ObjectiveTo explore the effects of serine hydroxymethyltransferase 1 （SHMT1） rs1979277 polymorphisms on pharmacokinetic characteristics and clinical prognosis of methotrexate （MTX） in children with acute lymphoblastic leukemia （ALL）. MethodsMatrix-assisted laser desorption/ionization time of flight mass spectrometry was used for SHMT1 rs1979277 genotyping in children with ALL . Clinical data including serum MTX concentrations， incidences of adverse events， and ALL relapse after chemotherapy with MTX were collected. The associations of SHMT1 rs1979277 G>A genotypes with dose-adjusted serum concentrations （C/D ratios）， adverse events of MTX， and relapse were analyzed. The associations between rs1979277 genotypes and SHMT1 expression were explored based on Bioinformatics methods. ResultsAmong the 146 children with ALL included， the rs1979277 GG homozygous genotype accounted for 85.62% （125/146）， while the GA heterozygous genotype accounted for 14.38% （21/146）. The frequency of the G allele was 92.81% （271/292）， while the A allele was only 7.19% （21/292）. Children with the GG homozygous genotype had higher median C/D ratios of MTX in 24 h ［12.06 （μmol·m²）/（L·g）］ and higher relapse rates （12.80%） than those in GA heterozygous genotype carriers ［10.96 （μmol·m²）/（L·g）， and 9.52%， respectively］. However， none of the above differences were statistically significant （all P>0.05）. The incidences of respiratory （19.05%） and liver disorders （33.33%） in children with the GA heterozygous genotype were significantly higher than those in GG homozygous genotype carriers （4.00% and 12.00%， respectively， P<0.05）. There were no statistically significant differences in the incidences of other adverse events. Bioinformatics analysis showed that the rs1979277 A allele was significantly associated with higher SHMT1 expression in multiple tissues， such as the tibial artery， pancreas， and adrenal gland （P<0.05）. ConclusionSHMT1 rs1979277 GA genotype may be a risk factor for respiratory and liver disorders in ALL children treated with MTX.

Nipah virus is a highly pathogenic zoonotic virus.The viral characteristics,epidemiological features,viral life cycle and pathogenic mechanisms of Nipah virus were summarized in the article,and the alternative drugs tar-geting various stages of the viral life cycle,including antibody drugs,peptide drugs,and small molecule com-pounds,were systematically reviewed.The current challenges confronting the process of research and development of alternative drugs for Nipah virus were analyzed,and an outlook was also made on future research direction of candidate drugs for Nipah virus,aiming to provide comprehensive and in-depth theoretical reference for prevention and control of Nipah virus as well as the development of drugs and to facilitate the further development of related fields.

Objective:This study aimed to explore the molecular mechanisms of the maladaptation of H3N2 influenza virus in chicken embryos, provide a theoretical basis for the restoration of H3N2 influenza vaccine production in chicken embryos.Methods:Samples of respiratory secretions from patients with influenza-like symptoms (Influenza-like Illness, ILI) caused by H3N2 influenza virus were inoculated into chicken embryos and Madin-Darby Canine Kidney cells (MDCK), respectively. After isolating the virus, hemagglutination experiments were conducted to detect hemagglutination titers and hemagglutination inhibition experiments were used to compare antigenic differences; further, whole-genome sequencing of H3N2 influenza virus was performed using second-generation high-throughput gene sequencing (Next Generation High-Throughput Gene Sequencing, NGS), and key amino acid sites of mutations were identified through sequence alignment; combined with sialic acid receptor binding experiments, the differences in the binding of wild-type and mutant receptor binding sites (RBS) to sialic acid receptors were compared; finally, molecular docking and molecular dynamics simulation method were used to explore the specific molecular mechanisms of how mutation sites affect the differences in the affinity of the RBS pocket for sialic acid receptors.Results:The hemagglutination assay result indicated that both chicken embryos and MDCK cells could isolate the influenza virus, and the hemagglutination inhibition test showed that no antigenic differences were produced in the isolated strains. NGS analysis revealed that the H3N2 virus underwent an F195Y mutation in the (RBS) region of the hemagglutinin (HA) protein after adaptation through chicken embryo passages. Receptor-binding experiments demonstrated that the F195Y mutation enhanced the virus′s binding ability to α2, 3-linked sialic acid glycan (Neu5Acα2-3Galβ1-4GlcNAcβ-PAA, 3′SLN), while the mutation did not affect the affinity of the RBS pocket for α2, 6-linked sialic acid glycan (Neu5Acα2-6Galβ1-4GlcNAcβ-PAA, 6′SLN). Molecular docking and molecular dynamics simulation result indicate that the F195Y mutation, by replacing a hydrophobic amino acid with a hydrophilic one, leads to a significant decrease in the structure of the RBS pocket, enhancing the binding stability of the H3N2 influenza virus with α2, 3-sln. This is specifically manifested by an increase in binding time and an increase in the number of hydrogen bonds at the RBS site with the receptor. Furthermore, the F195Y mutation does not alter the binding of the virus to other receptors.Conclusions:The F195Y mutation in the RBS pocket of H3N2 influenza virus is a key site affecting the viral chicken embryo inadaptability.

Objective:To explore the influences of FibroScan detection on the pregnancy outcomes of pregnant rats transfected with hepatitis B virus and the growth of their offspring rats.Methods:Sixty SPF-grade SD rats with a male-to-female ratio of 5∶1 were selected，randomly divided the female rats into the groups of mid-pregnancy with hepatitis B，late-pregnancy with hepatitis B，normal mid-pregnancy，normal late-pregnancy，and control group，and the rats in the mid-pregnancy and late-pregnancy groups were subjected to FibroScan testing on the 10th and 15th days of gestation respectively. The number of offspring rats in each group was randomly reduced to 10 on the 3rd day after delivery，and the offspring rats were divided into the groups of mid-pregnancy with hepatitis B，late-pregnancy with hepatitis B，normal mid-pregnancy，normal late-pregnancy，and control group. The pregnancy outcome levels of pregnant rats were observed by adopting a stratified analysis strategy，including differences in weight changes，number of deliveries，fetal rat outcomes，lactation conditions，litter size，and litter weight. The growth levels of offspring rats，including differences in weight，body length，tail length，and the time of fur growth，tooth eruption，eye opening，and ear standing on the 21st day were observed，and the survival rate of the offspring rats was compared.Results:With regard to the pregnancy outcome levels of the pregnant rats，there were no statistically significant differences in weight changes during pregnancy among the five groups of pregnant rats［ F（4，45）=2.627，Adjusted P=0.222］. There were also no statistically significant differences in the number of deliveries，fetal rat outcomes，and lactation conditions（Adjusted P=1.000）. The number of deliveries［ F（4，21.095）=2.280，Adjusted P=0.222］and litter weight［ F（4，20.128）=2.159，Adjusted P=0.222］showed no statistically significant differences. After correction using the BH method，none of the indicators showed significant differences（ P>0.05）. In terms of the growth levels of the offspring rats，among the five groups of offspring rats，there were no statistically significant differences in body weight on the 21st day［H（4）=11.623，Adjusted P=0.135］，body length on the 21st day［H（4）=10.962，Adjusted P=0.135］，and tail length on the 21st day［H（4）=9.126，Adjusted P=0.058］. Besides，the differences in the time of fur growth，tooth eruption，eye opening，and ear standing［H（4）=0.000，Adjust P=1.000］showed no statistical significance. The survival rate on the 7th day，14th day，and 21st day was 100%，with no significant differences（Adjusted P=1.000）. After correction using the BH method，none of the indicators showed significant differences（ P>0.05）. Conclusion:FibroScan detection had no significant influences on the pregnancy outcomes of pregnant rats with hepatitis B or on the growth of their offspring rats in multiple stages，dimensions，and indicators，indicating that FibroScan detection is safe for pregnant rats. This research provides an animal experimental basis for the safe use of FibroScan in pregnant women with chronic HBV infection.

This study aims to analyze the screening results and epidemiological characteristics of prostate cancer (PCa) among elderly males in the rural areas of Songjiang, Shanghai City, through the implementation of a preliminary prostate-specific antigen (PSA) screening based on a community-linkage model, and to explore an effective screening approach. A retrospective observational study design was employed to collect data from residents who underwent PSA screening at Songjiang Hospital affiliated to Shanghai Jiao Tong University School of Medicine, in collaboration with multiple community health service centers in Songjiang District, Shanghai City, between June 2022 and June 2024, through free clinics and annual health examinations. Prostate biopsy was recommended for individuals with total PSA (tPSA) levels >10 ng/ml and those with 4 ng/ml≤tPSA≤10 ng/ml and abnormal free-to-total PSA (f/tPSA) ratios. Clinical characteristics of detected PCa patients were analyzed. Follow-up was conducted through phone calls and home visits by family doctors, coupled with enhanced health education. The results indicated that a total of 17 198 residents participated in the screening, among which 2 234 (12.99%) had tPSA levels between 4 ng/ml and 10 ng/ml, and 257 (1.49%) had tPSA levels >10 ng/ml. Ultimately, 417 residents underwent prostate biopsy, with 171 being diagnosed with PCa, yielding a positive biopsy rate of 41.00% and a PCa detection rate of 0.99%. The predominant pathological subtype among PCa patients was adenocarcinoma (168 cases, 98.24%). Of the 146 PCa patients who received treatment, the majority were classified as intermediate or high-risk (124 cases, 84.93%). Furthermore, with the optimization of the screening model, there was a significant increase in the proportion of subsequent outpatient visits. In conclusion, the community-linkage-based PSA screening model demonstrated high effectiveness in screening for PCa among elderly males in the rural areas of Songjiang, Shanghai City. Epidemiological findings revealed that PCa patients in this region are primarily composed of intermediate and high-risk groups, highlighting the need for intensified early screening and health education.

OBJECTIVE To standardize the strategies for prevention and control of Chikungunya(CHIK)in healthcare in-stitutions so as to reduce the risk of transmission in the institutions.METHODS A working group comprising the ex-perts in hospital infection control,infectious diseases,and microbiology systematically reviewed domestic and international evidence and current guidelines,integrated China's vector ecology and healthcare realities,conducted two rounds of Delphi to achieve expert consensus,and graded the evidence and recommendation strength using the Oxford Centre for Evidence Based Medicine system.RESULTS The consensus issues 18 actionable recommendations on triage,patient mosquito-proof isolation,integrated vector control,protection of susceptible populations,environmental cleaning and disinfection,specimen management,medical textile handling,and outbreak emergency response,with each statement assigned an evi-dence level and recommendation strength.CONCLUSION This consensus is for the first time in China to provide evidence-graded strategies for control of CHIK in healthcare institutions,offering work flow-oriented,implementable guidance for clinicians,laboratorians,and infection-control personnel under different risk scenarios and enhancing the comprehensive coping capacity of the healthcare institutions.

Myelin is an essential structure that facilitates rapid saltatory conduction in the nervous system. Discrepancies in myelin microstructure are a hallmark of numerous neurological disorders, rendering the assessment of myelin integrity and content an indispensable tool in clinical diagnostics and neuroscience research. Extensive research has been dedicated to scrutinizing its biochemical makeup and morphology under normal, pathological, and experimental conditions over the years. In this review, we present an updated summary of the myelin sheath's structure, composition, and developmental trajectory. We systematically enumerate and contrast eight prevalent myelin staining techniques across dimensions of sensitivity, specificity, and resolution, delving into their underlying staining principles. With an initial application of myelin histology on the mouse demyelination model, our review accentuates the accurate delineation of myelination and the microstructural analysis of the myelin sheath. Such insights are anticipated to significantly contribute to the evaluation and understanding of white matter pathologies.
Myelin Sheath/metabolism* ; Animals ; Humans ; Demyelinating Diseases/pathology* ; Staining and Labeling/methods*

OBJECTIVES: This study aimed to investigate the potential mediating role of plasma phosphorylated tau217 (p-tau217) in the association between periodontitis and mild cognitive impairment (MCI). METHODS: In this case-control study, patients diagnosed with MCI in the Neurology Department of the First Affiliated Hospital of Shandong Second Medical University from November 2023 to May 2024 were selected as the case group (MCI group). Cognitively normal (CN) volunteers, matched for age and education level and recruited from the physical examination center during the same period, served as the control group (CN group). The general demographic data of the study participants were collected. The Beijing versions of the Montreal Cognitive Assessment (MoCA), clinical dementia rating (CDR), and activities of daily living scale (ADL) were used to assess neuropsychological functions. Clinical periodontal examinations were conducted, the periodontal inflamed surface area (PISA) was calculated, and the periodontitis stage was determined in accordance with the 2018 classification. Fasting elbow venous blood samples were collected in the morning, and blood biochemical indicators were measured. Plasma p-tau217 levels were detected using enzyme-linked immunosorbent assay (ELISA). Statistical analyses were performed using t-test, Mann-Whitney U test, chi-square test, partial correlation analysis, multivariate Logistic regression analysis, multiple linear regression analysis, restricted cubic spline (RCS) regression analysis, and mediation effect analysis. RESULTS: Among the 192 participants, 96 belong to the MCI group and 96 to the CN group. The prevalence of periodontitis was 63.5% in the MCI group and 43.8% in the CN group, with a statistically significant difference (χ²=7.561, P=0.006). The plasma p-tau217 levels in the MCI group were significantly higher than those in the CN group [7.00 (4.27-9.65) ng/mL versus 2.02 (0.80-3.81) ng/mL, Z=-8.108, P<0.001]. Partial correlation analysis revealed that plasma p-tau217 levels were positively correlated with all the clinical periodontal indices (all P<0.001). After adjustments for baseline covariates, multivariate Logistic regression indicated that periodontitis was an independent risk factor for MCI. Patients with periodontitis had a 1.977-fold higher MCI risk than those without periodontitis (OR=1.977, 95%CI: 1.088-3.594, P=0.025). Moreover, the MCI risk for stage Ⅰ/Ⅱ periodontitis and stage Ⅲ/Ⅳ periodontitis was 1.878 times (OR=1.878, 95%CI: 1.029-3.425, P=0.040) and 2.625 times (OR=2.625, 95%CI: 1.073-6.246, P=0.035) higher than that for patients without periodontitis, respectively. Trend test showed that the MCI risk increased with periodontitis severity (P_trend=0.016). After adjustments for baseline covariates, multiple linear regression analysis showed that periodontitis was an independent risk factor for increased plasma p-tau217 levels (β=3.309, 95%CI: 2.363-4.254, P<0.001). Compared with patients without periodontitis, those with stage Ⅰ/Ⅱ periodontitis (β=1.838, 95%CI: 0.869-2.806, P<0.001) and stage Ⅲ/Ⅳ periodontitis (β=5.539, 95%CI: 4.442-6.636, P<0.001) had significantly higher plasma p-tau217 levels. In addition, trend test indicated that plasma p-tau217 levels increased with periodontitis severity (P_trend<0.001). After adjustments for baseline covariates, RCS regression analysis further revealed that PISA had a positive linear dose-response relationship with MCI risk (P_overall=0.002, P_nonlinear=0.344) and plasma p-tau217 levels (P_overall<0.001, P_nonlinear=0.140). After adjustments for baseline covariates, mediation analysis showed that plasma p-tau217 mediated the association between periodontitis and MCI, with a mediation proportion of 13.99% (95% Bootstrap CI: 0.38%-49.39%, P=0.038). CONCLUSIONS Periodontitis was independently positively associated with MCI risk, and plasma p-tau217 plays a mediating role in this association.
Humans ; Cognitive Dysfunction/complications* ; tau Proteins/blood* ; Periodontitis/complications* ; Case-Control Studies ; Male ; Female ; Phosphorylation ; Aged ; Middle Aged ; Activities of Daily Living

Gene synthesis is an enabling technology that supports the development of synthetic biology. The existing approaches for de novo gene synthesis generally have tedious operation, low efficiency, high error rates, and limited product lengths, being difficult to support the huge demand of synthetic biology. The assembly and error correction are the keys in gene synthesis. This study first designed the oligonucleotide sequences by reasonably splitting the virus genome of approximately 10 kb by balancing the parameters of sequence design software ability, PCR amplification ability, and assembly enzyme assembly ability. Then, two-step PCR was performed with high-fidelity polymerase to complete the de novo synthesis of 3.0 kb DNA fragments, and error correction reactions were performed with T7 endonuclease Ⅰ for the products from different stages of PCR. Finally, the virus genome was assembled by 3.0 kb DNA fragments from de novo synthesis and error correction and then sequenced. The experimental results showed that the proposed method successfully produced the DNA fragment of about 10 kb and reduced the probability of large fragment mutations during the assembly process, with the lowest error rate reaching 0.36 errors/kb. In summary, this study developed an efficient de novo method for synthesizing a viral genome of about 10 kb with T7 endonuclease Ⅰ-mediated error correction. This method enabled the synthesis of a 10 kb viral genome in one day and the correct plasmid of the viral genome in five days. This study optimized the de novo gene synthesis process, reduced the error rate, simplified the synthesis and assembly steps, and reduced the cost of viral genome assembly.
Genome, Viral/genetics* ; Polymerase Chain Reaction/methods* ; DNA, Viral/genetics* ; Bacteriophage T7/enzymology* ; Synthetic Biology/methods*

Bacillus is a class of spore-producing Gram-positive bacteria that produce a variety of antimicrobial substances with different structures and functions. The application of the antimicrobial substances produced by Bacillus can effectively inhibit the activity of harmful bacteria and fungi and promote the sustainable development of green agriculture. The antimicrobial substances produced by Bacillus mainly include proteins, lipopeptides, polyketones, and polypeptides. This paper reviews the synthesis gene clusters, synthesis pathways, structures, and mechanisms of various antimicrobial substances produced by Bacillus and discusses the challenges in the industrial application of these antimicrobial substances. Furthermore, this paper clarifies the future research and development focuses and prospects the application prospects, and provides comprehensive theoretical support for the in-depth research and wide application of the antimicrobial substances produced by Bacillus.
Bacillus/genetics* ; Anti-Infective Agents/metabolism* ; Bacterial Proteins/genetics* ; Antimicrobial Peptides/biosynthesis* ; Lipopeptides/biosynthesis*