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Article Dans Une Revue Nature Ecology & Evolution Année : 2020

Evolution of a supergene that regulates a trans-species social polymorphism

Zheng Yan
  • Fonction : Auteur
Simon H Martin
  • Fonction : Auteur
Dietrich Gotzek
Samuel V Arsenault
Pablo Duchen
  • Fonction : Auteur
Quentin Helleu
Oksana Riba-Grognuz
  • Fonction : Auteur
Brendan G Hunt
Nicolas Salamin
Dewayne Shoemaker
  • Fonction : Auteur
Kenneth G Ross
Laurent Keller

Résumé

hile it is becoming increasingly clear that many animal species exhibit variation in social organization, the underlying causes are rarely understood. The first discovery of a genetic basis for such variation was in the fire ant Solenopsis invicta 1,2. In this species, variation at a genomic region containing the odorant-binding protein gene Gp-9 determines whether colonies contain just one (monogyne social form) or multiple (polygyne form) queens 2,3 , a fundamental distinction associated with a suite of other important individual-and colony-level phenotypic differences 4. Studies of invasive US populations revealed that Gp-9 is located in a supergene on the 'social chromosome' (chromosome 16) and that the Social b (Sb) haplotype harbouring the Gp-9 b allele apparently does not recombine with the Social B (SB) haplotype containing the alternate Gp-9 B allele 5. In the United States, monogyne colonies invariably contain a single homozygous SB/SB queen and only SB/SB workers, while polygyne colonies always contain multiple heterozygous (SB/Sb) queens together with predominantly SB/Sb and SB/SB workers (Sb/Sb females have low viability and SB/SB queens are killed by nestmate workers in polygyne colonies 4,6). Reconstruction of the routes of supergene evolution is a longstanding goal with important implications for our understanding of how these remarkable genomic entities come to regulate the myriad features of complex phenotypes 7-10. We conducted a comparative genomic study of several fire ant species sampled from their native ranges to characterize fully variation at the fire ant supergene and, thereby, explain its origin and subsequent evolution.
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Dates et versions

hal-03878160 , version 1 (29-11-2022)

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Zheng Yan, Simon H Martin, Dietrich Gotzek, Samuel V Arsenault, Pablo Duchen, et al.. Evolution of a supergene that regulates a trans-species social polymorphism. Nature Ecology & Evolution, 2020, 4 (2), pp.240-249. ⟨10.1038/s41559-019-1081-1⟩. ⟨hal-03878160⟩
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