DKK3 (dickkopf 3 homolog (Xenopus laevis))

Review on DKK3 (dickkopf 3 homolog (Xenopus laevis)), with data on DNA, on the protein encoded, and where the gene is implicated

Aktivitas Antiproliferatif Ekstrak Wasbensin Daun Eupatorium Riparium Reg. : Studi in Vitro Pada HeLa Cell Lin

Eupatorium riparium Reg. adalah tumbuhan obat penting asli dari Mexico dan India Barat, yang masuk ke tanah Jawa sejak tahun 1800. Tumbuhan ini mempunyai catatan sejarah digunakan untuk obat tradisional dalam berbagai kultur budaya bangsa secara luas di seluruh dunia dan biasa digunakan untuk obat hipertensi, gagal jantung, diuretik, antikanker, antifungi, dan penyakit yang disebabkan oleh bakteri. Studi pada HeLa cell line ini dilakukan selama satu bulan. Selanjutnya, studi ini bertujuan meneliti aktivitas antiproliferatif ekstrak wasbensin daun E. riparium terhadap kanker servik manusia Hela cell line. Aktivitas antiproliferatif diuji menggunakan reagen proliferatif sel WST-1 dengan waktu 1, 2, dan 4 jam setelah diinkubasi selama 72 jam pada suhu 37oC dan 5%CO2. Hasil penelitian menunjukkan bahwa ekstrak wasbensin daun E. riparium mempunyai aktivitas proliferatif yang potensial terhadap HeLa cell line dengan nilai IC50 berikut 102.69 ðœ‡g/ml (1 jam), 198.67 ðœ‡g/ml (2 jam). Saran selanjutnya, penelitian lanjutan perlu dilakukan untuk mengetahui mekanisme antikanker HeLa cell line

RNA Is an Integral Component of Chromatin that Contributes to Its Structural Organization

Chromatin structure is influenced by multiples factors, such as pH, temperature, nature and concentration of counterions, post-translational modifications of histones and binding of structural non-histone proteins. RNA is also known to contribute to the regulation of chromatin structure as chromatin-induced gene silencing was shown to depend on the RNAi machinery in S. pombe, plants and Drosophila. Moreover, both in Drosophila and mammals, dosage compensation requires the contribution of specific non-coding RNAs. However, whether RNA itself plays a direct structural role in chromatin is not known. Here, we report results that indicate a general structural role for RNA in eukaryotic chromatin. RNA is found associated to purified chromatin prepared from chicken liver, or cultured Drosophila S2 cells, and treatment with RNase A alters the structural properties of chromatin. Our results indicate that chromatin-associated RNAs, which account for 2%–5% of total chromatin-associated nucleic acids, are polyA− and show a size similar to that of the DNA contained in the corresponding chromatin fragments. Chromatin-associated RNA(s) are not likely to correspond to nascent transcripts as they are also found bound to chromatin when cells are treated with α-amanitin. After treatment with RNase A, chromatin fragments of molecular weight >3.000 bp of DNA showed reduced sedimentation through sucrose gradients and increased sensitivity to micrococcal nuclease digestion. This structural transition, which is observed both at euchromatic and heterochromatic regions, proceeds without loss of histone H1 or any significant change in core-histone composition and integrity

Genomic resolution of linkages in carbon, nitrogen, and sulfur cycling among widespread estuary sediment bacteria

Abstract Background Estuaries are among the most productive habitats on the planet. Bacteria in estuary sediments control the turnover of organic carbon and the cycling of nitrogen and sulfur. These communities are complex and primarily made up of uncultured lineages, thus little is known about how ecological and metabolic processes are partitioned in sediments. Results De novo assembly and binning resulted in the reconstruction of 82 bacterial genomes from different redox regimes of estuary sediments. These genomes belong to 23 bacterial groups, including uncultured candidate phyla (for example, KSB1, TA06, and KD3-62) and three newly described phyla (White Oak River (WOR)-1, WOR-2, and WOR-3). The uncultured phyla are generally most abundant in the sulfate-methane transition (SMTZ) and methane-rich zones, and genomic data predict that they mediate essential biogeochemical processes of the estuarine environment, including organic carbon degradation and fermentation. Among the most abundant organisms in the sulfate-rich layer are novel Gammaproteobacteria that have genes for the oxidation of sulfur and the reduction of nitrate and nitrite. Interestingly, the terminal steps of denitrification (NO3 to N2O and then N2O to N2) are present in distinct bacterial populations. Conclusions This dataset extends our knowledge of the metabolic potential of several uncultured phyla. Within the sediments, there is redundancy in the genomic potential in different lineages, often distinct phyla, for essential biogeochemical processes. We were able to chart the flow of carbon and nutrients through the multiple geochemical layers of bacterial processing and reveal potential ecological interactions within the communities.http://deepblue.lib.umich.edu/bitstream/2027.42/111044/1/40168_2015_Article_77.pd