Evolutionary Divergence of the Genetic Architecture Underlying Photoperiodism in the Pitcher-Plant Mosquito, Wyeomyia smithii
Abstract We determine the contribution of composite additive, dominance, and epistatic effects to the genetic divergence of photoperiodic response along latitudinal, altitudinal, and longitudinal gradients in the pitcher-plant mosquito, Wyeomyia smithii. Joint scaling tests of crosses between popula...
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Oxford University Press (OUP)
1997
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Online Access: | http://dx.doi.org/10.1093/genetics/147.4.1873 http://academic.oup.com/genetics/article-pdf/147/4/1873/37016352/genetics1873.pdf |
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croxfordunivpr:10.1093/genetics/147.4.1873 2024-09-30T14:36:40+00:00 Evolutionary Divergence of the Genetic Architecture Underlying Photoperiodism in the Pitcher-Plant Mosquito, Wyeomyia smithii Lair, Kevin P Bradshaw, William E Holzapfel, Christina M 1997 http://dx.doi.org/10.1093/genetics/147.4.1873 http://academic.oup.com/genetics/article-pdf/147/4/1873/37016352/genetics1873.pdf en eng Oxford University Press (OUP) https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model Genetics volume 147, issue 4, page 1873-1883 ISSN 1943-2631 journal-article 1997 croxfordunivpr https://doi.org/10.1093/genetics/147.4.1873 2024-09-10T04:13:17Z Abstract We determine the contribution of composite additive, dominance, and epistatic effects to the genetic divergence of photoperiodic response along latitudinal, altitudinal, and longitudinal gradients in the pitcher-plant mosquito, Wyeomyia smithii. Joint scaling tests of crosses between populations showed wide-spread epistasis as well as additive and dominance differences among populations. There were differences due to epistasis between an alpine population in North Carolina and populations in Florida, lowland North Carolina, and Maine. Longitudinal displacement resulted in differences due to epistasis between Florida and Alabama populations separated by 300 km but not between Maine and Wisconsin populations separated by 2000 km. Genetic differences between New Jersey and Ontario did not involve either dominance or epistasis and we estimated the minimum number of effective factors contributing to a difference in mean critical photoperiod of 5 SD between them as nE = 5. We propose that the genetic similarity of populations within a broad northern region is due to their more recent origin since recession of the Laurentide Ice Sheet and that the unique genetic architecture of each population is the result of both mutation and repeated migration-founder-flush episodes during the dispersal of W. smithii in North America. Our results suggest that differences in composite additive and dominance effects arise early in the genetic divergence of populations while differences due to epistasis accumulate after more prolonged isolation. Article in Journal/Newspaper Ice Sheet Oxford University Press Alabama Genetics 147 4 1873 1883 |
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Open Polar |
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Oxford University Press |
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croxfordunivpr |
language |
English |
description |
Abstract We determine the contribution of composite additive, dominance, and epistatic effects to the genetic divergence of photoperiodic response along latitudinal, altitudinal, and longitudinal gradients in the pitcher-plant mosquito, Wyeomyia smithii. Joint scaling tests of crosses between populations showed wide-spread epistasis as well as additive and dominance differences among populations. There were differences due to epistasis between an alpine population in North Carolina and populations in Florida, lowland North Carolina, and Maine. Longitudinal displacement resulted in differences due to epistasis between Florida and Alabama populations separated by 300 km but not between Maine and Wisconsin populations separated by 2000 km. Genetic differences between New Jersey and Ontario did not involve either dominance or epistasis and we estimated the minimum number of effective factors contributing to a difference in mean critical photoperiod of 5 SD between them as nE = 5. We propose that the genetic similarity of populations within a broad northern region is due to their more recent origin since recession of the Laurentide Ice Sheet and that the unique genetic architecture of each population is the result of both mutation and repeated migration-founder-flush episodes during the dispersal of W. smithii in North America. Our results suggest that differences in composite additive and dominance effects arise early in the genetic divergence of populations while differences due to epistasis accumulate after more prolonged isolation. |
format |
Article in Journal/Newspaper |
author |
Lair, Kevin P Bradshaw, William E Holzapfel, Christina M |
spellingShingle |
Lair, Kevin P Bradshaw, William E Holzapfel, Christina M Evolutionary Divergence of the Genetic Architecture Underlying Photoperiodism in the Pitcher-Plant Mosquito, Wyeomyia smithii |
author_facet |
Lair, Kevin P Bradshaw, William E Holzapfel, Christina M |
author_sort |
Lair, Kevin P |
title |
Evolutionary Divergence of the Genetic Architecture Underlying Photoperiodism in the Pitcher-Plant Mosquito, Wyeomyia smithii |
title_short |
Evolutionary Divergence of the Genetic Architecture Underlying Photoperiodism in the Pitcher-Plant Mosquito, Wyeomyia smithii |
title_full |
Evolutionary Divergence of the Genetic Architecture Underlying Photoperiodism in the Pitcher-Plant Mosquito, Wyeomyia smithii |
title_fullStr |
Evolutionary Divergence of the Genetic Architecture Underlying Photoperiodism in the Pitcher-Plant Mosquito, Wyeomyia smithii |
title_full_unstemmed |
Evolutionary Divergence of the Genetic Architecture Underlying Photoperiodism in the Pitcher-Plant Mosquito, Wyeomyia smithii |
title_sort |
evolutionary divergence of the genetic architecture underlying photoperiodism in the pitcher-plant mosquito, wyeomyia smithii |
publisher |
Oxford University Press (OUP) |
publishDate |
1997 |
url |
http://dx.doi.org/10.1093/genetics/147.4.1873 http://academic.oup.com/genetics/article-pdf/147/4/1873/37016352/genetics1873.pdf |
geographic |
Alabama |
geographic_facet |
Alabama |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Genetics volume 147, issue 4, page 1873-1883 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/147.4.1873 |
container_title |
Genetics |
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147 |
container_issue |
4 |
container_start_page |
1873 |
op_container_end_page |
1883 |
_version_ |
1811639688126005248 |