Strong selection pressures maintain divergence on genomic islands in Atlantic cod (Gadus morhua L.) populations
Abstract Background Two distinct populations have been extensively studied in Atlantic cod (Gadus morhua L.): the Northeast Arctic cod (NEAC) population and the coastal cod (CC) population. The objectives of the current study were to identify genomic islands of divergence and to propose an approach...
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ftdoajarticles:oai:doaj.org/article:76e5cc64098446e7b45b73fb3e691004 2023-05-15T14:30:30+02:00 Strong selection pressures maintain divergence on genomic islands in Atlantic cod (Gadus morhua L.) populations Silvia T. Rodríguez-Ramilo Matthew Baranski Hooman Moghadam Harald Grove Sigbjørn Lien Mike E. Goddard Theo H. E. Meuwissen Anna K. Sonesson 2019-10-01T00:00:00Z https://doi.org/10.1186/s12711-019-0503-5 https://doaj.org/article/76e5cc64098446e7b45b73fb3e691004 DE EN FR ger eng fre BMC http://link.springer.com/article/10.1186/s12711-019-0503-5 https://doaj.org/toc/1297-9686 doi:10.1186/s12711-019-0503-5 1297-9686 https://doaj.org/article/76e5cc64098446e7b45b73fb3e691004 Genetics Selection Evolution, Vol 51, Iss 1, Pp 1-15 (2019) Animal culture SF1-1100 Genetics QH426-470 article 2019 ftdoajarticles https://doi.org/10.1186/s12711-019-0503-5 2022-12-31T05:06:06Z Abstract Background Two distinct populations have been extensively studied in Atlantic cod (Gadus morhua L.): the Northeast Arctic cod (NEAC) population and the coastal cod (CC) population. The objectives of the current study were to identify genomic islands of divergence and to propose an approach to quantify the strength of selection pressures using whole-genome single nucleotide polymorphism (SNP) data. After applying filtering criteria, information on 93 animals (9 CC individuals, 50 NEAC animals and 34 CC × NEAC crossbred individuals) and 3,123,434 autosomal SNPs were used. Results Four genomic islands of divergence were identified on chromosomes 1, 2, 7 and 12, which were mapped accurately based on SNP data and which extended in size from 11 to 18 Mb. These regions differed considerably between the two populations although the differences in the rest of the genome were small due to considerable gene flow between the populations. The estimates of selection pressures showed that natural selection was substantially more important than genetic drift in shaping these genomic islands. Our data confirmed results from earlier publications that suggested that genomic islands are due to chromosomal rearrangements that are under strong selection and reduce recombination between rearranged and non-rearranged segments. Conclusions Our findings further support the hypothesis that selection and reduced recombination in genomic islands may promote speciation between these two populations although their habitats overlap considerably and migrations occur between them. Article in Journal/Newspaper Arctic cod Arctic atlantic cod Gadus morhua Northeast Arctic cod Directory of Open Access Journals: DOAJ Articles Arctic Genetics Selection Evolution 51 1 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
German English French |
topic |
Animal culture SF1-1100 Genetics QH426-470 |
spellingShingle |
Animal culture SF1-1100 Genetics QH426-470 Silvia T. Rodríguez-Ramilo Matthew Baranski Hooman Moghadam Harald Grove Sigbjørn Lien Mike E. Goddard Theo H. E. Meuwissen Anna K. Sonesson Strong selection pressures maintain divergence on genomic islands in Atlantic cod (Gadus morhua L.) populations |
topic_facet |
Animal culture SF1-1100 Genetics QH426-470 |
description |
Abstract Background Two distinct populations have been extensively studied in Atlantic cod (Gadus morhua L.): the Northeast Arctic cod (NEAC) population and the coastal cod (CC) population. The objectives of the current study were to identify genomic islands of divergence and to propose an approach to quantify the strength of selection pressures using whole-genome single nucleotide polymorphism (SNP) data. After applying filtering criteria, information on 93 animals (9 CC individuals, 50 NEAC animals and 34 CC × NEAC crossbred individuals) and 3,123,434 autosomal SNPs were used. Results Four genomic islands of divergence were identified on chromosomes 1, 2, 7 and 12, which were mapped accurately based on SNP data and which extended in size from 11 to 18 Mb. These regions differed considerably between the two populations although the differences in the rest of the genome were small due to considerable gene flow between the populations. The estimates of selection pressures showed that natural selection was substantially more important than genetic drift in shaping these genomic islands. Our data confirmed results from earlier publications that suggested that genomic islands are due to chromosomal rearrangements that are under strong selection and reduce recombination between rearranged and non-rearranged segments. Conclusions Our findings further support the hypothesis that selection and reduced recombination in genomic islands may promote speciation between these two populations although their habitats overlap considerably and migrations occur between them. |
format |
Article in Journal/Newspaper |
author |
Silvia T. Rodríguez-Ramilo Matthew Baranski Hooman Moghadam Harald Grove Sigbjørn Lien Mike E. Goddard Theo H. E. Meuwissen Anna K. Sonesson |
author_facet |
Silvia T. Rodríguez-Ramilo Matthew Baranski Hooman Moghadam Harald Grove Sigbjørn Lien Mike E. Goddard Theo H. E. Meuwissen Anna K. Sonesson |
author_sort |
Silvia T. Rodríguez-Ramilo |
title |
Strong selection pressures maintain divergence on genomic islands in Atlantic cod (Gadus morhua L.) populations |
title_short |
Strong selection pressures maintain divergence on genomic islands in Atlantic cod (Gadus morhua L.) populations |
title_full |
Strong selection pressures maintain divergence on genomic islands in Atlantic cod (Gadus morhua L.) populations |
title_fullStr |
Strong selection pressures maintain divergence on genomic islands in Atlantic cod (Gadus morhua L.) populations |
title_full_unstemmed |
Strong selection pressures maintain divergence on genomic islands in Atlantic cod (Gadus morhua L.) populations |
title_sort |
strong selection pressures maintain divergence on genomic islands in atlantic cod (gadus morhua l.) populations |
publisher |
BMC |
publishDate |
2019 |
url |
https://doi.org/10.1186/s12711-019-0503-5 https://doaj.org/article/76e5cc64098446e7b45b73fb3e691004 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic cod Arctic atlantic cod Gadus morhua Northeast Arctic cod |
genre_facet |
Arctic cod Arctic atlantic cod Gadus morhua Northeast Arctic cod |
op_source |
Genetics Selection Evolution, Vol 51, Iss 1, Pp 1-15 (2019) |
op_relation |
http://link.springer.com/article/10.1186/s12711-019-0503-5 https://doaj.org/toc/1297-9686 doi:10.1186/s12711-019-0503-5 1297-9686 https://doaj.org/article/76e5cc64098446e7b45b73fb3e691004 |
op_doi |
https://doi.org/10.1186/s12711-019-0503-5 |
container_title |
Genetics Selection Evolution |
container_volume |
51 |
container_issue |
1 |
_version_ |
1766304333899497472 |