Integrative analysis of transcriptomic profile reveals potential roles of miRNAs in regulating development of Marsupenaeus japonicas

Regulation of microRNAs(miRNAs)on various biological processes has been a surprising and exciting field.Identification of miRNAs is the first step to comprehensively understand their functions.However,attempts on global identification and functional verification of miRNAs are very limited in penaeid shrimp Marsupenaeus japonicus,an economically important aquatic species.By performing an integrated analysis of transcriptomic profile from gastrula embryos of M.japonicus,21conserved miRNAs in M.japonicas(mja-miRNAs),belonging to 19 miRNA families,were identified and characterized.Of the 21 mja-miRNAs,15 miRNAs were successfully verified to be predominantly expressed in gastrula stage,where they displayed dynamic expression patterns compared with those in naupliuin stage.Based on perfect or near-perfect match to target region,120 target genes were predicted at transcriptome-wide level.Noteworthy,gene ontology(GO)classification and metabolic pathway annotation revealed eight targets that were actively involved in developmental processes.Of the predicted miRNA-mRNA pairs,six targets were then randomly selected and experimentally validated by dual luciferase reporter assay,where three pairs were proved with potential targeting activity.Overall,to search for conserved miRNAs potentially involved in early development of M.japonicus,we combined in silico and experimental methods,which can be applied in other organisms as well.Our data implied important roles of miRNAs in the early embryonic development and also suggested the presence of complex miRNA-mRNA functional networks in M.japonicus.

错配修复基因蛋白在结直肠癌诊治中的临床应用

目的:探讨错配修复基因(mismatch repair gene,MMR)蛋白MLH1、MSH2、MSH6、PMS2在结直肠癌中的表达及在临床中的应用。方法:选取四川省人民医院2015年1月至2016年9月收治的607例结直肠癌患者,采用免疫组织化学法检测手术标本中MMR蛋白的表达情况,研究其与临床病理学的关系,并评价其在Lynch综合征和散发性结直肠癌筛查中的价值。结果:607例患者中MMR表达缺失率为35.58%。MMR蛋白表达缺失的阴性组与表达正常的阳性组,在年龄、性别、肿瘤大小、P53、CD34、D2-40的比较,差异均无统计学意义(P>0.05);两组患者在肿瘤位置、分化程度、TNM分期、淋巴结转移、VEGF、Ki-67的比较,差异均有统计学意义(P<0.05)。联合检测MLH1、MSH2、PSM2、MSH6蛋白可以作为初步筛选Lynch综合征患者的方法。结论:对结直肠癌患者的手术标本进行MMR检测,筛查Lynch综合征患者和家族成员,进行管理及干预,可降低部分人群患结直肠癌的风险。

Promotion effect of epoxy group neighboring single-atom Cu site on acetylene hydrochlorination

Carbon materials have been used as the support for catalysts in the field of acetylene hydrochlorination,the influence of inevitable oxygen-containing moieties on the reaction is often ignored and the mechanism of the oxygen-doping structure remains ambiguous.Herein,we explored the effect of the oxygen-containing group(C-O-C)in the support on the activity of single-atom dispersed Cu catalysts.By immersing the Cu single-atom catalyst in an alkaline solution,the epoxy species on the carbon support was cleaved to obtain a pure ether species while the Cu site was modified to a more electron-deficient state.The turnover frequency value of Cu/O-FLP catalyst with epoxy groups was 1.6-fold higher than that of alkaline treated catalyst.Our result indicated that the epoxy groups could assist adjacent single-atom Cu sites to synergistically promote the adsorption and cleavage of the reactant hydrogen chloride toward form C-OH and Cu-Cl bonds,and reduce the reaction energy barrier.The presence of electron deficient Cu sites and ether species could induce competitive adsorption of the acetylene and hydrogen chloride,thereby reducing the activity of the catalyst.This study highlights the influence of surface oxygen species and the tunability of the support,providing the foundation for the fabrication of higher-activity Cu catalysts for acetylene hydrochlorination.

Manipulating micro-electric field and coordination-saturated site configuration boosted activity and safety of frustrated single-atom Cu/O Lewis pair for acetylene hydrochlorination

Simultaneously boosting acetylene hydrochlorination activity and avoiding formation of explosive copper acetylide over Cu-based catalyst,which represented a promising alternative to Hg-based and noble metal catalysts,remained challenging.Herein,we fabricated a frustrated single-atom Cu/O Lewis pair catalyst(Cu/O-FLP)by coupling epoxide group(C-O-C)with atomdispersed Cu-cis-N_(2)C_(2)Cl center to address this challenge.The basic epoxy site modulated the electron-deficient state of Lewisacidic Cu center and paired with the Cu-cis-N_(2)C_(2)Cl moiety to preferentially break HCl into different electronegative Cu-Clδ-and C-O-H^(δ+)intermediates,which further induced both an extra localized electric field to polarize acetylene and a upshift of the dband center of catalyst,thereby promoting adsorption and enrichment of acetylene by enhancing the dipolar interaction between acetylene and active intermediates.Moreover,the generated Cu-Clδ-and C-O-H^(δ+)drastically reduced the energy barrier of ratelimiting step and made vinyl chloride easier to desorb from the Lewis-basic oxygen-atom site rather than traditional Lewis-acidic Cu center.These superiorities ensured a higher activity of Cu/O-FLP compared with its counterparts.Meanwhile,preferential dissociation of HCl endowed single-atom Cu with the coordination-saturated configuration,which impeded formation of explosive copper acetylide by avoiding the direct interaction between Cu and acetylene,ensuring the intrinsic safety during catalysis.

Corrigendum to“Nucleolin interacts with the rabbit hemorrhagic disease virus replicase RdRp,nonstructural proteins p16 and p23,playing a role in virus replication”<[Virologica Sinica 37(2022)48-59]>

Due to our negligence,the original version of this article,published online on 12 January 2022,contained a mistake in Fig.4A.The lane ofβ-actin in Western blotting was misused.The correct Fig.4 is given below.We apologize for our oversight when preparing the figure and state that this does not change the scientific conclusions of the article in any way.

金属合金中的类分子化学结构单元

本文引入Friedel振荡理论,揭示固溶体合金中存在类似分子式的结构单元,指出在特定的成分下,合金中的原子在近程序上倾向于聚集为理想的有序结构,这个结构包括最近邻壳层原子(记作团簇)和次近邻壳层原子(记作连接原子),用团簇式:[团簇](连接原子)来表示.这种近程序结构被称为化学结构单元,类似于固溶体中的"分子".本文给出了FCC结构固溶体合金中化学结构单元的计算公式,通过计算得到Cu基二元体系的理想化学结构单元,包括CuZn、Cu-Al、Cu-Ni、Cu-Be和Cu-Sn,均为工业中最常用的合金成分.此外,工业上常用的多元合金,如Al合金5083和7075、高温合金TMS-196和TMS-82、马氏体时效不锈钢Cutom-465和奥氏体不锈钢310s,其成分均满足模型的预测,表明本模型可以为FCC结构复杂固溶体合金的成分设计提供理论指导.

Nucleolin interacts with the rabbit hemorrhagic disease virus replicase RdRp, nonstructural proteins p16 and p23, playing a role in virus replication

Rabbit hemorrhagic disease virus(RHDV)is a member of the Caliciviridae family and cannot be propagated in vitro,which has impeded the progress of investigating its replication mechanism.Construction of an RHDV replicon system has recently provided a platform for exploring RHDV replication in host cells.Here,aided by this replicon system and using two-step affinity purification,we purified the RHDV replicase and identified its associated host factors.We identified rabbit nucleolin(NCL)as a physical link,which mediating the interaction between other RNA-dependent RNA polymerase(Rd Rp)-related host proteins and the viral replicase Rd Rp.We found that the overexpression or knockdown of NCL significantly increased or severely impaired RHDV replication in RK-13 cells,respectively.NCL was identified to directly interact with RHDV Rd Rp,p16,and p23.Furthermore,NCL knockdown severely impaired the binding of Rd Rp to Rd Rp-related host factors.Collectively,these results indicate that the host protein NCL is essential for RHDV replication and acts as a physical link between viral replicase and host proteins.