Germany
| | - Inka Montero
- Max-Planck Institute for Evolutionary Biology, August-Thienemanstrasse 2, 24306 Plön, Germany
| | - Rick Scavetta
- Max-Planck Institute for Evolutionary Biology, August-Thienemanstrasse 2, 24306 Plön, Germany
| | - Mohammad Reza Abai
- Department of Medical Entomology and Vector Control, School of Public Health, Tehran University of Medical Sciences, Tehran 1417613151, Iran
| | - Marta Puente Molins
- Laboratorio de Anatomía Animal, Departamento de Biología Animal, Facultad de Ciencias, Universidad de Vigo, 36200 Vigo, Spain
| | - Mathias Schlegel
- Friedrich-Loeffler-Institut, Federal Research Institute for Animal Health, Institute for Novel and Emerging Infectious Diseases, Südufer 10, 17493 Greifswald-Insel Riems, Germany
| | - Rainer G Ulrich
- Friedrich-Loeffler-Institut, Federal Research Institute for Animal Health, Institute for Novel and Emerging Infectious Diseases, Südufer 10, 17493 Greifswald-Insel Riems, Germany
| | - Janine Altmüller
- Cologne Center for Genomics (CCG), University of Cologne, Weyertal 115b, 50931 Cologne, Germany.,Institute of Human Genetics, Universitätsklinik Köln, Kerpener Str. 34, 50931 Köln, Germany
| | - Marek Franitza
- Cologne Center for Genomics (CCG), University of Cologne, Weyertal 115b, 50931 Cologne, Germany.,Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Joseph-Stelzmann-Str. 26, 50931 Cologne, Germany
| | - Anna Büntge
- Max-Planck Institute for Evolutionary Biology, August-Thienemanstrasse 2, 24306 Plön, Germany
| | - Sven Künzel
- Max-Planck Institute for Evolutionary Biology, August-Thienemanstrasse 2, 24306 Plön, Germany
| | - Diethard Tautz
- Max-Planck Institute for Evolutionary Biology, August-Thienemanstrasse 2, 24306 Plön, Germany
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Neme R, Tautz D. Fast turnover of genome transcription across evolutionary time exposes entire non-coding DNA to de novo gene emergence. eLife 2016; 5:e09977. [PMID: 26836309 PMCID: PMC4829534 DOI: 10.7554/elife.09977] [Citation(s) in RCA: 90] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2015] [Accepted: 02/01/2016] [Indexed: 01/17/2023] Open
Abstract
Deep sequencing analyses have shown that a large fraction of genomes is transcribed, but the significance of this transcription is much debated. Here, we characterize the phylogenetic turnover of poly-adenylated transcripts in a comprehensive sampling of taxa of the mouse (genus Mus), spanning a phylogenetic distance of 10 Myr. Using deep RNA sequencing we find that at a given sequencing depth transcriptome coverage becomes saturated within a taxon, but keeps extending when compared between taxa, even at this very shallow phylogenetic level. Our data show a high turnover of transcriptional states between taxa and that no major transcript-free islands exist across evolutionary time. This suggests that the entire genome can be transcribed into poly-adenylated RNA when viewed at an evolutionary time scale. We conclude that any part of the non-coding genome can potentially become subject to evolutionary functionalization via de novo gene evolution within relatively short evolutionary time spans. DOI:http://dx.doi.org/10.7554/eLife.09977.001 Traditionally, the genome – the sum total of DNA within a cell – was thought to be divided into genes and ‘non-coding’ regions. Genes are copied, or “transcribed”, into molecules called RNA that perform essential tasks in the cell. The roles of the non-coding regions were often less clear, although it has since become apparent that some are also transcribed and generate low levels of RNA molecules. However, many debate how significant this transcription is to living organisms. Neme and Tautz have now used a technique called deep RNA sequencing to study the RNA molecules produced in several different species and types of mice whose last common ancestor lived 10 million years ago. Different species produced RNA molecules from different portions – both genes and non-coding regions – of their genomes. Comparing these RNA sequences suggests that changes to the regions that are transcribed occur relatively quickly for a large portion of the genome. Furthermore, there have been no significant areas of the common ancestor’s genome that have not been transcribed at some point in at least one of its descendent species. This therefore suggests that over a relatively short evolutionary period, any part of the genome can acquire the ability to be transcribed and potentially form a new gene. The next challenge is to find out how often these transcribed non-coding parts of the genome show important biochemical activities, and how they find their way into becoming new genes. DOI:http://dx.doi.org/10.7554/eLife.09977.002
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Affiliation(s)
- Rafik Neme
- Max-Planck Institute for Evolutionary Biology, Plön, Germany
| | - Diethard Tautz
- Max-Planck Institute for Evolutionary Biology, Plön, Germany
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Hasenkamp N, Solomon T, Tautz D. Selective sweeps versus introgression - population genetic dynamics of the murine leukemia virus receptor Xpr1 in wild populations of the house mouse (Mus musculus). BMC Evol Biol 2015; 15:248. [PMID: 26555287 PMCID: PMC4641351 DOI: 10.1186/s12862-015-0528-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2015] [Accepted: 10/30/2015] [Indexed: 12/13/2022] Open
Abstract
Background The interaction between viruses and their receptors in the host can be expected to lead to an evolutionary arms race resulting in cycles of rapid adaptations. We focus here on the receptor gene Xpr1 (xenotropic and polytropic retrovirus receptor 1) for murine leukemia viruses (MLVs). In a previous screen for selective sweeps in mouse populations we discovered that a population from Germany was almost monomorphic for Xpr1 haplotypes, while a population from France was polymorphic. Results Here we analyze Xpr1 sequences and haplotypes from a broad sample of wild mouse populations of two subspecies, M. m. domesticus and M. m. musculus, to trace the origins of this distinctive polymorphism pattern. We show that the high polymorphism in the population in France is caused by a relatively recent invasion of a haplotype from a population in Iran, rather than a selective sweep in Germany. The invading haplotype codes for a novel receptor variant, which has itself undergone a recent selective sweep in the Iranian population. Conclusions Our data support a scenario in which Xpr1 is frequently subject to positive selection, possibly as a response to resistance development against recurrently emerging infectious viruses. During such an infection cycle, receptor variants that may convey viral resistance can be captured from another population and quickly introgress into populations actively dealing with the infectious virus. Electronic supplementary material The online version of this article (doi:10.1186/s12862-015-0528-5) contains supplementary material, which is available to authorized users.
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Affiliation(s)
| | - Terry Solomon
- Max-Planck Institute for Evolutionary Biology, 24306, Plön, Germany. .,Biomedical Sciences Graduate Program, School of Medicine, University of California San Diego, La Jolla, CA, USA.
| | - Diethard Tautz
- Max-Planck Institute for Evolutionary Biology, 24306, Plön, Germany.
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Pezer Ž, Harr B, Teschke M, Babiker H, Tautz D. Divergence patterns of genic copy number variation in natural populations of the house mouse (Mus musculus domesticus) reveal three conserved genes with major population-specific expansions. Genome Res 2015; 25:1114-24. [PMID: 26149421 PMCID: PMC4509996 DOI: 10.1101/gr.187187.114] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2014] [Accepted: 06/05/2015] [Indexed: 11/29/2022]
Abstract
Copy number variation represents a major source of genetic divergence, yet the evolutionary dynamics of genic copy number variation in natural populations during differentiation and adaptation remain unclear. We applied a read depth approach to genome resequencing data to detect copy number variants (CNVs) ≥1 kb in wild-caught mice belonging to four populations of Mus musculus domesticus. We complemented the bioinformatics analyses with experimental validation using droplet digital PCR. The specific focus of our analysis is CNVs that include complete genes, as these CNVs could be expected to contribute most directly to evolutionary divergence. In total, 1863 transcription units appear to be completely encompassed within CNVs in at least one individual when compared to the reference assembly. Further, 179 of these CNVs show population-specific copy number differences, and 325 are subject to complete deletion in multiple individuals. Among the most copy-number variable genes are three highly conserved genes that encode the splicing factor CWC22, the spindle protein SFI1, and the Holliday junction recognition protein HJURP. These genes exhibit population-specific expansion patterns that suggest involvement in local adaptations. We found that genes that overlap with large segmental duplications are generally more copy-number variable. These genes encode proteins that are relevant for environmental and behavioral interactions, such as vomeronasal and olfactory receptors, as well as major urinary proteins and several proteins of unknown function. The overall analysis shows that genic CNVs contribute more to population differentiation in mice than in humans and may promote and speed up population divergence.
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Affiliation(s)
- Željka Pezer
- Max Planck Institute for Evolutionary Biology, 24306 Plön, Germany
| | - Bettina Harr
- Max Planck Institute for Evolutionary Biology, 24306 Plön, Germany
| | - Meike Teschke
- Max Planck Institute for Evolutionary Biology, 24306 Plön, Germany
| | - Hiba Babiker
- Max Planck Institute for Evolutionary Biology, 24306 Plön, Germany
| | - Diethard Tautz
- Max Planck Institute for Evolutionary Biology, 24306 Plön, Germany
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38
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Phifer-Rixey M, Nachman MW. Insights into mammalian biology from the wild house mouse Mus musculus. eLife 2015; 4. [PMID: 25875302 PMCID: PMC4397906 DOI: 10.7554/elife.05959] [Citation(s) in RCA: 101] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2014] [Accepted: 03/26/2015] [Indexed: 12/22/2022] Open
Abstract
The house mouse, Mus musculus, was established in the early 1900s as one of the first genetic model organisms owing to its short generation time, comparatively large litters, ease of husbandry, and visible phenotypic variants. For these reasons and because they are mammals, house mice are well suited to serve as models for human phenotypes and disease. House mice in the wild consist of at least three distinct subspecies and harbor extensive genetic and phenotypic variation both within and between these subspecies. Wild mice have been used to study a wide range of biological processes, including immunity, cancer, male sterility, adaptive evolution, and non-Mendelian inheritance. Despite the extensive variation that exists among wild mice, classical laboratory strains are derived from a limited set of founders and thus contain only a small subset of this variation. Continued efforts to study wild house mice and to create new inbred strains from wild populations have the potential to strengthen house mice as a model system. DOI:http://dx.doi.org/10.7554/eLife.05959.001
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Affiliation(s)
- Megan Phifer-Rixey
- Department of Integrative Biology, University of California, Berkeley, Berkeley, United States and Museum of Vertebrate Zoology, University of California, Berkeley, Berkeley, United States
| | - Michael W Nachman
- Department of Integrative Biology, University of California, Berkeley, Berkeley, United States and Museum of Vertebrate Zoology, University of California, Berkeley, Berkeley, United States
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