Project description:Color is an important trait in nature, playing a role in selection and speciation. The most important colorants in crustaceans are carotenoids, which in complexes with carotenoid-binding proteins provide an astonishing variety of colors from red to violet. Over 350 species and subspecies of amphipods (Crustacea: Amphipoda) endemic to Lake Baikal exhibit an impressive variability of colors and coloration patterns. However, the mechanisms forming this diversity are underexplored. In this work, we analyze the coloration of two species of endemic Lake Baikal amphipods, Eulimnogammarus cyaneus and E. vittatus. These species are brightly colored and, even more importantly, characterized by intraspecific color variability. We showed that the color of either species strongly correlated with the abundance of two putative carotenoid-binding proteins (the relative abundance of these proteins was higher in blue or teal-colored animals than in the orange- or yellow-colored ones.). With LC-MS/MS, we were able to identifiy these proteins, which turned out to be similar to the pheromone/odorant-binding protein family.
2020-06-04 | PXD018516 | Pride
Project description:Functional metagenomic insights into a freshwater lake Mgobezeleni affected by harmful cyanobacterial bloom
| PRJNA509663 | ENA
Project description:Functional metagenomic insights into a freshwater lake Mgobezeleni affected by harmful cyanobacterial bloom
Project description:Cyanobacteria frequently constitute integral components of microbial communities known as phototrophic biofilms, which are widespread in various environments and hold significant industrial relevance. Previous studies of the model cyanobacterium Synechococcus elongatus PCC 7942 revealed that its planktonic growth habit results from a biofilm-suppression mechanism that depends on an extracellular inhibitor, an observation that opens the door to investigating cyanobacterial intercellular communication. Here, we demonstrate that the RNA polymerase sigma factor SigF1, is required for this biofilm-suppression mechanism and suggest that sigF1-inactivation impairs secretion of the biofilm inhibitor. The S. elongatus paralog SigF2, however, is not involved in biofilm regulation. Comprehensive transcriptome analyses identified distinct regulons under the control of each of these sigma factors. Additional data indicate that SigF1 regulates biofilm through its involvement in transcriptional induction of genes that include those for the primary pilus subunit: sigF1 inactivation both prevents pilus assembly and abrogates secretion of the biofilm inhibitor. Consequently, expression is significantly upregulated for the ebfG-operon that encodes matrix components and the genes that encode the corresponding secretion system. Thus, this study uncovers a basic regulatory component of cyanobacterial intercellular communication, a field that is in its infancy. Elevated expression of biofilm-promoting genes in a sigF1 mutant supports an additional layer of regulation by SigF1 that operates via an intracellular mechanism.
2024-09-13 | GSE254350 | GEO
Project description:Surface Diatom Sediments of Deep Freshwater Lake Baikal
| PRJNA419998 | ENA
Project description:Study of viral diversity in Lake Baikal
Project description:The goal of this project was to determine gene expression changes in the liver at different times post treatment with the common freshwater cyanobacterial toxin, cylindrospermopsin (CYN). The liver is generally considered to be the primary target of this toxin and all the data has been derived from livers of exposed animals as well as concurrent controls. Preliminary gene expression effects have been reported (Chernoff et al., 2010) and the current data extend the time course from 1 hour post exposure to 1-day post cessation of a 5-day period dosing period. Gene expression changes were determined in the livers of pregnant mice exposed to toxic levels of cyanobacterial toxin, cylindrospermopsin. Animals were exposed to a dose of CYN that elicited significant hepatic toxicity. This single dose study analyzed liver samples collected at 1, 3, 6, 12 and 24 hours post dose. Gene expression changes were analyzed on the Illumina MouserRef-8v2.0 expression beadchip.
Project description:The goal of this project was to determine gene expression changes in the liver at different times post treatment with the common freshwater cyanobacterial toxin, cylindrospermopsin (CYN). The liver is generally considered to be the primary target of this toxin and all the data has been derived from livers of exposed animals as well as concurrent controls. Preliminary gene expression effects have been reported (Chernoff et al., 2010) and the current data extend the time course from 1 hour post exposure to 1-day post cessation of a 5-day period dosing period. Gene expression changes were determined in the livers of pregnant mice exposed to toxic levels of cyanobacterial toxin, cylindrospermopsin. Animals were exposed to a dose of CYN that elicited significant hepatic toxicity. This single dose study analyzed liver samples collected at 1, 3, 6, 12 and 24 hours post dose. Gene expression changes were analyzed on the GeneChip® Mouse Genome 430 2.0 Array.
Project description:Transcripts of the gill epithelium from three different stocks of Atlantic salmon (Salmo salar) migrating from freshwater river to lake (Saimaa stock, SS), brackish water (Neva stock, NS) or seawater (Teno stock, TS) were compared at three successive developmental stages (parr, smolt and postsmolt) using the 16K GRASP cDNA microarray platform.
