浙江地方猪种线粒体DNA多态及遗传多样性研究

本实验用ＡｐａＩ、ＡｖａＩ、ＢａｍＨⅠ、ＢｃｌⅠ、ＢｇｌⅠ、ＢｇｌⅡ、ＣｌａⅠ、ＤｒａⅠ、Ｅｃｏ ＲＩ、Ｅｃｏ ＲＶ、Ｈａｅ Ⅱ、Ｈｉｎｃ Ⅱ、ＨｉｎｄⅢ、ＨｐａⅠ、ＫｐｎⅠ、ＰｖｕⅠ、ＰｖｕⅡ、Ｓａｃ Ⅰ、ＳａｌⅠ、ＳｃａⅠ、ＳｍａⅠ、ＳｔｕⅠ、ＸｂａⅠ和ＸｈｏⅠ等２５种识别６个碱基对的限制性内切酶分析了浙江地方品种猪、浙江野猪等３０个个体的线粒体ＤＮＡ,共检出３０种限制性态型,可归结成３种单倍     

褐家鼠线粒体DNA遗传多态性的研究

通过碱变性法提取线粒体ＤＮＡ,用地高辛标记的探针Ｓｏｕｔｈｅｒｎ杂交限制性酶切多态性（ＲＦＬＰ）分析,研究中国家鼠Ｒａｔｔｕｓｎｏｒｖｅｇｉｃｕｓ遗传多态性。采用ＡｐａⅠ、ＡｖａⅠ、ＢａｎＨＩ、ＢｃｌⅠ、ＢｇｌⅠ、ＣｌａⅠ、ＥｃｏＲⅠ、ＥｃｏＲⅤ、ｈｉｎｄⅢ、ＰｖａⅡ、ＳｃａⅠ和ＸｂａⅠ等１２种限制性内切酶分析来自我国８个地区２６只褐家鼠的线粒体ＤＮＡ,共检出２０种限制性态型和１１种ｍｔＤＮＡ单倍     

海南黄牛和徐闻黄牛线粒体DNA的多态性及其品种分化关系

本文以ＡｐａⅠ、ＡｖａⅠ、ＢａｍＨⅠ、ＢｇｌⅠ、ＢｇｌⅡ、ＤｒａⅠ、ＥｃｏＲⅠ、ＥｃｏＲⅤ、ＨｉｎｄⅢ、ＨｐａⅠ、ＰｓｔⅠ、ＳａｌⅠ、ＳｃａⅠ和ＸｈｏⅠ等１４种限制性内切酶分析来自海南岛的海南黄牛和雷州半岛的徐闻黄牛的线粒体ＤＮＡ限制性片段长度多态性（ｍｔＤＮＡＡＲＦＬＰ）。结果只有一种限制性内切酶（ＳａｌⅠ）在海南黄牛中检测到多态性,并且其中的Ｃ型（１５．０,１．３）尚未见报道。我们的结果还显示,两个品种６个个体的ｍｔＤＮＡ基因单倍型全部表现为Ａ型,即瘤牛的血统。徐闻黄牛和海南黄牛ｍｔＤＮＡ极低的遗传变异度表明两个品种的亲缘关系很近,从而在分子生物学水平为其合称为雷琼黄牛提供了佐证。     

树鼠mtDNA限制性内切酶图谱及其与小家鼠褐家鼠的亲缘关系

本实验用ＡｐｅⅠ,ＡｖａⅠ,ＢａｍＨⅠ,ＢｃｌⅠ,ＢｇｌⅠ,ＣｌａⅠ,ＥｃｏＲⅠ,ＥｃｏＲＶ,ＨｐａⅠ,ＰｓｔⅠ,ＰｖｕⅡ,ＳｃａⅠ,ＸｂａⅠ等１３种限制性内切酶分析树鼠（Ｃｈｉｒｏｍｙｓｃｕｓｃｈｉｒｏｐｅｓ）的ｍｔＤＮＡ限制性片段长度多态性,并用双酶解法构建了其中８种酶的限制性内切酶图谱。根据限制性片段差异法和分子钟,计算并讨论树鼠和小家鼠（Ｍｕｓｍｕｓｃｕｌｕｓ）、褐家鼠（Ｒａｔｔｕｓｎｏｒｖｅｇｉｃｕｓ）的ｍｔＤＮＡ遗传距离和亲缘关系。结果表明树鼠与褐家鼠的关系较接近,两者的分歧时间在距今１５００─２０００万年前,即处于中新世早中期。     

猪獾和黄鼬mtDNA物理图谱及位点变异性初探

本实验用ＡｐａⅠ,ＢｇｌⅠ,ＢｇｌⅡ,ＣｌａⅠ,ＥｃｏＲⅠ,ＥｃｏＲⅤ,ＨｉｎｄⅢ,ＨｐｅⅠ,ＰｓｔⅠ,ＰｖｕⅠⅡ,ＳａｃⅠ,ＳａｌⅠ等１２种限制性内切酶分析猪獾和黄鼬的ｍｔＤＮＡ限制性片段,并用双酶解法构建限制性内切酶图谱。结合以往积累的资料,我们对哺乳动物ｍｔＤＮＡ限制性位点在远缘物种间的保守性和变异性进行了初步讨论。     

磁场对质粒pBR322DNA的影响

讨论了经５００ｍＴ、９００ｍＴ、１２００ｍＴ、１５００ｍＴ恒磁场作用后的质粒ｐＢＲ３２２ＤＮＡ与Ⅱ型限制性内切酶ＥｃｏＲⅠ、ＨｉｎｄⅢ、ＢａｍＨⅠＳａｌⅠ、ＰｓｔⅠ、ＰｕｖⅡ、ＴａｑⅠ、ＢｇｌⅠ、ＲｓａⅠ、ＨｉｎｆⅠ、ＡＰａⅠ、ＫｐｎⅠ等的单酶解、双酶解及多酶解反应。从琼脂糖电泳分离酶解片段的结果,发现经磁场作用过的ｐＢＲ３２２ＤＮＡ在３３６１—６３１ｂｐ的区段内产生了一个被ＨｉｎｆⅠ识别的新序列ＧＡＮＴＣ,证明了磁场作用能引起ＤＮＡ点突变。     

团头鲂线粒体DNA的限制性内切酶图谱

用ＢａｍＨⅠ,ＢｇｌⅠ,ＢｇｌⅡ,ＥｃｏＲⅠ,ＨｐａⅠ,ＫｐｎⅠ,ＰｓｔⅠ,ＳａｃⅠＳａｌⅠ,ＸｂａⅠ,和ＸｈｏⅠ１１种限制性内切酶对团头鲂（ＭｅｇａｌｏｂｒａｍａａｍｂｌｙｃｅｐｈａｌａＹｉｈ）的线粒体ＤＮＡ（ｍｔＤＮＡ）进行了单酶切,其切点数依次为２,３,２,３,３,１、０,１,０,０和０;经琼脂糖凝胶电泳测算出各酶切片断大小,得出团头鲂ｍｔＤＮＡ分子长约１６０２０±３５６碱基对（ｂｐ）,分子量６．３７×１０１８ｕ（原子质量）,构建了团头鲂ｍｔＤＮＡ的限制酶图。     

家养双峰驼线粒体DNA遗传多样性的研究

利用Ａｐａｌ、Ａｖａｌ、ＢａｍＨ、Ｂｃｌ１、Ｂｇｌ、、Ｂｇｌ２、Ｄｒａ１、ＷＥｃｏＲ１、ＥｃｏｒＶ、Ｈｉｎｄ３、Ｋｐｎ、、Ｐｕｖ２、Ｓａｅ１、Ｓｅａ１、Ｓｍａｌ、Ｘｂａ１、Ｘｈｏ１１８种限制制性内切酶的ｍｔＤＮＡ限制睛段长度多态（ＲＦＬＰ）分析,对我国双峰驼３个类群的遗传多样性及其亲缘关系进行了研究。结果表明,在双峰驼ｍｔＤＮＡ蝇未发现长度变异和个体内异质现象,从３个类群的８７个个体中,共检出了３     

木毒蛾核型多角体病毒形态结构及理化性质的研究

木毒蛾核型多角体病毒属昆虫杆状病毒科,核型多角体病毒属,多粒包埋型。在扫描电镜下,多角体呈不规则多面体,大小下一,平均直径为１．４μｍ,病毒粒子杆状,大小约为３９４×５６ｎｍ,经ＳＤＭ－ＰＡＧＥ分析,病毒多角体蛋白分子量为３０．５ｋＤ,病毒粒子结构蛋白由１９条多肽组成,分子量范围在８８－１７ｋＤ之间。多角体富含Ｇｌｕ、Ｖａｌ、Ｌｅｕ、而Ｃｙｓ、Ｍｅｔ、和Ｈｉｓ含量较少。其酸碱氨基酸之比为１．２６。病毒核酸为一环状ＤＮＡ,长度约为３８μｍ,经ＨｉｎｄⅢ、ＰｓｔⅠ、ＥｃｏＲⅠ和ＢｇｌⅠ单酶切以及ＢａｍＨⅠ＋ＨｉｎｄⅢ、ＢａｍＨⅠ＋ＰｓｔⅠ、ＢａｍＨⅠ＋ＢｇＩⅠ和Ｘｈｏｌ＋ＥｃｏＲⅠ双酶切分析,ＤＮＡ总分子量约为７１．６×１０￣６Ｄａｌｔｏｎｓ。     

胡子鲇mtDNA多态性及限制性酶切图谱

用８种限制性内切酶对胡子鲇（ＣｌａｒｉａｓｆｕｓｃｕｓＬａｃｅｐｅｄｅ）肝脏线粒体ＤＮＡ（ＭｉｔｏｃｈｏｎｄｒｉａｌＤＮＡ,ｍｔＤＮＡ）进行了分析。ＸｈｏⅠ、ＥｃｏＲⅠ、ＰｓｔⅠ、ＢａｍＨⅠ、ＸｂａⅠ、ＨｉｎｄⅢ在ｍｔＤＮＡ分子上分别有２、３、１、１、３和５个切点。胡子鲇种内存在ｍｔＤＮＡ酶切片段长度多态性（Ｒｅｓｔｒｉｃｔｉｏｎｆｒａｇｍｅｎｔｌｅｎｇｔｈｐｏｌｙｍｏｒｐｈｉｓｍｓ,ＲＦＬＰ）。经ＢｇｌⅠ、ＢｇｌⅡ酶解,ｍｔＤＮＡ都出现两种酶切类型,Ⅰ型各具２个片段,Ⅱ型各具１个片段。ｍｔＤＮＡ分子量为１０．２４２×１０６ｕ,长度约为１６．６８ｋｂ。用双酶解法建立了胡子鲇ｍｔＤＮＡ的限制性酶切图谱,并对ＲＦＬＰ现象进行了分析。     

Curcuminoids as inhibitors of thioredoxin reductase: A receptor based pharmacophore study with distance mapping of the active site

Curcumin is the yellow pigment of turmeric that interacts irreversibly forming an adduct with thioredoxin reductase (TrxR), an enzyme responsible for redox control of cell and defence against oxidative stress. Docking at both the active sites of TrxR was performed to compare the potency of three naturally occurring curcuminoids, namely curcumin, demethoxy curcumin and bis-demethoxy curcumin. Results show that active sites of TrxR occur at the junction of E and F chains. Volume and area of both cavities is predicted. It has been concluded by distance mapping of the most active conformations that Se atom of catalytic residue SeCYS498, is at a distance of 3.56 from C13 of demethoxy curcumin at the E chain active site, whereas C13 carbon atom forms adduct with Se atom of SeCys 498. We report that at least one methoxy group in curcuminoids is necessary for interation with catalytic residues of thioredoxin. Pharmacophore of both active sites of the TrxR receptor for curcumin and demethoxy curcumin molecules has been drawn and proposed for design and synthesis of most probable potent antiproliferative synthetic drugs.     

A Unique Protease Cleavage Site Predicted in the Spike Protein of the Novel Pneumonia Coronavirus (2019-nCoV) Potentially Related to Viral Transmissibility

正Dear Editor,In December 2019, a novel human coronavirus caused an epidemic of severe pneumonia(Coronavirus Disease 2019,COVID-19) in Wuhan, Hubei, China(Wu et al. 2020; Zhu et al. 2020). So far, this virus has spread to all areas of China and even to other countries. The epidemic has caused 67,102 confirmed infections with 1526 fatal cases     

Comparative morphology of the carpel in the Liliaceae: Hewardieae, Petrosavieae, and Tricyrteae

The young pistils in the melanthioid tribes, Hewardieae, Petrosavieae and Tricyrteae, are uniformly tricarpellate and syncarpous. They lack raphide idioblasts. All are multiovulate, with bitegmic ovules. The Petrosavieae are marked by the presence of septal glands and incomplete syncarpy. Tepals and stamens adhere to the ovary in the Hewardieae and the Petrosavieae but not in the Tricyrteae. Two vascular bundles occur in the stamens of the Hewartlieae and Tricyrtis latifolia. Ventral bundles in the upper part of the ovary of the Hewardieae are continuous with compound septal bundles and placental bundles in the lower part. Putative ventral bundles occur in the alternate position in the Tricyrteae and putative placental bundles in the opposite. position in the Petrosavieae. The dichtomously branched stigma in each carpel of the Tricyrteae is supplied by a bifurcated dorsal bundle.     

鸡传染性法氏囊病病毒研究进展

传染性法氏囊病(Infection bursal disease, IBD)是由鸡传染性法氏囊病毒(Infectious bursal disease virus, IBDV)引起的鸡和火鸡的一种高度接触性传染病,给世界各国的禽养殖业带来了巨大损失.自IBDV发现至今新的变异株不断出现,分子结构的改变导致病毒致病力的改变及宿主对疫苗应答的改变,使得传统的疫苗已不能控制其流行,因此各国学者对其基因组结构和功能进行了广泛深入的研究,并积极研制新型有效的疫苗以达到防治的目的.     

Development of a Novel Reverse Transcription Loop-Mediated Isothermal Amplification Method for Rapid Detection of SARS-CoV-2

In conclusion, the novel visual RT-LAMP assay is a simple, rapid, and sensitive approach for detection of SARS-CoV-2, and it is ready for application in primary care and community hospitals or health care centers, and even patients' own houses in response to the current SARS-CoV-2 epidemic because the assay does not require sophisticated equipment and skilled personnel. Furthermore, it is also ready to be used in fields for screening samples from wild animals and environments to facilitate the identification of potential intermediate hosts that mediate the cross-species transmission of SARS-CoV-2 from bats to humans.     

Perinatal Vertical Transmission of Chikungunya Virus in Ruili,a Town on the Border between China and Myanmar

正Dear Editor,Chikungunya virus (CHIKV), an arbovirus in the family of Togaviridae, genus Alphavirus, is transmitted by the A.aegyptii or A. albopictus mosquito, and causes disease in humans characterized by fever, rash, and arthralgia (Silva and Dermody 2017; Suhrbier 2019). It was first reported in 1953 in Tanzania, and caused only a few outbreaks and sporadic cases in Africa and Asia in last century. However, in the epidemic in 2004, CHIKV acquired mutations that conferred enhanced transmission by the A. albopictus mosquito(Schuffenecker et al. 2006). Since then, it has successively caused outbreaks in Africa, the Indian Ocean, South East Asia, the South America, and Europe (Zeller et al. 2016).     

Enterovirus 71 3C proteolytically processes the histone H3 N-terminal tail during infection

Highlights
1. The N-terminal tail of histone H3 is specifically cleaved during EV71 infection.
2. Viral protease 3C is identified as a protease responsible for proteolytically processing the N-terminal H3 tail.
3. Our finding reveals a new epigenetic regulatory mechanism for Enterovirus 71 in virus-host interactions.