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Foster Y, Dutoit L, Grosser S, Dussex N, Foster BJ, Dodds KG, Brauning R, Van Stijn T, Robertson F, McEwan JC, Jacobs JME, Robertson BC. Genomic signatures of inbreeding in a critically endangered parrot, the kākāpō. G3 (Bethesda) 2021; 11:jkab307. [PMID: 34542587 PMCID: PMC8527487 DOI: 10.1093/g3journal/jkab307] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Accepted: 08/23/2021] [Indexed: 02/06/2023]
Abstract
Events of inbreeding are inevitable in critically endangered species. Reduced population sizes and unique life-history traits can increase the severity of inbreeding, leading to declines in fitness and increased risk of extinction. Here, we investigate levels of inbreeding in a critically endangered flightless parrot, the kākāpō (Strigops habroptilus), wherein a highly inbred island population and one individual from the mainland of New Zealand founded the entire extant population. Genotyping-by-sequencing (GBS), and a genotype calling approach using a chromosome-level genome assembly, identified a filtered set of 12,241 single-nucleotide polymorphisms (SNPs) among 161 kākāpō, which together encompass the total genetic potential of the extant population. Multiple molecular-based estimates of inbreeding were compared, including genome-wide estimates of heterozygosity (FH), the diagonal elements of a genomic-relatedness matrix (FGRM), and runs of homozygosity (RoH, FRoH). In addition, we compared levels of inbreeding in chicks from a recent breeding season to examine if inbreeding is associated with offspring survival. The density of SNPs generated with GBS was sufficient to identify chromosomes that were largely homozygous with RoH distributed in similar patterns to other inbred species. Measures of inbreeding were largely correlated and differed significantly between descendants of the two founding populations. However, neither inbreeding nor ancestry was found to be associated with reduced survivorship in chicks, owing to unexpected mortality in chicks exhibiting low levels of inbreeding. Our study highlights important considerations for estimating inbreeding in critically endangered species, such as the impacts of small population sizes and admixture between diverse lineages.
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Affiliation(s)
- Yasmin Foster
- Department of Zoology, University of Otago, Dunedin 9054, New Zealand
| | - Ludovic Dutoit
- Department of Zoology, University of Otago, Dunedin 9054, New Zealand
| | - Stefanie Grosser
- Department of Zoology, University of Otago, Dunedin 9054, New Zealand
| | - Nicolas Dussex
- Centre for Palaeogenetics, SE-106 91 Stockholm, Sweden
- Department of Bioinformatics and Genetics, Swedish Museum of Natural History, SE-104 05 Stockholm, Sweden
- Department of Zoology, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Brodie J Foster
- Department of Zoology, University of Otago, Dunedin 9054, New Zealand
| | - Ken G Dodds
- AgResearch Invermay Agricultural Centre, Mosgiel 9053, New Zealand
| | - Rudiger Brauning
- AgResearch Invermay Agricultural Centre, Mosgiel 9053, New Zealand
| | - Tracey Van Stijn
- AgResearch Invermay Agricultural Centre, Mosgiel 9053, New Zealand
| | - Fiona Robertson
- Department of Zoology, University of Otago, Dunedin 9054, New Zealand
| | - John C McEwan
- AgResearch Invermay Agricultural Centre, Mosgiel 9053, New Zealand
| | | | - Bruce C Robertson
- Department of Zoology, University of Otago, Dunedin 9054, New Zealand
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Gemmell NJ, Rutherford K, Prost S, Tollis M, Winter D, Macey JR, Adelson DL, Suh A, Bertozzi T, Grau JH, Organ C, Gardner PP, Muffato M, Patricio M, Billis K, Martin FJ, Flicek P, Petersen B, Kang L, Michalak P, Buckley TR, Wilson M, Cheng Y, Miller H, Schott RK, Jordan MD, Newcomb RD, Arroyo JI, Valenzuela N, Hore TA, Renart J, Peona V, Peart CR, Warmuth VM, Zeng L, Kortschak RD, Raison JM, Zapata VV, Wu Z, Santesmasses D, Mariotti M, Guigó R, Rupp SM, Twort VG, Dussex N, Taylor H, Abe H, Bond DM, Paterson JM, Mulcahy DG, Gonzalez VL, Barbieri CG, DeMeo DP, Pabinger S, Van Stijn T, Clarke S, Ryder O, Edwards SV, Salzberg SL, Anderson L, Nelson N, Stone C. The tuatara genome reveals ancient features of amniote evolution. Nature 2020; 584:403-409. [PMID: 32760000 PMCID: PMC7116210 DOI: 10.1038/s41586-020-2561-9] [Citation(s) in RCA: 73] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2019] [Accepted: 06/26/2020] [Indexed: 12/21/2022]
Abstract
The tuatara (Sphenodon punctatus)-the only living member of the reptilian order Rhynchocephalia (Sphenodontia), once widespread across Gondwana1,2-is an iconic species that is endemic to New Zealand2,3. A key link to the now-extinct stem reptiles (from which dinosaurs, modern reptiles, birds and mammals evolved), the tuatara provides key insights into the ancestral amniotes2,4. Here we analyse the genome of the tuatara, which-at approximately 5 Gb-is among the largest of the vertebrate genomes yet assembled. Our analyses of this genome, along with comparisons with other vertebrate genomes, reinforce the uniqueness of the tuatara. Phylogenetic analyses indicate that the tuatara lineage diverged from that of snakes and lizards around 250 million years ago. This lineage also shows moderate rates of molecular evolution, with instances of punctuated evolution. Our genome sequence analysis identifies expansions of proteins, non-protein-coding RNA families and repeat elements, the latter of which show an amalgam of reptilian and mammalian features. The sequencing of the tuatara genome provides a valuable resource for deep comparative analyses of tetrapods, as well as for tuatara biology and conservation. Our study also provides important insights into both the technical challenges and the cultural obligations that are associated with genome sequencing.
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Affiliation(s)
- Neil J Gemmell
- Department of Anatomy, University of Otago, Dunedin, New Zealand.
| | - Kim Rutherford
- Department of Anatomy, University of Otago, Dunedin, New Zealand
| | - Stefan Prost
- LOEWE-Center for Translational Biodiversity Genomics, Senckenberg Museum, Frankfurt, Germany
- South African National Biodiversity Institute, National Zoological Garden, Pretoria, South Africa
| | - Marc Tollis
- School of Life Sciences, Arizona State University, Tempe, AZ, USA
- School of Informatics, Computing, and Cyber Systems, Northern Arizona University, Flagstaff, AZ, USA
| | - David Winter
- School of Fundamental Sciences, Massey University, Palmerston North, New Zealand
| | | | - David L Adelson
- School of Biological Sciences, The University of Adelaide, Adelaide, South Australia, Australia
| | - Alexander Suh
- Department of Ecology and Genetics - Evolutionary Biology, Evolutionary Biology Centre (EBC), Uppsala University, Uppsala, Sweden
- Department of Organismal Biology - Systematic Biology, Evolutionary Biology Centre (EBC), Uppsala University, Uppsala, Sweden
| | - Terry Bertozzi
- School of Biological Sciences, The University of Adelaide, Adelaide, South Australia, Australia
- Evolutionary Biology Unit, South Australian Museum, Adelaide, South Australia, Australia
| | - José H Grau
- Amedes Genetics, Amedes Medizinische Dienstleistungen, Berlin, Germany
- Museum für Naturkunde Berlin, Leibniz-Institut für Evolutions- und Biodiversitätsforschung an der Humboldt-Universität zu Berlin, Berlin, Germany
| | - Chris Organ
- Department of Earth Sciences, Montana State University, Bozeman, MT, USA
| | - Paul P Gardner
- Department of Biochemistry, University of Otago, Dunedin, New Zealand
| | - Matthieu Muffato
- European Molecular Biology Laboratory, European Bioinformatics Institute, Hinxton, UK
| | - Mateus Patricio
- European Molecular Biology Laboratory, European Bioinformatics Institute, Hinxton, UK
| | - Konstantinos Billis
- European Molecular Biology Laboratory, European Bioinformatics Institute, Hinxton, UK
| | - Fergal J Martin
- European Molecular Biology Laboratory, European Bioinformatics Institute, Hinxton, UK
| | - Paul Flicek
- European Molecular Biology Laboratory, European Bioinformatics Institute, Hinxton, UK
| | - Bent Petersen
- Section for Evolutionary Genomics, The GLOBE Institute, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Lin Kang
- Edward Via College of Osteopathic Medicine, Blacksburg, VA, USA
| | - Pawel Michalak
- Edward Via College of Osteopathic Medicine, Blacksburg, VA, USA
- Center for One Health Research, Virginia-Maryland College of Veterinary Medicine, Blacksburg, VA, USA
- Institute of Evolution, University of Haifa, Haifa, Israel
| | - Thomas R Buckley
- Manaaki Whenua - Landcare Research, Auckland, New Zealand
- School of Biological Sciences, The University of Auckland, Auckland, New Zealand
| | - Melissa Wilson
- School of Life Sciences, Arizona State University, Tempe, AZ, USA
| | - Yuanyuan Cheng
- School of Life and Environmental Sciences, The University of Sydney, Sydney, New South Wales, Australia
| | | | - Ryan K Schott
- Department of Vertebrate Zoology, National Museum of Natural History, Smithsonian Institution, Washington, DC, USA
| | - Melissa D Jordan
- The New Zealand Institute for Plant and Food Research, Auckland, New Zealand
| | - Richard D Newcomb
- The New Zealand Institute for Plant and Food Research, Auckland, New Zealand
| | - José Ignacio Arroyo
- Departamento de Ecología, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Nicole Valenzuela
- Department of Ecology, Evolution, and Organismal Biology, Iowa State University, Ames, IA, USA
| | - Tim A Hore
- Department of Anatomy, University of Otago, Dunedin, New Zealand
| | - Jaime Renart
- Instituto de Investigaciones Biomédicas 'Alberto Sols' CSIC-UAM, Madrid, Spain
| | - Valentina Peona
- Department of Ecology and Genetics - Evolutionary Biology, Evolutionary Biology Centre (EBC), Uppsala University, Uppsala, Sweden
- Department of Organismal Biology - Systematic Biology, Evolutionary Biology Centre (EBC), Uppsala University, Uppsala, Sweden
| | - Claire R Peart
- Department of Ecology and Genetics - Evolutionary Biology, Evolutionary Biology Centre (EBC), Uppsala University, Uppsala, Sweden
- Division of Evolutionary Biology, Faculty of Biology, Ludwig-Maximilian University of Munich, Planegg-Martinsried, Germany
| | - Vera M Warmuth
- Department of Ecology and Genetics - Evolutionary Biology, Evolutionary Biology Centre (EBC), Uppsala University, Uppsala, Sweden
- Division of Evolutionary Biology, Faculty of Biology, Ludwig-Maximilian University of Munich, Planegg-Martinsried, Germany
| | - Lu Zeng
- School of Biological Sciences, The University of Adelaide, Adelaide, South Australia, Australia
| | - R Daniel Kortschak
- School of Biological Sciences, The University of Adelaide, Adelaide, South Australia, Australia
| | - Joy M Raison
- School of Biological Sciences, The University of Adelaide, Adelaide, South Australia, Australia
| | | | - Zhiqiang Wu
- Department of Ecology, Evolution, and Organismal Biology, Iowa State University, Ames, IA, USA
| | - Didac Santesmasses
- Centre for Genomic Regulation (CRG), The Barcelona Institute for Science and Technology, Universitat Pompeu Fabra (UPF), Barcelona, Spain
| | - Marco Mariotti
- Centre for Genomic Regulation (CRG), The Barcelona Institute for Science and Technology, Universitat Pompeu Fabra (UPF), Barcelona, Spain
| | - Roderic Guigó
- Centre for Genomic Regulation (CRG), The Barcelona Institute for Science and Technology, Universitat Pompeu Fabra (UPF), Barcelona, Spain
| | - Shawn M Rupp
- School of Life Sciences, Arizona State University, Tempe, AZ, USA
| | - Victoria G Twort
- Manaaki Whenua - Landcare Research, Auckland, New Zealand
- School of Biological Sciences, The University of Auckland, Auckland, New Zealand
| | - Nicolas Dussex
- Department of Anatomy, University of Otago, Dunedin, New Zealand
| | - Helen Taylor
- Department of Anatomy, University of Otago, Dunedin, New Zealand
| | - Hideaki Abe
- Department of Anatomy, University of Otago, Dunedin, New Zealand
| | - Donna M Bond
- Department of Anatomy, University of Otago, Dunedin, New Zealand
| | - James M Paterson
- School of Biological Sciences, University of Canterbury, Christchurch, New Zealand
| | - Daniel G Mulcahy
- Global Genome Initiative, National Museum of Natural History, Smithsonian Institution, Washington, DC, USA
| | - Vanessa L Gonzalez
- Global Genome Initiative, National Museum of Natural History, Smithsonian Institution, Washington, DC, USA
| | | | | | - Stephan Pabinger
- Austrian Institute of Technology (AIT), Center for Health and Bioresources, Molecular Diagnostics, Vienna, Austria
| | | | - Shannon Clarke
- AgResearch, Invermay Agricultural Centre, Mosgiel, New Zealand
| | - Oliver Ryder
- San Diego Zoo Institute for Conservation Research, Escondido, CA, USA
| | - Scott V Edwards
- Department of Organismic and Evolutionary Biology and the Museum of Comparative Zoology, Harvard University, Cambridge, MA, USA
| | - Steven L Salzberg
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD, USA
| | - Lindsay Anderson
- School of Biological Sciences, Victoria University of Wellington, Wellington, New Zealand
| | - Nicola Nelson
- School of Biological Sciences, Victoria University of Wellington, Wellington, New Zealand
| | - Clive Stone
- Ngatiwai Trust Board, Whangarei, New Zealand
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