In the subcuticular tissue a number of genes involved in fatty acid metabolism, fatty acid elongation, amino acid degradation (mainly
valine, leucine, isoleucine, lysine and tyrosine), acetyl CoA synthesis, and the citrate cycle, are upregulated. Also, the previously characterized genes encoding the yolk related proteins LsVit1, LsVit2 and LsYAP are upregulated in accordance with previous reports Dactolisib purchase by Dalvin and colleagues (Dalvin et al., 2011 and Dalvin et al., 2009). A peroxidase annotated as a chorion peroxidase, but with high similarity to thyroid peroxidase involved in the production of thyroid hormone that regulates metabolism in vertebrates and also may affect metabolism in invertebrates (Chaudhuri and Medda, 1987 and Heyland and Moroz, 2005), is
also upregulated. When comparing different tissues to find the differentially expressed genes (DEGs) and pathways that seem to define each tissue, one must keep in mind that the results are dependent on other tissues that are included in the analysis. We saw that the heterogeneity of cell types in the frontal tissue caused a decrease in the number of DEGs found in the subcuticular tissue. For example, when the number of DEGs between the subcuticular tissue and the other tissues increases from 324 to 2325 when the brain tissue Sirolimus purchase is excluded (Table 1). To a certain degree, this is probably also the case for the other comparisons where two tissues perform similar biological tasks. For example, we do see that the pathways of ovary and testis have a number of upregulated pathways
in common, but it is likely that a number of other metabolic processes would also show up as upregulated in testis if ovary had not been included in the analysis, and vice versa. Gene expression in the ovary and the testis are characterized by genes involved in protein synthesis, cell replication and meiosis in accordance with the expected role of the two tissues in the production of ova and sperm. The salmon louse is a long lived parasite and production of eggs is continuous throughout the adult stage (Williams and Stanley, 2011). It is therefore necessary to maintain a continuous production of ova. A similar need can be expected for the production of spermatophores. Analysis of egg-strings from females shows that eggs are commonly fertilized by several males Suplatast tosilate (Hamre et al., 2009), which must be a result of several mating events. N-glycan production was upregulated in ovaries. N-glycansare glycoproteins are thought to play an important role in the production of fertile eggs in the ovary (Williams and Stanley, 2011). The down-regulation of glycolysis in ovaries and down-regulation of amino acid metabolism in testis could indicate differential use of energy sources in the two tissues. The transcriptional profile of the frontal tissue was characterized by the heterogenocity tissues contained in the sample.
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