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Marine Biotechnology

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https://www.readbyqxmd.com/read/28733934/draft-genome-sequence-of-the-deep-sea-bacterium-moritella-sp-jt01-and-identification-of-biotechnologically-relevant-genes
#1
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...
July 22, 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
#2
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...
July 19, 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
#3
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...
July 11, 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
#4
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...
July 11, 2017: Marine Biotechnology
https://www.readbyqxmd.com/read/28698958/nitrogen-effect-on-water-soluble-polysaccharide-accumulation-in-streblonema-sp-ectocarpales-phaeophyceae
#5
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...
July 11, 2017: Marine Biotechnology
https://www.readbyqxmd.com/read/28695385/recovery-of-previously-uncultured-bacterial-genera-from-three-mediterranean-sponges
#6
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...
July 10, 2017: Marine Biotechnology
https://www.readbyqxmd.com/read/28695384/carbonic-anhydrase-inhibitors-induce-developmental-toxicity-during-zebrafish-embryogenesis-especially-in-the-inner-ear
#7
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...
July 10, 2017: Marine Biotechnology
https://www.readbyqxmd.com/read/28688034/preparation-structure-and-potent-antifouling-activity-of-sclerotioramine-derivatives
#8
Mei-Yan Wei, Cui-Fang Wang, Kai-Ling Wang, Pei-Yuan Qian, Chang-Yun Wang, Chang-Lun Shao
A series of 30 sclerotioramine derivatives (2-31) of the natural compound, (+)-sclerotiorin (1), has been successfully semi-synthesized by a one-step reaction with high yields (up to 80%). The structures of these new derivatives were established by extensive spectroscopic methods and single-crystal X-ray diffraction analysis for 3, 6, and 10. (+)-Sclerotiorin (1) and its semisynthetic derivatives (2-31) were evaluated for their antifouling activity. Most of them except 6, 7, 8, 12, and 28 showed potent antifouling activity against the larval settlement of the barnacle Balanus amphitrite...
July 7, 2017: Marine Biotechnology
https://www.readbyqxmd.com/read/28681105/chimeras-linked-to-tandem-repeats-and-transposable-elements-in-tetraploid-hybrid-fish
#9
Lihai Ye, Ni Jiao, Xiaojun Tang, Yiyi Chen, Xiaolan Ye, Li Ren, Fangzhou Hu, Shi Wang, Ming Wen, Chun Zhang, Min Tao, Shaojun Liu
The formation of the allotetraploid hybrid lineage (4nAT) encompasses both distant hybridization and polyploidization processes. The allotetraploid offspring have two sets of sub-genomes inherited from both parental species, and therefore, it is important to explore its genetic structure. Herein, we construct a bacterial artificial chromosome library of allotetraploids, and then sequence and analyze the full-length sequences of 19 bacterial artificial chromosomes. Sixty-eight DNA chimeras are identified, which are divided into four models according to the distribution of the genomic DNA derived from the parents...
July 5, 2017: Marine Biotechnology
https://www.readbyqxmd.com/read/28674930/trojan-horse-strategy-for-non-invasive-interference-of-clock-gene-in-the-oyster-crassostrea-gigas
#10
Laura Payton, Mickael Perrigault, Jean-Paul Bourdineaud, Anjara Marcel, Jean-Charles Massabuau, Damien Tran
RNA interference is a powerful method to inhibit specific gene expression. Recently, silencing target genes by feeding has been successfully carried out in nematodes, insects, and small aquatic organisms. A non-invasive feeding-based RNA interference is reported here for the first time in a mollusk bivalve, the pacific oyster Crassostrea gigas. In this Trojan horse strategy, the unicellular alga Heterocapsa triquetra is the food supply used as a vector to feed oysters with Escherichia coli strain HT115 engineered to express the double-stranded RNA targeting gene...
July 3, 2017: Marine Biotechnology
https://www.readbyqxmd.com/read/28643227/preparation-and-characterization-of-alginate-microparticles-containing-a-model-protein-for-oral-administration-in-gnotobiotic-european-sea-bass-dicentrarchus-labrax-larvae
#11
Eamy Nursaliza Yaacob, Jens Goethals, Aline Bajek, Kristof Dierckens, Peter Bossier, Bruno G De Geest, Daisy Vanrompay
Aquaculture is the fastest growing animal production sector. However, the production of marine fish is still hampered by the high mortality rate in the first few weeks after hatching. Mortality in larvae is often caused by microbial infections. Today, the incorporation of immunostimulants into microparticles provides us new tools to enhance disease resistance in marine larviculture. In this study, we prepared alginate microparticles loaded with the model antigen fluorescein isothiocyanate conjugated-bovine serum albumin...
June 22, 2017: Marine Biotechnology
https://www.readbyqxmd.com/read/28623567/molecular-identification-and-comparative-evaluation-of-tropical-marine-microalgae-for-biodiesel-production
#12
Sanyo Sabu, I S Bright Singh, Valsamma Joseph
Marine microalgae have emerged as important feedstock for liquid biofuel production. The identification of lipid-rich native microalgal species with high growth rate and optimal fatty acid profile and biodiesel properties is the most challenging step in microalgae-based biodiesel production. In this study, attempts have been made to bio-prospect the biodiesel production potential of marine and brackish water microalgal isolates from the west coast of India. A total of 14 microalgal species were isolated, identified using specific molecular markers and based on the lipid content; seven species with total lipid content above 20% of dry cell weight were selected for assessing biodiesel production potential in terms of lipid and biomass productivities, nile red fluorescence, fatty acid profile and biodiesel properties...
June 16, 2017: Marine Biotechnology
https://www.readbyqxmd.com/read/28612090/organic-solvent-tolerant-marine-microorganisms-as-catalysts-for-kinetic-resolution-of-cyclic-%C3%AE-hydroxy-ketones
#13
Bi -Shuang Chen, Hui Liu, Fayene Zeferino Ribeiro de Souza, Lan Liu
Chiral cyclic β-hydroxy ketones represent key motifs in the production of natural products of biological interest. Although the molecules are structurally simple, they require cumbersome synthetic steps to get access to them and their synthesis remains a challenge in organic chemistry. In this report, we describe a straightforward approach to enantiomerically enriched (R)- and (S)-3-hydroxycyclopentanone 2a, (R)- and (S)-3-hydroxycyclohexanone 2b, and (R)- and (S)-3-hydroxycycloheptanone 2c involving a transesterification resolution of the racemates using whole cells of marine microorganisms as catalysts and vinyl acetate the acyl donor and solvent...
June 13, 2017: Marine Biotechnology
https://www.readbyqxmd.com/read/28601969/genome-wide-association-study-reveals-multiple-novel-qtl-associated-with-low-oxygen-tolerance-in-hybrid-catfish
#14
Xiaoxiao Zhong, Xiaozhu Wang, Tao Zhou, Yulin Jin, Suxu Tan, Chen Jiang, Xin Geng, Ning Li, Huitong Shi, Qifan Zeng, Yujia Yang, Zihao Yuan, Lisui Bao, Shikai Liu, Changxu Tian, Eric Peatman, Qi Li, Zhanjiang Liu
Hypoxic condition is common in aquaculture, leading to major economic losses. Genetic analysis of hypoxia tolerance, therefore, is not only scientifically significant, but also economically important. Catfish is generally regarded as being highly tolerant to low dissolved oxygen, but variations exist among various populations, strains, and species. In this study, we conducted a genome-wide association study (GWAS) using the catfish 250 K SNP array to identify quantitative trait locus (QTL) associated with tolerance to low dissolved oxygen in the channel catfish × blue catfish interspecific system...
June 10, 2017: Marine Biotechnology
https://www.readbyqxmd.com/read/28578488/17%C3%AE-estradiol-increases-non-cpg-methylation-in-exon-1-of-the-rainbow-trout-oncorhynchus-mykiss-myod-gene
#15
Prasanthi P Koganti, Jian Wang, Beth Cleveland, Jianbo Yao
MyoD is an important myogenic transcription factor necessary for the differentiation of myogenic precursor cells (MPC) to form mature myotubes, a process essential for muscle growth. Epigenetic markers such as CpH methylation are known gene regulators that are important for the differentiation process. In this study, we investigated whether DNA methylation is a potential mechanism associated with the ability of 17β-estradiol (E2) to reduce MyoD gene expression and muscle growth in rainbow trout. Rainbow trout received a single intraperitoneal injection of E2 or the injection vehicle (control)...
June 3, 2017: Marine Biotechnology
https://www.readbyqxmd.com/read/28527016/chemical-derivatization-of-metabolite-mass-profiling-of-the-recretohalophyte-aeluropus-lagopoides-revealing-salt-stress-tolerance-mechanism
#16
Murali Krishna Paidi, Parinita Agarwal, Prashant More, Pradeep K Agarwal
Plants are the primary producers of food for human being. Their intracellular environment alternation is influenced by abiotic stress factors such as drought, heat and soil salinity. Aeluropus lagopoides is a strong halophyte that grows with ease under high saline muddy banks of creeks of Gujarat, India. To study the response of salinity on metabolite changes in Aeluropus, three treatments, i.e. control, salinity and recovery, were selected for both shoot and root tissue. The cytosolic metabolite state was analysed by molecular chemical derivatization gas chromatography mass profiling...
May 19, 2017: Marine Biotechnology
https://www.readbyqxmd.com/read/28508952/identification-of-sex-determining-loci-in-pacific-white-shrimp-litopeneaus-vannamei-using-linkage-and-association-analysis
#17
Yang Yu, Xiaojun Zhang, Jianbo Yuan, Quanchao Wang, Shihao Li, Hao Huang, Fuhua Li, Jianhai Xiang
The Pacific white shrimp Litopenaeus vannamei is a predominant aquaculture shrimp species in the world. Like other animals, the L. vannamei exhibited sexual dimorphism in growth trait. Mapping of the sex-determining locus will be very helpful to clarify the sex determination system and further benefit the shrimp aquaculture industry towards the production of mono-sex stocks. Based on the data used for high-density linkage map construction, linkage-mapping analysis was conducted. The sex determination region was mapped in linkage group (LG) 18...
May 16, 2017: Marine Biotechnology
https://www.readbyqxmd.com/read/28501901/production-of-mycosporine-like-amino-acids-from-gracilaria-vermiculophylla-rhodophyta-cultured-through-one-year-in-an-integrated-multi-trophic-aquaculture-imta-system
#18
Marta Barceló-Villalobos, Félix L Figueroa, Nathalie Korbee, Félix Álvarez-Gómez, Maria H Abreu
This study evaluates the production of biomass and mycosporine-like amino acids (MAAs) throughout the year in Gracilaria vermiculophylla (Rhodophyta) collected in Ria de Aveiro (Portugal). The algae were grown in outdoor tanks in seawater with the addition of fishpond effluents under two different water flows (100 and 200 L h(-1)) in an integrated multi-trophic aquaculture (IMTA) system (tanks 1200 L; 1.5 m(2)) and different algal densities (3, 5, and 7 kg m(-2)). MAA content in IMTA seaweeds was significantly affected by the interaction of time and stocking density, but not by the water flow...
May 13, 2017: Marine Biotechnology
https://www.readbyqxmd.com/read/28500614/irf9-stat2-fusion-protein-as-an-innate-immune-inducer-to-activate-mx-and-interferon-stimulated-gene-expression-in-zebrafish-larvae
#19
Chang-Jen Huang, Chih-Ming Chou, Huang-Wei Lien, Cheng-Ying Chu, Jhih-Yun Ho, Yimin Wu, Chia-Hsiung Cheng
Virus infection often causes large amounts of mortality during teleost larvae stage. Strong induction of innate immunity to increase survival rates of teleost larvae has been less reported. In this study, we present a zebrafish IRF9-Stat2 fusion protein (zIRF9-S2C) as a strong innate immunity inducer and characterized induction of interferon-stimulated genes (ISGs) in zebrafish larvae. zIRF9-S2C could mimic IFN-stimulated gene factor 3 (ISGF3) complex to constitutively activate transcription of Mx promoter through IFN-stimulatory element (ISRE) sites...
May 12, 2017: Marine Biotechnology
https://www.readbyqxmd.com/read/28500613/functional-diets-modulate-lncrna-coding-rnas-and-gene-interactions-in-the-intestine-of-rainbow-trout-oncorhynchus-mykiss
#20
Gustavo Núñez-Acuña, Camille Détrée, Cristian Gallardo-Escárate, Ana Teresa Gonçalves
The advent of functional genomics has sparked the interest in inferring the function of non-coding regions from the transcriptome in non-model species. However, numerous biological processes remain understudied from this perspective, including intestinal immunity in farmed fish. The aim of this study was to infer long non-coding RNA (lncRNAs) expression profiles in rainbow trout (Oncorhynchus mykiss) fed for 30 days with functional diets based on pre- and probiotics. For this, whole transcriptome sequencing was conducted through Illumina technology, and lncRNAs were mined to evaluate transcriptional activity in conjunction with known protein sequences...
May 12, 2017: Marine Biotechnology
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