用聚合酶链反应检测T细胞白血病／淋巴瘤中HTLV－I前病毒DNA

用聚合酶链反应检测Ｔ细胞白血病／淋巴瘤中ＨＴＬＶ－Ｉ前病毒ＤＮＡ陈国敏,何士勤,王柠,张永利,曾毅（中国预防医学科学院病毒学研究所北京１０００５２）关键词聚合酶链反应（ＰＣＲ）,人Ｔ淋巴细胞病毒Ｉ型（ＨＴＬＶ－Ｉ）,前病毒,基因整合目前,国内对人Ｔ淋...     

人嗜T淋巴细胞白血病病毒I型(HTLV-Ⅰ)核心蛋白(p24)基因的克隆及在大肠杆菌中的表达

人嗜Ｔ淋巴细胞白血病病毒Ｉ型（ＨＴＬＶ－Ⅰ）核心蛋白（ｐ２４）基因的克隆及在大肠杆菌中的表达段震峰,滕志平,纪志武,陈国敏,张永利,曾毅（中国预防医学科学院病毒学研究所,北京１０００５２）关键词人嗜Ｔ淋巴细胞白血病病毒Ｉ型（ＨＴＬＶ－Ｉ）,聚合酶链反...     

人类T细胞白血病病毒I型pX基因反式调节和致白血病机理的研究进展

人类Ｔ细胞白血病病毒Ｉ型（ＨＴＬＶ－Ｉ）是成人Ｔ细胞白血病（ＡＴＬ）的病因。ＨＴＬＶ－Ｉ基因组中的ｐＸ基因区域编码ｐ４０＾ｔａｘ和ｐ２７＾ｒｅｘ蛋白,前者可反式激活病毒的ＬＴＲ和ＩＬ－２Ｒ及ｃ－ｆｏｓ、ＴＧＦβ１等细胞基因,加强转录过程,在白血病发生中发挥重要作用。ｐ２７＾ｒｅｘ蛋白则在转录后水平进行反馈性调节。白血病的发生机理是多因子参加的多步骤过程。     

我国福建省福清地区HTLV－Ⅰ无症状携带者体内HTLV－Ⅰ病毒核酸的检测

我国福建省福清地区ＨＴＬＶ－Ⅰ无症状携带者体内ＨＴＬＶ－Ⅰ病毒核酸的检测陈国敏,薛守贵,张永利,林惠添,董德华,林星,魏礼康,陈武,曾毅（中国预防医学科学院病毒学研究所,北京１０００５２）关键词嗜人Ｔ细胞病毒Ⅰ型,无症状携带者,聚合酶链反应,核酸杂交...     

持续性病毒感染免疫应答的群体动力学

本文以数学模式来探讨抗病毒免疫应答、病毒含量以及病毒变异性间的关系。由数学模式表明的结果并与人血病病毒Ｉ型（ＨＴＬＶ－Ｉ）和人类免疫缺陷病毒Ｉ型（ＨＩＶ－１）感染中杀伤性Ｔ细胞反应和病毒变异性研究的研究资料进行比较,获得较为一致的结果。     

人T细胞白血病病霉Ⅰ型env基因的克隆与表达

本文通过聚合酶链式反应（ＰＣＲ）,从整合有人Ｔ细胞白血病病毒Ⅰ型（ＨＴＬＶ－Ｉ）的ＭＴ－２细胞株中,扩增出ＨＴＬＶ－Ｉ外膜蛋白（ｅｎｖ）的全基因（１．４５ｋｂ）,并成功地克隆入ｐＵＣ１９载体,构建成ｅｎｖ基因克隆ｅｎｖ／ｐＵＣ１９．利用原核高效表达载体ｐＧＥＸ－２Ｔ,在大肠杆菌中有效地表达了与谷胱甘肽Ｓ－转移酶（ＧＳＴ）融合的ｅｎｖ羧基末端抗原的重组蛋白,融合基因的转录由ｔａｃ启动子调控。ＳＤＳ－ＰＡＧＥ结果表明,有一约５２ｋＤ的目的蛋白带,表达量占菌体总蛋白的１０％;ＷｅｓｔｅｒＮｂｌｏｔｔ及ＥＬＩＳＡ结果显示,表达产物能与ＨＴＬＶ－Ｉ多抗血清结合。本研究为研制ＨＴＬＶ－Ｉ的诊断试剂及进一步了解ｅｎｖ的免疫学和生物学性质打下了基础。     

福建沿海地区人T淋巴细胞白血病病毒1型膜基因的克隆和系统树分析

人Ｔ淋巴细胞白血病病毒１型（ＨＴＬＶ－１）是最早发现的一种ＲＮＡ肿瘤病毒。利用ＨＴＬＶ－１基因组长末重复区（ＬＴＲ）或膜基因（ｅｍｖ）序列进行系统树分析,可分为Ｃ、Ｊ、ＷＡ、ＣＡ和Ｍ５个亚型。为了解我国ＨＴＬＶ－１流行区毒株的主要基因型别,从福建莆田地区克隆出３株ＨＴＬＶ－１的ｅｎｖ基因。其序列与已知各亚型代表株进行系统树分析,结果表明均为Ｃ亚型。首次证实了中国大陆ＨＴＬＶ－１Ｃ亚型的存在。该地区     

人类嗜T细胞白血病Ⅰ型病毒TAX蛋白对NF—kB转录因子的作用

人类嗜Ｔ细胞白血病Ⅰ型病毒（ＨＴＬＶ－Ⅰ）是成人Ｔ细胞白血病（ＡＴＬ）的致病因子,其编码的ＴＡＸ蛋白的反式激活在白血病形成中有重要作用。ＮＦ－ｋＢ是细胞活化和产生细胞因子的重要转录调控因子。正常情况下,ＮＦ－ｋＢ因子与抑制性蛋白ＩＫＢ结合,形成复合物存在于胞质中。ＴＡＸ蛋白可与ＩＫＢ激酶γ（ＩＫＫγ）直接结合,而后启动ＴＡＸ对ＩＫＫα和ＩＫＫβ的结合,并使之发生磷酸化。后者使ＩＫＢ蛋白降解,ＮＦ－     

HTLV流行病学,遗传学和检测方法研究进展

ＨＴＬＶ是成人Ｔ细胞白血病和热带痉挛性麻痹症等疾病的致病因子,具有复杂的调控机制。由于所致疾病的危害性,及具有血液传播的特性,受到了广泛的重视。本文仅就ＨＴＬＶ流行病学,遗传学和检测方法方面的最新研究进展作一介绍。     

应用核酶的RNA修复功能治疗遗传疾病

十多年前 ,人们即已利用核酶 (ｒｉ ｂｏｚｙｍｅ)定点切割ＲＮＡ分子的特性 ,开始设计核酶进行抗病毒、抗肿瘤和针对某些疾病的研究 ,取得了不少进展。目前 ,针对乙肝病毒 (ＨＢＶ)和丙肝病毒 (ＨＣＶ)的核酶治疗进入了预临床 ,而针对人免疫缺损病毒 (ＨＩＶ)的核酶治疗正在进行Ｉ期 /ＩＩ期临床试验。此外 ,核酶抗病毒研究的对象有 :Ａ型流感病毒、人乳头状瘤病毒 (ＨＰＶ)、人Ｔ细胞白血病病毒 (ＨＴＬＶ)、昆虫核多角体病毒 (ＮＰＶ)等。依据同样原理 ,在了解肿瘤发病的分子机制的基础上 ,可设计核酶进行抗肿瘤研究 ,如切割ＢＣＲ/ＡＢ…     

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.     

The structure, reproduction and taxonomy of Vidalia and Osmundaria (Rhodophyta, Rhodomelaceae)

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.     

New or rare chromosome counts in Artemisia L. (Asteraceae, Anthemideae) and related genera from Kazakhstan

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.     

肝癌中HBV和HCV基因和抗原的分布及意义

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     

Selection with two alleles and complete dominance

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.