Relaxed selection underlies genome erosion in socially parasitic ant species

Lukas Schrader, Hailin Pan, Martin Bollazzi, Morten Schiøtt, Fredrick J. Larabee, Xupeng Bi, Yuan Deng, Guojie Zhang, Jacobus J. Boomsma, Christian Rabeling

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


Inquiline ants are highly specialized and obligate social parasites that infiltrate and exploit colonies of closely related species. They have evolved many times convergently, are often evolutionarily young lineages, and are almost invariably rare. Focusing on the leaf-cutting ant genus Acromyrmex, we compared genomes of three inquiline social parasites with their free-living, closely-related hosts. The social parasite genomes show distinct signatures of erosion compared to the host lineages, as a consequence of relaxed selective constraints on traits associated with cooperative ant colony life and of inquilines having very small effective population sizes. We find parallel gene losses, particularly in olfactory receptors, consistent with inquiline species having highly reduced social behavioral repertoires. Many of the genomic changes that we uncover resemble those observed in the genomes of obligate non-social parasites and intracellular endosymbionts that branched off into highly specialized, host-dependent niches.

Original languageEnglish (US)
Article number2918
JournalNature communications
Issue number1
StatePublished - Dec 1 2021

ASJC Scopus subject areas

  • General Chemistry
  • General Biochemistry, Genetics and Molecular Biology
  • General Physics and Astronomy


Dive into the research topics of 'Relaxed selection underlies genome erosion in socially parasitic ant species'. Together they form a unique fingerprint.

Cite this