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Gene regulatory network architecture in different developmental contexts influences the genetic basis of morphological evolution

ABSTRACT: Gene regulatory network architecture in different developmental contexts influences the genetic basis of morphological evolution

OTHER RELATED OMICS DATASETS IN: EGAD00001001300

PROVIDER: PRJNA450538 | ENA |

REPOSITORIES: ENA

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Gene regulatory network architecture in different developmental contexts influences the genetic basis of morphological evolution

Project description:Convergent phenotypic evolution is often caused by recurrent changes at particular nodes in the underlying gene regulatory networks (GRNs). The genes at such evolutionary 'hotspots' are thought to maximally affect the phenotype with minimal pleiotropic consequences. This has led to the suggestion that if a GRN is understood in sufficient detail, the path of evolution may be predictable. The repeated evolutionary loss of larval trichomes among Drosophila species is caused by the loss of shavenbaby (svb) expression. svb is also required for development of leg trichomes, but the evolutionary gain of trichomes in the 'naked valley' on T2 femurs in Drosophila melanogaster is caused by the loss of microRNA-92a (miR-92a) expression rather than changes in svb. We used RNAseq of second (T2) pupal legs (20-28 h after puparium formation) to compare the expression of trichome GRN genes between strains with a large and a small naked valley. We also compared the function of components between the larval and leg trichome GRNs to investigate why the genetic basis of trichome pattern evolution differs in these developmental contexts. Moreover, we used ATAC-seq of second (T2) pupal legs (20-28 h after puparium formation) to identify the pupal leg enhancers of svb. We found key differences between the two networks in both the genes employed, and in the regulation and function of common genes. These differences in the GRNs reveal why mutations in svb are unlikely to contribute to leg trichome evolution and how instead miR-92a represents the key evolutionary switch in this context. Our work shows that variability in GRNs across different developmental contexts, as well as whether a morphological feature is lost versus gained, influence the nodes at which a GRN evolves to cause morphological change. Therefore, our findings have important implications for understanding the pathways and predictability of evolution.

2018-04-18 | GSE113240 | GEO

Gene regulatory network architecture in different developmental contexts influences the genetic basis of morphological evolution.

Project description: Not available

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Project description:Individual differences in behaviour are often consistent across time and contexts, but it is not clear if such consistency is reflected at the molecular level. We explored this issue by studying scouting in honey bees in two different behavioural and ecological contexts: finding new sources of floral food resources and finding a new nest site. Brain gene expression profiles in food-source and nest-site scouts showed a mixture of similarities and differences. Class prediction and 'leave-one-out' cross-validation analyses revealed that a bees role as a scout in either context could be predicted with 92.5% success using 89 genes at minimum. We also found that genes related to four neurotransmitter systems were part of a shared brain molecular signature in both types of scouts, but the two types of scouts were more similar for genes related to glutamate and GABA and more divergent for genes related to monoamines and acetylcholine signaling. These results indicate that consistent behavioural tendencies across different ecological contexts involve a mixture of similarities and differences in brain gene expression.

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