A simple genetic basis for complex social behaviour mediates widespread gene expression differences.

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Version: Final published version
Serval ID
serval:BIB_0243F6143E78
Type
Article: article from journal or magazin.
Collection
Publications
Title
A simple genetic basis for complex social behaviour mediates widespread gene expression differences.
Journal
Molecular Ecology
Author(s)
Nipitwattanaphon M., Wang J., Dijkstra M.B., Keller L.
ISSN
1365-294X (Electronic)
ISSN-L
0962-1083
Publication state
Published
Issued date
2013
Volume
22
Number
14
Pages
3797-3813
Language
english
Abstract
A remarkable social polymorphism is controlled by a single Mendelian factor in the fire ant Solenopsis invicta. A genomic element marked by the gene Gp-9 determines whether workers tolerate one or many fertile queens in their colony. Gp-9 was recently shown to be part of a supergene with two nonrecombining variants, SB and Sb. SB/SB and SB/Sb queens differ in how they initiate new colonies, and in many physiological traits, for example odour and maturation rate. To understand how a single genetic element can affect all these traits, we used a microarray to compare gene expression patterns between SB/SB and SB/Sb queens of three different age classes: 1-day-old unmated queens, 11-day-old unmated queens and mated, fully reproductive queens collected from mature field colonies. The number of genes that were differentially expressed between SB/SB and SB/Sb queens of the same age class was smallest in 1-day-old queens, maximal in 11-day-old queens and intermediate in reproductive queens. Gene ontology analysis showed that SB/SB queens upregulate reproductive genes faster than SB/Sb queens. For all age classes, genes inside the supergene were overrepresented among the differentially expressed genes. Consistent with the hypothesized greater number of transposons in the Sb supergene, 13 transposon genes were upregulated in SB/Sb queens. Viral genes were also upregulated in SB/Sb mature queens, consistent with the known greater parasite load in colonies headed by SB/Sb queens compared with colonies headed by SB/SB queens. Eighteen differentially expressed genes between reproductive queens were involved in chemical signalling. Our results suggest that many genes in the supergene are involved in regulating social organization and queen phenotypes in fire ants.
Keywords
fire ants, Gp-9, maturation, monogyne, polygyne, queen, queen odour, social form, Solenopsis invicta, supergene
Pubmed
Web of science
Open Access
Yes
Create date
09/04/2013 9:11
Last modification date
20/08/2019 12:24
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