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Loss of phenotypic plasticity generates genotype-caste association in harvester ants

Loss of phenotypic plasticity generates genotype-caste association in harvester ants
Loss of phenotypic plasticity generates genotype-caste association in harvester ants
Caste differentiation and reproductive division of labor are the hallmarks of insect societies [1]. In ants and other social Hymenoptera, development of female larvae into queens or workers generally results from environmentally induced differences in gene expression 2, 3 and 4. However, several cases in which certain gene combinations may determine reproductive status have been described in bees [5] and ants 6, 7, 8 and 9. We investigated experimentally whether genotype directly influences caste determination in two populations of Pogonomyrmex harvester ants in which genotype-caste associations have been observed. Each population contains two genetic lineages [10]. Queens are polyandrous 11 and 12 and mate with males of both lineages 6 and 7, but in mature colonies, over 95% of daughter queens have a pure-lineage genome, whereas all workers are of F1 interlineage ancestry 6, 7 and 8. We found that this pattern is maintained throughout the colony life cycle, even when only a single caste is being produced. Through controlled crosses, we demonstrate that pure-lineage eggs fail to develop into workers even when interlineage brood are not present. Thus, environmental caste determination in these individuals appears to have been lost in favor of a hardwired genetic mechanism. Our results reveal that genetic control of reproductive fate can persist without loss of the eusocial caste structure.
0960-9822
2277-2282
Cahan, S.H.
91f7f5bd-ee33-4ab2-a233-36997908ab93
Julian, G.E.
991cfc21-89b5-4fc0-ac7f-02f0c4e39298
Rissing, S.W.
c558b6cc-3131-4b58-a553-079648dbf2a5
Schwander, T.
c0c9ece5-a559-4f6e-8f0e-e65fb580da53
Parker, J.D.
34055903-007a-42d0-b1af-2717f217ab41
Keller, L.
cae35dbf-c124-48f4-8e37-97510c812afd
Cahan, S.H.
91f7f5bd-ee33-4ab2-a233-36997908ab93
Julian, G.E.
991cfc21-89b5-4fc0-ac7f-02f0c4e39298
Rissing, S.W.
c558b6cc-3131-4b58-a553-079648dbf2a5
Schwander, T.
c0c9ece5-a559-4f6e-8f0e-e65fb580da53
Parker, J.D.
34055903-007a-42d0-b1af-2717f217ab41
Keller, L.
cae35dbf-c124-48f4-8e37-97510c812afd

Cahan, S.H., Julian, G.E., Rissing, S.W., Schwander, T., Parker, J.D. and Keller, L. (2004) Loss of phenotypic plasticity generates genotype-caste association in harvester ants. Current Biology, 14 (24), 2277-2282. (doi:10.1016/j.cub.2004.12.027).

Record type: Article

Abstract

Caste differentiation and reproductive division of labor are the hallmarks of insect societies [1]. In ants and other social Hymenoptera, development of female larvae into queens or workers generally results from environmentally induced differences in gene expression 2, 3 and 4. However, several cases in which certain gene combinations may determine reproductive status have been described in bees [5] and ants 6, 7, 8 and 9. We investigated experimentally whether genotype directly influences caste determination in two populations of Pogonomyrmex harvester ants in which genotype-caste associations have been observed. Each population contains two genetic lineages [10]. Queens are polyandrous 11 and 12 and mate with males of both lineages 6 and 7, but in mature colonies, over 95% of daughter queens have a pure-lineage genome, whereas all workers are of F1 interlineage ancestry 6, 7 and 8. We found that this pattern is maintained throughout the colony life cycle, even when only a single caste is being produced. Through controlled crosses, we demonstrate that pure-lineage eggs fail to develop into workers even when interlineage brood are not present. Thus, environmental caste determination in these individuals appears to have been lost in favor of a hardwired genetic mechanism. Our results reveal that genetic control of reproductive fate can persist without loss of the eusocial caste structure.

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Published date: 1 December 2004

Identifiers

Local EPrints ID: 56418
URI: https://eprints.soton.ac.uk/id/eprint/56418
ISSN: 0960-9822
PURE UUID: 3f6a451f-fa01-4956-b94e-086db22efa88

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Date deposited: 07 Aug 2008
Last modified: 13 Mar 2019 20:35

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