Gene expression data from mouse salivary glands (wild type and Nfkbiz-deficient mice)
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ABSTRACT:
PROVIDER: PRJNA635014 | ENA |
REPOSITORIES: ENA
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Project description:We used microarrays to detail the global program of gene expression underlying identified distinct classes of up-regulated or down-regulated genes in salivary glands between Nfkbiz-/- and wild type mice.
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Project description:When misexpressed in late Drosophila prepupae, the transcription factor Fork head (Fkh) blocks death of the larval salivary glands that normally occurs in the early pupa. The aim of the experiment was to identify genes responding to Fkh that might mediate the effect of the protein on cell death and other biological processes. Fkh was expressed in the line P[hs-Fkh111] from a heat-inducible transgene that encodes wild-type Fkh protein. Expression of Fkh was induced by incubating prepupae for 30 min in a 37 °C water bath, starting at 9.5 hours after puparium formation. Salivary glands were dissected at 14 hours after puparium formation and RNA isolated for microarray analysis with Affymetrix GeneChips. Control samples were obtained from w1118 animals treated the same way. The microarray analysis identified 55 genes annotated as functioning in apoptosis whose expression was at least 1.5-fold changed by Fkh. These genes include the death genes hid and reaper, which play a central role in the control of salivary gland death. Other groups of significantly enriched genes include genes functioning in autophagy, steroid-signaling pathways, salivary gland secretion, and phospholipid metabolism. In addition, the microarray data identify genes as responsive to Fkh that are known to be controlled by the FOXA counterparts of Fkh in vertebrates, indicating that target genes and biological processes controlled by Fkh are evolutionarily conserved. SUBMITTER_CITATION: Liu and Lehmann, 2008: Genes and biological processes controlled by the Drosophila FOXA orthologue Fork head. Insect Molecular Biology, 17, 91-101; link: http://www.blackwell-synergy.com/toc/imb/17/2) Experiment Overall Design: Experimental RNA samples were obtained in 3 biological replicates from fkh-expressing salivary glands (SG_Fkh_14APF_rep1, SG_Fkh_14APF_rep2, SG_Fkh_14APF_rep3) and compared to control samples obtained in two biological replicates from the salivary glands of w1118 control animals (SG_w1118(3)_14APF_rep1, SG_w1118(3)_14APF_rep2). All samples were compared using dChip and normalized to the same baseline array (median intensity 134).
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Project description:Although the salivary transcriptome of adult mosquitoes has been thoroughly described in several recent papers, very little information exists regarding the biological role of larval salivary glands in the Culicidae. We used whole-transcriptome Affymetrix® chips to compare the transcriptional profiles of Anopheles gambiae larval (L4) salivary glands and whole larvae. We identified a total of 277 transcripts as being significantly enriched in the salivary glands. Based on available annotation for the known or predicted protein sequences encoded by these transcripts, 41 were identified as corresponding to secreted proteins, 233 as corresponding to non-secreted (housekeeping) proteins, and 3 as encoding proteins of unknown function. Based on functional annotation of the putatively secreted gene products, we propose that larval salivary secretions have roles in nutrient digestion, detoxification, immunity, and mouthpart lubrication. Interestingly, several components of the larval saliva (e.g. apyrase and serine proteases) have also been reported to exist in adult female saliva, where they are though to help regulate a vertebrate hostâs immune response to bloodfeeding. In conclusion, our results suggest that the salivary glands are important components of both the digestive and immune systems of larval mosquitoes, and that their study might provide clues about the evolution of adaptations to bloodfeeding observed in adults. Experiment Overall Design: We attempted to identify transcripts that are both present and significantly enriched in the salivary glands (SG) of the 4th instar Anopheles gambiae larva. Transcripts were considered as present in the SG if the built-in Affymetrix detection call scored them as such in all three biological replicates of the experiment. Expression values (i.e. signal intensities) of transcripts from the salivary glands were compared to those of a matching group of whole 4th instar larvae using a t-test. Transcripts showing an expression value two-fold or higher (p < 0.01; false discovery rate=1%) in the SG as compared to whole larvae were considered to be significantly enriched.
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