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Kato S, Arakaki S, Nagano AJ, Kikuchi K, Hirase S. Genomic landscape of introgression from the ghost lineage in a gobiid fish uncovers the generality of forces shaping hybrid genomes. Mol Ecol 2023. [PMID: 38047388 DOI: 10.1111/mec.17216] [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: 07/14/2023] [Revised: 09/23/2023] [Accepted: 10/26/2023] [Indexed: 12/05/2023]
Abstract
Extinct lineages can leave legacies in the genomes of extant lineages through ancient introgressive hybridization. The patterns of genomic survival of these extinct lineages provide insight into the role of extinct lineages in current biodiversity. However, our understanding on the genomic landscape of introgression from extinct lineages remains limited due to challenges associated with locating the traces of unsampled 'ghost' extinct lineages without ancient genomes. Herein, we conducted population genomic analyses on the East China Sea (ECS) lineage of Chaenogobius annularis, which was suspected to have originated from ghost introgression, with the aim of elucidating its genomic origins and characterizing its landscape of introgression. By combining phylogeographic analysis and demographic modelling, we demonstrated that the ECS lineage originated from ancient hybridization with an extinct ghost lineage. Forward simulations based on the estimated demography indicated that the statistic γ of the HyDe analysis can be used to distinguish the differences in local introgression rates in our data. Consistent with introgression between extant organisms, we found reduced introgression from extinct lineage in regions with low recombination rates and with functional importance, thereby suggesting a role of linked selection that has eliminated the extinct lineage in shaping the hybrid genome. Moreover, we identified enrichment of repetitive elements in regions associated with ghost introgression, which was hitherto little known but was also observed in the re-analysis of published data on introgression between extant organisms. Overall, our findings underscore the unexpected similarities in the characteristics of introgression landscapes across different taxa, even in cases of ghost introgression.
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Affiliation(s)
- Shuya Kato
- Fisheries Laboratory, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Hamamatsu, Shizuoka, Japan
| | - Seiji Arakaki
- Amakusa Marine Biological Laboratory, Kyushu University, Amakusa, Kumamoto, Japan
| | - Atsushi J Nagano
- Department of Life Sciences, Faculty of Agriculture, Ryukoku University, Ōtsu, Shiga, Japan
- Institute for Advanced Biosciences, Keio University, Tsuruoka, Yamagata, Japan
| | - Kiyoshi Kikuchi
- Fisheries Laboratory, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Hamamatsu, Shizuoka, Japan
| | - Shotaro Hirase
- Fisheries Laboratory, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Hamamatsu, Shizuoka, Japan
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Nedoluzhko A. Sea of opportunities: marine genomics in an era of global environmental change. BMC Genomics 2023; 24:286. [PMID: 37237270 DOI: 10.1186/s12864-023-09392-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2023] [Accepted: 05/19/2023] [Indexed: 05/28/2023] Open
Abstract
Overexploitation of natural resources and pollution of seas, acidification of the ocean, and rising temperatures all contribute to the destruction of marine habitats and, in 2015, the protection of the ocean became one of the UN Sustainable Development Goals (SDG 14: Life Below Water). This collection aims to highlight the molecular genetic changes currently happening in marine organisms.
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Affiliation(s)
- Artem Nedoluzhko
- Paleogenomics Laboratory, European University at St. Petersburg, 6/1A Gagarinskaya Street, St. Petersburg, 191187, Russia.
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Nedoluzhko A, Orlova SY, Kurnosov DS, Orlov AM, Galindo-Villegas J, Rastorguev SM. Genomic Signatures of Freshwater Adaptation in Pacific Herring ( Clupea pallasii). Genes (Basel) 2022; 13:genes13101856. [PMID: 36292743 PMCID: PMC9601299 DOI: 10.3390/genes13101856] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Revised: 10/10/2022] [Accepted: 10/13/2022] [Indexed: 11/04/2022] Open
Abstract
Pacific herring (Clupea pallasii) is an essential target of commercial fishing in the North Pacific Ocean. Previous studies have suggested the existence of marine and lake ecological forms of this species within its range. The lake ecological form of herring has a shortened life cycle, spending the winter and spawning in brackish waters near the shoreline without long migrations for feeding; it also has a relatively smaller body size than the marine form. Genetic-based studies have shown that brackish water Pacific herring not only can be distinguished as a separate lake ecological form but possibly has its genetic legacy. Here, as part of an ongoing study, using ddRAD-sequencing data for marine and lake ecological forms from a total of 54 individuals and methods of comparative bioinformatics, we describe genomic signatures of freshwater adaptivity in Pacific herring. In total, 253 genes containing discriminating SNPs were found, and part of those genes was organized into genome clusters, also known as “genomic islands of divergence”. Moreover, the Tajima’s D test showed that these loci are under directional selection in the lake populations of the Pacific herring. Yet, most discriminating loci between the lake and marine ecological forms of Pacific herring do not intersect (by gene name) with those in other known marine fish species with known freshwater/brackish populations. However, some are associated with the same physiological trait—osmoregulation.
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Affiliation(s)
- Artem Nedoluzhko
- Paleogenomics Laboratory, European University at Saint Petersburg, 191187 Saint Petersburg, Russia
- Limited Liability Company ELGENE, 109029 Moscow, Russia
| | - Svetlana Yu. Orlova
- Laboratory of Molecular Genetics, Russian Federal Research Institute of Fisheries and Oceanography, 107140 Moscow, Russia
- Laboratory of Genetic Basis of Identification, Vavilov Institute of General Genetics of the Russian Academy of Sciences, 119991 Moscow, Russia
- Correspondence: (S.Y.O.); (J.G.-V.); (S.M.R.)
| | - Denis S. Kurnosov
- Research Group of Intraspecific Differentiation, Russian Federal Research Institute of Fisheries and Oceanography, Pacific Branch (TINRO), 690091 Vladivostok, Russia
| | - Alexei M. Orlov
- Laboratory of Oceanic Ichthyofauna, Shirshov Institute of Oceanology of the Russian Academy of Sciences, 117218 Moscow, Russia
- Laboratory of Behavior of Lower Vertebrates, A.N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, 119071 Moscow, Russia
- Department of Ichthyology, Dagestan State University, 367000 Makhachkala, Russia
- Department of Ichthyology and Hydrobiology, Tomsk State University, 634050 Tomsk, Russia
- Laboratory of Marine Biology, Caspian Institute of Biological Resources, Russian Academy of Sciences, 367000 Makhachkala, Russia
| | - Jorge Galindo-Villegas
- Genomics Division, Faculty of Biosciences and Aquaculture, Nord University, 8049 Bodø, Norway
- Correspondence: (S.Y.O.); (J.G.-V.); (S.M.R.)
| | - Sergey M. Rastorguev
- Limited Liability Company ELGENE, 109029 Moscow, Russia
- Kurchatov Center for Genomic Research, National Research Centre “Kurchatov Institute”, 123182 Moscow, Russia
- Correspondence: (S.Y.O.); (J.G.-V.); (S.M.R.)
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