Herpes Simplex Virus Type 1 (HSV-1) Strain HSZP Host Shutoff Gene: Nucleotide Sequence and Comparison with HSV-1 Strains Differing in Early Shutoff of Host Protein Synthesis

The UL41 gene of the HSZP strain of herpes simplex virus type 1 (HSV-1) defective with respect to the early shutoff of host protein synthesis was sequenced and compared with the corresponding HSV-1 strain KOS and 17 gene sequences. In comparison with strain 17, nine mutations (base changes) were HSZP specific, five KOS specific and four were common for both strains. Nine mutations caused codon changes. Three of these mapped to the nonconserved regions and the others to the conserved regions of the functional map of UL4l gene. One KOS specific mutation mapped to the region responsible for the binding of the virion host shutoff (vhs) protein to the alpha-transinducing factor (VP16). The possible relationship between mutations and host shutoff function is discussed. The nucleotide sequence data of the UL41 gene of HSZP and KOS have been submitted to the Genbank nucleotide database and have been assigned the accesion numbers Z72337 and Z72338. This revised version was published online in July 2006 with corrections to the Cover Date.     

3D-printed prostheses for large bone defect reconstruction following bone tumor surgery北大核心

BACKGROUND: Tumor segment resection is one of the standard methods for the treatment of bone tumors. However, the reconstruction of bone defects atumor resection faces many challenges. A growing number of researchers are focusing on 3D-printed prostheses for bone defect repair and reconstruction following bone tumor surgery. OBJECTIVE: To explore the feasibility of 3D-printed prostheses in the reconstruction of large bone defect following bone tumor surgery and to evaluate the postoperative outcomes. METHODS: Retrospective analysis of clinical data of 24 patients [19 males and 5 females, age 23.8 (6-61) years] who underwent bone tumor resection and 3D-printed prosthesis implantation in the Department of Bone Oncology, the First Affiliated Hospital of Xinjiang Medical University from December 2020 to September 2021 was conducted. There were 7 cases with distal femur tumor, 5 with pelvis tumor, 4 with proximal tibia tumor, 3 with middle femur tumor, 1 with distal tibia tumor, 1 with proximal humerus tumor, 1 with middle humerus tumor, 1 with scapula tumor, 1 with ulna tumor, and 22 cases with primary tumors (13 osteosarcoma, 4 Ewing sarcoma, 2 giant cell tumor of bone, 1 chondroblastoma, 1 chondrosarcoma, and 1 osteoblastoma), 2 metastatic carcinoma. Preoperative and postoperative imaging data were recorded and neoadjuvant chemotherapy was administered in 17 cases before surgery. The Musculoskeletal Tumour Society score was used to assess limb function before surgery and 6 months after surgery, and pain was assessed by the Visual Analog Scale, as well as the complications were recorded. RESULTS AND CONCLUSION: (1) All patients undergoing resection of the tumor segment and 3D-printed prosthesis implantation for the reconstruction of the bone defect were followed for 6-49 months, and the results showed that the length of osteotomy was (18.2 ± 7.3) cm and an average intraoperative bleeding volume was 740 (100-3 000) mL. (2) Two patients died of systemic metastasis, the remaining 22 had no pulmonary metastasis or recurrence during the follow-up period, and 1 patient developed aseptic loosening of the prosthesis at 25 months postoperatively. (3) The Musculoskeletal Tumour Society scores were significantly increased, while Visual Analog Scale scores were significantly decreased (P < 0.05) at 6 months postoperatively. (4) The Musculoskeletal Tumor Society score was rated excellent in all 22 patients at the final follow-up. (5) These results suggest that 3D-printed prosthesis is suitable for the reconstruction of large bone defects caused by bone tumor resection. Patients have good postoperative function and few complications. However, further investigations are needed to explore long-term follow-up results. © 2023, Publishing House of Chinese Journal of Tissue Engineering Research. All rights reserved.     

用RACE技术对一株肠道病毒3''端进行扩增和序列分析

目的 应用3′RACE技术对一株本室分离肠道病毒基因组3′末端进行扩增，并对其核苷酸序列进行比较分析。方法 提取病毒总RNA，以锚定oligdT（17）引物进行逆转录，用特异引物及锚定引物进行3′RACE扩增，将PCR产物进行克隆、测序和序列分析。结果 获得了该病毒的3′端核苷酸序列，同源性分析结果显示该肠道病毒的核苷酸序列与肠道病毒76、89、90、91型的同源性最高为90％左右，而与其他型别的肠道病毒的同源性均小于80％；推导的氨基酸同源性与肠道病毒76、89、90、91型均在90％以上。结论 用RACE技术对肠道病毒3′端进行扩增及序列分析，证明该病毒属新型肠道病毒类，为进一步研究该病毒的分子生物学特性奠定了基础。     

Genotype characterization and phylogenetic analysis of hepatitis B virus isolates from Iranian patients

Hepatitis B virus (HBV) is one of the major causative agents of acute and chronic liver disease worldwide and is believed to be responsible for a million deaths annually. Eight genotypes of HBV, A to H, have been described on the basis of similarity of the complete genomes sequence. Although, it is reported that the predominant HBV genotype in the Mediterranean area and the middle east is genotype D, there are no reports on HBV genotypes prevalent in Iran. In this study, the C and S regions of HBV from 26 chronic hepatitis B Iranian patients were amplified and sequenced. Phylogenetic analysis revealed that all Iranian HBV isolates sequences were classified into genotype D with bootstrap values of 100%, 73%, and 100% (1,000 replicates each) for S, C, and preS2 regions, respectively. The mean percent intra-distance of S and C regions were 0.8% and 2.3%, respectively. The mean percent inter-distance of S and C regions between Iranians and genotype D isolates were 1.7% and 3.0%, respectively, and the range of mean percent nucleotide distance of S and C regions between Iranians and the other reference isolates were 7.9%-17.5% and 4.8%-14.7%, respectively. Thirteen out of 23 HBV C region sequences showed nucleotide "A" at position 1896 (precore mutant) in C region. Nucleotide 1858 showed presence of "T" in all isolates. No insertion or deletion was found in both regions. SimPlot and BootScanning analyses did not show any recombination between Iranian isolates and other genotypes in both regions.     

Comparison of galE gene of Campylobacter jejuni strains associated Guillain-Barré syndrome

目的 测定3株格林.巴利综合征(Guillain-Barre syndrome,GBS)相关宅肠弯曲菌的gale基因序列,并同GenBank中的空肠弯曲菌菌株相应序列进行比较,了解致GBS的序列特征并分析其遗传进化关系.方法 选取分离自GBS患者粪便并经动物模型证实为致GBS的3株AMAN型空肠弯曲菌菌株进行培养并提取基因组DNA测序.将基因测序结果通过与NCTC11168菌株进行对照比较寻找galE基因突变位点并对gaZE基因片段进行遗传距离计算.结果 3株致GBS空肠弯曲菌菌株的galE基因均由987个碱基构成.与NCTC11168的galE基因序列相比,此3株空肠弯曲菌菌株gale基因核苷酸序列有4个相同碱基突变并导致了4个对应的相同氨基酸突变.遗传距离计算,zhanxing株与qiaoyuntao株距离为1.5%,zhanxing株与lulei株距离为1.6%,qiaoyuntao株与lulei株距离为0.5%.结论 GBS相关空肠弯曲菌中galE基因核苷酸序列的确存在相同变异且发生变异概率较非GBS相关空肠弯曲菌明显增大,遗传距离反映了此3株致GBS的空肠弯曲菌具有一定的区域特征.     

空间ICA在fMRI数据上的应用与分析

独立成分分析(ICA)技术试图将多维数据分解成若干个相互统计独立的分量。时间ICA和空间ICA都可以用于分析功能核磁共振成像(fMRI)数据。但由于fMRI数据空间维数远远大于时间维数，为计算方便，在分析fMRI数据时。则更多的使用空间ICA方法。本文在单任务激励实验中，利用ICA方法从fMRI数据中分离出若干个与任务相关的独立分量，其中包括与任务相关的恒定分量(CTR)和与任务相关的暂态分量(TTR)；通过将这些独立分量进行空间映射，得到了与任务相关的脑部激活区域。将此结果与SPM的分析比较，得到了一致的结果。在对结果的分析中，我们进一步指出了ICA方法的特点和局限性。     

广州市白云区1991—2007年艾滋病疫情监测

目的总结广州市白云区艾滋病流行特征，评估监测效能，为下一步防治工作的深入开展提供依据。方法运用SAS统计软件对广州市艾滋病疫情数据库中白云区属的病例进行相关描述性统计分析。结果截至2007年底，白云区共发现病例1136例，男女比为3．5：1；年龄以15-49岁为主（94．01％）。传播途径以静脉吸毒为主（61．10％），流动人口占疫情的大部分（71．48％）。性传播（x^2=12．009，P=0．001）和职业人群（x^2=44．935，P=0．001）随年份比例增加；常规监测发现病例日趋增加（x^2=5．533，P=0．019）。结论白云区已进入疫情的快速增长期，疫情主要侵袭青壮年男性，吸毒人群和无业人士所占比例较大。由于白云区在经济和生活上的一些特点，流动人口的疫情负担较重，且传播途径向多元化发展。加大监测力度包括高危人群干预专项和监测效能，将有助于迅速准确的掌握疫情。     

Unrestricted principal components analysis of brain electrical activity: Issues of data dimensionality,artifact, and utility

Summary Principal components analysis (PCA) was performed on the 1536 spectral and 2944 evoked potential (EP) variables generated by neurophysiologic paradigms including flash VER, click AER, and eyes open and closed spectral EEG from 202 healthy subjects aged 30 to 80. In each case data dimensionality of 1500 to 3000 was substantially reduced using PCA by magnitudes of 20 to over 200. Just 20 PCA factors accounted for 70% to 85% of the variance. Visual inspection of the topographic distribution of factor loading scores revealed complex loadings across multiple data dimensions (time-space and frequency-space). Forty-two non-artifactual factors were successful in classifying age, gender, and a separate group of 60 demented patients by linear discriminant analysis. Discrimination of age and gender primarily involved EP derived factors, whereas dementia primarily involved EEG derived factors. Thirty-eight artifactual factors were identified which, alone, could not discriminate age but were relatively successful in discriminating gender and dementia. The need to parsimoniously develop real neurophysiologic measures and to objectively exclude artifact are discussed. Unrestricted PCA is suggested as a step in this direction.Acknowledgements: This work was supported in part by NIA program project PO1AG049853 to M. Albert and the Mental Retardation Program Project P30HD18655 to J.J. Volpe. We thank our qEEG technologists Adele Mirabella, Susan Katz, Ellen Belles, and Marianne McGaffigan as well as our research secretaries for their unflagging support.