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Recombination, chromosome number and eusociality in the Hymenoptera
Extraordinarily high rates of recombination have been observed in some eusocial species. The most popular explanation is that increased recombination increases genetic variation among workers, which in turn increases colony performance, for example by increasing parasite resistance. However, support...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
BlackWell Publishing Ltd
2015
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4328152/ https://www.ncbi.nlm.nih.gov/pubmed/25382409 http://dx.doi.org/10.1111/jeb.12543 |
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author | Ross, L Blackmon, H Lorite, P Gokhman, V E Hardy, N B |
author_facet | Ross, L Blackmon, H Lorite, P Gokhman, V E Hardy, N B |
author_sort | Ross, L |
collection | PubMed |
description | Extraordinarily high rates of recombination have been observed in some eusocial species. The most popular explanation is that increased recombination increases genetic variation among workers, which in turn increases colony performance, for example by increasing parasite resistance. However, support for the generality of higher recombination rates among eusocial organisms remains weak, due to low sample size and a lack of phylogenetic independence of observations. Recombination rate, although difficult to measure directly, is correlated with chromosome number. As predicted, several authors have noted that chromosome numbers are higher among the eusocial species of Hymenoptera (ants, bees and wasps). Here, we present a formal comparative analysis of karyotype data from 1567 species of Hymenoptera. Contrary to earlier studies, we find no evidence for an absolute difference between chromosome number in eusocial and solitary species of Hymenoptera. However, we find support for an increased rate of chromosome number change in eusocial taxa. We show that among eusocial taxa colony size is able to explain some of the variation in chromosome number: intermediate-sized colonies have more chromosomes than those that are either very small or very large. However, we were unable to detect effects of a number of other colony characteristics predicted to affect recombination rate – including colony relatedness and caste number. Taken together, our results support the view that a eusocial lifestyle has led to variable selection pressure for increased recombination rates, but that identifying the factors contributing to this variable selection will require further theoretical and empirical effort. |
format | Online Article Text |
id | pubmed-4328152 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2015 |
publisher | BlackWell Publishing Ltd |
record_format | MEDLINE/PubMed |
spelling | pubmed-43281522015-03-03 Recombination, chromosome number and eusociality in the Hymenoptera Ross, L Blackmon, H Lorite, P Gokhman, V E Hardy, N B J Evol Biol Research Papers Extraordinarily high rates of recombination have been observed in some eusocial species. The most popular explanation is that increased recombination increases genetic variation among workers, which in turn increases colony performance, for example by increasing parasite resistance. However, support for the generality of higher recombination rates among eusocial organisms remains weak, due to low sample size and a lack of phylogenetic independence of observations. Recombination rate, although difficult to measure directly, is correlated with chromosome number. As predicted, several authors have noted that chromosome numbers are higher among the eusocial species of Hymenoptera (ants, bees and wasps). Here, we present a formal comparative analysis of karyotype data from 1567 species of Hymenoptera. Contrary to earlier studies, we find no evidence for an absolute difference between chromosome number in eusocial and solitary species of Hymenoptera. However, we find support for an increased rate of chromosome number change in eusocial taxa. We show that among eusocial taxa colony size is able to explain some of the variation in chromosome number: intermediate-sized colonies have more chromosomes than those that are either very small or very large. However, we were unable to detect effects of a number of other colony characteristics predicted to affect recombination rate – including colony relatedness and caste number. Taken together, our results support the view that a eusocial lifestyle has led to variable selection pressure for increased recombination rates, but that identifying the factors contributing to this variable selection will require further theoretical and empirical effort. BlackWell Publishing Ltd 2015-01 2015-01-06 /pmc/articles/PMC4328152/ /pubmed/25382409 http://dx.doi.org/10.1111/jeb.12543 Text en © 2014 The Authors. Journal of Evolutionary Biology published by John Wiley & Sons Ltd on behalf of European Society for Evolutionary Biology. http://creativecommons.org/licenses/by/4.0/ This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Research Papers Ross, L Blackmon, H Lorite, P Gokhman, V E Hardy, N B Recombination, chromosome number and eusociality in the Hymenoptera |
title | Recombination, chromosome number and eusociality in the Hymenoptera |
title_full | Recombination, chromosome number and eusociality in the Hymenoptera |
title_fullStr | Recombination, chromosome number and eusociality in the Hymenoptera |
title_full_unstemmed | Recombination, chromosome number and eusociality in the Hymenoptera |
title_short | Recombination, chromosome number and eusociality in the Hymenoptera |
title_sort | recombination, chromosome number and eusociality in the hymenoptera |
topic | Research Papers |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4328152/ https://www.ncbi.nlm.nih.gov/pubmed/25382409 http://dx.doi.org/10.1111/jeb.12543 |
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