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Ontology highlight
ABSTRACT:
PROVIDER: PRJEB20730 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| ERR1957080_1.fastq.gz | Fastqsanger.gz | |||
| ERR1957080_2.fastq.gz | Fastqsanger.gz | |||
| ERR1957081_1.fastq.gz | Fastqsanger.gz | |||
| ERR1957081_2.fastq.gz | Fastqsanger.gz | |||
| ERR1957079_1.fastq.gz | Fastqsanger.gz |
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Project description:The X chromosome has a large effect on hybrid dysfunction, particularly hybrid male sterility. Although the evidence for this so-called large-X effect is clear, its molecular causes are not yet fully understood. One possibility is that, under certain conditions, evolution proceeds faster in X-linked loci than in their autosomal counterparts due to both natural selection and their hemizygosity in males (i.e. Faster-X effect), an effect that is expected to be greatest in genes with male-biased expression. Here I studied variation in transcript abundance within and between species in Drosophila yakuba, D. santomea and their hybrid males to evaluate both the faster-X and large-X effects at the level of genome-wide gene expression. I found that expression in X-linked male-biased genes evolves faster than in their autosomal counterparts, an effect that is accompanied by a unique reduction in gene expression polymorphism. Although we do not know the precise relationship between nucleotide and gene expression changes, elevated divergence to polymorphism ratios are consistent with Darwinian selection driving expression differences between species in X-linked male-biased genes, likely enhanced by male hemizygosity. Abundant changes in both cis- and trans-regulatory elements underlie regulatory gene expression divergence in the majority of the genes analyzed despite the recent split of the two sister species. I detected a large-X effect on regulation of expression in hybrid males, affecting mostly male-biased genes but also, to a lesser degree, nonsex-biased genes. Interestingly this misexpression is concentrated mostly in autosomal genes, likely facilitated by the rapid evolution of sex-linked trans-acting factors. I conclude that the faster evolution of X-linked male-biased genes, at both protein and expression levels, can contribute to explain the large effect of the X chromosome on hybrid male sterility, possibly mediating autosomal misexpression through cis-trans interactions.
2012-09-05 | GSE38793 | GEO
Project description:In most aphid species, facultative parthenogenetic reproduction allows rapid growth and formation of large single-genotype colonies. Upon predator attack, individual aphids emit an alarm pheromone to warn the colony of this danger. (E)-beta-farnesene (EBF) is the predominant constituent of the alarm pheromone in Myzus persicae (green peach aphid) and many other aphid species. Continuous exposure to alarm pheromone in aphid colonies raised on transgenic Arabidopsis thaliana plants that produce EBF leads to habituation of the aphid population. Whereas naïve aphids are repelled by EBF, habituated aphids show no avoidance response. Individual aphids from the habituated colony can revert back to being EBF-sensitive in three generations, indicating that this behavioral change is not caused by a genetic mutation. Instead, DNA microarray experiments comparing gene expression in naïve and habituated aphids treated with EBF demonstrate an almost complete desensitization in the transcriptional response to EBF. Furthermore, EBF-responsive aphids, but not habituated aphids show significantly lower reproduction in the presence of EBF. Although both naïve and habituated aphids emit EBF upon damage, EBF-responsive aphids display a higher survival rate in the presence of coccinellid predators and thus outperform habituated aphids that do not show an avoidance response. These results provide direct evidence that aphid perception of conspecific alarm pheromone aids in predator avoidance and thereby bestows fitness benefits in survivorship and fecundity. Although habituated M. persicae have equal fecundity on control and EBF-producing plants, such transgenics may have practical applications in agriculture because of increased predation of habituated aphids. Log fold-changes (LogFC) were computed and contigs with P-values ≤ 0.05 were considered to be differentially expressed (see Supplementary file at foot of this record).
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Project description:Soybean aphids are phloem-feeding pests that can cause significant yield losses in soybean plants. Soybean aphids thrive on susceptible soybean lines but not on resistant lines. Aphids do not normally kill their host and colonize plants for long periods of time, up to several months in soybean. However, our knowledge of plant responses to long-term aphid colonization is very limited. We used microarrays to characterize the soybean plant's transcriptional response against aphids in two related cultivars, a susceptible line and a resistant line with the Rag1 aphid-resistance gene. We measured transcript levels in leaves after 21 days of aphid infestation.
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Project description:Soybean aphids are phloem-feeding pests that can cause significant yield losses in soybean plants. Soybean aphids thrive on susceptible soybean lines but not on resistant lines. We used microarrays to characterize the soybean plant's transcriptional defense against aphids in two related cultivars, a susceptible line and a resistant line with the Rag1 aphid-resistance gene. We measured trancript levels in leaves after one and seven days of aphid infestation.
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2018-10-10 | E-MTAB-5228 | biostudies-arrayexpress
Project description:In most aphid species, facultative parthenogenetic reproduction allows rapid growth and formation of large single-genotype colonies. Upon predator attack, individual aphids emit an alarm pheromone to warn the colony of this danger. (E)-beta-farnesene (EBF) is the predominant constituent of the alarm pheromone in Myzus persicae (green peach aphid) and many other aphid species. Continuous exposure to alarm pheromone in aphid colonies raised on transgenic Arabidopsis thaliana plants that produce EBF leads to habituation of the aphid population. Whereas naïve aphids are repelled by EBF, habituated aphids show no avoidance response. Individual aphids from the habituated colony can revert back to being EBF-sensitive in three generations, indicating that this behavioral change is not caused by a genetic mutation. Instead, DNA microarray experiments comparing gene expression in naïve and habituated aphids treated with EBF demonstrate an almost complete desensitization in the transcriptional response to EBF. Furthermore, EBF-responsive aphids, but not habituated aphids show significantly lower reproduction in the presence of EBF. Although both naïve and habituated aphids emit EBF upon damage, EBF-responsive aphids display a higher survival rate in the presence of coccinellid predators and thus outperform habituated aphids that do not show an avoidance response. These results provide direct evidence that aphid perception of conspecific alarm pheromone aids in predator avoidance and thereby bestows fitness benefits in survivorship and fecundity. Although habituated M. persicae have equal fecundity on control and EBF-producing plants, such transgenics may have practical applications in agriculture because of increased predation of habituated aphids. Log fold-changes (LogFC) were computed and contigs with P-values ≤ 0.05 were considered to be differentially expressed (see Supplementary file at foot of this record). Agilent 8x15K array previously reported by Ramsey et al., 2007 - BMC Genomics 8: 243. Two-condition experiment using Alexa Fluor 555 and 647 dyes. Biological replicates: 4 control replicates, 4 treated replicates.
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