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Constraining the timing of whole genome duplication in plant evolutionary history

Whole genome duplication (WGD) has occurred in many lineages within the tree of life and is invariably invoked as causal to evolutionary innovation, increased diversity, and extinction resistance. Testing such hypotheses is problematic, not least since the timing of WGD events has proven hard to con...

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Autores principales: Clark, James W., Donoghue, Philip C. J.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5524505/
https://www.ncbi.nlm.nih.gov/pubmed/28679730
http://dx.doi.org/10.1098/rspb.2017.0912
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author Clark, James W.
Donoghue, Philip C. J.
author_facet Clark, James W.
Donoghue, Philip C. J.
author_sort Clark, James W.
collection PubMed
description Whole genome duplication (WGD) has occurred in many lineages within the tree of life and is invariably invoked as causal to evolutionary innovation, increased diversity, and extinction resistance. Testing such hypotheses is problematic, not least since the timing of WGD events has proven hard to constrain. Here we show that WGD events can be dated through molecular clock analysis of concatenated gene families, calibrated using fossil evidence for the ages of species divergences that bracket WGD events. We apply this approach to dating the two major genome duplication events shared by all seed plants (ζ) and flowering plants (ɛ), estimating the seed plant WGD event at 399–381 Ma, and the angiosperm WGD event at 319–297 Ma. These events thus took place early in the stem of both lineages, precluding hypotheses of WGD conferring extinction resistance, driving dramatic increases in innovation and diversity, but corroborating and qualifying the more permissive hypothesis of a ‘lag-time’ in realizing the effects of WGD in plant evolution.
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spelling pubmed-55245052018-02-01 Constraining the timing of whole genome duplication in plant evolutionary history Clark, James W. Donoghue, Philip C. J. Proc Biol Sci Palaeobiology Whole genome duplication (WGD) has occurred in many lineages within the tree of life and is invariably invoked as causal to evolutionary innovation, increased diversity, and extinction resistance. Testing such hypotheses is problematic, not least since the timing of WGD events has proven hard to constrain. Here we show that WGD events can be dated through molecular clock analysis of concatenated gene families, calibrated using fossil evidence for the ages of species divergences that bracket WGD events. We apply this approach to dating the two major genome duplication events shared by all seed plants (ζ) and flowering plants (ɛ), estimating the seed plant WGD event at 399–381 Ma, and the angiosperm WGD event at 319–297 Ma. These events thus took place early in the stem of both lineages, precluding hypotheses of WGD conferring extinction resistance, driving dramatic increases in innovation and diversity, but corroborating and qualifying the more permissive hypothesis of a ‘lag-time’ in realizing the effects of WGD in plant evolution. The Royal Society 2017-07-12 2017-07-05 /pmc/articles/PMC5524505/ /pubmed/28679730 http://dx.doi.org/10.1098/rspb.2017.0912 Text en © 2017 The Authors. http://creativecommons.org/licenses/by/4.0/ Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.
spellingShingle Palaeobiology
Clark, James W.
Donoghue, Philip C. J.
Constraining the timing of whole genome duplication in plant evolutionary history
title Constraining the timing of whole genome duplication in plant evolutionary history
title_full Constraining the timing of whole genome duplication in plant evolutionary history
title_fullStr Constraining the timing of whole genome duplication in plant evolutionary history
title_full_unstemmed Constraining the timing of whole genome duplication in plant evolutionary history
title_short Constraining the timing of whole genome duplication in plant evolutionary history
title_sort constraining the timing of whole genome duplication in plant evolutionary history
topic Palaeobiology
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5524505/
https://www.ncbi.nlm.nih.gov/pubmed/28679730
http://dx.doi.org/10.1098/rspb.2017.0912
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