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Bulk gene expression profiles of adult and pupal antennae in wild-type and orco mutant Harpegnathos saltator

ABSTRACT: This SuperSeries is composed of the SubSeries listed below.

ORGANISM(S): Harpegnathos saltator

PROVIDER: GSE236793 | GEO | 2024/05/02

REPOSITORIES: GEO

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Bulk gene expression profiles of pupal antennae in wild-type and orco mutant Harpegnathos saltator

Project description:H. saltator orco mutant has a reduced number of cells in the antennae. We performed RNA-seq of the developing pupal antennae to describe the developmental context of cell death in the mutant pupae.

2024-05-02 | GSE236792 | GEO

Bulk gene expression profiles of adult antennae in wild-type and orco mutant Harpegnathos saltator

Project description:H. saltator orco mutant has a reduced number of cells in the antennae. We performed RNA-seq of the antennae and compared the mutant to the wild type to identify any differentially expressed odorant receptor genes.

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Bulk gene expression profiles of pupal antennae in wild-type and orco mutant Harpegnathos saltator

Project description:Bulk gene expression profiles of pupal antennae in wild-type and orco mutant Harpegnathos saltator

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Bulk gene expression profiles of adult and pupal antennae in wild-type and orco mutant Harpegnathos saltator

Project description:Bulk gene expression profiles of adult and pupal antennae in wild-type and orco mutant Harpegnathos saltator

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Bulk gene expression profiles of adult antennae in wild-type and orco mutant Harpegnathos saltator

Project description:Bulk gene expression profiles of adult antennae in wild-type and orco mutant Harpegnathos saltator

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Gene expression profiles at the single-nucleus level of the antennae of wild-type and orco mutant Harpegnathos saltator

Project description:H. saltator orco mutant has a reduced number of cells in the antennae. We performed single-nucleus sequencing of the antennae and compared the mutant to the wild type to identify any differentially abundant cell types.

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Gene expression profiles at the single-nucleus level of the antennae of wild-type and orco mutant Harpegnathos saltator

Project description:Gene expression profiles at the single-nucleus level of the antennae of wild-type and orco mutant Harpegnathos saltator

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Genomic comparison of the ants Camponotus floridanus and Harpegnathos saltator.

Project description:The organized societies of ants include short-lived worker castes displaying specialized behavior and morphology and long-lived queens dedicated to reproduction. We sequenced and compared the genomes of two socially divergent ant species: Camponotus floridanus and Harpegnathos saltator. Both genomes contained high amounts of CpG, despite the presence of DNA methylation, which in non-Hymenoptera correlates with CpG depletion. Comparison of gene expression in different castes identified up-regulation of telomerase and sirtuin deacetylases in longer-lived H. saltator reproductives, caste-specific expression of microRNAs and SMYD histone methyltransferases, and differential regulation of genes implicated in neuronal function and chemical communication. Our findings provide clues on the molecular differences between castes in these two ants and establish a new experimental model to study epigenetics in aging and behavior.

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Chemosensory sensitivity reflects reproductive status in the ant Harpegnathos saltator.

Project description:Insects communicate with pheromones using sensitive antennal sensilla. Although trace amounts of pheromones can be detected by many insects, context-dependent increased costs of high sensitivity might lead to plasticity in sensillum responsiveness. We have functionally characterized basiconic sensilla of the ant Harpegnathos saltator for responses to general odors in comparison to cuticular hydrocarbons which can act as fertility signals emitted by the principal reproductive(s) of a colony to inhibit reproduction by worker colony members. When released from inhibition workers may become reproductive gamergates. We observed plasticity in olfactory sensitivity after transition to reproductive status with significant reductions in electrophysiological responses to several long-chained cuticular hydrocarbons. Although gamergates lived on average five times longer than non-reproductive workers, the shift to reproductive status rather than age differences matched the pattern of changes in olfactory sensitivity. Decreasing sensillum responsiveness to cuticular hydrocarbons could potentially reduce mutually inhibitory or self-inhibitory effects on gamergate reproduction.

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Project description:In comparison to the large amount of study on the communication abilities of females in ant societies and their associated chemical ecology and sensory physiology, such study of male ants has been largely ignored; accordingly, little is known about their olfactory sensory capabilities. To address this, we explored peripheral odor sensitivities in male Harpegnathos saltator by measuring the electrophysiological activity of olfactory sensory neurons within antennal trichoid and coeloconic sensilla using an extracellular recording technique. In an initial trial of 46 compounds, sensilla trichodea responded strongly to two alarm pheromone components, while a limited number of non-hydrocarbon odorants elicited strong responses in sensilla coeloconica. Both sensillar types responded indifferently to 31 cuticular hydrocarbons (CHCs) and synthetic long-chain hydrocarbons (HCs) typically found on insect cuticle. In a search for sensilla responding to CHCs and other compounds, we found some sensilla that responded to synthetic HCs and CHCs from virgin queen postpharyngeal glands that are potentially used in close range mate recognition. Olfactometer bioassays of male ants to 15 non-HCs correlated sensory responsiveness to the respective behavioral responses. Comparing olfactory responses between H. saltator males and females, we found that sensilla coeloconica and basiconica of workers showed greater responses and broader selectivity to all compounds. The rarity of CHC-responding trichoid sensilla in Harpegnathos males suggests a more specific role in sexual communication compared to that in females, which use CHCs in a broader communication context.

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