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Evolution of phenotypic plasticity and transgenerational effects of heat stress in the nematode Caenorhabditis remanei

ABSTRACT: Analysis of evolved changes in transcriptional plasticity and parental effects on plasticity induced by mild heat stress in the nematode Caenorhabditis remanei. Results of this study highlight the importance of the broad environmental context of an organism and its influence on phenotypic plasticity, parental effects, and evolutionary responses.

ORGANISM(S): Caenorhabditis remanei

PROVIDER: GSE62841 | GEO | 2014/10/30

SECONDARY ACCESSION(S): PRJNA265823

REPOSITORIES: GEO

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Evolution of phenotypic plasticity and transgenerational effects of heat stress in the nematode Caenorhabditis remanei

Project description:Analysis of evolved changes in transcriptional plasticity and parental effects on plasticity induced by mild heat stress in the nematode Caenorhabditis remanei. Results of this study highlight the importance of the broad environmental context of an organism and its influence on phenotypic plasticity, parental effects, and evolutionary responses. mRNA profiles of ancestral and two experimentally evolved populations of C. remanei. Parents of the sampled worms were raised at either 20Â°C or 30Â°C, then the resulting embryos were divided and reared at either 20Â°C or 30Â°C prior to collection (as L1 larvae). 6 replicates/larval temperature for each population if the parents were raised at 20Â°C, and 2 replicates/larval temperature for each population if the parents were raised at 30Â°C.

2014-10-30 | E-GEOD-62841 | biostudies-arrayexpress

Rapid evolution of phenotypic plasticity and shifting thresholds of genetic assimilation in the nematode Caenorhabditis remanei

Project description:Many organisms can acclimate to new environments through phenotypic plasticity, a complex trait that can be heritable, subject to selection, and evolve. However, the rate and genetic basis of plasticity evolution remain largely unknown. We experimentally evolved outbred populations of the nematode Caenorhabditis remanei under an acute heat shock during early larval development. When raised in a non-stressful environment, ancestral populations were highly sensitive to a 36.8Â°C heat shock and exhibited high mortality. However, initial exposure to a non-lethal high temperature environment resulted in significantly reduced mortality during heat shock (hormesis). Lines selected for heat shock resistance rapidly evolved the capacity to withstand heat shock in the native environment without any initial exposure to high temperatures, and early exposure to high temperatures did not lead to further increases in heat resistance. This loss of plasticity would appear to have resulted from the genetic assimilation of the heat induction response in the non-inducing environment. However, analyses of transcriptional variation via RNA-sequencing from the selected populations revealed no global changes in gene regulation correlated with the observed changes in heat stress resistance. Instead, assays of the phenotypic response across a broader range of temperatures revealed that the induced plasticity was not fixed across environments, but rather the threshold for the response was shifted to higher temperatures over evolutionary time. These results demonstrate that apparent genetic assimilation can result from shifting thresholds of induction across environments and that analysis of the broader environmental context is critically important for understanding the evolution of phenotypic plasticity. mRNA profiles of ancestral and two experimentally evolved populations of C. remanei at 20Â°C or 30Â°C, 6 replicates/temperature for each population

2014-05-04 | E-GEOD-56510 | biostudies-arrayexpress

Rapid evolution of phenotypic plasticity and shifting thresholds of genetic assimilation in the nematode Caenorhabditis remanei

Project description:Many organisms can acclimate to new environments through phenotypic plasticity, a complex trait that can be heritable, subject to selection, and evolve. However, the rate and genetic basis of plasticity evolution remain largely unknown. We experimentally evolved outbred populations of the nematode Caenorhabditis remanei under an acute heat shock during early larval development. When raised in a non-stressful environment, ancestral populations were highly sensitive to a 36.8°C heat shock and exhibited high mortality. However, initial exposure to a non-lethal high temperature environment resulted in significantly reduced mortality during heat shock (hormesis). Lines selected for heat shock resistance rapidly evolved the capacity to withstand heat shock in the native environment without any initial exposure to high temperatures, and early exposure to high temperatures did not lead to further increases in heat resistance. This loss of plasticity would appear to have resulted from the genetic assimilation of the heat induction response in the non-inducing environment. However, analyses of transcriptional variation via RNA-sequencing from the selected populations revealed no global changes in gene regulation correlated with the observed changes in heat stress resistance. Instead, assays of the phenotypic response across a broader range of temperatures revealed that the induced plasticity was not fixed across environments, but rather the threshold for the response was shifted to higher temperatures over evolutionary time. These results demonstrate that apparent genetic assimilation can result from shifting thresholds of induction across environments and that analysis of the broader environmental context is critically important for understanding the evolution of phenotypic plasticity.

2014-05-04 | GSE56510 | GEO

Environmental and evolutionary drivers of the modular gene regulatory network underlying phenotypic plasticity for stress resistance in the nematode Caenorhabditis remanei

Project description:In response to changing environmental conditions, organisms can acclimate through phenotypic plasticity or adapt by evolving mechanisms to cope with novel stressors. Changes in gene expression, whether dynamic or evolved, are an important way in which environmental responses are mediated; however, much is still unknown about how the molecular networks underlying plastic phenotypes evolve. Here, we compare transcriptional responses to acute heat stress among four populations of the nematode Caenorhabditis remanei-one selected to withstand heat stress, one selected under oxidative stress, an unselected control, and the ancestral population. We used a weighted gene coexpression network analysis within these lines to identify transcriptional modules, which are sets of genes that respond similarly to stress via plastic responses, evolutionary responses, or both. The transcriptional response to acute heat stress is dominated by a plastic response that is shared in the ancestor and all evolved populations. However, we also identified several modules that respond to artificial selection by (1) changing the baseline level of expression, (2) altering the magnitude of the plastic response, or (3) a combination of the two. Our findings reveal that while it is possible to perturb the nature of the transcriptional response network with short bouts of intense selection, the overall structure of transcriptional plasticity is dominated by inherent, ancestral regulatory systems.

2019-02-04 | GSE115496 | GEO

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Project description:Caenorhabditis remanei

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Dissecting the genetic basis of an evolved acute heat stress and oxidative stress resistance in the nematode Caenorhabditis remanei reveals a complex and unique genetic architecture

Project description:Analysis of constitutive changes in gene expression patterns in populations of the nematode Caenorhabditis remanei experimentally evolved to either acute heat stress, acute oxidative stress or the lab environment. Results of this study demonstrate that acute heat stress and acute oxidative stress are complex traits with a unique genetic basis. Overall design: Pooled population RNA sequencing libraries were obtained from the ancestor population and three evolved populations: one biological replicate of the control selected population, one heat stress selected population and one oxidative stress selected population per replicate. Tissue was collected from populations of L1 larval worms.

2017-12-19 | GSE108235 | GEO

Caenorhabditis remanei

Project description:Rapid evolution of phenotypic plasticity and shifting thresholds of genetic assimilation in the nematode Caenorhabditis remanei

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Environmental and evolutionary drivers of the modular gene regulatory network underlying phenotypic plasticity for stress resistance in the nematode Caenorhabditis remanei

Project description:Environmental and evolutionary drivers of the modular gene regulatory network underlying phenotypic plasticity for stress resistance in the nematode Caenorhabditis remanei

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Bio-electrospraying the nematode Caenorhabditis elegans

Project description:Bio-electrospray, the direct jet-based cell handling apporach, is able to handle a wide range of cells. Studies at the genomic, genetic, and the physiological level have shown that, post-treatment, cellular integrity is unperturbed and a high percentage (>70%, compared to control) of cells remain viable. Although, these results are impressive, it may be argued that cell based systems are oversimplistic. This study utilizing a well characterised multicellular model organism, the non-parasitic nematode Caenorhabditis elegans. Nematodes were subjected to bio-electrosprays to demonstrate that bio-electrosprays can be safely applied to nematodes.

2009-07-02 | GSE16915 | GEO

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