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Kleinau G, Chini B, Andersson L, Scheerer P. The role of G protein-coupled receptors and their ligands in animal domestication. Anim Genet 2024. [PMID: 39324206 DOI: 10.1111/age.13476] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2024] [Revised: 09/11/2024] [Accepted: 09/11/2024] [Indexed: 09/27/2024]
Abstract
The domestication of plants and animals has resulted in one of the most significant cultural and socio-economical transitions in human history. Domestication of animals, including human-supervised reproduction, largely uncoupled particular animal species from their natural, evolutionary history driven by environmental and ecological factors. The primary motivations for domesticating animals were, and still are, producing food and materials (e.g. meat, eggs, honey or milk products, wool, leather products, jewelry and medication products) to support plowing in agriculture or in transportation (e.g. horse, cattle, camel and llama) and to facilitate human activities (for hunting, rescuing, therapeutic aid, guarding behavior and protecting or just as a companion). In recent years, decoded genetic information from more than 40 domesticated animal species have become available; these studies have identified genes and mutations associated with specific physiological and behavioral traits contributing to the complex genetic background of animal domestication. These breeding-altered genomes provide insights into the regulation of different physiological areas, including information on links between e.g. endocrinology and behavior, with important pathophysiological implications (e.g. for obesity and cancer), extending the interest in domestication well beyond the field. Several genes that have undergone selection during domestication and breeding encode specific G protein-coupled receptors, a class of membrane-spanning receptors involved in the regulation of a number of overarching functions such as reproduction, development, body homeostasis, metabolism, stress responses, cognition, learning and memory. Here we summarize the available literature on variations in G protein-coupled receptors and their ligands and how these have contributed to animal domestication.
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Affiliation(s)
- Gunnar Kleinau
- Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Institute of Medical Physics and Biophysics, Group Structural Biology of Cellular Signaling, Berlin, Germany
| | - Bice Chini
- CNR, Institute of Neuroscience, Vedano al Lambro, Italy, and NeuroMI - Milan Center for Neuroscience, University of Milano-Bicocca, Milan, Italy
| | - Leif Andersson
- Department of Medical Biochemistry and Microbiology, Uppsala University, Uppsala, Sweden
- Department of Veterinary Integrative Biosciences, Texas A&M University, College Station, Texas, USA
| | - Patrick Scheerer
- Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Institute of Medical Physics and Biophysics, Group Structural Biology of Cellular Signaling, Berlin, Germany
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2
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Chen C, Li J, Li Z, Nong Y, Wang J, Wang Z, Li Z. Whole-genome resequencing reveals melanin deposition candidate genes of Luning chicken. BMC Genomics 2024; 25:858. [PMID: 39271972 PMCID: PMC11401408 DOI: 10.1186/s12864-024-10774-5] [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: 01/09/2024] [Accepted: 09/04/2024] [Indexed: 09/15/2024] Open
Abstract
BACKGROUND Melanin in the black-bone chicken's body is considered the material basis for its medicinal effects and is an economically important trait. Therefore, improving the melanin content is a crucial focus in the breeding process of black-bone chickens. Luning chickens are black-bone chickens, with black beaks, skin, and meat. To investigate the genetic diversity and molecular mechanisms of melanin deposition in Luning chickens, we conducted whole-genome resequencing to analyze their breeding history and identify candidate genes influencing their black phenotype, along with transcriptome sequencing of dorsal skin tissues of male Luning chickens. RESULTS Population structure analysis revealed that Luning chickens tend to cluster independently and are closely related to Tibetan chickens. Runs of homozygosity analysis suggested potential inbreeding in the Luning chicken and Tibetan chicken population. By combining genetic differentiation index (Fst) and nucleotide diversity (θπ) ratios, we pinpointed selected regions associated with melanin deposition. Gene annotation identified 540 genes with the highest Fst value in LOC101750371 and LOC121108313, located on the 68.24-68.58 Mb interval of chromosome Z. Combining genomic and transcriptomic data, we identified ATP5E, EDN3, and LOC101750371 as candidate genes influencing skin color traits in black-bone chickens. CONCLUSIONS This study characterized the evolutionary history of Luning chickens and preliminarily excavated candidate genes influencing the genetic mechanism of pigmentation in black-bone chickens, providing valuable insights for the study of animal melanin deposition.
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Affiliation(s)
- Chuwen Chen
- Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization (Southwest Minzu University), Ministry of Education, Chengdu, China
- Key Laboratory of Animal Science of National Ethnic Affairs Commission of China, Southwest Minzu University, Chengdu, China
- College of Animal & Veterinary Sciences, Southwest Minzu University, Chengdu, China
| | - Jie Li
- Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization (Southwest Minzu University), Ministry of Education, Chengdu, China
- Key Laboratory of Animal Science of National Ethnic Affairs Commission of China, Southwest Minzu University, Chengdu, China
- College of Animal & Veterinary Sciences, Southwest Minzu University, Chengdu, China
| | - Zhiyi Li
- Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization (Southwest Minzu University), Ministry of Education, Chengdu, China
- Key Laboratory of Animal Science of National Ethnic Affairs Commission of China, Southwest Minzu University, Chengdu, China
- College of Animal & Veterinary Sciences, Southwest Minzu University, Chengdu, China
| | - Yi Nong
- Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization (Southwest Minzu University), Ministry of Education, Chengdu, China
- Key Laboratory of Animal Science of National Ethnic Affairs Commission of China, Southwest Minzu University, Chengdu, China
- College of Animal & Veterinary Sciences, Southwest Minzu University, Chengdu, China
| | - Jiayan Wang
- Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization (Southwest Minzu University), Ministry of Education, Chengdu, China
- Key Laboratory of Animal Science of National Ethnic Affairs Commission of China, Southwest Minzu University, Chengdu, China
- College of Animal & Veterinary Sciences, Southwest Minzu University, Chengdu, China
| | - Zi Wang
- Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization (Southwest Minzu University), Ministry of Education, Chengdu, China
- Key Laboratory of Animal Science of National Ethnic Affairs Commission of China, Southwest Minzu University, Chengdu, China
- College of Animal & Veterinary Sciences, Southwest Minzu University, Chengdu, China
| | - Zhixiong Li
- Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization (Southwest Minzu University), Ministry of Education, Chengdu, China.
- Key Laboratory of Animal Science of National Ethnic Affairs Commission of China, Southwest Minzu University, Chengdu, China.
- College of Animal & Veterinary Sciences, Southwest Minzu University, Chengdu, China.
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3
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Andrade P, Alves JM, Pereira P, Rubin CJ, Silva E, Sprehn CG, Enbody E, Afonso S, Faria R, Zhang Y, Bonino N, Duckworth JA, Garreau H, Letnic M, Strive T, Thulin CG, Queney G, Villafuerte R, Jiggins FM, Ferrand N, Andersson L, Carneiro M. Selection against domestication alleles in introduced rabbit populations. Nat Ecol Evol 2024; 8:1543-1555. [PMID: 38907020 DOI: 10.1038/s41559-024-02443-3] [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: 10/16/2023] [Accepted: 05/14/2024] [Indexed: 06/23/2024]
Abstract
Humans have moved domestic animals around the globe for thousands of years. These have occasionally established feral populations in nature, often with devastating ecological consequences. To understand how natural selection shapes re-adaptation into the wild, we investigated one of the most successful colonizers in history, the European rabbit. By sequencing the genomes of 297 rabbits across three continents, we show that introduced populations exhibit a mixed wild-domestic ancestry. We show that alleles that increased in frequency during domestication were preferentially selected against in novel natural environments. Interestingly, causative mutations for common domestication traits sometimes segregate at considerable frequencies if associated with less drastic phenotypes (for example, coat colour dilution), whereas mutations that are probably strongly maladaptive in nature are absent. Whereas natural selection largely targeted different genomic regions in each introduced population, some of the strongest signals of parallelism overlap genes associated with neuronal or brain function. This limited parallelism is probably explained by extensive standing genetic variation resulting from domestication together with the complex mixed ancestry of introduced populations. Our findings shed light on the selective and molecular mechanisms that enable domestic animals to re-adapt to the wild and provide important insights for the mitigation and management of invasive populations.
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Affiliation(s)
- Pedro Andrade
- CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, InBIO Laboratório Associado, Campus de Vairão, Universidade do Porto, Vairão, Portugal.
- BIOPOLIS Program in Genomics, Biodiversity and Land Planning, CIBIO, Campus de Vairão, Vairão, Portugal.
| | - Joel M Alves
- CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, InBIO Laboratório Associado, Campus de Vairão, Universidade do Porto, Vairão, Portugal
- BIOPOLIS Program in Genomics, Biodiversity and Land Planning, CIBIO, Campus de Vairão, Vairão, Portugal
- Palaeogenomics and Bio-Archaeology Research Network Research Laboratory for Archaeology and History of Art, University of Oxford, Oxford, UK
| | - Paulo Pereira
- CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, InBIO Laboratório Associado, Campus de Vairão, Universidade do Porto, Vairão, Portugal
- BIOPOLIS Program in Genomics, Biodiversity and Land Planning, CIBIO, Campus de Vairão, Vairão, Portugal
- Departamento de Biologia, Faculdade de Ciências, Universidade do Porto, Porto, Portugal
| | - Carl-Johan Rubin
- Department of Medical Biochemistry and Microbiology, Uppsala University, Uppsala, Sweden
- Institute of Marine Research, Bergen, Norway
| | - Eugénio Silva
- CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, InBIO Laboratório Associado, Campus de Vairão, Universidade do Porto, Vairão, Portugal
- BIOPOLIS Program in Genomics, Biodiversity and Land Planning, CIBIO, Campus de Vairão, Vairão, Portugal
- Departamento de Biologia, Faculdade de Ciências, Universidade do Porto, Porto, Portugal
| | - C Grace Sprehn
- Department of Medical Biochemistry and Microbiology, Uppsala University, Uppsala, Sweden
| | - Erik Enbody
- Department of Medical Biochemistry and Microbiology, Uppsala University, Uppsala, Sweden
- Department of Biomolecular Engineering, University of California, Santa Cruz, CA, USA
| | - Sandra Afonso
- CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, InBIO Laboratório Associado, Campus de Vairão, Universidade do Porto, Vairão, Portugal
- BIOPOLIS Program in Genomics, Biodiversity and Land Planning, CIBIO, Campus de Vairão, Vairão, Portugal
| | - Rui Faria
- CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, InBIO Laboratório Associado, Campus de Vairão, Universidade do Porto, Vairão, Portugal
- BIOPOLIS Program in Genomics, Biodiversity and Land Planning, CIBIO, Campus de Vairão, Vairão, Portugal
| | - Yexin Zhang
- Department of Genetics, University of Cambridge, Cambridge, UK
| | - Never Bonino
- Estación Experimental Bariloche, Instituto Nacional de Tecnología Agropecuaria, Casilla de Correo Bariloche, Argentina
| | - Janine A Duckworth
- Wildlife Ecology and Management Group, Manaaki Whenua - Landcare Research, Lincoln, New Zealand
- Invasive Animals Cooperative Research Centre, University of Canberra, Bruce, Australian Capital Territory, Australia
| | - Hervé Garreau
- GenPhySE, Université de Toulouse, Castanet-Tolosan, France
| | - Mike Letnic
- Centre for Ecosystem Science, School of BEES, University of New South Wales, Sydney, New South Wales, Australia
- Evolution and Ecology Research Centre, School of BEES, University of New South Wales, Sydney, New South Wales, Australia
| | - Tanja Strive
- Centre for Invasive Species Solutions, University of Canberra, Bruce, Australian Capital Territory, Australia
- Commonwealth Scientific and Industrial Research Organisation, Canberra, Australian Capital Territory, Australia
| | - Carl-Gustaf Thulin
- Department of Animal Biosciences, Swedish University of Agricultural Sciences, Uppsala, Sweden
| | - Guillaume Queney
- ANTAGENE, Wildlife Genetics Laboratory, La Tour de Salvagny, France
| | | | | | - Nuno Ferrand
- CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, InBIO Laboratório Associado, Campus de Vairão, Universidade do Porto, Vairão, Portugal
- BIOPOLIS Program in Genomics, Biodiversity and Land Planning, CIBIO, Campus de Vairão, Vairão, Portugal
- Departamento de Biologia, Faculdade de Ciências, Universidade do Porto, Porto, Portugal
- Department of Zoology, Faculty of Sciences, University of Johannesburg, Auckland Park, South Africa
| | - Leif Andersson
- Department of Medical Biochemistry and Microbiology, Uppsala University, Uppsala, Sweden.
- Department of Veterinary Integrative Biosciences, Texas A&M University, College Station, TX, USA.
| | - Miguel Carneiro
- CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, InBIO Laboratório Associado, Campus de Vairão, Universidade do Porto, Vairão, Portugal.
- BIOPOLIS Program in Genomics, Biodiversity and Land Planning, CIBIO, Campus de Vairão, Vairão, Portugal.
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De Meester L, Vázquez-Domínguez E, Kassen R, Forest F, Bellon MR, Koskella B, Scherson RA, Colli L, Hendry AP, Crandall KA, Faith DP, Starger CJ, Geeta R, Araki H, Dulloo EM, Souffreau C, Schroer S, Johnson MTJ. A link between evolution and society fostering the UN sustainable development goals. Evol Appl 2024; 17:e13728. [PMID: 38884021 PMCID: PMC11178947 DOI: 10.1111/eva.13728] [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: 03/28/2023] [Revised: 05/16/2024] [Accepted: 05/17/2024] [Indexed: 06/18/2024] Open
Abstract
Given the multitude of challenges Earth is facing, sustainability science is of key importance to our continued existence. Evolution is the fundamental biological process underlying the origin of all biodiversity. This phylogenetic diversity fosters the resilience of ecosystems to environmental change, and provides numerous resources to society, and options for the future. Genetic diversity within species is also key to the ability of populations to evolve and adapt to environmental change. Yet, the value of evolutionary processes and the consequences of their impairment have not generally been considered in sustainability research. We argue that biological evolution is important for sustainability and that the concepts, theory, data, and methodological approaches used in evolutionary biology can, in crucial ways, contribute to achieving the UN Sustainable Development Goals (SDGs). We discuss how evolutionary principles are relevant to understanding, maintaining, and improving Nature Contributions to People (NCP) and how they contribute to the SDGs. We highlight specific applications of evolution, evolutionary theory, and evolutionary biology's diverse toolbox, grouped into four major routes through which evolution and evolutionary insights can impact sustainability. We argue that information on both within-species evolutionary potential and among-species phylogenetic diversity is necessary to predict population, community, and ecosystem responses to global change and to make informed decisions on sustainable production, health, and well-being. We provide examples of how evolutionary insights and the tools developed by evolutionary biology can not only inspire and enhance progress on the trajectory to sustainability, but also highlight some obstacles that hitherto seem to have impeded an efficient uptake of evolutionary insights in sustainability research and actions to sustain SDGs. We call for enhanced collaboration between sustainability science and evolutionary biology to understand how integrating these disciplines can help achieve the sustainable future envisioned by the UN SDGs.
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Affiliation(s)
- Luc De Meester
- Leibniz Institute of Freshwater Ecology and Inland Fisheries (IGB) Berlin Germany
- Laboratory of Aquatic Ecology, Evolution and Conservation KU Leuven Leuven Belgium
- Institute of Biology Freie University Berlin Berlin Germany
- Berlin-Brandenburg Institute of Advanced Biodiversity Research (BBIB) Berlin Germany
| | - Ella Vázquez-Domínguez
- Departamento de Ecología de la Biodiversidad, Instituto de Ecología, Universidad Nacional Autónoma de México Ciudad Universitaria Ciudad de México Mexico
- Conservation and Evolutionary Genetics Group Estación Biológica de Doñana (EBD-CSIC) Sevilla Spain
| | - Rees Kassen
- Department of Biology McGill University Montreal Quebec Canada
| | | | - Mauricio R Bellon
- Comisión Nacional Para el Conocimiento y Uso de la Biodiversidad (CONABIO) México City Mexico
- Swette Center for Sustainable Food Systems Arizona State University Tempe Arizona USA
| | - Britt Koskella
- Department of Integrative Biology University of California Berkeley California USA
| | - Rosa A Scherson
- Laboratorio Evolución y Sistemática, Departamento de Silvicultura y Conservación de la Naturaleza Universidad de Chile Santiago Chile
| | - Licia Colli
- Dipartimento di Scienze Animali, Della Nutrizione e Degli Alimenti, BioDNA Centro di Ricerca Sulla Biodiversità e Sul DNA Antico, Facoltà di Scienze Agrarie, Alimentari e Ambientali Università Cattolica del Sacro Cuore Piacenza Italy
| | - Andrew P Hendry
- Redpath Museum & Department of Biology McGill University Montreal Quebec Canada
| | - Keith A Crandall
- Department of Biostatistics and Bioinformatics George Washington University Washington DC USA
- Department of Invertebrate Zoology, US National Museum of Natural History Smithsonian Institution Washington DC USA
| | | | - Craig J Starger
- School of Global Environmental Sustainability Colorado State University Fort Collins Colorado USA
| | - R Geeta
- Department of Botany University of Delhi New Delhi India
| | - Hitoshi Araki
- Research Faculty of Agriculture Hokkaido University Sapporo Japan
| | - Ehsan M Dulloo
- Effective Genetic Resources Conservation and Use Alliance of Bioversity International and CIAT Rome Italy
| | - Caroline Souffreau
- Laboratory of Aquatic Ecology, Evolution and Conservation KU Leuven Leuven Belgium
| | - Sibylle Schroer
- Leibniz Institute of Freshwater Ecology and Inland Fisheries (IGB) Berlin Germany
| | - Marc T J Johnson
- Department of Biology & Centre for Urban Environments University of Toronto Mississauga Mississauga Ontario Canada
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5
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Alam O, Purugganan MD. Domestication and the evolution of crops: variable syndromes, complex genetic architectures, and ecological entanglements. THE PLANT CELL 2024; 36:1227-1241. [PMID: 38243576 PMCID: PMC11062453 DOI: 10.1093/plcell/koae013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Revised: 12/01/2023] [Accepted: 12/14/2023] [Indexed: 01/21/2024]
Abstract
Domestication can be considered a specialized mutualism in which a domesticator exerts control over the reproduction or propagation (fitness) of a domesticated species to gain resources or services. The evolution of crops by human-associated selection provides a powerful set of models to study recent evolutionary adaptations and their genetic bases. Moreover, the domestication and dispersal of crops such as rice, maize, and wheat during the Holocene transformed human social and political organization by serving as the key mechanism by which human societies fed themselves. Here we review major themes and identify emerging questions in three fundamental areas of crop domestication research: domestication phenotypes and syndromes, genetic architecture underlying crop evolution, and the ecology of domestication. Current insights on the domestication syndrome in crops largely come from research on cereal crops such as rice and maize, and recent work indicates distinct domestication phenotypes can arise from different domestication histories. While early studies on the genetics of domestication often identified single large-effect loci underlying major domestication traits, emerging evidence supports polygenic bases for many canonical traits such as shattering and plant architecture. Adaptation in human-constructed environments also influenced ecological traits in domesticates such as resource acquisition rates and interactions with other organisms such as root mycorrhizal fungi and pollinators. Understanding the ecological context of domestication will be key to developing resource-efficient crops and implementing more sustainable land management and cultivation practices.
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Affiliation(s)
- Ornob Alam
- Center for Genomics and Systems Biology, New York University, New York, NY 10003, USA
| | - Michael D Purugganan
- Center for Genomics and Systems Biology, New York University, New York, NY 10003, USA
- Center for Genomics and Systems Biology, New York University Abu Dhabi, Abu Dhabi, United Arab Emirates
- Institute for the Study of the Ancient World, New York University, New York, NY, 10028, USA
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6
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Asadollahpour Nanaei H, Amiri Ghanatsaman Z, Farahvashi MA, Mousavi SF, Banabazi MH, Asadi Fozi M. High-throughput DNA sequence analysis elucidates novel insight into the genetic basis of adaptation in local sheep. Trop Anim Health Prod 2024; 56:150. [PMID: 38691202 DOI: 10.1007/s11250-024-04002-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2024] [Accepted: 04/23/2024] [Indexed: 05/03/2024]
Abstract
Understanding how evolutionary factors related to climate adaptation and human selection have influenced the genetic architecture of domesticated animals is of great interest in biology. In the current study, by using 304 whole genomes from different geographical regions (including Europe, north Africa, Southwest Asia, east Asia, west Africa, south Asia, east Africa, Australia and Turkey), We evaluate global sheep population dynamics in terms of genetic variation and population structure. We further conducted comparative population analysis to study the genetic underpinnings of climate adaption to local environments and also morphological traits. In order to identify genomic signals under selection, we applied fixation index (FST) and also nucleotide diversity (θπ) statistical measurements. Our results revealed several candidate genes on different chromosomes under selection for local climate adaptation (e.g. HOXC12, HOXC13, IRF1, FGD2 and GNAQ), body size (PDGFA, HMGA2, PDE3A) and also morphological related traits (RXFP2). The discovered candidate genes may offer newel insights into genetic underpinning of regional adaptation and commercially significant features in local sheep.
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Affiliation(s)
- Hojjat Asadollahpour Nanaei
- Department of Animal Science, Faculty of Agriculture, Shahid Bahonar University of Kerman, Kerman, 76169-133, PB, Iran.
- Animal Science Research Department, Fars Agricultural and Natural Resources Research and Education Center, Agricultural Research, Education and Extension Organization (AREEO), Shiraz, Iran.
| | - Zeinab Amiri Ghanatsaman
- Animal Science Research Department, Fars Agricultural and Natural Resources Research and Education Center, Agricultural Research, Education and Extension Organization (AREEO), Shiraz, Iran
| | - Mohammad Ali Farahvashi
- Department of Animal Science, Faculty of Agriculture, Shahid Bahonar University of Kerman, Kerman, 76169-133, PB, Iran
| | - Seyedeh Fatemeh Mousavi
- Department of Animal Science, Faculty of Agriculture, University of Kurdistan, Sanandaj, Iran
| | - Mohammad Hossein Banabazi
- Department of Biotechnology, Animal Science Research Institute of IRAN (ASRI) Agricultural Research, Education & Extension Organization (AREEO), 3146618361, Karaj, Iran
- Department of Animal Biosciences (HBIO), Centre for Veterinary Medicine and Animal Science (VHC), Swedish University of Agricultural Sciences (SLU), 75007, Uppsala, Sweden
| | - Masood Asadi Fozi
- Department of Animal Science, Faculty of Agriculture, Shahid Bahonar University of Kerman, Kerman, 76169-133, PB, Iran.
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7
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Lee SH, Wang CY, Li IJ, Abe G, Ota KG. Exploring the origin of a unique mutant allele in twin-tail goldfish using CRISPR/Cas9 mutants. Sci Rep 2024; 14:8716. [PMID: 38622170 PMCID: PMC11018756 DOI: 10.1038/s41598-024-58448-2] [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: 08/14/2023] [Accepted: 03/29/2024] [Indexed: 04/17/2024] Open
Abstract
Artificial selection has been widely applied to genetically fix rare phenotypic features in ornamental domesticated animals. For many of these animals, the mutated loci and alleles underlying rare phenotypes are known. However, few studies have explored whether these rare genetic mutations might have been fixed due to competition among related mutated alleles or if the fixation occurred due to contingent stochastic events. Here, we performed genetic crossing with twin-tail ornamental goldfish and CRISPR/Cas9-mutated goldfish to investigate why only a single mutated allele-chdS with a E127X stop codon (also called chdAE127X)-gives rise to the twin-tail phenotype in the modern domesticated goldfish population. Two closely related chdS mutants were generated with CRISPR/Cas9 and compared with the E127X allele in F2 and F3 generations. Both of the CRISPR/Cas9-generated alleles were equivalent to the E127X allele in terms of penetrance/expressivity of the twin-tail phenotype and viability of carriers. These findings indicate that multiple truncating mutations could have produced viable twin-tail goldfish. Therefore, the absence of polymorphic alleles for the twin-tail phenotype in modern goldfish likely stems from stochastic elimination or a lack of competing alleles in the common ancestor. Our study is the first experimental comparison of a singular domestication-derived allele with CRISPR/Cas9-generated alleles to understand how genetic fixation of a unique genotype and phenotype may have occurred. Thus, our work may provide a conceptual framework for future investigations of rare evolutionary events in domesticated animals.
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Affiliation(s)
- Shu-Hua Lee
- Laboratory of Aquatic Zoology, Marine Research Station, Institute of Cellular and Organismic Biology, Academia Sinica, Yilan, 26242, Taiwan
| | - Chen-Yi Wang
- Laboratory of Aquatic Zoology, Marine Research Station, Institute of Cellular and Organismic Biology, Academia Sinica, Yilan, 26242, Taiwan
| | - Ing-Jia Li
- Laboratory of Aquatic Zoology, Marine Research Station, Institute of Cellular and Organismic Biology, Academia Sinica, Yilan, 26242, Taiwan
| | - Gembu Abe
- Laboratory of Aquatic Zoology, Marine Research Station, Institute of Cellular and Organismic Biology, Academia Sinica, Yilan, 26242, Taiwan
- Division of Developmental Biology, Department of Functional Morphology, Faculty of Medicine, School of Life Science, Tottori University, Nishi-cho 86, Yonago, 683-8503, Japan
| | - Kinya G Ota
- Laboratory of Aquatic Zoology, Marine Research Station, Institute of Cellular and Organismic Biology, Academia Sinica, Yilan, 26242, Taiwan.
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8
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Tensen L, Fischer K. Heterozygosity is low where rare color variants in wild carnivores prevail. Ecol Evol 2024; 14:e10881. [PMID: 38327687 PMCID: PMC10847885 DOI: 10.1002/ece3.10881] [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: 07/31/2023] [Accepted: 12/04/2023] [Indexed: 02/09/2024] Open
Abstract
Coat color and pattern are a distinguished feature in mammalian carnivores, shaped by climatic cycles and habitat type. It can be expressed in various ways, such as gradients, polymorphisms, and rare color variants. Although natural selection explains much of the phenotypic variation found in the wild, genetic drift and heterozygote deficiency, as prominent in small and fragmented populations, may also affect phenotypic variability through the fixation of recessive alleles. The aim of this study was to test whether rare color variants in the wild could relate to a deficiency of heterozygotes, resulting from habitat fragmentation and small population size. We present an overview of all rare color variants in the order Carnivora, and compiled demographic and genetic data of the populations where they did and did not occur, to test for significant correlations. We also tested how phylogeny and body weight influenced the presence of color variants with phylogenetic generalized linear mixed models (PGLMMs). We found 40 color-variable species and 59 rare color variants. In 17 variable phenotypic populations for which genetic diversity was available, the average A R was 4.18, H O = 0.59, and H E = 0.66, and F IS = 0.086. We found that variable populations displayed a significant reduction in heterozygosity and allelic richness compared to non-variable populations across species. We also found a significant negative correlation between population size and inbreeding coefficients. Therefore, it is possible that small effective size had phenotypic consequences on the extant populations. The high frequency of the rare color variants (averaging 20%) also implies that genetic drift is locally overruling natural selection in small effective populations. As such, rare color variants could be added to the list of phenotypic consequences of inbreeding in the wild.
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Affiliation(s)
- Laura Tensen
- Zoology, Institute for Integrated Natural SciencesKoblenz UniversityKoblenzGermany
- Department of Zoology, Centre for Ecological Genomics and Wildlife ConservationUniversity of JohannesburgJohannesburgSouth Africa
| | - Klaus Fischer
- Zoology, Institute for Integrated Natural SciencesKoblenz UniversityKoblenzGermany
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9
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Liu X, Chen W, Huang B, Wang X, Peng Y, Zhang X, Chai W, Khan MZ, Wang C. Advancements in copy number variation screening in herbivorous livestock genomes and their association with phenotypic traits. Front Vet Sci 2024; 10:1334434. [PMID: 38274664 PMCID: PMC10808162 DOI: 10.3389/fvets.2023.1334434] [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: 11/07/2023] [Accepted: 12/27/2023] [Indexed: 01/27/2024] Open
Abstract
Copy number variations (CNVs) have garnered increasing attention within the realm of genetics due to their prevalence in human, animal, and plant genomes. These structural genetic variations have demonstrated associations with a broad spectrum of phenotypic diversity, economic traits, environmental adaptations, epidemics, and other essential aspects of both plants and animals. Furthermore, CNVs exhibit extensive sequence variability and encompass a wide array of genomes. The advancement and maturity of microarray and sequencing technologies have catalyzed a surge in research endeavors pertaining to CNVs. This is particularly prominent in the context of livestock breeding, where molecular markers have gained prominence as a valuable tool in comparison to traditional breeding methods. In light of these developments, a contemporary and comprehensive review of existing studies on CNVs becomes imperative. This review serves the purpose of providing a brief elucidation of the fundamental concepts underlying CNVs, their mutational mechanisms, and the diverse array of detection methods employed to identify these structural variations within genomes. Furthermore, it seeks to systematically analyze the recent advancements and findings within the field of CNV research, specifically within the genomes of herbivorous livestock species, including cattle, sheep, horses, and donkeys. The review also highlighted the role of CNVs in shaping various phenotypic traits including growth traits, reproductive traits, pigmentation and disease resistance etc., in herbivorous livestock. The main goal of this review is to furnish readers with an up-to-date compilation of knowledge regarding CNVs in herbivorous livestock genomes. By integrating the latest research findings and insights, it is anticipated that this review will not only offer pertinent information but also stimulate future investigations into the realm of CNVs in livestock. In doing so, it endeavors to contribute to the enhancement of breeding strategies, genomic selection, and the overall improvement of herbivorous livestock production and resistance to diseases.
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Affiliation(s)
| | | | | | | | | | | | | | - Muhammad Zahoor Khan
- Liaocheng Research Institute of Donkey High-Efficiency Breeding, Liaocheng University, Liaocheng, China
| | - Changfa Wang
- Liaocheng Research Institute of Donkey High-Efficiency Breeding, Liaocheng University, Liaocheng, China
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10
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Zhang Z, van Treuren R, Yang T, Hu Y, Zhou W, Liu H, Wei T. A comprehensive lettuce variation map reveals the impact of structural variations in agronomic traits. BMC Genomics 2023; 24:659. [PMID: 37919641 PMCID: PMC10621239 DOI: 10.1186/s12864-023-09739-x] [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: 06/20/2023] [Accepted: 10/12/2023] [Indexed: 11/04/2023] Open
Abstract
BACKGROUND As an important vegetable crop, cultivated lettuce is grown worldwide and a great variety of agronomic traits have been preserved within germplasm collections. The mechanisms underlying these phenotypic variations remain to be elucidated in association with sequence variations. Compared with single nucleotide polymorphisms, structural variations (SVs) that have more impacts on gene functions remain largely uncharacterized in the lettuce genome. RESULTS Here, we produced a comprehensive SV set for 333 wild and cultivated lettuce accessions. Comparison of SV frequencies showed that the SVs prevalent in L. sativa affected the genes enriched in carbohydrate derivative catabolic and secondary metabolic processes. Genome-wide association analysis of seven agronomic traits uncovered potentially causal SVs associated with seed coat color and leaf anthocyanin content. CONCLUSION Our work characterized a great abundance of SVs in the lettuce genome, and provides a valuable genomic resource for future lettuce breeding.
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Affiliation(s)
- Zhaowu Zhang
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
- State Key Laboratory of Agricultural Genomics, BGI Research, Shenzhen, 518083, China
| | - Rob van Treuren
- Centre for Genetic Resources, the Netherlands, Wageningen University & Research, Wageningen, the Netherlands
| | - Ting Yang
- State Key Laboratory of Agricultural Genomics, BGI Research, Shenzhen, 518083, China
| | - Yulan Hu
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
- State Key Laboratory of Agricultural Genomics, BGI Research, Shenzhen, 518083, China
| | - Wenhui Zhou
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
- State Key Laboratory of Agricultural Genomics, BGI Research, Shenzhen, 518083, China
| | - Huan Liu
- State Key Laboratory of Agricultural Genomics, BGI Research, Shenzhen, 518083, China.
| | - Tong Wei
- State Key Laboratory of Agricultural Genomics, BGI Research, Shenzhen, 518083, China.
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11
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Pulido M, Casacuberta JM. Transposable element evolution in plant genome ecosystems. CURRENT OPINION IN PLANT BIOLOGY 2023; 75:102418. [PMID: 37459733 DOI: 10.1016/j.pbi.2023.102418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 05/22/2023] [Accepted: 06/20/2023] [Indexed: 09/18/2023]
Abstract
The relationship of transposable elements (TEs) with their host genomes has usually been seen as an arms race between TEs and their host genomes. Consequently, TEs are supposed to amplify by bursts of transposition, when the TE escapes host surveillance, followed by long periods of TE quiescence and efficient host control. Recent data obtained from an increasing number of assembled plant genomes and resequencing population datasets show that TE dynamics is more complex and varies among TE families and their host genomes. This variation ranges from large genomes that accommodate large TE populations to genomes that are very active in TE elimination, and from inconspicuous elements with very low activity to elements with high transposition and elimination rates. The dynamics of each TE family results from a long history of interaction with the host in a genome populated by many other TE families, very much like an evolving ecosystem.
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Affiliation(s)
- Marc Pulido
- Center for Research in Agricultural Genomics, CRAG (CSIC-IRTA-UAB-UB), Campus UAB, Cerdanyola del Vallès, 08193 Barcelona, Spain
| | - Josep M Casacuberta
- Center for Research in Agricultural Genomics, CRAG (CSIC-IRTA-UAB-UB), Campus UAB, Cerdanyola del Vallès, 08193 Barcelona, Spain.
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12
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Smits M, Joosten H, Faye B, Burger P. Domestication of the Dromedary Revisited and Its Consequences for Legislation as to Keeping Livestock or Pet Animals. Animals (Basel) 2023; 13:2050. [PMID: 37443848 DOI: 10.3390/ani13132050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Revised: 06/13/2023] [Accepted: 06/16/2023] [Indexed: 07/15/2023] Open
Abstract
Being in an advanced stage of domestication is a newly proposed requirement to decide which animals can be safely kept by humans. Dutch legislators were the first to apply it and other European countries may be tempted to adopt a similar approach. Unexpectedly, the Dutch assessors considered the dromedary (Camelus dromedarius) as being insufficiently domesticated and this species will therefore no longer be able to be kept as a production animal from 2024 onwards. In a recent publication on this topic, we showed that the domestication of the dromedary is actually very advanced. In this paper, we apply the same criteria that were used by the Dutch assessors to determine the degree of domestication, taking into account the most recent scientific developments in this area, even though it should be noted that these criteria have neither been peer-reviewed, nor published in an international scientific journal. For the sake of comparison, and in order to validate the procedure, we also applied these criteria to the house cat. The results confirm that the dromedary is highly domesticated, but also that the house cat (Felis silvestris catus) is at most semi-domesticated. Obviously, we agree with the decision of the Dutch legislators to place the house cat on the positive list, but our analysis demonstrates that this was decided on false grounds. Our analysis makes it clear that the requirement of being in an advanced stage of domestication is not suitable. Instead of maintaining this requirement, we recommend implementing evidence-based, peer-reviewed methods to decide which animals can be kept by humans, and to include species specific-guidelines in the legislation on how this can be achieved safely.
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Affiliation(s)
- Marcel Smits
- European Camel Research Society, Johanniterlaan 7, 6721 XX Bennekom, The Netherlands
| | - Han Joosten
- Microbiologist, Chemin de Crocus 1, 1073 Mollie Margot, Switzerland
| | - Bernard Faye
- UMR SELMET, CIRAD-ES, Campus International de Baillarguet, 34398 Montpellier, France
| | - Pamela Burger
- Research Institute of Wildlife Ecology, University of Veterinary Medicine, Savoyenstrasse 1, 1160 Vienna, Austria
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Barash A, Preiss-Bloom S, Machluf Y, Fabbri E, Malkinson D, Velli E, Mucci N, Barash A, Caniglia R, Dayan T, Dekel Y. Possible origins and implications of atypical morphologies and domestication-like traits in wild golden jackals (Canis aureus). Sci Rep 2023; 13:7388. [PMID: 37149712 PMCID: PMC10164184 DOI: 10.1038/s41598-023-34533-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2022] [Accepted: 05/03/2023] [Indexed: 05/08/2023] Open
Abstract
Deciphering the origins of phenotypic variations in natural animal populations is a challenging topic for evolutionary and conservation biologists. Atypical morphologies in mammals are usually attributed to interspecific hybridisation or de-novo mutations. Here we report the case of four golden jackals (Canis aureus), that were observed during a camera-trapping wildlife survey in Northern Israel, displaying anomalous morphological traits, such as white patches, an upturned tail, and long thick fur which resemble features of domesticated mammals. Another individual was culled under permit and was genetically and morphologically examined. Paternal and nuclear genetic profiles, as well as geometric morphometric data, identified this individual as a golden jackal rather than a recent dog/wolf-jackal hybrid. Its maternal haplotype suggested past introgression of African wolf (Canis lupaster) mitochondrial DNA, as previously documented in other jackals from Israel. When viewed in the context of the jackal as an overabundant species in Israel, the rural nature of the surveyed area, the abundance of anthropogenic waste, and molecular and morphological findings, the possibility of an individual presenting incipient stages of domestication should also be considered.
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Affiliation(s)
- Ayelet Barash
- School of Zoology and The Steinhardt Museum of Natural History, Tel Aviv University, Tel Aviv, Israel
- Unit of Agrigenomics, Shamir Research Institute, University of Haifa, 1290000, Kazerin, Israel
| | - Shlomo Preiss-Bloom
- School of Zoology and The Steinhardt Museum of Natural History, Tel Aviv University, Tel Aviv, Israel
| | - Yossy Machluf
- Unit of Agrigenomics, Shamir Research Institute, University of Haifa, 1290000, Kazerin, Israel
| | - Elena Fabbri
- Unit for Conservation Genetics (BIO‑CGE), Italian Institute for Environmental Protection and Research (ISPRA), Via Cà Fornacetta 9, Ozzano dell'Emilia, 40064, Bologna, Italy
| | - Dan Malkinson
- Department of Geography and Environmental Studies, University of Haifa, 3498838, Haifa, Israel
| | - Edoardo Velli
- Unit for Conservation Genetics (BIO‑CGE), Italian Institute for Environmental Protection and Research (ISPRA), Via Cà Fornacetta 9, Ozzano dell'Emilia, 40064, Bologna, Italy
| | - Nadia Mucci
- Unit for Conservation Genetics (BIO‑CGE), Italian Institute for Environmental Protection and Research (ISPRA), Via Cà Fornacetta 9, Ozzano dell'Emilia, 40064, Bologna, Italy
| | - Alon Barash
- The Azrieli Faculty of Medicine, Bar Ilan University, 8 Henrietta Szold St, Safed, Israel
| | - Romolo Caniglia
- Unit for Conservation Genetics (BIO‑CGE), Italian Institute for Environmental Protection and Research (ISPRA), Via Cà Fornacetta 9, Ozzano dell'Emilia, 40064, Bologna, Italy.
| | - Tamar Dayan
- School of Zoology and The Steinhardt Museum of Natural History, Tel Aviv University, Tel Aviv, Israel.
| | - Yaron Dekel
- Unit of Agrigenomics, Shamir Research Institute, University of Haifa, 1290000, Kazerin, Israel.
- The Cheryl Spencer Department of Nursing and The Cheryl Spencer Institute of Nursing Research, University of Haifa, 3498838, Haifa, Israel.
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Meyer RS. Not an ortholog: Finding new genes that underlie domestication in rice species. Proc Natl Acad Sci U S A 2023; 120:e2300094120. [PMID: 37094123 PMCID: PMC10161041 DOI: 10.1073/pnas.2300094120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/26/2023] Open
Affiliation(s)
- Rachel S. Meyer
- Department of Ecology and Evolutionary Biology, University of California Santa Cruz, Santa Cruz, CA95064
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15
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Pan C, Li G, Bandyopadhyay A, Qi Y. Guide RNA library-based CRISPR screens in plants: opportunities and challenges. Curr Opin Biotechnol 2023; 79:102883. [PMID: 36603502 DOI: 10.1016/j.copbio.2022.102883] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Revised: 11/21/2022] [Accepted: 12/08/2022] [Indexed: 01/04/2023]
Abstract
Next-generation sequencing technologies have revolutionized our ability to read sequence information at the genome and transcriptome levels in a high-throughput manner. However, genetic screening at a large or genomic scale remains challenging in plants. Recently, the RNA-guided CRISPR-Cas nucleases have been optimized for high-throughput functional genomic screens combined with guide RNA (gRNA) libraries in plants. This approach has shown great promise in facilitating genetic screening, directed evolution, and quantitative trait engineering. However, this technology is still in its infancy. In this short review, we describe the recent progress in gRNA library-based CRISPR screens in plants. We provide a critical assessment of the current approaches and emerging delivery methods for CRISPR screens. We also highlight the challenges and present future perspectives on CRISPR screens in plants.
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Affiliation(s)
- Changtian Pan
- Department of Plant Science and Landscape Architecture, University of Maryland, College Park, MD 20742, USA
| | - Gen Li
- Department of Plant Science and Landscape Architecture, University of Maryland, College Park, MD 20742, USA
| | | | - Yiping Qi
- Department of Plant Science and Landscape Architecture, University of Maryland, College Park, MD 20742, USA; Institute for Bioscience and Biotechnology Research, University of Maryland, Rockville, MD 20850, USA.
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16
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Ewuola EO, Olarinre IO. Differentiation in poult plumage color of f1 progeny from crosses between white and black indigenous turkeys. Transl Anim Sci 2022; 7:txac168. [PMID: 36655232 PMCID: PMC9838091 DOI: 10.1093/tas/txac168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2022] [Accepted: 12/19/2022] [Indexed: 12/24/2022] Open
Abstract
A study assessed the poult plumage color of F1 progeny from artificially inseminated crossings between white and black indigenous turkeys. 72 hens (32 black, 40 white) and 10 toms were used (5 black and 5 white). The turkeys were grouped into four treatments based on the breeding plans: T1 (White toms × White hens), T2 (Black toms × Black hens), T3 (White toms × black hens), and T4 (Black toms × White hens). Semen was harvested from five white toms, pooled, and inseminated into hens in T1 and T3. Semen harvested from five black toms were also pooled and inseminated into hens in T2 and T4. All inseminations were carried out immediately after collection, and each hen received a dose of 0.02 mL. Insemination was done for 2 consecutive days in week 1 and once weekly; eggs were collected and incubated weekly for 12 weeks. Poult plumage colors were monitored and recorded weekly after the first 28 d. Average fertility in each of the treatments 1 (99.63%), 2 (99.81%), 3 (99.84%), and 4 (99.27%) were not significantly (P > 0.05) different among the treatments. Hatchability was highest in T2 (72.54%) and least in T1 (57.67%). Percentage white plumage poults in treatments 1, 2, 3, and 4 were 88.73%, 31.61%, 58.15%, and 54.63%, respectively. Percentage black plumage poults in T1, T2, T3, and T4 were 6.97%, 33.04%, 15.26%, and 23.76%, respectively, while 4.30%, 35.35%, 26.57%, and 21.61% were percentage checkered plumage poults in T1, T2, T3, and T4, respectively. There was no significant (P > 0.05) difference in the percentage checkered obtained in T2, T3, and T4; percentage of white poult in T3 and T4; percentage of black poult in T3 and T1. The major determinant of poult plumage color concerning quantity was the plumage color of breeder tom semen used for insemination.
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Affiliation(s)
- E O Ewuola
- Animal Physiology and Bioclimatology Unit, Department of Animal Science, Faculty of Agriculture, University of Ibadan, Ibadan, Nigeria
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17
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Stenseth NC, Andersson L, Hoekstra HE. Gregor Johann Mendel and the development of modern evolutionary biology. Proc Natl Acad Sci U S A 2022; 119:e2201327119. [PMID: 35858454 PMCID: PMC9335310 DOI: 10.1073/pnas.2201327119] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Affiliation(s)
- Nils Chr. Stenseth
- Centre for Ecological and Evolutionary Synthesis, Department of Biosciences, University of Oslo, 0316 Oslo, Norway
| | - Leif Andersson
- Department of Medical Biochemistry and Microbiology, Uppsala University, SE-751 23 Uppsala, Sweden
- Department of Veterinary Integrative Biosciences, Texas A&M University, College Station, TX 77843
| | - Hopi E. Hoekstra
- Department of Organismic & Evolutionary Biology, Harvard University, Cambridge, MA 02138
- Department of Molecular & Cellular Biology, Harvard University, Cambridge, MA 02138
- Museum of Comparative Zoology, Harvard University, Cambridge, MA 02138
- HHMI, Harvard University, Cambridge, MA 02138
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