Gene Coexpression Network Reveals Highly Conserved, Well-Regulated Anti-Ageing Mechanisms in Old Ant Queens.

Mark C Harrison, Luisa M Jaimes Niño, Marisa Almeida Rodrigues, Judith Ryll, Thomas Flatt, Jan Oettler, Erich Bornberg-Bauer
Author Information
  1. Mark C Harrison: Institute for Evolution and Biodiversity, University of Münster, Germany. ORCID
  2. Luisa M Jaimes Niño: Institut für Zoologie/Evolutionsbiologie, University of Regensburg, Germany.
  3. Marisa Almeida Rodrigues: Department of Biology, University of Fribourg, Switzerland.
  4. Judith Ryll: Institute for Evolution and Biodiversity, University of Münster, Germany.
  5. Thomas Flatt: Department of Biology, University of Fribourg, Switzerland. ORCID
  6. Jan Oettler: Institut für Zoologie/Evolutionsbiologie, University of Regensburg, Germany. ORCID
  7. Erich Bornberg-Bauer: Department of Biology, University of Fribourg, Switzerland. ORCID

Abstract

Evolutionary theories of ageing predict a reduction in selection efficiency with age, a so-called "selection shadow," due to extrinsic mortality decreasing effective population size with age. Classic symptoms of ageing include a deterioration in transcriptional regulation and protein homeostasis. Understanding how ant queens defy the trade-off between fecundity and lifespan remains a major challenge for the evolutionary theory of ageing. It has often been discussed that the low extrinsic mortality of ant queens, that are generally well protected within the nest by workers and soldiers, should reduce the selection shadow acting on old queens. We tested this by comparing strength of selection acting on genes upregulated in young and old queens of the ant, Cardiocondyla obscurior. In support of a reduced selection shadow, we find old-biased genes to be under strong purifying selection. We also analyzed a gene coexpression network (GCN) with the aim to detect signs of ageing in the form of deteriorating regulation and proteostasis. We find no evidence for ageing. In fact, we detect higher connectivity in old queens indicating increased transcriptional regulation with age. Within the GCN, we discover five highly correlated modules that are upregulated with age. These old-biased modules regulate several antiageing mechanisms such as maintenance of proteostasis, transcriptional regulation, and stress response. We observe stronger purifying selection on central hub genes of these old-biased modules compared with young-biased modules. These results indicate a lack of transcriptional ageing in old C. obscurior queens, possibly facilitated by strong selection at old age and well-regulated antiageing mechanisms.

Keywords

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MeSH Term

Animals
Ants
Biological Evolution
Female
Gene Expression Regulation, Developmental
Gene Regulatory Networks
Longevity
Selection, Genetic

Word Cloud

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