Complex hybrid origin of genetic caste determination in harvester ants

Details

Ressource 1Download: BIB_5832BE9BE9E6.P001.pdf (194.56 [Ko])
State: Public
Version: author
Serval ID
serval:BIB_5832BE9BE9E6
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Complex hybrid origin of genetic caste determination in harvester ants
Journal
Nature
Author(s)
Helms Cahan  S., Keller  L.
ISSN
1476-4687
Publication state
Published
Issued date
07/2003
Peer-reviewed
Oui
Volume
424
Number
6946
Pages
306-9
Notes
Journal Article Research Support, Non-U.S. Gov't --- Old month value: Jul 17
Abstract
Caste differentiation and division of labour are the hallmarks of insect societies and at the root of their ecological success. Kin selection predicts that caste determination should result from environmentally induced differences in gene expression, a prediction largely supported by empirical data. However, two exceptional cases of genetically determined caste differentiation have recently been found in harvester ants. Here we show that genetic caste determination evolved in these populations after complex hybridization events. We identified four distinct genetic lineages, each consisting of unique blends of the genomes of the parental species, presumably Pogonomyrmex barbatus and P. rugosus. Crosses between lineages H1 and H2 and between J1 and J2 give rise to workers, whereas queens develop from within-lineage matings. Although historical gene flow is evident, genetic exchange among lineages and between lineages and the parental species no longer occurs. This unusual system of caste determination seems to be evolutionarily stable.
Keywords
Animals Ants/classification/*genetics/*physiology Crosses, Genetic Female Gene Frequency Genome Genotype Male Models, Genetic Phylogeny *Social Dominance Species Specificity
Pubmed
Web of science
Create date
24/01/2008 19:39
Last modification date
20/08/2019 15:12
Usage data