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Articles by Q. Fang
Total Records ( 4 ) for Q. Fang
  C. Hu , W. Jia , R. Zhang , C. Wang , J. Lu , H. Wu , Q. Fang , X. Ma and K. Xiang


Aims  Retinol binding protein 4 (RBP4) is a newly discovered adipokine, which plays a role in insulin resistance and obesity. The aim of this study was to determine the relationship between genetic variants of the RBP4 gene, circulating RBP4 concentrations and phenotypes related to glucose and lipid metabolism in the Chinese population.

Methods  We sequenced exons and the putative promoter region to identify single nucleotide polymorphisms (SNPs) in the RBP4 gene in 32 Chinese subjects. Additional SNPs were selected from a public database to increase marker density. Taking account of the pairwise linkage disequilibrium and minor allele frequencies, a subset of SNPs was further genotyped in 255 Type 2 diabetic patients and 372 normal control subjects. Circulating RBP4 concentrations and phenotypes related to glucose and lipid metabolism were measured.

Results  Ten SNPs were identified and five were further genotyped in the full sample. No individual SNP was significantly associated with Type 2 diabetes, but a rare haplotype CAA formed by +5388 C>T, +8201 T>A and +8204 T>A was more frequent in diabetic patients (P = 0.0343, empirical P = 0.0659 on 10 000 permutations). In both groups, non-coding SNPs were associated with circulating RBP4 concentrations (P < 0.05). In the normal control subjects, the SNP +5388 C>T was associated with serum C-peptide levels both fasting and 2 h after an oral glucose tolerance test (P = 0.0162 and P = 0.0075, respectively).

Conclusion  Our findings suggest that genetic variants in the RBP4 gene may be associated with circulating RBP4 concentration and phenotypes related to glucose metabolism.

  Q. Fang , S. Chen , Y. Wang , S. Jiang , R. Zhang , C. Hu , C. Wang , F. Liu , K. Xiang and W. Jia
  Aims  Hepatocyte nuclear factor-1α (HNF-1α) regulates the expression of genes encoding proteins involved in glucose metabolism and insulin secretion. Mutations in the HNF-1α gene cause maturity-onset diabetes of the young Type 3. However, the mechanism leading to this disease has not been completely ascertained. Previously, we found a novel mutation in the regulatory element of the human HNF-1α gene in two Chinese diabetes pedigrees. The nucleotide at position -128 T was substituted by G (nt-128 T[RIGHTWARDS ARROW]G). In this study, we analysed the functional defect of nt-128 T[RIGHTWARDS ARROW]G in HNF-1α transcription activity.

Methods  Luciferase reporter gene assays were carried out to examine the functional characteristics of this mutant. Electrophoretic mobility shift assays and chromatin immunoprecipitation were performed to confirm the binding of nuclear proteins to oligonucleotides.

Results  The variant construct (nt-128 T[RIGHTWARDS ARROW]G) had a 1.65-fold increase in promoter activity compared with that of the wild-type construct in HepG2 cells and a 1.33-fold increase in MIN6 cells, respectively. The variant resided at a FOXA/HNF-3 binding site identified by a series of competitive electrophoretic mobility shift assays and antibody supershift analyses. The assays showed a differential binding affinity in the wild-type and the nt-128 T[RIGHTWARDS ARROW]G mutant fragments by FOXA/HNF-3. Chromatin immunoprecipitation indicated that FOXA/HNF-3 bound to this region in vivo. One nucleotide substitution in the FOXA/HNF-3 site in the human HNF-1α regulatory element caused an increase of HNF-1α transcriptional activity.

Conclusions  Our data suggested that this substitution in the promoter region affects DNA-protein interaction and HNF-1α gene transcription. The mutant may contribute to the development of diabetes in these two nt-128 T[RIGHTWARDS ARROW]G pedigrees of Chinese.

  Z.M. Pan , S.Z. Geng , Y.Q. Zhou , Z.Y. Liu , Q. Fang , B.B. Liu and X.A. Jiao
  A total of 163 Salmonella sp. isolates representing 15 serotypes recovered from faecal samples of domestic animals (chicken, duck, goose and pig) in eastern China during 2008-2009 were tested for antimicrobial susceptibilities. S. Senftenberg, S. Typhimurium S. Pullorum and S. Enteritidis were the most prevalent serovars. Resistance was most often observed to carbenicillin (65.4%), followed by nalidixic acid (48.8%), tetracycline (46.9%), sulfafurazole (45.7%), ampicillin (43.2%), streptomycin (38.3%) and trimethoprim/sulfamethoxazole (33.3%). With regards to the source of isolates, chicken Salmonella sp. isolates displayed the highest rate of resistance being resistant to at least one antimicrobial (100%) followed by those recovered from pig (93.4%), goose (90.7%) and duck (80%). Serovars commonly showing Multidrug Resistance (MDR) to >9 antimicrobials were S. Enteritidis (55.6%), S. Pullorum (17.9%) and S. Typhimurium (17.2%). This study has revealed the prevalence and antimicrobial resistance patterns of Salmonella sp. in domestic animals in eastern China and provides the important information for better controlling these pathogens.
  Q. Fang , Q. Fang , Q. Yu , R. W. Malone , S. A. Saseendran and L. R. Ahuja
  Excessive N and water use in agriculture causes environmental degradation and can potentially jeopardize the sustainability of the system. A field study was conducted from 2000 to 2002 to study the effects of four N treatments (0, 100, 200, and 300 kg N ha–1 per crop) on a wheat (Triticum aestivum L.) and maize (Zea mays L.) double cropping system under 70 ± 15% field capacity in the North China Plain (NCP). The root zone water quality model (RZWQM), with the crop estimation through resource and environment synthesis (CERES) plant growth modules incorporated, was evaluated for its simulation of crop production, soil water, and N leaching in the double cropping system. Soil water content, biomass, and grain yield were better simulated with normalized root mean square errors (NRMSE, RMSE divided by mean observed value) from 0.11 to 0.15 than soil NO3–N and plant N uptake that had NRMSE from 0.19 to 0.43 across these treatments. The long-term simulation with historical weather data showed that, at 200 kg N ha–1 per crop application rate, auto-irrigation triggered at 50% of the field capacity and recharged to 60% field capacity in the 0- to 50-cm soil profile were adequate for obtaining acceptable yield levels in this intensified double cropping system. Results also showed potential savings of more than 30% of the current N application rates per crop from 300 to 200 kg N ha–1, which could reduce about 60% of the N leaching without compromising crop yields.
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