Herein,a first example of energetic-energetic cocrystal polymorphs with a 1:1 M ratio was discovered by cocrystallizing CL-20(2,4,6,8,10,12-hexanitro-2,4,6,8,10,12-hexaazaisowurtzitane)with 1,3-DNP(1,3-dinitropyrazole...Herein,a first example of energetic-energetic cocrystal polymorphs with a 1:1 M ratio was discovered by cocrystallizing CL-20(2,4,6,8,10,12-hexanitro-2,4,6,8,10,12-hexaazaisowurtzitane)with 1,3-DNP(1,3-dinitropyrazole).These two energetic cocrystal polymorphs(cocrystal 1 and cocrystal 2)exhibit distinct crystal packing styles,which lead to significant variations in their physicochemical properties.Notably,cocrystal 2 has a high density of 1.963 g·cm^(-3)at 170 K,exhibiting high detonation performances(9187 m·s^(-1);38.68 GPa)comparable to HMX(1,3,5,7-tetranitro-1,3,5,7-tetrazocane)meanwhile displaying an improved safety(10 J)relative to RDX(1,3,5-trinitro-1,3,5-triazinane),making it a potential high-energy,low-sensitivity energetic material.This work opens up a new strategy to deeply tune properties of energetic materials by constructing energetic-energetic cocrystal polymorphs.These energetic cocrystal polymorphs represent a new field of energetic materials that has not yet been studied.展开更多
Simple cubic black phosphorus(BP)has been recognized as a strategic material due to its exceptional structural stability under extreme conditions.In this investigation,simple cubic BP was successfully synthesized thro...Simple cubic black phosphorus(BP)has been recognized as a strategic material due to its exceptional structural stability under extreme conditions.In this investigation,simple cubic BP was successfully synthesized through shock-induced phase transformation,utilizing amorphous red phosphorus as the precursor material.The phase evolution process was systematically investigated using plane shock loading apparatus,with shock pressure and temperature parameters being precisely controlled to optimize transformation kinetics.Comprehensive phase characterization revealed the correlation between thermodynamic loading profiles and cubic BP formation efficiency.Precursor modification strategies were implemented through orthorhombic BP utilization,resulting in enhanced cubic phase yield and crystallinity.The synthesized cubic BP variants are considered promising candidates for advanced protective material systems,particularly where combinations of mechanical resilience and thermal stability are required under extreme operational conditions.This research provides critical insights into shock-induced phase transformation mechanics,while establishing foundational protocols for manufacturing non-equilibrium materials with potential applications in next-generation defensive technologies.展开更多
Objective To evaluate the association of GGN repeat polymorphism of androgen receptor(AR)with ovarian reserve and ovarian response in controlled ovarian stimulation(COS).Methods This genetic association study was cond...Objective To evaluate the association of GGN repeat polymorphism of androgen receptor(AR)with ovarian reserve and ovarian response in controlled ovarian stimulation(COS).Methods This genetic association study was conducted among a total of 361 women aged≤40 years with basal FSH≤12 U/L undergoing the GnRH-agonist long protocol for COS in a university affiliated IVF center.GGN repeat in the AR gene was analyzed with Sanger sequencing.The primary endpoint was the number of antral follicle counts(AFCs),and the secondary endpoints were stimulation days,total dose of gonadotropin(Gn)used,total number of retrieved oocytes,ovarian sensitivity index,and follicular output rate.Results The GGN repeat in exon 1 of the AR gene ranged from 13 to 24,and the median repeat length was 22.Based on the genotypes(S for GGN repeats<22,L for GGN repeats≥22),the patients were divided into 3 groups:SS,SL,and LL.Generalized regression analysis indicated that the number of AFCs in group SS was significantly lower than those in group SL(adjusted β=1.8,95%CI:0.2-3.4,P=0.024)and group LL(adjusted β=1.5,95%CI:0.2-2.7,P=0.021).No significant difference was observed in the number of AFCs between group SL and group LL(P>0.05).Generalized regression analysis indicated no significant differences in ovarian stimulation parameters among the 3 groups,either before or after adjusting for confounding factors(P>0.05).Conclusion GGN repeat length on the AR gene is associated with AFC but not with ovarian response in Chinese women,indicating that AR gene polymorphisms may affect ovarian reserve.展开更多
OBJECTIVE To enhance the quality and efficiency of chlorogeninc acid by investigating the differences among the chlorogeninc acid polymorphs in bioavailability and solubility.METHODS Determinative method was used to a...OBJECTIVE To enhance the quality and efficiency of chlorogeninc acid by investigating the differences among the chlorogeninc acid polymorphs in bioavailability and solubility.METHODS Determinative method was used to analyze the solubility of chlorogeninc acid polymorphs;solid chlorogeninc acid in different forms were orally administered to the rats,and a HPLC method was established to determinate plasma lever of metabolite-acyclovir and the bioavailability was analyzed.RESULTS The indirect pharmacokinetic parameters of Chlorogeninc acid,as the metabolites of the form Ⅰ,Ⅱ,Ⅲ,were as follows:cmaxwas 0.37,0.34 and 0.44mg·L-1,respectively;AUC0→twas 0.71,0.76 and 0.79mg·L-1·h,respectively.CONCLUSION The solubility of form Ⅲ was larger than the other forms′.The solubility of Chlorogeninc acid polymorphs:form Ⅰ,form Ⅱ,form Ⅲ were merely the same,there was no statistically significant difference in pharmacokinetic parameters among these three forms.展开更多
A seeding strategy was developed in the preparation of cyclotetramethylenetetranitramine(HMX)explosive micro-particles by solvent-antisolvent method, to control their polymorphs from dangerous gamma(y) type to the des...A seeding strategy was developed in the preparation of cyclotetramethylenetetranitramine(HMX)explosive micro-particles by solvent-antisolvent method, to control their polymorphs from dangerous gamma(y) type to the desired and standard beta(β) form with the size distribution of <10.0 μm, by using a low concentration of β-HMX fine particles as micro-seed in the antisolvent medium. All products were characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM), and dynamic light scattering particle size analyzer. In the next step, the effective factors on the sizes and morphologies of micro-particles in the presence and absence of two soft templates of poly(ethylene glycol)-400(PEG-400) polymer and coconut fatty acid diethanolamide(lauramide) surfactant were investigated. The results of experiments showed that using of water-soluble PEG-400 in the low antisolvent temperatures leads to the production of very spherical particles. Also non-ionic surfactant of lauramide, direct the crystal growth to needle-like structures. The advantages of this method are its capability for the simple production of β-HMX micro-particles in the large scale production process, with the various crystal structures and particles size distributions.展开更多
The follicle stimulating hormone beta-subunit （FSHβ） gene plays an important role in piglets. Marker-assisted selection （MAS） in conjunction with traditional selection methods is most effective for improving the ...The follicle stimulating hormone beta-subunit （FSHβ） gene plays an important role in piglets. Marker-assisted selection （MAS） in conjunction with traditional selection methods is most effective for improving the piglets breeding traits. To find the new SNPs, the polymorphism of it in six pig breeds （Min, Landrace, Yorkshine, Duroc, wild boar, and wild boar × Landrace） was analyzed by using PCR-SSCP and was further compared with each other. Polymorphism was found and the sequencing results showed that there was one silent mutation on exon2 （C48T） and two mutations on exon3 （T422C and A514G）. Genotype distribution of FSHβ in Min and wild boar on exon3 was in accordance with Hardy-Weinberg Law.展开更多
Di-n-butyl phthalate (DBP),one of phthalate acid esters (PAEs),was investigated to determine its biodegradation rate using Xiangjiang River sediment and find potential DBP degraders in the enrichment culture of the se...Di-n-butyl phthalate (DBP),one of phthalate acid esters (PAEs),was investigated to determine its biodegradation rate using Xiangjiang River sediment and find potential DBP degraders in the enrichment culture of the sediment. The sediment sample was incubated with an initial concentration of DBP of 100 mg/L for 5 d. The biodegradation rate of DBP was detected using HPLC and the degraded products were analyzed by GC/MS. Subsequently,the microbial diversity of the enrichment culture was analyzed by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP). The results reveal that almost 100% of DBP is degraded after merely 3 d,generating two main degraded products:mono-butyl phthalate (MBP) and 9-octadecenoic acid. After a six-month enrichment period under the pressure of DBP,the dominant family in the final enrichment culture is clustered with the Comamonas sp.,the remaining are affiliated with Sphingomonas sp.,Hydrogenophaga sp.,Rhizobium sp.,and Acidovorax sp. The results show the potential of these bacteria to be used in the bioremediation of DBP in the environment.展开更多
谷氨酸棒杆菌是食品安全级菌株,可作为生产高价值产物的优良底盘细胞用于工业生产。它具有良好的分泌系统,是表达重组蛋白的潜在宿主,有极大的研究价值。为优化底盘细胞提高其蛋白表达能力,挖掘并验证谷氨酸棒杆菌中与外源蛋白高表达相...谷氨酸棒杆菌是食品安全级菌株,可作为生产高价值产物的优良底盘细胞用于工业生产。它具有良好的分泌系统,是表达重组蛋白的潜在宿主,有极大的研究价值。为优化底盘细胞提高其蛋白表达能力,挖掘并验证谷氨酸棒杆菌中与外源蛋白高表达相关的基因。在谷氨酸棒杆菌重测序的基础上,应用生物信息学对单核苷酸多态性(single-nucleotide polymorphisms,SNP)基因进行挖掘,分析基因保守结构域。通过构建SNP基因过表达和敲除重组菌株,评估其生长情况以及增强型绿色荧光蛋白(enhanced green fluorescence protein,EGFP)和人重组特立帕肽(recombinant human teriparatide,rtPTH)的外源蛋白表达能力。分析并整理了高产量外源蛋白菌株的重测序数据,共有33个SNP突变位点,主要涉及5个基因。其中SNP重组菌株over-2370和ko-973-974的荧光值最高,并且发酵生产rtPTH,均比野生型(wild type,WT)提高了近1倍。该研究成功挖掘出与蛋白表达相关的基因GL002370和GL000974,这些发现将有助于获得优化的底盘细胞,并为深入研究增加蛋白产量的靶基因提供指导。展开更多
Background and objective:Lung cancer is one of the malignant tumors.Gene mutations associated with cellular immune function and regulating the activation and proliferation of immune cells.Several publications have exp...Background and objective:Lung cancer is one of the malignant tumors.Gene mutations associated with cellular immune function and regulating the activation and proliferation of immune cells.Several publications have explored the relationship between cytotoxic T lymphocyte antigen-4(CTLA-4)+49 adenine(A)/guanine(G)polymorphism and susceptibility of lung cancer,but the results remain controversial.Thus,we performed this meta-analysis to derive a more comprehensive estimation of the relationship.Methods:All articles addressed lung cancer and polymorphisms of CTLA-4 were searched from the Pub Med,EMBASE databases published up to June 29,2019.Odds ratios(ORs)with 95%confidence intervals(CIs)were used to assess the strength of association.Publication bias of relevant studies was examined via Begg’s test and funnel plots.Results:The meta-analysis included 8 case-control studies covering 4,430 lung cancer patients and 5,198 healthy controls from September 2008 to April 2020.The overall eligible data indicated that CTLA-4+49 A/G polymorphisms did not correlate with the elevated lung cancer risk in all genetic comparison models(dominant model:OR=1.037,95%CI:0.925-1.161;recessive model:OR=0.968,95%CI:0.888-1.055;allele model:OR=0.992,95%CI:0.933-1.054;homozygous model:OR=0.980,95%CI:0.857-1.121;heterozygous model:OR=1.023,95%CI:0.906-1.154).In further stratified analyses,CTLA-4+49 A/G polymorphism was found to be significantly associated with susceptibility to NSCLC in these models(dominant model:OR=1.404,95%CI:1.074-1.836;allele model:OR=1.273,95%CI:1.034-1.565;homozygous model:OR=1.553,95%CI:1.044-2.310;heterozygous model:OR=1.308,95%CI:1.062-1.611).Conclusion:CTLA-4+49 A/G polymorphism were not associated with the risk of lung cancer but might be a risk factor only in NSCLC.展开更多
Objective:To investigate the association between the polymorphism of HLA-A,HLA-B genes and pre-eclampsia. Methods:HLA-A,HLA-B genotyping was performed by polymerase chain reaction sequence-specific primer (PCR-SSP) in...Objective:To investigate the association between the polymorphism of HLA-A,HLA-B genes and pre-eclampsia. Methods:HLA-A,HLA-B genotyping was performed by polymerase chain reaction sequence-specific primer (PCR-SSP) in 119 preeclampsia patients,117 normal pregnant women and their neonates. Results:The study showed that 16 HLA-A and 39 HLA-B alleles were obtained in pre-eclamptic patients and normal pregnant women. 15 HLA-A and 37 HLA-B alleles were obtained in their neonates. No significant difference was found in maternal or neonatal HLA-A,HLA-B alleles between pre-eclampsia group and control group (P_(c)>0.05). The frequencies of HLA-A11,HLA-A24,HLA-B13,HLA-B14,HLA-B15,HLA-B52 maternal/fetus genetic assoications were significantly diffe-rent between pre-eclampsia group and control group (P<0.05). Conclusion:Some HLA-A,HLA-B maternal/fetus special bindings may be associated with the susceptibility or protective of pre-eclampsia.展开更多
Based on chicken＇ consensus map issued in 2000, 17 microsatellites near 4 candidate genes such as IGF2, OBR, GDF8 and APOA 1 in 4 chromosomes （chromosome 5, 7, 8 and 24） were chosen for polymorphism analysis and co...Based on chicken＇ consensus map issued in 2000, 17 microsatellites near 4 candidate genes such as IGF2, OBR, GDF8 and APOA 1 in 4 chromosomes （chromosome 5, 7, 8 and 24） were chosen for polymorphism analysis and construction of linkage map. Combining the technique of PCR and the fluorescent semi-automated detection, genome scanning was performed for 440 chickens, which was derived from China Agricultural University chicken resource families within three generations. The individuals of this resource families were genotyped. The results showed that the number of alleles ranged from 4 to 14; heterozygosity （H） of markers was between 0.3116 and 0.9148. Polymorphic information content （PIC） varied from 0.2672 to 0.8679. Microsatellites along with above-mentioned 4 candidate genes doing as general markers were used to construct linkage map. The spans of 4 linkage maps constructed in the part region of chromosome 5, 7, 8 and 24 were 263.5, 79.9, 206.2 and 104.2 cM, respectively. The order of markers was consistent with that of counterpart of reported consensus map. However, The spans of linkage map were larger than that of consensus map. The constructed linkage maps laid the foundation for mapping quantitative trait loci （QTL） responsible for economically important traits in chicken.展开更多
Reproduction trait plays an important role in pig production. Identification of molecular markers that are linked to litter size may contribute to the genetic development of porcine reproduction traits. In this study,...Reproduction trait plays an important role in pig production. Identification of molecular markers that are linked to litter size may contribute to the genetic development of porcine reproduction traits. In this study, porcine ring finger protein 4 （pRNF4） and Matrix metalloproteinase 9 （pMMP-9） were selected as candidate genes on the basis of their physiological roles in reproduction. Two single-nucleotide polymorphisms （416C〉T in pRNF4 and - 1257G〉A in pMMP-9） that could be detected by PCR restriction fragment length polymorphism （PCR-RFLP） were discovered and tested for statistical associations with litter size traits in three populations. For 416C〉T, TT genotype was associated with a significantly higher （p〈0.05） number of live births than those recorded for CC sows and the additive effect was significant （p〈0.05） in Qingping and Min Pigs populations in later parities. For -1257G〉A, inconsistent results were found in three populations. The results suggested that T allele in pRNF4 gene might confer a high prolificacy in breeding and further studies were needed to confLrm the results.展开更多
Objective Tacrolimus is an immunosuppressive drug with narrow therapeutic range and wide interindividual variation in its pharmacokinetics.Tacrolimus is a substrate of cytochrome P450(CYP)3A5.The aim of this study was...Objective Tacrolimus is an immunosuppressive drug with narrow therapeutic range and wide interindividual variation in its pharmacokinetics.Tacrolimus is a substrate of cytochrome P450(CYP)3A5.The aim of this study was to evaluate whether the A6986G polymorphism is associated with tacrolimus concentration/dose ratio.Methods Fifty-two Chinese renal transplant patients were enrolled in this study.Their body weight,dosage and concentration of tacrolimus were observed.CYP3A5 genotype was determined by polymerase chain reaction followed by restriction fragment length polymorphism analysis.Results A significant association was found between tacrolimus levels per dose/kg/d and CYP3A5 gene A6986G polymorphism(P<0.001).The CYP3A5*3*3 patients have a significantly higher tacrolimus level/dose than CYP3A5*1*1 and CYP3A5*1*3.Conclusions CYP3A5 gene A6986G polymorphism is associated with tacrolimus pharmacokinetics and dose requirements.Pharmacogenetic methods could be employed prospectively to help the dose selection and to individualize immunosuppressive therapy according to the result.展开更多
To screen genetic polymorphisms of Panax ginseng, as well as those of Panax quinquefolium and Panax notoginseng, analysis of random amplified polymorphic DNA （RAPD） was performed using 120 random primers. Of the suc...To screen genetic polymorphisms of Panax ginseng, as well as those of Panax quinquefolium and Panax notoginseng, analysis of random amplified polymorphic DNA （RAPD） was performed using 120 random primers. Of the successful amplicons obtained, the Panax ginseng-specific RAPD marker C-12 was cloned into a TA vector and sequenced （Genl3ank access number KU553472）. Based on the sequence analysis results, a pair of primers specific to C-12 was designed. Finally, a SCAR marker-based identification system for Panax ginseng was developed after optimization of the reaction conditions. Using this method, two positive bands were stably observed at 300 bp and 130 bp in 33 batches of Panax ginseng samples tested, while negative results were obtained for another 101 batches of samples, including Panax quinquefolium, Panax notoginseng, adulterants, and other medicinal herbs. Thus, we successfully developed a PCR-based method for rapid and effective identification of Panax ginseng, which can be effectively used for the protection and utilization of germplasm resources and identification of the origins of Panax ginseng samples.展开更多
基金support for this study by the National Natural Science Foundation of China(Grant No.22275175)。
文摘Herein,a first example of energetic-energetic cocrystal polymorphs with a 1:1 M ratio was discovered by cocrystallizing CL-20(2,4,6,8,10,12-hexanitro-2,4,6,8,10,12-hexaazaisowurtzitane)with 1,3-DNP(1,3-dinitropyrazole).These two energetic cocrystal polymorphs(cocrystal 1 and cocrystal 2)exhibit distinct crystal packing styles,which lead to significant variations in their physicochemical properties.Notably,cocrystal 2 has a high density of 1.963 g·cm^(-3)at 170 K,exhibiting high detonation performances(9187 m·s^(-1);38.68 GPa)comparable to HMX(1,3,5,7-tetranitro-1,3,5,7-tetrazocane)meanwhile displaying an improved safety(10 J)relative to RDX(1,3,5-trinitro-1,3,5-triazinane),making it a potential high-energy,low-sensitivity energetic material.This work opens up a new strategy to deeply tune properties of energetic materials by constructing energetic-energetic cocrystal polymorphs.These energetic cocrystal polymorphs represent a new field of energetic materials that has not yet been studied.
基金supported by the Youth Project of the Independent Subject of the State Key Laboratory of Explosion Science and Safety Protection,Beijing Institute of Technology(Grant Nos.QNKT25-13 and QNKT24-02)the 76th batch of Project funded by China Postdoctoral Science Foundation(Grant No.2024M764116)+3 种基金the National Natural Science Foundation of China(Grant Nos.12002048,12072037,12102050,and 12202067)the Science and Technology Commission,China(Grant No.2019-jcjc-zd-011-00)the Project supported by the Open Funds of Kui Yuan Laboratory(Grant No.KY202431)the State Key Laboratory of Explosion Science and Safety Protection(Grant No.KFJJ25-21M)。
文摘Simple cubic black phosphorus(BP)has been recognized as a strategic material due to its exceptional structural stability under extreme conditions.In this investigation,simple cubic BP was successfully synthesized through shock-induced phase transformation,utilizing amorphous red phosphorus as the precursor material.The phase evolution process was systematically investigated using plane shock loading apparatus,with shock pressure and temperature parameters being precisely controlled to optimize transformation kinetics.Comprehensive phase characterization revealed the correlation between thermodynamic loading profiles and cubic BP formation efficiency.Precursor modification strategies were implemented through orthorhombic BP utilization,resulting in enhanced cubic phase yield and crystallinity.The synthesized cubic BP variants are considered promising candidates for advanced protective material systems,particularly where combinations of mechanical resilience and thermal stability are required under extreme operational conditions.This research provides critical insights into shock-induced phase transformation mechanics,while establishing foundational protocols for manufacturing non-equilibrium materials with potential applications in next-generation defensive technologies.
文摘Objective To evaluate the association of GGN repeat polymorphism of androgen receptor(AR)with ovarian reserve and ovarian response in controlled ovarian stimulation(COS).Methods This genetic association study was conducted among a total of 361 women aged≤40 years with basal FSH≤12 U/L undergoing the GnRH-agonist long protocol for COS in a university affiliated IVF center.GGN repeat in the AR gene was analyzed with Sanger sequencing.The primary endpoint was the number of antral follicle counts(AFCs),and the secondary endpoints were stimulation days,total dose of gonadotropin(Gn)used,total number of retrieved oocytes,ovarian sensitivity index,and follicular output rate.Results The GGN repeat in exon 1 of the AR gene ranged from 13 to 24,and the median repeat length was 22.Based on the genotypes(S for GGN repeats<22,L for GGN repeats≥22),the patients were divided into 3 groups:SS,SL,and LL.Generalized regression analysis indicated that the number of AFCs in group SS was significantly lower than those in group SL(adjusted β=1.8,95%CI:0.2-3.4,P=0.024)and group LL(adjusted β=1.5,95%CI:0.2-2.7,P=0.021).No significant difference was observed in the number of AFCs between group SL and group LL(P>0.05).Generalized regression analysis indicated no significant differences in ovarian stimulation parameters among the 3 groups,either before or after adjusting for confounding factors(P>0.05).Conclusion GGN repeat length on the AR gene is associated with AFC but not with ovarian response in Chinese women,indicating that AR gene polymorphisms may affect ovarian reserve.
基金The project supported by the Ministry of Science and Technology of China(2007FY130100)the 12th Five-Year Plan project(2012ZX09301002-001-013)
文摘OBJECTIVE To enhance the quality and efficiency of chlorogeninc acid by investigating the differences among the chlorogeninc acid polymorphs in bioavailability and solubility.METHODS Determinative method was used to analyze the solubility of chlorogeninc acid polymorphs;solid chlorogeninc acid in different forms were orally administered to the rats,and a HPLC method was established to determinate plasma lever of metabolite-acyclovir and the bioavailability was analyzed.RESULTS The indirect pharmacokinetic parameters of Chlorogeninc acid,as the metabolites of the form Ⅰ,Ⅱ,Ⅲ,were as follows:cmaxwas 0.37,0.34 and 0.44mg·L-1,respectively;AUC0→twas 0.71,0.76 and 0.79mg·L-1·h,respectively.CONCLUSION The solubility of form Ⅲ was larger than the other forms′.The solubility of Chlorogeninc acid polymorphs:form Ⅰ,form Ⅱ,form Ⅲ were merely the same,there was no statistically significant difference in pharmacokinetic parameters among these three forms.
基金financial support of this work by Malek-ashtar University of Technology(I.R.Iran)Grant No.1395064
文摘A seeding strategy was developed in the preparation of cyclotetramethylenetetranitramine(HMX)explosive micro-particles by solvent-antisolvent method, to control their polymorphs from dangerous gamma(y) type to the desired and standard beta(β) form with the size distribution of <10.0 μm, by using a low concentration of β-HMX fine particles as micro-seed in the antisolvent medium. All products were characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM), and dynamic light scattering particle size analyzer. In the next step, the effective factors on the sizes and morphologies of micro-particles in the presence and absence of two soft templates of poly(ethylene glycol)-400(PEG-400) polymer and coconut fatty acid diethanolamide(lauramide) surfactant were investigated. The results of experiments showed that using of water-soluble PEG-400 in the low antisolvent temperatures leads to the production of very spherical particles. Also non-ionic surfactant of lauramide, direct the crystal growth to needle-like structures. The advantages of this method are its capability for the simple production of β-HMX micro-particles in the large scale production process, with the various crystal structures and particles size distributions.
基金Supported by National Key Technology R&D Program in the 11th Five Year Plan of China (2008BADB2B01)
文摘The follicle stimulating hormone beta-subunit （FSHβ） gene plays an important role in piglets. Marker-assisted selection （MAS） in conjunction with traditional selection methods is most effective for improving the piglets breeding traits. To find the new SNPs, the polymorphism of it in six pig breeds （Min, Landrace, Yorkshine, Duroc, wild boar, and wild boar × Landrace） was analyzed by using PCR-SSCP and was further compared with each other. Polymorphism was found and the sequencing results showed that there was one silent mutation on exon2 （C48T） and two mutations on exon3 （T422C and A514G）. Genotype distribution of FSHβ in Min and wild boar on exon3 was in accordance with Hardy-Weinberg Law.
基金Project(50621063) supported by the National Nature Science Foundation of ChinaProject(NCET-06-0691) supported by the Program for New Century Excellent Talents in University
文摘Di-n-butyl phthalate (DBP),one of phthalate acid esters (PAEs),was investigated to determine its biodegradation rate using Xiangjiang River sediment and find potential DBP degraders in the enrichment culture of the sediment. The sediment sample was incubated with an initial concentration of DBP of 100 mg/L for 5 d. The biodegradation rate of DBP was detected using HPLC and the degraded products were analyzed by GC/MS. Subsequently,the microbial diversity of the enrichment culture was analyzed by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP). The results reveal that almost 100% of DBP is degraded after merely 3 d,generating two main degraded products:mono-butyl phthalate (MBP) and 9-octadecenoic acid. After a six-month enrichment period under the pressure of DBP,the dominant family in the final enrichment culture is clustered with the Comamonas sp.,the remaining are affiliated with Sphingomonas sp.,Hydrogenophaga sp.,Rhizobium sp.,and Acidovorax sp. The results show the potential of these bacteria to be used in the bioremediation of DBP in the environment.
文摘谷氨酸棒杆菌是食品安全级菌株,可作为生产高价值产物的优良底盘细胞用于工业生产。它具有良好的分泌系统,是表达重组蛋白的潜在宿主,有极大的研究价值。为优化底盘细胞提高其蛋白表达能力,挖掘并验证谷氨酸棒杆菌中与外源蛋白高表达相关的基因。在谷氨酸棒杆菌重测序的基础上,应用生物信息学对单核苷酸多态性(single-nucleotide polymorphisms,SNP)基因进行挖掘,分析基因保守结构域。通过构建SNP基因过表达和敲除重组菌株,评估其生长情况以及增强型绿色荧光蛋白(enhanced green fluorescence protein,EGFP)和人重组特立帕肽(recombinant human teriparatide,rtPTH)的外源蛋白表达能力。分析并整理了高产量外源蛋白菌株的重测序数据,共有33个SNP突变位点,主要涉及5个基因。其中SNP重组菌株over-2370和ko-973-974的荧光值最高,并且发酵生产rtPTH,均比野生型(wild type,WT)提高了近1倍。该研究成功挖掘出与蛋白表达相关的基因GL002370和GL000974,这些发现将有助于获得优化的底盘细胞,并为深入研究增加蛋白产量的靶基因提供指导。
文摘Background and objective:Lung cancer is one of the malignant tumors.Gene mutations associated with cellular immune function and regulating the activation and proliferation of immune cells.Several publications have explored the relationship between cytotoxic T lymphocyte antigen-4(CTLA-4)+49 adenine(A)/guanine(G)polymorphism and susceptibility of lung cancer,but the results remain controversial.Thus,we performed this meta-analysis to derive a more comprehensive estimation of the relationship.Methods:All articles addressed lung cancer and polymorphisms of CTLA-4 were searched from the Pub Med,EMBASE databases published up to June 29,2019.Odds ratios(ORs)with 95%confidence intervals(CIs)were used to assess the strength of association.Publication bias of relevant studies was examined via Begg’s test and funnel plots.Results:The meta-analysis included 8 case-control studies covering 4,430 lung cancer patients and 5,198 healthy controls from September 2008 to April 2020.The overall eligible data indicated that CTLA-4+49 A/G polymorphisms did not correlate with the elevated lung cancer risk in all genetic comparison models(dominant model:OR=1.037,95%CI:0.925-1.161;recessive model:OR=0.968,95%CI:0.888-1.055;allele model:OR=0.992,95%CI:0.933-1.054;homozygous model:OR=0.980,95%CI:0.857-1.121;heterozygous model:OR=1.023,95%CI:0.906-1.154).In further stratified analyses,CTLA-4+49 A/G polymorphism was found to be significantly associated with susceptibility to NSCLC in these models(dominant model:OR=1.404,95%CI:1.074-1.836;allele model:OR=1.273,95%CI:1.034-1.565;homozygous model:OR=1.553,95%CI:1.044-2.310;heterozygous model:OR=1.308,95%CI:1.062-1.611).Conclusion:CTLA-4+49 A/G polymorphism were not associated with the risk of lung cancer but might be a risk factor only in NSCLC.
文摘Objective:To investigate the association between the polymorphism of HLA-A,HLA-B genes and pre-eclampsia. Methods:HLA-A,HLA-B genotyping was performed by polymerase chain reaction sequence-specific primer (PCR-SSP) in 119 preeclampsia patients,117 normal pregnant women and their neonates. Results:The study showed that 16 HLA-A and 39 HLA-B alleles were obtained in pre-eclamptic patients and normal pregnant women. 15 HLA-A and 37 HLA-B alleles were obtained in their neonates. No significant difference was found in maternal or neonatal HLA-A,HLA-B alleles between pre-eclampsia group and control group (P_(c)>0.05). The frequencies of HLA-A11,HLA-A24,HLA-B13,HLA-B14,HLA-B15,HLA-B52 maternal/fetus genetic assoications were significantly diffe-rent between pre-eclampsia group and control group (P<0.05). Conclusion:Some HLA-A,HLA-B maternal/fetus special bindings may be associated with the susceptibility or protective of pre-eclampsia.
基金Supported by Program for New Century Excellent Talents in University(NCET-04-0343)National Natural Science Foundation Key Project(30430510)Excellent Young Teachers Program of MOE.People's Republic of China(1985)
文摘Based on chicken＇ consensus map issued in 2000, 17 microsatellites near 4 candidate genes such as IGF2, OBR, GDF8 and APOA 1 in 4 chromosomes （chromosome 5, 7, 8 and 24） were chosen for polymorphism analysis and construction of linkage map. Combining the technique of PCR and the fluorescent semi-automated detection, genome scanning was performed for 440 chickens, which was derived from China Agricultural University chicken resource families within three generations. The individuals of this resource families were genotyped. The results showed that the number of alleles ranged from 4 to 14; heterozygosity （H） of markers was between 0.3116 and 0.9148. Polymorphic information content （PIC） varied from 0.2672 to 0.8679. Microsatellites along with above-mentioned 4 candidate genes doing as general markers were used to construct linkage map. The spans of 4 linkage maps constructed in the part region of chromosome 5, 7, 8 and 24 were 263.5, 79.9, 206.2 and 104.2 cM, respectively. The order of markers was consistent with that of counterpart of reported consensus map. However, The spans of linkage map were larger than that of consensus map. The constructed linkage maps laid the foundation for mapping quantitative trait loci （QTL） responsible for economically important traits in chicken.
基金Supported by the National Natural Science Foundation of China(31301935)Ph.D.Programs Foundation of Ministry of Education of China(20112325120013)
文摘Reproduction trait plays an important role in pig production. Identification of molecular markers that are linked to litter size may contribute to the genetic development of porcine reproduction traits. In this study, porcine ring finger protein 4 （pRNF4） and Matrix metalloproteinase 9 （pMMP-9） were selected as candidate genes on the basis of their physiological roles in reproduction. Two single-nucleotide polymorphisms （416C〉T in pRNF4 and - 1257G〉A in pMMP-9） that could be detected by PCR restriction fragment length polymorphism （PCR-RFLP） were discovered and tested for statistical associations with litter size traits in three populations. For 416C〉T, TT genotype was associated with a significantly higher （p〈0.05） number of live births than those recorded for CC sows and the additive effect was significant （p〈0.05） in Qingping and Min Pigs populations in later parities. For -1257G〉A, inconsistent results were found in three populations. The results suggested that T allele in pRNF4 gene might confer a high prolificacy in breeding and further studies were needed to confLrm the results.
基金Project(03GZ3072)supported by the Science end Technology Departmeat of Hunan Provincepproject(2004035206)supported by the China Poatdoctoral Foundationprojecl(30300383)supported by the National Natuml Sciences Foundastion of China
文摘Objective Tacrolimus is an immunosuppressive drug with narrow therapeutic range and wide interindividual variation in its pharmacokinetics.Tacrolimus is a substrate of cytochrome P450(CYP)3A5.The aim of this study was to evaluate whether the A6986G polymorphism is associated with tacrolimus concentration/dose ratio.Methods Fifty-two Chinese renal transplant patients were enrolled in this study.Their body weight,dosage and concentration of tacrolimus were observed.CYP3A5 genotype was determined by polymerase chain reaction followed by restriction fragment length polymorphism analysis.Results A significant association was found between tacrolimus levels per dose/kg/d and CYP3A5 gene A6986G polymorphism(P<0.001).The CYP3A5*3*3 patients have a significantly higher tacrolimus level/dose than CYP3A5*1*1 and CYP3A5*1*3.Conclusions CYP3A5 gene A6986G polymorphism is associated with tacrolimus pharmacokinetics and dose requirements.Pharmacogenetic methods could be employed prospectively to help the dose selection and to individualize immunosuppressive therapy according to the result.
基金Project(2014ZX09304307-002)supported by the Major Program of Science and Technology Foundation of ChinaProject supported by Technology Platform for Quality/Safety Inspection and Risk Management of Traditional Chinese Medicine,China+1 种基金Project(2014SK2001)supported by the Key Program Foundation of Hunan Provincial Science&Technology Department,ChinaProject(XSYK-R201502)supported by the Hunan Provincial Food and Drug Administration under Key Project of Science and Technology for Food and Drug Safety,China
文摘To screen genetic polymorphisms of Panax ginseng, as well as those of Panax quinquefolium and Panax notoginseng, analysis of random amplified polymorphic DNA （RAPD） was performed using 120 random primers. Of the successful amplicons obtained, the Panax ginseng-specific RAPD marker C-12 was cloned into a TA vector and sequenced （Genl3ank access number KU553472）. Based on the sequence analysis results, a pair of primers specific to C-12 was designed. Finally, a SCAR marker-based identification system for Panax ginseng was developed after optimization of the reaction conditions. Using this method, two positive bands were stably observed at 300 bp and 130 bp in 33 batches of Panax ginseng samples tested, while negative results were obtained for another 101 batches of samples, including Panax quinquefolium, Panax notoginseng, adulterants, and other medicinal herbs. Thus, we successfully developed a PCR-based method for rapid and effective identification of Panax ginseng, which can be effectively used for the protection and utilization of germplasm resources and identification of the origins of Panax ginseng samples.
