Fine mapping of the red plant gene R_1 in upland cotton (Gossypium hirsutum)

Sub 16 is a substitution line with G. hirsutum cv. TM-1 genetic background except that the 16th chro-mosome (Chr. 16) is replaced by the corresponding homozygous chromosome of G. barbadense cv. 3-79, and T586 is a G. hirsutum multiple gene marker line with 8 dominant mutation genes. The R1 gene for anthocyanin pigmentation was tagged in Chr. 16 in T586. The objective of this research was to screen SSR markers tightly linked with R1 by using the F2 segregating population containing 1259 plants derived from t...     

雌雄异株植物MADS-box基因密码子偏好性分析

为了解雌雄异株植物间MADS-box基因家族的密码子使用偏好性特点,以拟南芥为参照,利用Gen-Bank Feature Extractor,Codonw和CUSP等软件对已发表的雌雄异株植物MADS-box基因序列的密码子偏好性进行分析,发现拟南芥及雌雄异株植物中均偏好使用密码子第3位点为U和A的密码子.再运用SPSS11.5对拟南芥和雌雄异株植物的MADS-box基因密码子偏好性进行聚类分析,发现雌雄异株植物与拟南芥在MADS-box基因的密码子选择偏好方面的差异不显著.从而得出雌雄异株植物对MADS-box基因密码子偏好性不具有显著影响.     

运用农杆菌介导的瞬时表达体系研究PDS基因沉默

农杆菌介导的瞬时表达体系是一个研究整株植物基因沉默的快速实用系统.本文介绍了运用该系统研究马铃薯X病毒诱导烟草(Nicotiana benthamianan benthamiana)八氢番茄红素脱氢酶(phytoene desaturase,PDS)基因的沉默问题.实验结果表明:携带有与PDS基因同源的409个碱基大小的cDNA片段的重组的马铃薯X病毒载体抑制了内源的PDS基因的表达.     

血管内皮生长因子936^＊T／C基因多态性与胃癌的关系

研究血管内皮生长因子（VEGF）936^＊T／C基因多态性与胃癌之间的关系,了解该基因多态性对胃癌生成及发展的影响。采用聚合酶链反应一限制性片段长度多态性（PCR-RFLP）方法检测胃癌患者和健康者外周血的VEGF936。T／C基因型。结果,胃癌患者外周血中VEGF936。T／C基因型或等位基因与健康者相比无差异（精确概率法计算基因型P=0．226;卡方检验等位基因x^2=2．934,P=0．087）。Ⅲ、Ⅳ期病理分期患者C／C基因型和c等位基因比例（66．7％和82．0％）明显大于Ⅰ、Ⅱ期（12．9％和1．2％）,两者差异有统计学意义（基因型：x^2：14．215,P=0．000;等位基因：X2=28．430,P=0．000）。结果表明,VEGF9360C／C基因多态性与胃癌的生成无关,而与胃癌的进展相关。     

Network Visualization in Cell Biology

Many of the processes known to take place in biological cells are analyzed in the form of different types of network.The complexity of these networks increases along with our knowledge of these processes,making their analysis more difficult.Network visualization is a powerful analysis method that will have to be developed further to deal with this complexity.This survey provides a brief overview of network visualization in general,followed by an in-depth discussion of its application to three network types specific to cell biology,namely gene regulatory,protein interaction,and metabolic networks.Finally,we discuss the difficulty of visually integrating these network types and trying to compare networks of cells that belong to different organisms.     

自闭症谱系障碍与共病的主要易感基因

共病在自闭症患者身上非常普遍,在回顾以往研究的基础上,对自闭症与共病之间存在的重叠关键基因进行了总结,为理解自闭症与这些共病的发生机理以及自闭症与共病之间所涉及的共同生物学过程提供一些启示。     

Transcritption regulation of soybean ribulose-l,5-bisphos-phate carboxylase small sub-unit gene by external factors

Ribulose-1,5-bisphosphate carboxylase small subunit gene (rbcS) is present with multi-gene family in plant genome. In Glycine max, the rbcS polypeptide (EC4.1.1.39) is encoded by a gene family containing 4—8 members. Three full-length rbcS cDNA clones were isolated and characterized from soybean seedlings, and both of their nucleotide and amino acid sequences showed high similarity. Differential accumulation of the rbcS mRNA was observed among roots, hypocotyls, cotyledons, epicotyls and leaves. The rbcS genes were up-regulated by various external factors such as salicylic acid (SA), salt stress and drought stress. The expression level of rbcS genes after being treated by 2.0 mmol/L SA and 0.4% NaCl, respectively, is 2.5—3.0-fold as high as that of control sample. Moreover, soybean rbcSmRNA was accumulated with diurnal variation but easily influenced by light and low temperature.