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Marine Biotechnology

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https://www.readbyqxmd.com/read/29151140/effects-of-oxygen-availability-on-oxidative-stress-biomarkers-in-the-mediterranean-mussel-mytilus-galloprovincialis
#1
Alessia Giannetto, Maria Maisano, Tiziana Cappello, Sabrina Oliva, Vincenzo Parrino, Antonino Natalotto, Giuseppe De Marco, Salvatore Fasulo
In aquatic environments, hypoxia and oxygen-deficient areas are increasing worldwide. Transitions in oxygen levels can influence the production of reactive oxygen species (ROS), eventually leading to oxidative stress. The transcriptional response of oxidative stress biomarkers was evaluated by qPCR in gill tissue from Mytilus galloprovincialis experimentally subjected to 48-h air exposure followed by 48-h re-oxygenation, as compared to normoxic control mussels. Superoxide dismutases (CuZnsod and Mnsod), catalase (cat), and glutathione S-transferase (gst) were over-expressed early after 8-h air exposure and returned to normoxic levels during re-oxygenation...
November 18, 2017: Marine Biotechnology
https://www.readbyqxmd.com/read/29151139/integration-of-bacterial-expansin-on-agarolytic-complexes-to-enhance-the-degrading-activity-of-red-algae-by-control-of-gelling-properties
#2
Da Woon Jeong, Jeong Eun Hyeon, Young-Chul Joo, Sang Kyu Shin, Sung Ok Han
Expansin act by loosening hydrogen bonds in densely packed polysaccharides. This work characterizes the biological functions of expansin in the gelling and degradation of algal polysaccharides. In this study, the bacterial expansin BpEX from Bacillus pumilus was fused with the dockerin module of a cellulosome system for assembly with agarolytic complexes. The assembly of chimeric expansin caused an indicative enhancement in agarase activity. The enzymatic activities on agar substrate and natural biomass were 3...
November 18, 2017: Marine Biotechnology
https://www.readbyqxmd.com/read/29127523/identification-of-quantitative-trait-loci-for-resistance-to-rsivd-in-red-sea-bream-pagrus-major
#3
Eitaro Sawayama, Shiho Tanizawa, Shin-Ichi Kitamura, Kei Nakayama, Kohei Ohta, Akiyuki Ozaki, Motohiro Takagi
Red sea bream iridoviral disease (RSIVD) is a major viral disease in red sea bream farming in Japan. Previously, we identified one candidate male individual of red sea bream that was significantly associated with convalescent individuals after RSIVD. The purpose of this study is to identify the quantitative trait loci (QTL) linked to the RSIVD-resistant trait for future marker-assisted selection (MAS). Two test families were developed using the candidate male in 2014 (Fam-2014) and 2015 (Fam-2015). These test families were challenged with RSIV, and phenotypes were evaluated...
November 10, 2017: Marine Biotechnology
https://www.readbyqxmd.com/read/29080933/statistical-optimization-of-culture-variables-for-enhancing-agarase-production-by-dendryphiella-arenaria-utilizing-palisada-perforata-rhodophyta-and-enzymatic-saccharification-of-the-macroalgal-biomass
#4
Mohamed Gomaa, Awatief F Hifney, Mustafa A Fawzy, Khayria M Abdel-Gawad
Agarase is a promising biocatalyst for several industrial applications. Agarase production was evaluated by the marine fungus Dendryphiella arenaria utilizing Palisada perforata as a basal substrate in semi-solid state fermentation. Seaweed biomass, glucose, and sucrose were the most significant parameters affecting agarase production, and their levels were further optimized using Box-Behnken design. The maximum agarase activity was 7.69 U/mL. Agarase showed a degree of thermostability with half-life of 99 min at 40 °C, and declining to 44...
October 28, 2017: Marine Biotechnology
https://www.readbyqxmd.com/read/28980193/expression-of-thiaminase-in-zebrafish-danio-rerio-is-lethal-and-has-implications-for-use-as-a-biocontainment-strategy-in-aquaculture-and-invasive-species
#5
Sandra Noble, Vishal Saxena, Marc Ekker, Robert Devlin
As the world increasingly relies on aquaculture operations to meet rising seafood demands, reliable biocontainment measures for farmed fish stocks are desired to minimize ecological impacts arising from interactions of cultured fish with wild populations. One possible biocontainment strategy is to induce a dietary dependence on a vitamin, such as thiamine (vitamin B1), required for survival. Fish expressing thiaminase (an enzyme that degrades thiamine) within a confined aquaculture facility could receive supplemental thiamine to allow survival and normal growth, whereas escapees lacking this dietary rescue would die from thiamine deficiency...
October 5, 2017: Marine Biotechnology
https://www.readbyqxmd.com/read/28971324/a-genome-wide-association-study-reveals-that-genes-with-functions-for-bone-development-are-associated-with-body-conformation-in-catfish
#6
Xin Geng, Shikai Liu, Zihao Yuan, Yanliang Jiang, Degui Zhi, Zhanjiang Liu
Body conformation is of great scientific and commercial interest for aquaculture fish species because it affects biological adaptation of the organism to environments, and is of economic importance to the aquaculture industry considering its direct effect on fillet yield. Catfish is the primary aquaculture species in the USA. Two major species used in the aquaculture industry, channel catfish and blue catfish, differ in body shape and therefore the backcross progenies serve as a good model for quantitative trait locus (QTL) analysis...
October 2, 2017: Marine Biotechnology
https://www.readbyqxmd.com/read/28942506/production-of-tiger-puffer-takifugu-rubripes-offspring-from-triploid-grass-puffer-takifugu-niphobles-parents
#7
Masaomi Hamasaki, Yutaka Takeuchi, Ryosuke Yazawa, Souta Yoshikawa, Kazushi Kadomura, Toshiyuki Yamada, Kadoo Miyaki, Kiyoshi Kikuchi, Goro Yoshizaki
The tiger puffer Takifugu rubripes is one of the most popular aquacultural fish; however, there are two major obstacles to selective breeding. First, they have a long generation time of 2 or 3 years until maturation. Second, the parental tiger puffer has a body size (2-5 kg) much larger than average market size (0.6-1.0 kg). The grass puffer Takifugu niphobles is closely related to the tiger puffer and matures in half the time. Furthermore, grass puffer can be reared in small areas since their maturation weight is about 1/150 that of mature tiger puffer...
September 23, 2017: Marine Biotechnology
https://www.readbyqxmd.com/read/28920148/differential-gene-expression-profiles-and-alternative-isoform-regulations-in-gill-of-nile-tilapia-in-response-to-acute-hypoxia
#8
Hong Lian Li, Hao Ran Lin, Jun Hong Xia
Fish often encounters exposures to acute environmental hypoxia either spatially or temporally. Gill organ plays important roles in response to hypoxic stress in fish. Few studies focus on the molecular regulation mechanisms of gills under hypoxic stress. In this study, we investigated the transcriptomic response to 12-h acute hypoxia in gill of a hypoxia tolerant fish, Nile tilapia Oreochromis niloticus through RNA sequencing (RNA-Seq). We sequenced messenger RNA from three control samples and three hypoxia-treated samples...
September 18, 2017: Marine Biotechnology
https://www.readbyqxmd.com/read/28884399/bias-and-correction-in-rna-seq-data-for-marine-species
#9
Kai Song, Li Li, Guofan Zhang
RNA-seq is a recently developed approach widely used for transcriptome profiling in biological analyses that use next-generation sequencing technologies. Accurate estimation of gene expression levels is critical for answering biological questions. Here, we show that the commonly used measure of gene expression levels, fragments per kilobase of transcript per million mapped reads (FPKM), is biased in transcript length, GC content, and dinucleotide frequencies in the RNA-seq analysis of marine species. We used a generalized linear model to correct the observed biases of FPKM...
October 2017: Marine Biotechnology
https://www.readbyqxmd.com/read/28861717/estimates-of-heritability-for-growth-and-shell-color-traits-and-their-genetic-correlations-in-the-black-shell-strain-of-pacific-oyster-crassostrea-gigas
#10
Lan Xu, Qi Li, Hong Yu, Lingfeng Kong
The Pacific oyster Crassostrea gigas has been introduced widely and massively and became an economically important aquaculture species on a global scale. We estimated heritabilities of growth and shell color traits and their genetic correlations in black shell strain of C. gigas. Analyses were performed on 22 full-sib families in a nested mating design including 410 individuals at harvest (24 months of age). The parentage assignment was inferred based on four panels of multiplex PCR markers including 10 microsatellite loci and 94...
October 2017: Marine Biotechnology
https://www.readbyqxmd.com/read/28822037/effect-of-initiation-time-of-hydrostatic-pressure-shock-on-chromosome-set-doubling-of-tetraploidization-in-turbot-scophthalmus-maximus
#11
Xiangping Zhu, Zhengmei Lin, Zhihao Wu, Jiandong Li, Feng You
The objective of the study was to clarify the effects of initiation time on chromosome set doubling induced by hydrostatic pressure shock through nuclear phase fluorescent microscopy in turbot Scophthalmus maximus. The ratio of developmentally delayed embryo and chromosome counting was used to assess induction efficiency. For the embryos subjected to a pressure of 67.5 MPa for 6 min at prometaphase (A group), chromosomes recovered to the pre-treatment condition after 11-min recovering. The first nuclear division and cytokinesis proceeded normally...
October 2017: Marine Biotechnology
https://www.readbyqxmd.com/read/28779262/locus-mapping-molecular-cloning-and-expression-analysis-of-rps6kb2-a-novel-metamorphosis-related-gene-in-chinese-tongue-sole-cynoglossus-semilaevis
#12
Yang Liu, Min Wei, Hua Guo, Changwei Shao, Liang Meng, Wenteng Xu, Na Wang, Lei Wang, Deborah M Power, Jilun Hou, Shahid Mahboob, Zhongkai Cui, Yingming Yang, Yangzhen Li, Fazhen Zhao, Songlin Chen
Flatfish metamorphosis denotes the extraordinary transformation of a symmetric pelagic larva into an asymmetric benthic juvenile. This unique process involves eye migration, a 90° rotation in posture, and asymmetrical pigmentation for adaptation to a benthic lifestyle. In the present study, we used genetics to map a metamorphosis-related locus (q-10M) in the male linkage group (LG10M), a small interval of 0.9 cM corresponding to a 1.8 M-bp physical area in chromosome 9 in the Chinese tongue sole (Cynoglossus semilaevis)...
October 2017: Marine Biotechnology
https://www.readbyqxmd.com/read/28758171/qtl-mapping-for-resistance-to-iridovirus-in-asian-seabass-using-genotyping-by-sequencing
#13
Le Wang, Bin Bai, Shuqing Huang, Peng Liu, Zi Yi Wan, Baoqing Ye, Jinlu Wu, Gen Hua Yue
Identifying quantitative trait loci (QTL) for viral disease resistance is of particular importance in selective breeding programs of fish species. Genetic markers linked to QTL can be useful in marker-assisted selection (MAS) for elites resistant to specific pathogens. Here, we conducted a genome scan for QTL associated with Singapore grouper iridovirus (SGIV) resistance in an Asian seabass (Lates calcarifer) family, using a high-density linkage map generated with genotyping-by-sequencing. One genome-wide significant and three suggestive QTL were detected at LG21, LG6, LG13, and LG15, respectively...
October 2017: Marine Biotechnology
https://www.readbyqxmd.com/read/28733934/draft-genome-sequence-of-the-deep-sea-bacterium-moritella-sp-jt01-and-identification-of-biotechnologically-relevant-genes
#14
Robert Cardoso de Freitas, Estácio Jussie Odisi, Chiaki Kato, Marcus Adonai Castro da Silva, André Oliveira de Souza Lima
Deep-sea bacteria can produce various biotechnologically relevant enzymes due to their adaptations to high pressures and low temperatures. To identify such enzymes, we have sequenced the genome of the polycaprolactone-degrading bacterium Moritella sp. JT01, isolated from sediment samples from Japan Trench (6957 m depth), using a Illumina HiSeq2000 sequencer (12.1 million paired-end reads) and CLC Genomics Workbench (version 6.5.1) for the assembly, resulting in a 4.83-Mb genome (42 scaffolds). The genome was annotated using Rapid Annotation using Subsystem Technology (RAST), Protein Homology/analogY Recognition Engine V 2...
October 2017: Marine Biotechnology
https://www.readbyqxmd.com/read/28725940/construction-of-the-first-high-density-genetic-linkage-map-and-analysis-of-quantitative-trait-loci-for-growth-related-traits-in-sinonovacula-constricta
#15
Donghong Niu, Yunchao Du, Ze Wang, Shumei Xie, Haideng Nguyen, Zhiguo Dong, Heding Shen, Jiale Li
The razor clam (Sinonovacula constricta) is an important aquaculture species, for which a high-density genetic linkage map would play an important role in marker-assisted selection (MAS). In this study, we constructed a high-density genetic map and detected quantitative trait loci (QTLs) for Sinonovacula constricta with an F1 cross population by using the specific locus amplified fragment sequencing (SLAF-seq) method. A total of 315,553 SLAF markers out of 467.71 Mreads were developed. The final linkage map was composed of 7516 SLAFs (156...
October 2017: Marine Biotechnology
https://www.readbyqxmd.com/read/28698960/genome-wide-qtl-analysis-identified-significant-associations-between-hypoxia-tolerance-and-mutations-in-the-gpr132-and-abcg4-genes-in-nile-tilapia
#16
Hong Lian Li, Xiao Hui Gu, Bi Jun Li, Chao Hao Chen, Hao Ran Lin, Jun Hong Xia
Exposure to hypoxia induces both acute and chronic stress responses, which plays an important role in health of cultured organisms including growth, reproduction, immunity, and other energy demanding activities. Application of advanced genomic technologies allows rapid identification of hypoxia trait-associated genes and precise selection of superior brood stocks with high tolerance in tilapia. By applying QTL-seq and double-digest restriction-site associated DNA sequencing (ddRAD-seq) techniques, we identified four genome-wide significant quantitative trait loci (QTLs) for hypoxia tolerance and many suggestive QTLs in Nile tilapia...
October 2017: Marine Biotechnology
https://www.readbyqxmd.com/read/28698959/isolation-and-antibiotic-screening-of-fungi-from-a-hydrothermal-vent-site-and-characterization-of-secondary-metabolites-from-a-penicillium-isolate
#17
Chengqian Pan, Yutong Shi, Bibi Nazia Auckloo, Syed Shams Ul Hassan, Najeeb Akhter, Kuiwu Wang, Ying Ye, Chen-Tung Arthur Chen, Xinyi Tao, Bin Wu
Five new compounds were isolated from Penicillium sp. Y-5-2 including an austin derivative 4, four isocoumarins 9, 11, 12, and 13, together with two known isocoumarins 8 and 10, and six known austin derivatives 1, 2, 3, 5, 6, and 7 and one phenol 14. Their structures and relative configurations were established by spectroscopic means. The absolute configurations of 4, 11, and 13 were defined mainly by comparison of quantum chemical TDDFT calculated and experimental ECD spectra. The cyclization of the pentan-2-ol pendant at C-3 in compound 13 allowed the assignment of a new 2,3,4,4a,6,10b-hexahydro-1H-benzo[c]chromene isocoumarin skeleton...
October 2017: Marine Biotechnology
https://www.readbyqxmd.com/read/28695385/recovery-of-previously-uncultured-bacterial-genera-from-three-mediterranean-sponges
#18
Dennis Versluis, Kyle McPherson, Mark W J van Passel, Hauke Smidt, Detmer Sipkema
Sponges often harbour a dense and diverse microbial community. Presently, a large discrepancy exists between the cultivable bacterial fraction from sponges and the community in its natural environment. Here, we aimed to acquire additional insights into cultivability of (previously uncultured) bacteria from three sponge species, namely Aplysina aerophoba, Corticium candelabrum and Petrosia ficiformis, by studying bacterial growth on five media in the form of 60 communities scraped from plates without antibiotics, as well as in the form of individual isolates that were grown on these media supplemented with antibiotics...
October 2017: Marine Biotechnology
https://www.readbyqxmd.com/read/28695384/carbonic-anhydrase-inhibitors-induce-developmental-toxicity-during-zebrafish-embryogenesis-especially-in-the-inner-ear
#19
Hiroko Matsumoto, Shoko Fujiwara, Hisako Miyagi, Nobuhiro Nakamura, Yasuhiro Shiga, Toshihiro Ohta, Mikio Tsuzuki
In vertebrates, carbonic anhydrases (CAs) play important roles in ion transport and pH regulation in many organs, including the eyes, kidneys, central nervous system, and inner ear. In aquatic organisms, the enzyme is inhibited by various chemicals present in the environment, such as heavy metals, pesticides, and pharmaceuticals. In this study, the effects of CA inhibitors, i.e., sulfonamides [ethoxyzolamide (EZA), acetazolamide (AZA), and dorzolamide (DZA)], on zebrafish embryogenesis were investigated. In embryos treated with the sulfonamides, abnormal development, such as smaller otoliths, an enlarged heart, an irregular pectoral fin, and aberrant swimming behavior, was observed...
October 2017: Marine Biotechnology
https://www.readbyqxmd.com/read/28698958/nitrogen-effect-on-water-soluble-polysaccharide-accumulation-in-streblonema-sp-ectocarpales-phaeophyceae
#20
Anna V Skriptsova
The water-soluble polysaccharides of brown algae attract the increasing attention of researchers as an important class of polymeric materials of biotechnological interest. The sole source for production of these polysaccharides has been large brown seaweeds such as members of Laminariales and Fucales. A new source of water-soluble polysaccharides is suggested here: it is a filamentous brown alga Streblonema sp., which can be cultivated under controlled conditions in photobioreactors that allow obtaining algal biomass with reproducible content and quality of polysaccharides...
August 2017: Marine Biotechnology
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