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111.
This study introduces the construction of the first intraspacific genetic linkage map of the A-genome diploid cotton with newly developed simple sequence repeat (SSR) markers using 189 F2 plants derived from the cross of two Asiatic parents were detected using 6 092 pairs of SSR primers. Two-hundred and sixty-eight pairs of SSR pdmers with better polymorphisms were picked out to analyze the F2 population. In total, 320 polymorphic bands were generated and used to construct a linkage map with JoinMap3.0. Two-hundred and sixty-seven loci, Including three phenotypic traits were mapped at a logarithms of odds ratio (LOD) ≥ 3.0 on 13 linkage groups. The total length of the map was 2 508.71 cM, and the average distance between adjacent markers was 9.40 cM. Chromosome assignments were according to the association of linkages with our backbone tetraploid specific map using the 89 similar SSR loci. Comparisons among the 13 suites of orthologous linkage groups revealed that the A-genome chromosomes are largely collinear with the At and Dt sub-genome chromosomes. Chromosomes associated with inversions suggested that allopolyploidization was accompanied by homologous chromosomal rearrangement. The inter-chromosomal duplicated loci supply molecular evidence that the A-genome diploid Asiatic cotton is paleopolyploid. 相似文献
112.
Ma Zhong-You Pu Shun-Chang Jiang Jing-Jing Huang Bo Fan Mei-Zhen Li Zeng-Zhi 《World journal of microbiology & biotechnology》2011,27(3):679-686
A novel gene of thermostable phytase, phyA, was isolated by polymerase chain reaction (PCR) techniques from Aspergillus aculeatus RCEF 4894. The full-length phyA gene comprises 1,404 bp and encodes 467 amino-acid residues, including a 19-residue putative N-terminal signal peptide.
The phytase of A. aculeatus was a novel addition to the histidine-acid phosphatase family, as evidenced by both the conserved motifs RHGXRXP and HD in
the amino-acid sequence, and 3D structure models. The recombinant phytase was overexpressed in Pichia pastoris, and its specific activity reached 3,000 U mL−1 at the optimum pH of 5.5. This recombinant, thermostable phytase was able to withstand temperatures of up to 90 °C for 10 min,
with a loss of only 13.9% of initial enzymatic activity, and showed high activity with phytic-acid sodium salt at a pH range
of 2.5–6.5. The broad pH optima and high thermostability of the phytase makes it a promising candidate for feed-pelleting
applications. 相似文献
113.
Differential role of microenvironment in microencapsulation for improved cell tolerance to stress 总被引:6,自引:0,他引:6
Sun ZJ Lv GJ Li SY Yu WT Wang W Xie YB Ma X 《Applied microbiology and biotechnology》2007,75(6):1419-1427
The effect of the microenvironment in alginate–chitosan–alginate (ACA) microcapsules with liquid core (LCM) and solid core
(SCM) on the physiology and stress tolerance of Sacchromyces cerevisiae was studied. The suspended cells were used as control. Cells cultured in liquid core microcapsules showed a nearly twofold
increase in the intracellular glycerol content, trehalose content, and the superoxide dismutase (SOD) activity, which are
stress tolerance substances, while SCM did not cause the significant physiological variation. In accordance with the physiological
modification after being challenged with osmotic stress (NaCl), oxidative stress (H2O2), ethanol stress, and heat shock stress, the cell survival in LCM was increased. However, SCM can only protect the cells
from damaging under ethanol stress. Cells released from LCM were more resistant to hyperosmotic stress, oxidative stress,
and heat shock stress than cells liberated from SCM. Based on reasonable analysis, a method was established to estimate the
effect of microenvironment of LCM and SCM on the protection of cells against stress factors. It was found that the resistance
of LCM to hyperosmotic stress, oxidative stress, and heat shock stress mainly depend on the domestication effect of LCM’s
microenvironment. The physical barrier of LCM constituted by alginate–chitosan membrane and liquid alginate matrix separated
the cells from the damage of oxidative stress and ethanol stress. The significant tolerance against ethanol stress of SCM
attributed to the physical barrier consists of solid alginate–calcium matrix and alginate–chitosan membrane. 相似文献
114.
115.
Olivia Sveidahl Johansen Tao Ma Jakob Bondo Hansen Lasse Kruse Markussen Renate Schreiber Laia Reverte-Salisa Hua Dong Dan Ploug Christensen Wenfei Sun Thorsten Gnad Iuliia Karavaeva Thomas Svava Nielsen Sander Kooijman Cheryl Cero Oksana Dmytriyeva Yachen Shen Maria Razzoli Shannon L. O’Brien Zachary Gerhart-Hines 《Cell》2021,184(13):3502-3518.e33
116.
117.
118.
Bovine and human insulin activate CD8+-autoreactive CTL expressing both type 1 and type 2 cytokines in C57BL/6 mice 总被引:2,自引:0,他引:2
CD8+ T cells down-regulate a variety of immune responses. For example, porcine and human insulin do not stimulate Abs in C57BL/6 mice because CD8+ T cells inhibit CD4+ helper T cells. By contrast, bovine insulin induces Ab in C57BL/6 mice, and removal of CD8+ T cells does not alter this response. This raises the question of whether porcine, but not bovine, insulin activates CD8+ T cells or whether both insulins activate CD8+ T cells but CD4+ helper T cells are differentially inhibited by them. In this study, we show that insulin-specific CD8+ CTL can be cultured from C57BL/6 mice primed with either bovine or human insulin in CFA. Thus, exogenous Ags, besides OVA, induce CD8+ CTL when administered in an adjuvant, suggesting this is a typical response. These CTL are H-2Kb restricted and produce IL-5, IL-10, IFN-gamma, and small amounts of IL-4, which is distinct from IFN-gamma and TNF-alpha that are typically secreted by virus-specific CTL. Moreover, the CTL primed with either bovine or human insulin recognize an A-chain peptide that is identical to the mouse insulin sequence. That foreign proteins, which are closely related to self-proteins, activated autoreactive, CD8+ T cells in vivo is a novel finding. It raises the possibility that self-reactive CTL may be activated by cross-reacting Ags and once activated they might participate in autoimmunity. These results also suggest that down-regulation of insulin-specific responses by autoreactive CD8+ T cells is most likely due to the differential sensitivity of bovine and human insulin-specific CD4+ T cells. 相似文献
119.
Juhua Yang Yihua Zhu Lu Chen Hongxing Zhang Dinggou Huang Shi Chen Xu Ma 《Biochemical and biophysical research communications》2009,386(4):693-696
We report the clinical and genetic characterization of a Chinese LHON family carrying an ND1/C4171A mutation. This family has high penetrance of visual impairment and extremely low frequency of vision recovery, which is in marked contrast to previously reported results for Korean LHON families with the same mutation. Sequence analysis of the complete mtDNA in the partially defined East Asian haplogroup N9a1 revealed the presence of 29 other variants. A novel heteroplasmic A14841G mutation, one of the variants with a serine substituted for a highly conserved asparagine at amino acid 32 of Cytochrome b (Cytb), may play a synergistic role with the C4171A mutation, leading to significantly different clinical manifestations of LHON among these families. The study further confirmed that C4171A was a rare primary LHON mutation, and the mtDNA background could also contribute to the clinical manifestation of the LHON/C4171A mutation. 相似文献
120.
Chronic ethanol exposure of human pancreatic normal ductal epithelial cells induces cancer stem cell phenotype through SATB2 下载免费PDF全文
Wei Yu Yuming Ma Sharmila Shankar Rakesh K. Srivastava 《Journal of cellular and molecular medicine》2018,22(8):3920-3928
The incidence of pancreatic cancer is on the rise. Risk factors for pancreatic cancer include alcohol toxicity and metabolic conditions such as obesity, hypertension, dyslipidaemia, insulin resistance and type 2 diabetes. However, the molecular mechanism by which chronic alcohol consumption contributes to pancreatic cancer is not well understood. The purpose of the study was to demonstrate the effects of long‐term chronic ethanol exposure on the transformation of human pancreatic normal ductal epithelial (HPNE) cells. Our data showed that ethanol‐transformed HPNE cells were more progressively transformed exhibiting spheroids and colonies, and anchorage‐independent growth. These transformed cells contained high levels of reactive oxygen species and induced SATB2 expression. Furthermore, during ethanol‐induced cellular transformation, cells gained the phenotypes of cancer stem cells (CSCs) by expressing pluripotency maintaining factors (Oct4, Sox2, cMyc and KLF4) and stem cell markers (CD24, CD44 and CD133). Ethanol‐induced SATB2 can bind to the promoters of KLF4, Oct4, cMyc, Sox2, Bcl‐2 and XIAP genes. Suppression of SATB2 expression in ethanol‐transformed HPNE cells inhibited cell proliferation, colony formation and markers of CSCs and pluripotency. These data suggest that chronic alcohol consumption may contribute toward the development of pancreatic cancer by converting HPNE cells to cancer stem‐like cells. 相似文献