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https://www.readbyqxmd.com/read/29192250/coupling-optogenetics-and-light-sheet-microscopy-a-method-to-study-wnt-signaling-during-embryogenesis
#1
Prameet Kaur, Timothy E Saunders, Nicholas S Tolwinski
Optogenetics allows precise, fast and reversible intervention in biological processes. Light-sheet microscopy allows observation of the full course of Drosophila embryonic development from egg to larva. Bringing the two approaches together allows unparalleled precision into the temporal regulation of signaling pathways and cellular processes in vivo. To develop this method, we investigated the regulation of canonical Wnt signaling during anterior-posterior patterning of the Drosophila embryonic epidermis. Cryptochrome 2 (CRY2) from Arabidopsis Thaliana was fused to mCherry fluorescent protein and Drosophila β-catenin to form an easy to visualize optogenetic switch...
November 30, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29188381/the-effect-of-wolbachia-on-diapause-fecundity-and-clock-gene-expression-in-trichogramma-brassicae-hymenoptera-trichogrammatidae
#2
Somayeh Rahimi-Kaldeh, Ahmad Ashouri, Alireza Bandani, Kenji Tomioka
The short day lengths of late summer in moderate regions are used to induce diapause in various insects. Many studies have shown the maternal effect of photoperiod on diapause induction of Trichogramma wasps, but there is no study to show the relationship between photoperiodic regimes and clock genes in these useful biological control agents. Here, we investigated the role of photoperiods on diapause, fecundity, and clock gene expression (clk, cyc, cry2, per, and timeout) in asexual and sexual Trichogramma brassicae as a model insect to find any differences between two strains...
November 2017: Development Genes and Evolution
https://www.readbyqxmd.com/read/29164122/changes-in-expression-of-the-clock-gene-in-obstructive-sleep-apnea-syndrome-patients-are-not-reverted-by-continuous-positive-airway-pressure-treatment
#3
Susana Moreira, Raquel Rodrigues, André B Barros, Nadja Pejanovic, Ana Neves-Costa, Dora Pedroso, Cláudia Pereira, Dina Fernandes, João Valença Rodrigues, Cristina Barbara, Luís Ferreira Moita
Purpose: Metabolic syndrome and cardiovascular disease are strongly associated with obstructive sleep apnea syndrome (OSAS), which causes substantial changes to normal circadian physiological functions, including metabolic pathways. Because core clock genes are known to be modulated by sleep/vigilance cycles, we asked whether the expression level of mRNA coding for clock genes is altered in non-treated OSAS patients and if it can be corrected by standard continuous positive airway pressure (CPAP) treatment...
2017: Frontiers in Medicine
https://www.readbyqxmd.com/read/29151886/optogenetic-regulation-of-artificial-microrna-improves-h2-production-in-green-alga-chlamydomonas-reinhardtii
#4
Yuting Wang, Xinqin Jiang, Changxing Hu, Ting Sun, Zhiyong Zeng, Xiaoqi Cai, Hui Li, Zhangli Hu
Background: Chlamydomonas reinhardtii is an ideal model organism not only for the study of basic metabolic processes in both plants and animals but also the production of biofuels including hydrogen. Transgenic analysis of C. reinhardtii is now well established and very convenient, but inducible exogenous gene expression systems remain under-studied. The most commonly used heat shock-inducible system has serious effects on algal cell growth and is difficult and costly to control in large-scale culture...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/29144171/circadian-gene-methylation-in-rotating-shift-nurses-a-cross-sectional-study
#5
Edyta Reszka, Edyta Wieczorek, Monika Przybek, Ewa Jabłońska, Paweł Kałużny, Agnieszka Bukowska-Damska, Shanbeh Zienolddiny, Beata Pepłońska
Investigating the methylation status of the circadian genes may contribute to a better understanding of the shift work-related circadian disruption in individuals exposed to artificial light at night. In the present study, we determined the methylation status of the circadian genes associated with a shift work pattern among nurses and midwives participating in a cross-sectional study in Lodz, Poland. Quantitative methylation polymerase chain reaction assays were used to assess promoter CpG methylation in PER1, PER2, PER3, CRY1, CRY2, BMAL1, CLOCK, and NPAS2 in genomic DNA from whole blood of 347 women having a rotating-shift work schedule and 363 women working days only...
November 16, 2017: Chronobiology International
https://www.readbyqxmd.com/read/29109286/circadian-clock-cryptochrome-proteins-regulate-autoimmunity
#6
Qi Cao, Xuan Zhao, Jingwen Bai, Sigal Gery, Haibo Sun, De-Chen Lin, Qi Chen, Zhengshan Chen, Lauren Mack, Henry Yang, Ruishu Deng, Xianping Shi, Ling-Wa Chong, Han Cho, Jianjun Xie, Quan-Zhen Li, Markus Müschen, Annette R Atkins, Christopher Liddle, Ruth T Yu, Serhan Alkan, Jonathan W Said, Ye Zheng, Michael Downes, Ronald M Evans, H Phillip Koeffler
The circadian system regulates numerous physiological processes including immune responses. Here, we show that mice deficient of the circadian clock genes Cry1 and Cry2 [Cry double knockout (DKO)] develop an autoimmune phenotype including high serum IgG concentrations, serum antinuclear antibodies, and precipitation of IgG, IgM, and complement 3 in glomeruli and massive infiltration of leukocytes into the lungs and kidneys. Flow cytometry of lymphoid organs revealed decreased pre-B cell numbers and a higher percentage of mature recirculating B cells in the bone marrow, as well as increased numbers of B2 B cells in the peritoneal cavity of Cry DKO mice...
November 21, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29106308/sleep-quality-and-methylation-status-of-core-circadian-rhythm-genes-among-nurses-and-midwives
#7
Agnieszka Bukowska-Damska, Edyta Reszka, Pawel Kaluzny, Edyta Wieczorek, Monika Przybek, Shanbeh Zienolddiny, Beata Peplonska
ABSTARCT Poor sleep quality or sleep restriction is associated with sleepiness and concentration problems. Moreover, chronic sleep restriction may affect metabolism, hormone secretion patterns and inflammatory responses. Limited recent reports suggest a potential link between sleep deprivation and epigenetic effects such as changes in DNA methylation profiles. The aim of the present study was to assess the potential association between poor sleep quality or sleep duration and the levels of 5-methylcytosine in the promoter regions of PER1, PER2, PER3, BMAL1, CLOCK, CRY1 CRY2 and NPAS2 genes, taking into account rotating night work and chronotype as potential confounders or modifiers...
2017: Chronobiology International
https://www.readbyqxmd.com/read/29100427/aberrant-rhythmic-expression-of-cryptochrome2-regulates-the-radiosensitivity-of-rat-gliomas
#8
Wang Fan, Li Caiyan, Zhu Ling, Zhao Jiayun
In this study, we investigated the role of the clock regulatory protein cryptochrome 2 (Cry2) in determining the radiosensitivity of C6 glioma cells in a rat model. We observed that Cry2 mRNA and protein levels showed aberrant rhythmic periodicity of 8 h in glioma tissues, compared to 24 h in normal brain tissue. Cry2 mRNA and protein levels did not respond to irradiation in normal tissues, but both were increased at the ZT4 (low Cry2) and ZT8 (high Cry2) time points in gliomas. Immunohistochemical staining of PCNA and TUNEL assays demonstrated that high Cry2 expression in glioma tissues was associated with increased cell proliferation and decreased apoptosis...
September 29, 2017: Oncotarget
https://www.readbyqxmd.com/read/29099767/the-first-cry2ac-type-protein-toxic-to-helicoverpa-armigera-cloning-and-overexpression-of-cry2ac7-gene-from-sbs-bt1-strain-of-bacillus-thuringiensis
#9
Faiza Saleem, Abdul Rauf Shakoori
The Cry (crystal) proteins from Bacillus thuringiensis are known to have toxicity against a variety of insects and have been exploited to control insect pests through transgenic plants and biopesticides. B. thuringiensis SBS BT-1 carrying the cry2 genes was isolated from soil samples in Pakistan. The 2-kb full length cry2Ac gene was cloned, sequenced, and submitted to the EMBL DNA database (Accession No. AM292031). For expression analysis, Escherichia coli DH5α was transformed with the fragment sub-cloned in pET22b expression vector using NdeI and HindIII restriction sites, and later confirmed by restriction endonuclease analysis...
November 3, 2017: Toxins
https://www.readbyqxmd.com/read/29074139/optogenetic-control-of-focal-adhesion-kinase-signaling
#10
Maximilian Hörner, Claire Chatelle, Wignand W D Mühlhäuser, David R Stocker, Michael Coats, Wilfried Weber, Gerald Radziwill
Focal adhesion kinase (FAK) integrates signaling from integrins, growth factor receptors and mechanical stress to control cell adhesion, motility, survival and proliferation. Here, we developed a single-component, photo-activatable FAK, termed optoFAK, by using blue light-induced oligomerization of cryptochrome 2 (CRY2) to activate FAK-CRY2 fusion proteins. OptoFAK functions uncoupled from physiological stimuli and activates downstream signaling rapidly and reversibly upon blue light exposure. OptoFAK stimulates SRC creating a positive feedback loop on FAK activation, facilitating phosphorylation of paxillin and p130Cas in adherent cells...
October 23, 2017: Cellular Signalling
https://www.readbyqxmd.com/read/29071562/the-effect-of-light-quality-on-the-pro-antioxidant-balance-activity-of-photosystem-ii-and-expression-of-light-dependent-genes-in-eutrema-salsugineum-callus-cells
#11
P P Pashkovskiy, T N Soshinkova, D V Korolkova, A V Kartashov, I E Zlobin, V Yu Lyubimov, V D Kreslavski, Vl V Kuznetsov
The antioxidant balance, photochemical activity of photosystem II (PSII), and photosynthetic pigment content, as well as the expression of genes involved in the light signalling of callus lines of Eutrema salsugineum plants (earlier Thellungiella salsuginea) under different spectral light compositions were studied. Growth of callus in red light (RL, maximum 660 nm), in contrast to blue light (BL, maximum 450 nm), resulted in a lower H2O2 content and thiobarbituric acid reactive substances (TBARS). The BL increased the activities of key antioxidant enzymes in comparison with the white light (WL) and RL and demonstrated the minimum level of PSII photochemical activity...
October 25, 2017: Photosynthesis Research
https://www.readbyqxmd.com/read/29050555/natural-variation-in-human-clocks
#12
Malcolm von Schantz
Our own species has a diurnal activity pattern and an average circadian period of 24.2h. Exact determination of circadian period requires expensive and intrusive protocols, and investigators are therefore using chronotype questionnaires as a proxy quantitative measure. Both measures show a normal distribution suggestive of a polygenic trait. The genetic components of the 24-h feedback loop that generates circadian rhythms within our cells have been mapped in detail, identifying a number of candidate genes which have been investigated for genetic polymorphisms relating to the phenotypic variance...
2017: Advances in Genetics
https://www.readbyqxmd.com/read/29047221/selection-and-characterization-of-bacillus-thuringiensis-strains-from-northwestern-himalayas-toxic-against-helicoverpa-armigera
#13
Showkat A Lone, Abdul Malik, Jasdeep C Padaria
In this study, we present the selection and the characterization of Bacillus thuringiensis (Bt) strains with respect to their cry/cyt gene content and toxicity evaluation toward one of the most important polyphagous lepidopteran pest, Helicoverpa armigera. Fifty-six Bt isolates were obtained from 10 different regions of northwestern Himalayas, recording a total B. thuringiensis index of 0.62. Scanning electron microscopy revealed presence of bipyramidal, spherical, flat and irregular crystal shapes; SDS-PAGE analysis of spore-crystal mixtures showed the prominence of 130, 70, and 100 kDa protein bands in majority of the isolates; PCR analysis with primers for eight cry and cyt gene families and 13 cry gene subfamilies resulted in isolates showing different combinations of insecticidal genes...
October 18, 2017: MicrobiologyOpen
https://www.readbyqxmd.com/read/29040770/optimized-light-inducible-transcription-in-mammalian-cells-using-flavin-kelch-repeat-f-box1-gigantea-and-cry2-cib1
#14
Jose R Quejada, Seon-Hye E Park, Daniel W Awari, Fan Shi, Hannah E Yamamoto, Fuun Kawano, Juergen C Jung, Masayuki Yazawa
Light-inducible systems allow spatiotemporal control of a variety of biological activities. Here, we report newly optimized optogenetic tools to induce transcription with light in mammalian cells, using the Arabidopsis photoreceptor Flavin Kelch-repeat F-box 1 (FKF1) and its binding partner GIGANTEA (GI) as well as CRY2/CIB1. By combining the mutagenesis of FKF1 with the optimization of a split FKF1/GI dimerized Gal4-VP16 transcriptional system, we identified constructs enabling significantly improved light-triggered transcriptional induction...
November 16, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/29021622/the-circadian-transcriptome-of-marine-fish-sparus-aurata-larvae-reveals-highly-synchronized-biological-processes-at-the-whole-organism-level
#15
M Yúfera, E Perera, J A Mata-Sotres, J Calduch-Giner, G Martínez-Rodríguez, J Pérez-Sánchez
The regulation of circadian gene expression remains largely unknown in farmed fish larvae. In this study, a high-density oligonucleotide microarray was used to examine the daily expression of 13,939 unique genes in whole gilthead sea bream (Sparus aurata) larvae with fast growth potentiality. Up to 2,229 genes were differentially expressed, and the first two components of Principal Component Analysis explained more than 81% of the total variance. Clustering analysis of differentially expressed genes identified 4 major clusters that were triggered sequentially, with a maximum expression at 0 h, 3 h, 9-15 h and 18-21 h zeitgeber time...
October 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28991901/the-blue-light-induced-interaction-of-cryptochrome-1-with-cop1-requires-spa-proteins-during-arabidopsis-light-signaling
#16
Xu Holtkotte, Jathish Ponnu, Margaret Ahmad, Ute Hoecker
Plants constantly adjust their growth, development and metabolism to the ambient light environment. Blue light is sensed by the Arabidopsis photoreceptors CRY1 and CRY2 which subsequently initiate light signal transduction by repressing the COP1/SPA E3 ubiquitin ligase. While the interaction between cryptochromes and SPA is blue light-dependent, it was proposed that CRY1 interacts with COP1 constitutively, i.e. also in darkness. Here, our in vivo co-immunoprecipitation experiments suggest that CRY1 and CRY2 form a complex with COP1 only after seedlings were exposed to blue light...
October 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28986813/effect-of-jiaotai-pill-on-intestinal-damage-in-partially-sleep-deprived-rats
#17
Wen-Ya Huang, Xin Zou, Fu-Er Lu, Chu Zhang, Yan-Lin Ren, Li-Jun Xu, Kai-Fu Wang, Hui Dong
OBJECTIVE: To explore the effect and mechanism of Jiaotai Pill (, JTW) on intestinal mucosal damage in rats with chronic partial sleep deprivation (PSD). METHODS: Obesity resistant (OR) rats were selected, and underwent 4 h PSD by being exposed to environmental noise for 4 weeks. During the whole PSD period, JTW and estazolam were orally given to the rats respectively in the treating groups. Plasma concentration of lipopolysaccharide (LPS) which is the marker of gut-origin endotoxemia was examined...
October 6, 2017: Chinese Journal of Integrative Medicine
https://www.readbyqxmd.com/read/28986016/effects-of-intentionally-treated-water-on-growth-of-arabidopsis-thaliana-seeds-with-cryptochrome-mutations
#18
Yung-Jong Shiah, Hsu-Liang Hsieh, Huai-Ju Chen, Dean I Radin
OBJECTIVE: A previous experiment suggested that consumption of intentionally treated tea influenced subjective mood under double-blind, controlled conditions. To investigate that effect objectively, again under double-blind, controlled conditions, we studied whether Arabidopsis thaliana seeds hydrated with intentionally treated vs. untreated water would show differences in hypocotyl length, anthocyanin, and chlorophyll. DESIGN: Three Buddhist monks focused their intention on commercially bottled water with the goal of improving the growth of seeds; bottled water from the same source served as an untreated control...
August 30, 2017: Explore: the Journal of Science and Healing
https://www.readbyqxmd.com/read/28970786/circadian-clock-protein-content-and-daily-rhythm-of-locomotor-activity-are-altered-after-chronic-exposure-to-lead-in-rat
#19
Mariam Sabbar, Ouria Dkhissi-Benyahya, Abdelhamid Benazzouz, Nouria Lakhdar-Ghazal
Lead exposure has been reported to produce many clinical features, including parkinsonism. However, its consequences on the circadian rhythms are still unknown. Here we aimed to examine the circadian rhythms of locomotor activity following lead intoxication and investigate the mechanisms by which lead may induce alterations of circadian rhythms in rats. Male Wistar rats were injected with lead or sodium acetate (10 mg/kg/day, i.p.) during 4 weeks. Both groups were tested in the "open field" to quantify the exploratory activity and in the rotarod to evaluate motor coordination...
2017: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/28944151/isolation-and-characterization-of-bacillus-thuringiensis-strains-native-to-assam-soil-of-north-east-india
#20
Mihir Rabha, Shaswati Sharma, Sumita Acharjee, Bidyut Kumar Sarmah
We have identified both crystalliferous and acrystalliferous Bt isolates from the Assam soil of North East India for the first time. A total of 301 Bacillus type colonies were selected based on their appearance and colony morphology. Out of these colonies, 42 isolates had characteristics similar to Bt isolates on MYP (Mannitol Egg Yolk Polymyxin) agar base medium. The ERIC-PCR and 16S rDNA analyses confirmed that 42 isolates are Bacillus thuringiensis. Phase contrast microscopy showed that 37 isolates produced crystal endospore during the sporulation phase and 5 acrystalliferous isolates were also found...
October 2017: 3 Biotech
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