Chinese Shrimp Fenneropenaeus Chinensis Research Articles

A unique Ca2+-inhibited C-type lectin in shrimp Fenneropenaeuschinensis

C-type lectins (CTLs) are glycan-binding pattern recognition receptors (PRRs) that can bind to carbohydrates on pathogen surfaces, triggering immune responses in shrimp innate immunity. In this study, a unique Ca2+-inhibited CTL named FcLec was identified and characterized in Chinese shrimp Fenneropenaeus chinensis. The full-length cDNA sequence of FcLec was 976 bp (GenBank accession number KU361826), with a 615 bp open reading frame (ORF) encoding 204 amino acids. FcLec possesses a C-type lectin-like domain (CTLD) containing four conserved cysteines (Cys105, Cys174, Cys192, and Cys200) and two sugar-binding site structures (QPD and LNP). The tertiary structure of FcLec deduced revealed three α-helices and eight β-pleated sheets. The mRNA expression levels of FcLec in hemocytes and the hepatopancreas were markedly elevated after stimulation with Vibrio anguillarum and white spot syndrome virus (WSSV). The recombinant FcLec protein exhibited Ca2+-independent hemagglutination and bacterial agglutination, but these activities were observed only in the presence of EDTA to chelate metal ions. These findings suggest that FcLec plays important and functionally distinct roles in the shrimp's innate immune response to bacteria and viruses, enriching the current understanding of the relationship between CTL activity and Ca2+ in invertebrates.

Response surface methodology to optimize the sterilization process of slightly acidic electrolyzed water for Chinese shrimp (Fenneropenaeus chinensis) and to investigate its effect on shrimp quality

Chinese shrimps are popular among consumers for their delicious taste and high nutritional value, but they are highly susceptible to deterioration due to microbial contamination with degradation of texture, color and flavor. The aim of this study was to evaluate the effects of available chlorine concentration (ACC), processing time and material-liquid ratio on the bacterial inhibition rate of shrimp treated with slightly acidic electrolyzed water (SAEW). The effective parameters were optimized by response surface methodology to the optimal bactericidal conditions: ACC 88 mg/L, processing time 12 min, and material-liquid ratio 1:4. The actual bactericidal inhibition rate of shrimp under these conditions was 37.60 %. On this basis, the quality, color difference and textural changes of shrimp treated with SAEW, sodium hypochlorite and alkaline electrolytic water were compared and investigated during storage at 4 °C. The combined results showed that the SAEW treatment could extend the shelf-life by more than 2 d.

Molecular identification and biochemical characteristics of a delta class glutathione S-transferase gene (FcδGST) from Chinese shrimp Fenneropenaeus chinensis

Molecular identification and biochemical characteristics of a delta class glutathione S-transferase gene (FcδGST) from Chinese shrimp Fenneropenaeus chinensis

Effects of high-salinity on the expression of aquaporins and ion transport-related genes in Chinese shrimp (Fenneropenaeus chinensis)

Salinity is one of the most common environmental stress factors, which has a substantial influence on the growth, metabolism, and distribution of crustaceans, while transport of ions and water are considered to play important roles in response to salinity stress. The Chinese shrimp (Fenneropenaeus chinensis) is an important shrimp species cultured in northern China and salinity conditions influence its commercial farming significantly. The study aims to elucidate the potential roles of ion-transport related genes Na+/K+-ATPase α subunit (NKAα), cytoplasmic carbonic anhydrase (CAc), and V-type H+-ATPase subunits (VHA-C, VHA-F, and VHA-G), and water channels of aquaporins (AQP3 and AQP4) in F. chinensis under high-salinity stress. The open reading frames (ORFs) of these genes were cloned, validated, and characterized based on blast against the transcriptomic data. Tissue distribution analysis revealed the predominant expression of these genes in the gills. Then, qPCR was used to examine the expression patterns of genes in the post-larvae shrimp and the gills of adult shrimp in response to hyper-osmotic challenges with two salinities (40 and 45). The results showed that the relative expression levels of these genes were all significantly decreased (p < 0.05) in the post-larvae shrimp after 3 h of high-salinity exposure. With continued stress, the expression levels of these genes varied depending on the intensity, exposure time, and treatment conditions of salinity stress. On the other hand, these genes were also significantly down-regulated (p < 0.05) and continuously decreased up to 12 h in the gills of adult shrimp under high-salinity stress. The results indicated the cooperation of these genes to reduce cellular water efflux and ion uptake or excretion in response to high-salinity environments. Our findings provided insights into the regulatory mechanisms employed during the adaption to high-salinity stress of F. chinensis.

Assessing accuracy of genomic breeding values of selection candidates under biosecurity restrictions by progeny testing in Chinese shrimp Fenneropenaeus chinensis

Assessing accuracy of genomic breeding values of selection candidates under biosecurity restrictions by progeny testing in Chinese shrimp Fenneropenaeus chinensis

Identification and characterization of a cyclophilin A gene from Chinese shrimp Fenneropenaeus chinensis: sequence features and expression profiles

Identification and characterization of a cyclophilin A gene from Chinese shrimp Fenneropenaeus chinensis: sequence features and expression profiles

Molecular characterization and expression ananlysis of a QM protein gene from Chinese shrimp Fenneropenaeus chinensis

Molecular characterization and expression ananlysis of a QM protein gene from Chinese shrimp Fenneropenaeus chinensis

Genetic identification of Chinese shrimp Fenneropenaeus chinensis post-release in Jinzhou Bay: Implications for management of stock enhancement

The Chinese shrimp (Fenneropenaeus chinensis), one of the important fishery resources in North China, has sharply declined. Artificial propagation and release of F. chinensis have been developed in recent decades in order to supplement wild stocks and improve economic profit. For investigation of the effects of stock enhancement in Jinzhou Bay, we traced this program by sampling 574 female shrimp after spawning and recaptured 293 individuals post-release. Among recaptured individuals, 21 were identified as being hatchery-raised via mtDNA control region and six microsatellite markers identification, accounting for 7.2%, indicating that the hatchery-released juvenile shrimps could survive in the natural environment and contribute to F. chinensis population replenishment in the wild. To address genetic impacts from stock enhancement, we compared the genetic variations between spawners used for enhancement release and local recaptured individuals. High genetic diversities were maintained in F. chinensis stocks, but local recaptured individual stock seemed to exhibit lower genetic diversity. Deviation from Hardy–Weinberg equilibrium and positive values in the inbreeding coefficient in all microsatellite loci and stocks indicated that homogenization and inbreeding may have occurred. More appropriate strategies to restore F. chinensis populations should be discussed for future fishery management.

Toxicological responses of juvenile Chinese shrimp Fenneropenaeus chinensis and swimming crab Portunus trituberculatus exposed to cadmium

Cadmium (Cd) is one of the typical metal pollutants in the Bohai Sea. To evaluate the acute toxicological effects of Cd on marine crustaceans, juvenile Fenneropenaeus chinensis and Portunus trituberculatus were exposed to Cd at environmentally relevant concentrations (5 and 50 μg/L) for 96 h. Cd accumulation, antioxidants and metabolite profiles were characterized to elucidate the responses of juvenile crustaceans to Cd stress. Significant Cd accumulation was observed in both juvenile crustaceans in 50 μg/L Cd-treated group. Results showed that Cd exposure induced hormesis based on the alterations of GSH, SOD and CAT activities (i.e. increased levels in the low concentration of Cd treatment and recovered levels in the high concentration of Cd treatment) in juvenile P. trituberculatus. Similarly, the responses of GSH contents presented hormesis pattern in Cd-treated juvenile F. chinensis. Na+-K+-ATPase contents were significantly elevated in 50 μg/L Cd-treated group. In addition, untargeted NMR-based metabolomics indicated Cd caused the disturbance in osmotic regulation and energy consumption in both juvenile F. chinensis and P. trituberculatus via different pathways. The immunotoxicity and movement disorder were uniquely demonstrated in juvenile P. trituberculatus after Cd exposure.

Comparative transcriptomic analysis of Chinese shrimp Fenneropenaeus chinensis infected with white spot syndrome virus

White spot syndrome virus (WSSV) is one of the most lethal viruses in shrimp aquaculture. Compared with other shrimp species, the Chinese shrimp (Fenneropenaeus chinensis) is more susceptible to WSSV. The mortality of WSSV-infected F. chinensis can reach 100% within a week. No effective solution currently exists to solve the WSSV problem in F. chinensis aquaculture. After years of research, we found that individual F. chinensis from the same family can carry different viral load at the same time post-WSSV infection. To better understand the anti-WSSV mechanism of F. chinensis, we analysed the transcriptomic data from F. chinensis with high and low WSSV load at the same time post-WSSV infection and from healthy F. chinensis, in a WSSV-resistant group and a WSSV-susceptible group, respectively. We identified more differentially expressed genes in F. chinensis with high WSSV load than in those with low WSSV load at the same time post-WSSV infection. Many differentially expressed genes were enriched in Gene Ontology terms related to binding function and the extracellular matrix-receptor interaction pathway, which might play important roles in the anti-WSSV processes among F. chinensis.

Comparative proteomic profiling in Chinese shrimp Fenneropenaeus chinensis under low pH stress

Lower pH gives rise to a harmful stress to crustacean. Here, we analyzed the proteomic response of Fenneropenaeus chinensis from control pH (pH value 8.2) and low pH (pH value 6.5) - treated groups by employing absolute quantitation-based quantitative proteomic (iTRAQ) analysis. Among the identified proteins, a total of 76 proteins differed in their abundance levels, including 45 upregulated and 31 downregulated proteins. The up-regulation of proteins like citrate synthase, cytochrome c oxidase, V-type proton ATPase, glyceraldehyde-3-phosphate dehydrogenase and fructose 1,6-bisphosphate-aldolase as well as the enrichment of the DEPs in multiple metabolic processes and pathways illustrated that increased energy and substrates metabolism was essential for F. chinensis to counteract low pH stress. Ion transporting related proteins, such as Na+/K+/2Cl− cotransporter and calmodulin, participated in the homeostatic maintenance of pH in F. chinensis. There were significant downregulation expressions of lectin, lipopolysaccharide- and beta-1,3-glucan binding protein, chitinase, cathepsin L and beta-glucuronidase, which indicating the immune dysfunction of F. chinensis when exposure to low pH condition. These findings can extend our understanding on the defensive mechanisms of the low pH stress and accelerate the breeding process of low pH tolerance in F. chinensis.

Improved genome assembly of Chinese shrimp (Fenneropenaeus chinensis) suggests adaptation to the environment during evolution and domestication

A high-quality reference genome is necessary to determine the molecular mechanisms underlying important biological phenomena; therefore, in the present study, a chromosome-level genome assembly of the Chinese shrimp Fenneropenaeus chinensis was performed. Muscle of a male shrimp was sequenced using PacBio platform, and assembled by Hi-C technology. The assembled F. chinensis genome was 1.47Gb with contig N50 of 472.84Kb, including 57.73% repetitive sequences, and was anchored to 43pseudochromosomes, with scaffold N50 of 36.87Mb. In total, 25,026 protein-coding genes were predicted. The genome size of F. chinensis showed significant contraction in comparison with that of other penaeid species, which is likely related to migration observed in this species. However, the F. chinensis genome included several expanded gene families related to cellular processes and metabolic processes, and the contracted gene families were associated with virus infection process. The findings signify the adaptation of F. chinensis to the selection pressure of migration and cold environment. Furthermore, the selection signature analysis identified genes associated with metabolism, phototransduction, and nervous system in cultured shrimps when compared with wild population, indicating targeted, artificial selection of growth, vision, and behavior during domestication. The construction of the genome of F. chinensis provided valuable information for the further genetic mechanism analysis of important biological processes, and will facilitate the research of genetic changes during evolution.

Comparative proteomic and transcriptomic analysis reveals high pH-induced expression signatures of Chinese shrimp Fenneropenaeus chinensis.

pH has a great impact on the distribution, growth, behavior, and physiology in many aquatic animals. The comparison of proteomics between normal and high pH stress samples was successfully achieved using iTRAQ proteomic analysis to screen key response proteins and pathways. After high pH stress, 124 upregulated and 41 downregulated proteins were identified. The higher expression levels of proteins like citrate synthase, glutathione S-transferase, glutathione peroxidase, and cytochrome c oxidase are associated with oxidative stress and mitochondrial dysfunction. The upregulation of glucose-regulated protein 78 indicated that the endoplasmic reticulum stress is induced by high pH stress. There were significant upregulation expressions of V-type H+-ATPase, Na+, K+-ATPase, 14-3-3 protein, as well as ATP-binding cassette transmembrane transporters after high pH exposure, which indicating their important roles in response to high pH stress. The abundance of proteins involved in protein glycosylation, oxidative pentose phosphate pathway, protein export, and glutathione metabolism were found enriched in high pH group than in control group. Quantitative proteomic profiling and integrated analysis with transcriptomic data provide new insights into the mechanisms underlying the molecular response to high pH stress in Fenneropenaeus chinensis.

Research in migration route of hatchery released Chinese shrimp (Fenneropenaeus chinensis) in the Bohai Bay using method of SSR marker

This study provides new insights for the hatchery released Chinese shrimp (Fenneropenaeus chinensis), including proportion, dynamic migration route, after they were released into nature for stock enhancement using a new strategy quite different than ever. Chinese shrimp were sampled at 22 survey stations during two investigation voyages acrossing 74 survey stations in the Bohai Sea from July 16 to August 9 in 2015. Among 289 sampled individuals during the second voyage, totally 155 shrimps were identified as hatchery shrimp released into the Laizhou Bay at mid-May in 2015 based on finger-print of eight SSR (simple sequence repeats) markers, and the proportion of hatchery released shrimp in recapture samples were from 41.30%–85.71% in each station with an average value 53.63%, which verified a previous view point that up to 90% of autumn season Chinese shrimp landing in the Bohai Sea were composed of hatchery released. Meanwhile, the dynamic migration route of hatchery released shrimp revealed that part of released shrimp migrated heading northwest along the west coast of the Bohai Sea up to the Bohai Bay but just remained at the Laizhou Bay until over-wintering migration at mid-October when they initiate over-wintering migration. Present unnatural spring season shrimp fishing model cut the throat of spawner shrimp chance to swim back to their respective spawning plants at each spring, it still no chance to clarify whether the hatchery released shrimp could replenish to the reproduce population and complete a whole life cycle as same as their natural relatives.

Novel derivatives of salicylanilide: Synthesis, characterization, PPO inhibitory activity and cytotoxicity

Two series of novel salicylanilide analogues (4a-4 g) and (4h-4t) were designed, synthesized, and characterized, especially the structure of compound 4q was further confirmed by single X-ray diffraction. The inhibitory activity on polyphenoloxidase (PPO) from the cephalothorax of Chinese white shrimp (Fenneropenaeus chinensis) was evaluated. The result indicated that all the synthesized derivatives (except 4 g and 4t) exhibited moderate PPO inhibitory properties having IC50 values in the range of 0.21 ± 0.19 to 4.32 ± 0.53 mM, whereas reference inhibitor salicylic acid and 3a have IC50 values 3.93 ± 0.43 mM and 12.83 ± 0.51 mM, respectively. Specifically, 4-nitro-benzoic acid 3-(2‑hydroxy‑benzoylamino)- propyl ester (4q) exhibited the most potent PPO inhibitory activity with an IC50 value of 0.21 ± 0.19 mM. The kinetic studies of the compound (4q) demonstrated that the inhibitory effects of the compound on the PPO were belonging to competitive inhibitors. Meanwhile, the structure-activity relationship was discussed. Therefore, compound 4q could act as a PPO inhibitor with anti-browning and antimicrobial properties to be applied in the food industry.

Pathogenicity of a Vibrio owensii strain isolated from Fenneropenaeus chinensis carrying pirAB genes and causing AHPND

An emergent shrimp disease, acute hepatopancreatic necrosis disease (AHPND), has been causing great economic losses to the shrimp farming industry. The original causing agent of AHPND was regarded as Vibrio parahaemolyticus, with a plasmid named pVA1 carrying two Photorhabdus insect-related (Pir) toxin genes pirA and pirB. In the present study, a Vibrio owensii strain named FcYS03 was isolated from the Chinese shrimp Fenneropenaeus chinensis, which caused a high mortality in shrimp with typical AHPND signs. This strain carried the binary toxin genes pirAB and could cause AHPND both in Fenneropenaeus chinensis and Penaeus vannamei (previously named Litopenaeus vannamei). The pathogenicity of FcYS03 to P. vannamei exhibited apparent temperature and salinity dependence. Through genome sequence analysis among FcYS03 and AHPND-causing V. parahaemolyticus strain 3HP, we found that a segmental rearrangement phenomenon existed in the plasmid of FcYS03. The toxin genes pirAB happened to be located at the rearranged segment, and two transposases for transposon Tn903 were distributed at the two ends of the rearranged segment, which indicated that transposon Tn903 might be related to the transfer of the toxin genes among the bacteria. The study will provide valuable information for the understanding and prevention of AHPND in shrimp aquaculture.

Integrative phenotypic and gene expression data identify myostatin as a muscle growth inhibitor in Chinese shrimp Fenneropenaeus chinensis

Growth traits, largely determined by muscle growth, are the most critical economic traits in shrimp breeding. Myostatin (Mstn) is a conserved inhibitor of muscle growth in vertebrates, but until now solid evidence supporting a similar function of Mstn in invertebrates has been lacking. In the present study, we examined the Mstn expression along with growth trait data in a Fenneropenaeus chinensis population, to establish a potential correlation between Mstn and growth. The heritabilities of FcMstn expression, body weight at 190 days of culture, body weight and length at 230 days of culture, and average daily gain were estimated using 773 individuals and a thirteen-generation pedigree. The results showed FcMstn expression was negatively correlated with the growth traits, and the mean FcMstn expression in females was significantly lower than that of males, indicating Mstn negatively regulates muscle growth in shrimp, and its lower expression may underscore the faster growth of females. Low heritabilities were detected for FcMstn expression, suggesting that the expression of Mstn might be heritable in shrimp. These results provide strong support for a growth inhibitory function of Mstn in F. chinensis, and suggest a potential method for selective breeding of this species without substantial experimental resources and labor force.

Genetic diversity status and conservation priority of hatchery-produced offspring populations of Fenneropenaeus chinensis by microsatellite DNA

The Chinese shrimp Fenneropenaeus chinensis is an important economic species in China. To evaluate the genetic diversity of hatchery-produced offspring of F. chinensis, 15 populations were collected from three provinces in China and analysed using nine microsatellite DNA loci. High values for expected and observed heterozygosity (He and Ho respectively), as well as for polymorphism information content (PIC), were obtained (He=0.845–0.905, Ho=0.507–0.766, PIC=0.834–0.891), and no loss of genetic variability was detected in F. chinensis in this study. The genetic differentiation among 15 populations was small, suggesting genetic homogeneity among hatchery-produced offspring. The results of the present study indicate that the most immediate and effective conservation priority for F. chinensis in Chinese coastal waters should be maintaining the current genetic diversity. Genetic monitoring should be performed to maintain an effective population size and avoid loss of genetic diversity.

Genetic evaluation of Chinese shrimp (Fenneropenaeus chinensis) stock enhancement in the Yellow Sea and Bohai Sea based on mitochondrial DNA control region

Stock enhancement is a fishery management approach involving the release of hatchery organisms to increase the abundance of natural fish or invertebrate population. In this study, genetic evaluation of Fenneropenaeus chinensis stock enhancement was carried out based on the mitochondrial DNA control region. The haplotype diversity (Hd) and nucleotide diversity (π) of broodstock populations were generally higher than that of recaptured populations. The molecular variance analysis (AMOVA) results demonstrated that genetic variance was in connection with the time of releasing and recapture. A significant pairwise FST value was only obtained between L1CY and C2LZ. But there was no obvious correlation between their geographical distance and genetic difference, confirming that time factor might be the leading cause of differences. Haplotypes shared by more than three individuals all could be recaptured, which indicated that the enhancement experiment was relatively successful. In general, the enhancement effect in 2012 was better than that of in 2013.

Evaluation of metal pollution-induced biological effects in Chinese shrimp Fenneropenaeus chinensis by NMR-based metabolomics

Metal pollution in Laizhou Bay along the Bohai Sea in China has been posing a risk on fishery species and hence may affect seafood quality. In this work, shrimps Fenneropenaeus chinensis were sampled from three sites, namely, a reference (site 6334) and two metal-polluted (sites 6262 and 7262) sites, located in Laizhou Bay. The metal concentrations in shrimp muscle tissues were tested using the ICP-MS technique. The Cr and Cu concentrations were the highest in the shrimp samples from site 7262, exceeding the national seafood safety standard Ⅱ, and the As concentration was much higher than the national seafood safety standard Ⅲ. NMR-based metabolomics indicated that metal pollution induced oxidative and immune stresses, damaged the muscular structure, and disrupted energy metabolism in shrimps at sites 6262 and 7262, in particular disturbed osmotic regulation in shrimps at site 7262. Glycine and serine could serve as biomarkers for Cd in F. chinensis.