Linkage Relationships Reflecting Ancestral Tetraploidy in Salmonid Fish
ABSTRACT Fifteen classical linkage groups were identified in two salmonid species (Salmo trutta and Salmo gairdneri) and three fertile, interspecific hybrids (S. gairdneri × Salmo clarki, Salvelinus fontinalis × Salvelinus namaycush and S. fontinalisx Salvelinus alpinus) by backcrossing multiply het...
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Oxford University Press (OUP)
1987
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Online Access: | http://dx.doi.org/10.1093/genetics/116.4.579 http://academic.oup.com/genetics/article-pdf/116/4/579/37002075/genetics0579.pdf |
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croxfordunivpr:10.1093/genetics/116.4.579 2024-05-12T08:10:32+00:00 Linkage Relationships Reflecting Ancestral Tetraploidy in Salmonid Fish Johnson, K R Wright, J E May, B 1987 http://dx.doi.org/10.1093/genetics/116.4.579 http://academic.oup.com/genetics/article-pdf/116/4/579/37002075/genetics0579.pdf en eng Oxford University Press (OUP) https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model Genetics volume 116, issue 4, page 579-591 ISSN 1943-2631 Genetics journal-article 1987 croxfordunivpr https://doi.org/10.1093/genetics/116.4.579 2024-04-18T08:16:24Z ABSTRACT Fifteen classical linkage groups were identified in two salmonid species (Salmo trutta and Salmo gairdneri) and three fertile, interspecific hybrids (S. gairdneri × Salmo clarki, Salvelinus fontinalis × Salvelinus namaycush and S. fontinalisx Salvelinus alpinus) by backcrossing multiply heterozygous individuals. These linkage relationships of electrophoretically detected, protein coding loci were highly conserved among species. The loci encoding the enzymes appeared to be randomly distributed among the salmonid chromosomes. Recombination frequencies were generally greater in females than in males. In males, certain linkage groups were pseudolinked with other linkage groups, presumably because of facultative multivalent pairing and directed disjunction of chromosomes. Five such pseudolinkage groups were identified and they also appeared to be common among species and hybrids. Duplicate loci were never classically linked with each other, although some exhibited pseudolinkage and some showed evidence of exchanging alleles. Gene-centromere recombination frequencies estimated from genotypic distributions of gynogenetic offspring were consistent with map locations inferred from female intergenic recombination frequencies. These linkage relationships support the contention that all extant salmonids arose from a common tetraploid progenitor and that this progenitor may have been a segmental allotetraploid. Article in Journal/Newspaper Salvelinus alpinus Oxford University Press Genetics 116 4 579 591 |
institution |
Open Polar |
collection |
Oxford University Press |
op_collection_id |
croxfordunivpr |
language |
English |
topic |
Genetics |
spellingShingle |
Genetics Johnson, K R Wright, J E May, B Linkage Relationships Reflecting Ancestral Tetraploidy in Salmonid Fish |
topic_facet |
Genetics |
description |
ABSTRACT Fifteen classical linkage groups were identified in two salmonid species (Salmo trutta and Salmo gairdneri) and three fertile, interspecific hybrids (S. gairdneri × Salmo clarki, Salvelinus fontinalis × Salvelinus namaycush and S. fontinalisx Salvelinus alpinus) by backcrossing multiply heterozygous individuals. These linkage relationships of electrophoretically detected, protein coding loci were highly conserved among species. The loci encoding the enzymes appeared to be randomly distributed among the salmonid chromosomes. Recombination frequencies were generally greater in females than in males. In males, certain linkage groups were pseudolinked with other linkage groups, presumably because of facultative multivalent pairing and directed disjunction of chromosomes. Five such pseudolinkage groups were identified and they also appeared to be common among species and hybrids. Duplicate loci were never classically linked with each other, although some exhibited pseudolinkage and some showed evidence of exchanging alleles. Gene-centromere recombination frequencies estimated from genotypic distributions of gynogenetic offspring were consistent with map locations inferred from female intergenic recombination frequencies. These linkage relationships support the contention that all extant salmonids arose from a common tetraploid progenitor and that this progenitor may have been a segmental allotetraploid. |
format |
Article in Journal/Newspaper |
author |
Johnson, K R Wright, J E May, B |
author_facet |
Johnson, K R Wright, J E May, B |
author_sort |
Johnson, K R |
title |
Linkage Relationships Reflecting Ancestral Tetraploidy in Salmonid Fish |
title_short |
Linkage Relationships Reflecting Ancestral Tetraploidy in Salmonid Fish |
title_full |
Linkage Relationships Reflecting Ancestral Tetraploidy in Salmonid Fish |
title_fullStr |
Linkage Relationships Reflecting Ancestral Tetraploidy in Salmonid Fish |
title_full_unstemmed |
Linkage Relationships Reflecting Ancestral Tetraploidy in Salmonid Fish |
title_sort |
linkage relationships reflecting ancestral tetraploidy in salmonid fish |
publisher |
Oxford University Press (OUP) |
publishDate |
1987 |
url |
http://dx.doi.org/10.1093/genetics/116.4.579 http://academic.oup.com/genetics/article-pdf/116/4/579/37002075/genetics0579.pdf |
genre |
Salvelinus alpinus |
genre_facet |
Salvelinus alpinus |
op_source |
Genetics volume 116, issue 4, page 579-591 ISSN 1943-2631 |
op_rights |
https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model |
op_doi |
https://doi.org/10.1093/genetics/116.4.579 |
container_title |
Genetics |
container_volume |
116 |
container_issue |
4 |
container_start_page |
579 |
op_container_end_page |
591 |
_version_ |
1798853995112955904 |