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Worker antennal gene expression in Solenopsis invicta identifies candidate genes for queen discrimination

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

ORGANISM(S): Solenopsis invicta

PROVIDER: GSE126684 | GEO | 2020/04/10

REPOSITORIES: GEO

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Worker antennal gene expression in Solenopsis invicta identifies candidate genes for queen discrimination (Clontech_lib_RNA-seq)

Project description:Queen discrimination behavior in the red imported fire ant Solenopsis invicta maintains its two types of societies: colonies with one (monogyne) or many (polygyne) queens, yet the underlying genetic mechanism is poorly understood. This behavior is controlled by two supergene alleles, SB and Sb, with ~600 genes. Polygyne workers, having either the SB/SB or SB/Sb genotype, accept additional SB/Sb queens into their colonies but kill SB/SB queens. While monogyne workers, all SB/SB, reject all additional queens regardless of genotype. Because the SB and Sb alleles do not recombine, it is difficult to determine which genes within the supergene mediate this differential worker behavior. We hypothesized that the alternate worker genotypes sense queens differently because of different patterns of gene expression in their main sensory organ, the antennae. To identify such differentially expressed genes, we sequenced RNA from four biological replicates of pooled antennae from three groups of workers: monogyne SB/SB, polygyne SB/SB, and polygyne SB/Sb. We identified 81 differentially expressed protein coding genes with 14 encoding potential odor metabolism and perception proteins. We focused on the two differentially expressed odorant perception genes: an odorant binding protein SiOBP12 and an odorant receptor SiOR463. We found that the SiOR463 was lost in the Sb-genome. In contrast, the SiOBP12 has an Sb-specific duplication SiOBP12b’, which was expressed in the SB/Sb worker antennae, while both paralogs SiOBP12 and SiOBP12b’ were expressed in the body. This result indicates that SiOBP12b’ has gained an antennal promoter or enhancer and suggests neofunctionalization, perhaps for queen discrimination behavior.

2020-04-10 | GSE126673 | GEO

Worker antennal gene expression in Solenopsis invicta identifies candidate genes for queen discrimination (Nugen_lib_RNA-seq-1)

2020-04-10 | GSE126368 | GEO

Worker antennal gene expression in Solenopsis invicta identifies candidate genes for queen discrimination (Nugen_lib_RNA-seq-2)

2020-04-10 | GSE126674 | GEO

Worker antennal gene expression in Solenopsis invicta identifies candidate genes for queen discrimination

Project description:Worker antennal gene expression in Solenopsis invicta identifies candidate genes for queen discrimination

| PRJNA522987 | ENA

Worker antennal gene expression in Solenopsis invicta identifies candidate genes for queen discrimination (Clontech_lib_RNA-seq)

Project description:Worker antennal gene expression in Solenopsis invicta identifies candidate genes for queen discrimination (Clontech_lib_RNA-seq)

| PRJNA522913 | ENA

Worker antennal gene expression in Solenopsis invicta identifies candidate genes for queen discrimination (Nugen_lib_RNA-seq-1)

Project description:Worker antennal gene expression in Solenopsis invicta identifies candidate genes for queen discrimination (Nugen_lib_RNA-seq-1)

| PRJNA522069 | ENA

Worker antennal gene expression in Solenopsis invicta identifies candidate genes for queen discrimination (Nugen_lib_RNA-seq-2)

Project description:Worker antennal gene expression in Solenopsis invicta identifies candidate genes for queen discrimination (Nugen_lib_RNA-seq-2)

| PRJNA522912 | ENA

Antennal Proteome of the Solenopsis invicta (Hymenoptera: Formicidae): Caste Differences in Olfactory Receptors and Chemosensory Support Proteins.

Project description:Little is known about the expression pattern of odorant and pheromone transporters, receptors, and deactivation enzymes in the antennae of ants carrying out different tasks. In order to begin filling in this information gap, we compared the proteomes of the antennae of workers and males of the red fire ant, Solenopsis invicta Buren (Hymenoptera: Formicidae). Male ants do not perform any colony work, and their only activity is to leave the nest on a mating flight. Previous studies showed that male ants express fewer types of odorant receptors than workers. Thus, we expected to find large differences between male and worker antennae for expression of receptors, transporters, and deactivators of signaling chemicals. We found that the abundance of receptors was consistent with the expected caste-specific signaling complexity, but the numbers of different antenna-specific transporters and deactivating enzymes in males and workers were similar. It is possible that some of these proteins have antenna-specific functions that are unrelated to chemosensory reception. Alternatively, the similar complexity could be a vestige of ant progenitors that had more behaviorally active males. As the reduced behavior of male ants evolved, the selection process may have favored a complex repertoire of transporters and deactivating enzymes alongside a limited repertoire of odorant receptors.

| S-EPMC7585320 | biostudies-literature

Venom alkaloid and cuticular hydrocarbon profiles are associated with social organization, queen fertility status, and queen genotype in the fire ant Solenopsis invicta.

Project description:Queens in social insect colonies advertise their presence in the colony to: a) attract workers' attention and care; b) gain acceptance by workers as replacement or supplemental reproductives; c) prevent reproductive development in nestmates. We analyzed the chemical content of whole body surface extracts of adult queens of different developmental and reproductive stages, and of adult workers from monogyne (single colony queen) and polygyne (multiple colony queens) forms of the fire ant Solenopsis invicta. We found that the composition of the most abundant components, venom alkaloids, differed between queens and workers, as well as between reproductive and non-reproductive queens. Additionally, workers of the two forms could be distinguished by alkaloid composition. Finally, sexually mature, non-reproductive queens from polygyne colonies differed in their proportions of cis-piperidine alkaloids, depending on their Gp-9 genotype, although the difference disappeared once they became functional reproductives. Among the unsaturated cuticular hydrocarbons characteristic of queens, there were differences in amounts of alkenes/alkadienes between non-reproductive polygyne queens of different Gp-9 genotypes, between non-reproductive and reproductive queens, and between polygyne and monogyne reproductive queens, with the amounts increasing at a relatively higher rate through reproductive ontogeny in queens bearing the Gp-9 b allele. Given that the genotype-specific piperidine differences reflect differences in rates of reproductive maturation between queens, we speculate that these abundant and unique compounds have been co-opted to serve in fertility signaling, while the cuticular hydrocarbons now play a complementary role in regulation of social organization by signaling queen Gp-9 genotype.

| S-EPMC3800153 | biostudies-literature

Complete Genome Sequence of a New Isolate of Solenopsis invicta virus 3 from Solenopsis invicta × richteri Hybrid Ants.

Project description:Solenopsis invicta virus 3 (SINV-3) is a positive-sense, single-stranded RNA virus that infects the red imported fire ant, Solenopsis invicta Buren. We report here the full genome (10,383 nucleotides) of an isolate infecting Solenopsis invicta × richteri hybrid ants, which we have identified as SINV-3 hybrid.

| S-EPMC5722059 | biostudies-literature

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