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苏云金芽孢杆菌毒蛋白基因在小麦基因组中的甲基化修饰 总被引:7,自引:1,他引:7
通过花粉管通道法将苏云金芽孢杆菌(Bacillusthuringiensis)毒蛋白基因(Bt.toxingene)转进了小麦品种京花5号与86Al。利用点杂交、Southern杂交和PCR等技术鉴定了转化植株的当代和子代,证实了Bttoxingene的导入与对小麦染色体的整合。利用对腺嘌呤(A)与胞嘧啶(C)甲基化敏感与否的限制性内切酶组(medhylation-(un)sensitiverestrictionenzymegroup,MREG)酶切和RCR扩增(MREG-PCR),对转化子代中的Bt基因片段甲基化形式进行了研究。结果表明,整合在小麦基因组中的Bt基因的A和C的甲基化形式发生了变化 相似文献
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cAMP反应序列结合蛋白及其家族与转录调节 总被引:8,自引:0,他引:8
cAMP反应序列结合蛋白(cAMP-responsiveelementbindingprotein,CREB)经磷酸化激活后,可参与cAMP诱导的多种靶基因的转录调控。新近研究表明,CREB的转录调节作用可能是通过CREB结合蛋白(CREB-bindingprotein,CBP)实现的。在神经系统中,CREB可能介导神经递质诱导的基因表达,并能通过放大神经营养因子的信号,参与神经细胞增殖、分化、存活等生物效应。 相似文献
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Epstein-Barr病毒(EBV)进入鼻咽上皮细胞的途径,是人们研究EBV与鼻咽癌(NPC)的病因关系时所必须回答的一个问题。用抗EBV受体(EBVR/CR_2)单抗检测上皮细胞中该受体的表达已有报道,但对上皮细胞中EBVR/CR_2的基因结构仍需研究。我们采用PCR扩增和不对称PCR直接测序法,首次检测了10例NPC及3例正常人胚鼻咽上皮(Humanembryonicnasoparyngealepithelium,HENE)组织样本中EBVR/CR_2的EBV结合区的编码序列。这一片段的DNA序列测定结果显示,人NPC细胞和正常HENE细胞的EBVR/CR_2的EBV结合区的编码序列,与正常人B淋巴细胞的EBVR/CR_2的相应序列完全相同,提示EBV感染鼻咽上皮细胞可能与EBVR/CR_2基因的EBV结合区结构改变无直接关系。 相似文献
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影响 培养基PH值变化的因素 总被引:3,自引:0,他引:3
植物组织培养基的PH值一旦外植体植入就开始发生改变,直到达到某一平衡点,不同种的植物有其各自的PH平衡点。用6种植物(PilotusexaltatusDessexLehm,LechennultiafomasusR.BR.,RosacaninaL.,Melaleucaalternifolia(Maiden&E.Betche)Cheel,AnigozanthosflatidusDC.,Zieriacy 相似文献
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木蓝根瘤菌的16S rDNA全序列分析及DNA—DNA杂交 总被引:2,自引:0,他引:2
通过数值分类,SDS-全细胞蛋白电泳分析,对分离自西北黄土高原地区的木蓝根瘤菌进行了研究,获得了1个新类群。在此基础上,进行了中心菌株SHL042的16S rDNA全序列分析,得到系统发育树状图。SHL042与R.tropici A、R.tropici B、R.leguminosarum、R.etli、R.hananesis、R.mongolense和R.gallicum构成一个发育分支,其与这些 相似文献
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RRM RNA 结合蛋白在基因的转录后调控中起着重要作用.人GRY-RBP 是我们实验室最近克隆的一个新的全长cDNA,编码一个RRM RNA 结合蛋白.GRY-RBP 的全编码区用PCR扩增后,克隆到pET30a+ 表达载体中,在E.coli中获得了高效表达,表达的GRY-RBP重组蛋白占细菌总蛋白的21% .利用融合在GRY-RBPN 端的His.Tag,采取亲和层析的方法纯化了表达的重组蛋白.为了检测GRY-RBP的RNA 结合活性及其所结合的RNA 性质,将表达的蛋白与poly(A)-Sepharose 4B结合,发现GRY-RBP能与polyA (A)结合,结合活性能被可溶性的poly(A)、poly(C)减弱.改变NaCl浓度和加入不同浓度的酵母tRNA竞争物后,poly(A)结合活性不变. 相似文献
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本文报导了A.H.Smith和L.R.Hesler 1968年命名的Pholiota conica A.H.Smith et L.R.Hesler在我国的新记录,并根据R.Singer 1975年的分类系统进行了新组合Kuehneromyces conicus(A.H.Smith et L.R.Hesler)J.B.Wang et Z.B.Chen comb.nov. 相似文献
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Recent advances in the study of Kaposi's sarcoma-associated herpesvirus replication and pathogenesis
It has now been over twenty years since a novel herpesviral genome was identified in Kaposi's sarcoma biopsies. Since then, the cumulative research effort by molecular biologists, virologists, clinicians, and epidemiologists alike has led to the extensive characterization of this tumor virus, Kaposi's sarcoma-associated herpesvirus(KSHV; also known as human herpesvirus 8(HHV-8)), and its associated diseases. Here we review the current knowledge of KSHV biology and pathogenesis, with a particular emphasis on new and exciting advances in the field of epigenetics. We also discuss the development and practicality of various cell culture and animal model systems to study KSHV replication and pathogenesis. 相似文献
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RICHARD E. NORRIS 《Botanical journal of the Linnean Society. Linnean Society of London》1991,106(1):1-40
Comprises species occurring mostly in subtidal habitats in tropical, subtropical and warm-temperate areas of the world. An analysis of the type species, V. spiralis (Sonder) Lamouroux ex J. Agardh, a species from Australia, establishes basic characters for distinguishing species in the genus. These characters are (1) branching patterns of thalli, (2) flat blades that may be spiralled on their axis, (3) width of the blade, (4) primary or secondary derivation of sterile and fertile branchlets and (5) position of sterile and fertile branchlets on the thalli. Application of the latter two characters provides an important basic method for separation of species into three major groups. Osmundaria , a genus known only in southern Australia, was studied in relation to Vidalia , and its separation from the Vidalia assemblage is not accepted. Species of Vidalia therefore are transferred to the older genus name, Osmundaria. Two new species, Osmundaria papenfussii and Osmundaria oliveae are described from Natal. Confusion in the usage of the epithet, Vidalia fimbriala Brown ex Turner has been clarified, and Vidalia gregaria Falkenberg, described as an epiphyte on Osmundaria pro/ifera Lamouroux, is revealed to be young branches of the host, Osmundaria prolifera. 相似文献
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JOAN VALUÈS MONTSERRAT TORRELL NÚRIA GARCIA JACAS 《Botanical journal of the Linnean Society. Linnean Society of London》2001,137(4):399-407
Fifteen chromosome counts of six Artemisia taxa and one species of each of the genera Brachanthemum, Hippolytia, Kaschgaria, Lepidolopsis and Turaniphytum are reported from Kazakhstan. Three of them are new reports, two are not consistent with previous counts and the remainder are confirmations of very scarce (one to four) earlier records. All the populations studied have the same basic chromosome number, x = 9, with ploidy levels ranging from 2x to 6x. Some correlations between ploidy level, morphological characters and distribution are noted. 相似文献
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肝癌中HBV和HCV基因和抗原的分布及意义 总被引:1,自引:0,他引:1
采用原位分子杂交方法检测HCV
RNA及HBV X基因;采用免疫组织化学方法研究HCV核心抗原,非结构区C33c抗原及HBxAg在肝细胞肝癌中的定位及分布.结果表明(1)HCV
RNA、HBV X基因在肝细胞肝癌组织检出率分别为40%(55/136)和82%(112/136).HCV
RNA定位于癌细胞的胞浆内,阳性细胞呈散在、灶状及弥漫分布三种形式;HBV
X基因在肝癌细胞中的分布呈胞浆型、核型及核浆型,阳性细胞也呈上述三种分布形式;(2)HCV
C33c抗原、核心抗原在肝细胞肝癌中的阳性率为81%(133/164)及86%(141/164).C33c抗原定位于癌细胞及肝细胞的胞浆内;核心抗原既定位于癌细胞核中,又可定位于胞浆中.C33c抗原阳性细胞以灶状分布为主;而核心抗原阳性细 相似文献
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H.-R. GREGORIUS 《Biological journal of the Linnean Society. Linnean Society of London》1984,23(2-3):157-165
For a plant selection model with frequency-independent viabilities, fertilities and selfing rates, it is shown that apart from global fixation, for certain parameter combinations a protected polymorphism and facultative fixation (either allele may become fixed according to initial frequencies) may both occur. Facultative fixation requires different selling rates for the dominant and recessive type. Protection of the polymorphism requires resource allocation for male and female function. In this connection the problem of purely genetically caused population extinction is discussed.
For general frequency dependence and regular segregation, the chances for establishment of a completely recessive gene are compared to those of a completely dominant gene. It is proven that the process of establishment of the recessive gene, despite a fitness advantage, may be considerably endangered by drift effects if random mating prevails. The recessive gene may reach the same effectivity in establishment as a dominant gene, only if the recessive homozygote mates exclusively with its own type during the period of establishment. 相似文献
For general frequency dependence and regular segregation, the chances for establishment of a completely recessive gene are compared to those of a completely dominant gene. It is proven that the process of establishment of the recessive gene, despite a fitness advantage, may be considerably endangered by drift effects if random mating prevails. The recessive gene may reach the same effectivity in establishment as a dominant gene, only if the recessive homozygote mates exclusively with its own type during the period of establishment. 相似文献