Objective:To investigate variable number tandem repeat (VNTR) polymorphism of the 17th intron of Rb gene in Shaanxi aged population and the relationship between the polymorphism of Rb gene and atherosclerosis(AS) gene...Objective:To investigate variable number tandem repeat (VNTR) polymorphism of the 17th intron of Rb gene in Shaanxi aged population and the relationship between the polymorphism of Rb gene and atherosclerosis(AS) genetic suscepti- bility. Methods: VNTR polymorphism of the 17th intron of Rb gene were examined in 100 Shaanxi aged AS patients and 100 Shaanxi aged control individuals by PCR-Rb-Xba Ⅰ-RFLP. Results::Two alleles were found both in AS group and control group, which were separately 945 bp(S1) and 630bp + 315bp(S2). S1S2 genotype was the most frequent one in the two populations. Significant difference in allele frequency was not found between AS group and control group, and allele frequency was no significant difference between Chinese and Caucasian. Conclusion: Xba Ⅰ enzyme site of Rb gene could have been certainly stable in AS population, and it was inferred that the polymorphism locus was not liable to cause mutation, which might not implicated in the formation of AS.展开更多
Objective and Methods: Excessive accumulation of collagen typeⅠ and type Ⅲ causes the formation of keloids and hypertrophic scars. To understand the mechanism by which antisense oligodeoxynucleotide (Oligo) acts on ...Objective and Methods: Excessive accumulation of collagen typeⅠ and type Ⅲ causes the formation of keloids and hypertrophic scars. To understand the mechanism by which antisense oligodeoxynucleotide (Oligo) acts on in vitro transcrption α1 (I) collagen gene, isotopes (α-32pGTP) was incorporated into 2 SP6 in vitro transcription systems. Results and Conclu- sion: Oligo 2 (at the transcription start region) could effectively inhibit in vitro transcription of pGEM3-Col13 and the control (random oligodeoxynucleotides) showed no inhibition. However, oligo 1 (at the transcription start region) obviously inhibited the in vitro transcription of pGEM3-Col14, while Oligo 2, which targeted at the down stream region (about 200 bp) of the promoter showed no significant inhibition effect.展开更多
Newcastle disease( ND) is one of the most serious infectious diseases that infect the poultry industry.There is only one serotype of Newcastle disease virus( NDV),but NDVs can be divided into two distinct classes( cla...Newcastle disease( ND) is one of the most serious infectious diseases that infect the poultry industry.There is only one serotype of Newcastle disease virus( NDV),but NDVs can be divided into two distinct classes( class Ⅰ,and class Ⅱ) according to their genetic relationship.To develop a method for rapid quantitative detection of class Ⅰ NDV,a pair of primers and a TaqM an probe were designed and synthesized according to the conservative sequence of NP gene of class Ⅰ NDV.The positive recombinant plasmid harboring NP gene of JS-18-05 isolate was used as a positive template to establish the standard curve.A real-time fluorescent quantitative RT-PCR method was established for rapid detection of class Ⅰ NDV with strong specificity,high sensitivity and good repeatability.The established method exhibited a good linear relationship within the concentration of 102 to 108 copies of NDV,by which 1 μl of 10 copy of NDV nucleic acid could be detected in the initial template.Compared with conventional virus isolation methods,the established method had similar sensitivity and led to the same results in detecting33 class Ⅰ,class Ⅱ NDV isolates.The study provided the basis for rapid quantitative detection of class Ⅰ NDVs and further clarification of their pathogenicity and pathogenic mechanism in poultry.展开更多
[Object] This study was conducted to explore the genetic diversity and structure of the wild Repomucenus curvicornis inhabiting Liaoning Coast, China. [Method] The mitochondrial COⅠ gene and control region（CR） were...[Object] This study was conducted to explore the genetic diversity and structure of the wild Repomucenus curvicornis inhabiting Liaoning Coast, China. [Method] The mitochondrial COⅠ gene and control region（CR） were PCR amplified from the wild R. curvicornis populations from the Liaodong Bay（n=22） and the northern Yellow Sea（n=18）, sequenced and analyzed for genetic diversity. [Result] The contents of A, T, C and G of 624 bp COⅠ gene were 24.09%, 31.04%, 25.28%, and 19.59%, and those of 460 bp CR fragment were 32.96%, 32.80%, 14.86% and 19.38%, respectively. The total number of variable sites, average number of nucleotide differences（ k）, haplotype diversity（H） and nucleotide diversity（π） based on COⅠ gene were 38, 4.67,（0.96±0.02） and（0.007 5±0.004 2）, and those based on CR fragment were 26, 3.35,（0.97 ±0.02） and（0.007 3±0.004 3）, respectively. Based on mitochondrial COⅠ gene and CR, the genetic diversity of Liaodong Bay population was lower than that of the northern Yellow Sea population. The AMOVA analysis based on CR fragments revealed almost significant genetic divergence between the Liaodong Bay and the northern Yellow Sea populations, while there was no significant genetic divergence based on COⅠ gene. The results showed that CR and COⅠ gene are effective molecular markers for detecting the genetic diversity of R. curvicornis population, while CR is more reliable than COⅠ gene in detecting the genetic structure. [Conclusion] CR is an appropriate marker for genetic analysis of marine fish population.展开更多
The gene cluster cfaABCED’ of enterotoxigenic Escherichia coli, encoding the fimbriae which is called colonization factor antigen located on a plasmid. It is positively regulated by cfaR, a member of the AraC family,...The gene cluster cfaABCED’ of enterotoxigenic Escherichia coli, encoding the fimbriae which is called colonization factor antigen located on a plasmid. It is positively regulated by cfaR, a member of the AraC family, and the cfaD’ gene region, which is located downstream of cfaE and is homologous to cfaR, had been described as a truncated cryptic gene. In the present study we observed that the CFA/ fimbriae subunit, cfaB, was expressed in lower amount by the cfaABCED’ clone pNTP513 in host E. coli HB101. The expression of CFA/ diminished by deletion of cfaD’ gene region from pNTP513, and was restored by acquisition of cfaD’ in trans. Furthermore, CFA/ expression by cfaD’ deletion mutant, the cfaABCE clone, was remarkably increased by the presence of cfaD’ in trans in a topoisomerase A deficient strain of E. coli DM800. These data suggest that cfaD’ region is a functional region of gene, that regulates the CFA/ expression with cfaR by unknown mechanism.展开更多
基金National Natural Sciences Foundation of China No. 39700165
文摘Objective:To investigate variable number tandem repeat (VNTR) polymorphism of the 17th intron of Rb gene in Shaanxi aged population and the relationship between the polymorphism of Rb gene and atherosclerosis(AS) genetic suscepti- bility. Methods: VNTR polymorphism of the 17th intron of Rb gene were examined in 100 Shaanxi aged AS patients and 100 Shaanxi aged control individuals by PCR-Rb-Xba Ⅰ-RFLP. Results::Two alleles were found both in AS group and control group, which were separately 945 bp(S1) and 630bp + 315bp(S2). S1S2 genotype was the most frequent one in the two populations. Significant difference in allele frequency was not found between AS group and control group, and allele frequency was no significant difference between Chinese and Caucasian. Conclusion: Xba Ⅰ enzyme site of Rb gene could have been certainly stable in AS population, and it was inferred that the polymorphism locus was not liable to cause mutation, which might not implicated in the formation of AS.
文摘Objective and Methods: Excessive accumulation of collagen typeⅠ and type Ⅲ causes the formation of keloids and hypertrophic scars. To understand the mechanism by which antisense oligodeoxynucleotide (Oligo) acts on in vitro transcrption α1 (I) collagen gene, isotopes (α-32pGTP) was incorporated into 2 SP6 in vitro transcription systems. Results and Conclu- sion: Oligo 2 (at the transcription start region) could effectively inhibit in vitro transcription of pGEM3-Col13 and the control (random oligodeoxynucleotides) showed no inhibition. However, oligo 1 (at the transcription start region) obviously inhibited the in vitro transcription of pGEM3-Col14, while Oligo 2, which targeted at the down stream region (about 200 bp) of the promoter showed no significant inhibition effect.
基金Supported by National Natural Science Foundation of China(30630048)National Science and Technology Support Program(2006BAD06A03)
文摘Newcastle disease( ND) is one of the most serious infectious diseases that infect the poultry industry.There is only one serotype of Newcastle disease virus( NDV),but NDVs can be divided into two distinct classes( class Ⅰ,and class Ⅱ) according to their genetic relationship.To develop a method for rapid quantitative detection of class Ⅰ NDV,a pair of primers and a TaqM an probe were designed and synthesized according to the conservative sequence of NP gene of class Ⅰ NDV.The positive recombinant plasmid harboring NP gene of JS-18-05 isolate was used as a positive template to establish the standard curve.A real-time fluorescent quantitative RT-PCR method was established for rapid detection of class Ⅰ NDV with strong specificity,high sensitivity and good repeatability.The established method exhibited a good linear relationship within the concentration of 102 to 108 copies of NDV,by which 1 μl of 10 copy of NDV nucleic acid could be detected in the initial template.Compared with conventional virus isolation methods,the established method had similar sensitivity and led to the same results in detecting33 class Ⅰ,class Ⅱ NDV isolates.The study provided the basis for rapid quantitative detection of class Ⅰ NDVs and further clarification of their pathogenicity and pathogenic mechanism in poultry.
基金Supported by the National Key R&D Program of China(2017YFC1404400)The National Natural Science Foundation of China(31770458)
文摘[Object] This study was conducted to explore the genetic diversity and structure of the wild Repomucenus curvicornis inhabiting Liaoning Coast, China. [Method] The mitochondrial COⅠ gene and control region（CR） were PCR amplified from the wild R. curvicornis populations from the Liaodong Bay（n=22） and the northern Yellow Sea（n=18）, sequenced and analyzed for genetic diversity. [Result] The contents of A, T, C and G of 624 bp COⅠ gene were 24.09%, 31.04%, 25.28%, and 19.59%, and those of 460 bp CR fragment were 32.96%, 32.80%, 14.86% and 19.38%, respectively. The total number of variable sites, average number of nucleotide differences（ k）, haplotype diversity（H） and nucleotide diversity（π） based on COⅠ gene were 38, 4.67,（0.96±0.02） and（0.007 5±0.004 2）, and those based on CR fragment were 26, 3.35,（0.97 ±0.02） and（0.007 3±0.004 3）, respectively. Based on mitochondrial COⅠ gene and CR, the genetic diversity of Liaodong Bay population was lower than that of the northern Yellow Sea population. The AMOVA analysis based on CR fragments revealed almost significant genetic divergence between the Liaodong Bay and the northern Yellow Sea populations, while there was no significant genetic divergence based on COⅠ gene. The results showed that CR and COⅠ gene are effective molecular markers for detecting the genetic diversity of R. curvicornis population, while CR is more reliable than COⅠ gene in detecting the genetic structure. [Conclusion] CR is an appropriate marker for genetic analysis of marine fish population.
文摘The gene cluster cfaABCED’ of enterotoxigenic Escherichia coli, encoding the fimbriae which is called colonization factor antigen located on a plasmid. It is positively regulated by cfaR, a member of the AraC family, and the cfaD’ gene region, which is located downstream of cfaE and is homologous to cfaR, had been described as a truncated cryptic gene. In the present study we observed that the CFA/ fimbriae subunit, cfaB, was expressed in lower amount by the cfaABCED’ clone pNTP513 in host E. coli HB101. The expression of CFA/ diminished by deletion of cfaD’ gene region from pNTP513, and was restored by acquisition of cfaD’ in trans. Furthermore, CFA/ expression by cfaD’ deletion mutant, the cfaABCE clone, was remarkably increased by the presence of cfaD’ in trans in a topoisomerase A deficient strain of E. coli DM800. These data suggest that cfaD’ region is a functional region of gene, that regulates the CFA/ expression with cfaR by unknown mechanism.
