Unknown,Transcriptomics,Genomics,Proteomics

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RNAi profiling by array of human U-2-OS osteosarcoma cells with knockdown of Asf1a and Asf1b

ABSTRACT: We used RNAi to knock-down the two isoforms of Asf1, Asf1a and Asf1b, in human U-2-OS osteosarcoma cells. We obtained two replicates each with siRNAs against Asf1a, Asf1b, combined siRNAs against both isoforms, and two control samples. For these samples, we measured genome-wide transcription levels using Affymetrix HG-U133Plus2 oligonucleotide microarrays.

ORGANISM(S): Homo sapiens

SUBMITTER: Joern Toedling

PROVIDER: E-MEXP-2671 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Phenotypic plasticity, the ability of one genotype to express different phenotypes in response to changing environmental conditions, is one of the most common phenomena characterising the living world and is not only relevant for the ecology but also for the evolution of species. Daphnia, the waterflea, is a textbook example for predator induced phenotypic plastic defences including changes in life-history, behaviour and morphology. However, the analysis of molecular mechanisms underlying these inducible defences is still in its early stages. We exposed Daphnia magna to chemical cues of the predator Triops cancriformis to identify key processes underlying plastic defensive trait formation. D. magna is known to develop an array of morphological changes in the presence of T. cancriformis including changes of carapace morphology and cuticle hardening. To get a more comprehensive idea of this phenomenon, we studied four different genotypes originating from habitats with different predation history, reaching from predator-free to temporary habitats containing T. cancriformis. We analysed the morphologies as well as proteomes of predator-exposed and control animals. Three genotypes showed morphological changes when the predator was present. Using a high-throughput proteomics approach, we found 294 proteins which were significantly altered in their abundance after predator exposure in a general or genotype dependant manner. Proteins connected to genotype dependant responses were related to the cuticle, protein synthesis and calcium binding whereas the yolk protein vitellogenin increased in abundance in all genotypes, indicating their involvement in a more general response. Furthermore, genotype dependant responses at the proteome level correlated well with local adaptation to Triops predation. Altogether, our study provides new insights concerning genotype dependant and general molecular processes involved in predator-induced phenotypic plasticity in D. magna.

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RNAi profiling by array of human U-2-OS osteosarcoma cells with knockdown of Asf1a and Asf1b

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