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As one of the post-transcriptional regulatory mechanisms, uncoupling of transcription and translation plays an essential role in development and adulthood physiology. However, it remains elusive how thousands of mRNAs get translationally silenced while stability is maintained for hours or even days before translation. In addition to oocytes and neurons, developing spermatids display significant uncoupling of transcription and translation for delayed translation. Therefore, spermiogenesis represents an excellent in vivo model for investigating the mechanism underlying uncoupled transcription and translation. Through full-length poly(A) deep sequencing, we discovered dynamic changes in poly(A) length through deadenylation and re-polyadenylation. Deadenylation appeared to be mediated by microRNAs (miRNAs), and transcripts with shorter poly(A) tails tend to be sequestered into ribonucleoprotein (RNP) granules for translational repression and stabilization. In contrast, re-polyadenylation might allow for translocation of the translationally repressed transcripts from RNP granules to polysomes. Overall, our data suggest that miRNA-dependent poly(A) length control represents a previously unreported mechanism underlying uncoupled translation and transcription in haploid male mouse germ cells.
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MicroRNAs , Poli A , Animais , Haploidia , Masculino , Camundongos , MicroRNAs/genética , MicroRNAs/metabolismo , Poli A/metabolismo , Biossíntese de Proteínas , RNA Mensageiro/metabolismo , Espermátides/metabolismoRESUMO
Chimeric antigen receptor (CAR)-engineered T cell therapies have been recognized as powerful strategies in cancer immunotherapy; however, the clinical application of CAR-T is currently constrained by severe adverse effects in patients, caused by excessive cytotoxic activity and poor T cell control. Herein, we harnessed a dietary molecule resveratrol (RES)-responsive transactivator and a transrepressor to develop a repressible transgene expression (RESrep) device and an inducible transgene expression (RESind) device, respectively. After optimization, these tools enabled the control of CAR expression and CAR-mediated antitumor function in engineered human cells. We demonstrated that a resveratrol-repressible CAR expression (RESrep-CAR) device can effectively inhibit T cell activation upon resveratrol administration in primary T cells and a xenograft tumor mouse model. Additionally, we exhibit how a resveratrol-inducible CAR expression (RESind-CAR) device can achieve fine-tuned and reversible control over T cell activation via a resveratrol-titratable mechanism. Furthermore, our results revealed that the presence of RES can activate RESind-CAR T cells with strong anticancer cytotoxicity against cells in vitro and in vivo. Our study demonstrates the utility of RESrep and RESind devices as effective tools for transgene expression and illustrates the potential of RESrep-CAR and RESind-CAR devices to enhance patient safety in precision cancer immunotherapies.
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Citotoxicidade Imunológica/imunologia , Imunoterapia Adotiva/métodos , Leucemia Eritroblástica Aguda/imunologia , Ativação Linfocitária/imunologia , Receptores de Antígenos de Linfócitos T/imunologia , Receptores de Antígenos Quiméricos/imunologia , Linfócitos T/imunologia , Animais , Apoptose , Proliferação de Células , Modelos Animais de Doenças , Feminino , Humanos , Leucemia Eritroblástica Aguda/genética , Leucemia Eritroblástica Aguda/metabolismo , Leucemia Eritroblástica Aguda/terapia , Camundongos , Camundongos Endogâmicos NOD , Camundongos SCID , Células Tumorais Cultivadas , Ensaios Antitumorais Modelo de XenoenxertoRESUMO
A series of iso-allo-DNJ and L-isoDALDP derivatives were synthesized from dithioacetal 16 with sequential and highly diastereoselective Ho and Henry reactions, and aziridinium intermediate-mediated ring rearrangement as key steps. Glycosidase inhibition assay found four of them as selective α-glucosidase inhibitors, and the less substituted compound 30 showed more potent α-glucosidase inhibition (IC50 = 9.3 µM) than the others. Molecular docking study revealed different docking modes of the iso-allo-DNJ and L-isoDALDP derivatives from their parent compounds, and also the similarity of compound 30 to isofagomine.
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Inibidores de Glicosídeo Hidrolases , alfa-Glucosidases , alfa-Glucosidases/metabolismo , Relação Estrutura-Atividade , Simulação de Acoplamento Molecular , Inibidores de Glicosídeo Hidrolases/farmacologia , Glicosídeo Hidrolases , Estrutura MolecularRESUMO
In the process of ocean exploration, highly accurate and sensitive measurements of seawater temperature and pressure significantly impact the study of seawater's physical, chemical, and biological processes. In this paper, three different package structures, V-shape, square-shape, and semicircle-shape, are designed and fabricated, and an optical microfiber coupler combined Sagnac loop (OMCSL) is encapsulated in these structures with polydimethylsiloxane (PDMS). Then, the temperature and pressure response characteristics of the OMCSL, under different package structures, are analyzed by simulation and experiment. The experimental results show that structural change hardly affects temperature sensitivity, and square-shape has the highest pressure sensitivity. In addition, with an input error of 1% F.S., temperature and pressure errors were calculated, which shows that a semicircle-shape structure can increase the angle between lines in the sensitivity matrix method (SMM), and reduce the effect of the input error, thus optimizing the ill-conditioned matrix. Finally, this paper shows that using the machine learning method (MLM) effectively improves demodulation accuracy. In conclusion, this paper proposes to optimize the ill-conditioned matrix problem in SMM demodulation by improving sensitivity with structural optimization, which essentially explains the cause of the large errors for multiparameter cross-sensitivity. In addition, this paper proposes to use the MLM to solve the problem of large errors in the SMM, which provides a new method to solve the problem of the ill-conditioned matrix in SMM demodulation. These have practical implications for engineering an all-optical sensor that can be used for detection in the ocean environment.
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BACKGROUND: Generating chromosome-scale haplotype resolved assembly is important for functional studies. However, current de novo assemblers are either haploid assemblers that discard allelic information, or diploid assemblers that can only tackle genomes of low complexity. RESULTS: Here, Using robust programs, we build a diploid genome assembly pipeline called gcaPDA (gamete cells assisted Phased Diploid Assembler), which exploits haploid gamete cells to assist in resolving haplotypes. We demonstrate the effectiveness of gcaPDA based on simulated HiFi reads of maize genome which is highly heterozygous and repetitive, and real data from rice. CONCLUSIONS: With applicability of coping with complex genomes and fewer restrictions on application than most of diploid assemblers, gcaPDA is likely to find broad applications in studies of eukaryotic genomes.
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Cromossomos , Diploide , Alelos , Haploidia , Haplótipos , Sequenciamento de Nucleotídeos em Larga Escala , Análise de Sequência de DNARESUMO
OBJECTIVES: The objective of this study was to compare oxygen extraction fraction (OEF) values in the deep gray matter (GM) of pre-eclampsia (PE) patients, pregnant healthy controls (PHCs), and non-pregnant healthy controls (NPHCs) to explore their brain oxygen metabolism differences in GM. METHODS: Forty-seven PE patients, forty NPHCs, and twenty-one PHCs were included. Brain OEF values were computed from quantitative susceptibility mapping (QSM) plus quantitative blood oxygen level-dependent magnitude (QSM + qBOLD = QQ)-based mapping. One-way ANOVA was used to compare mean OEF values in the three groups. The area under the curve of the mean OEF value in each region of interest was estimated using a receiver operating characteristic curve analysis. RESULTS: We found that the mean OEF values in the thalamus, putamen, caudate nucleus, pallidum, and substantia nigra were significantly different in these three groups (F = 5.867, p = 0.004; F = 5.142, p = 0007; F = 6.158, p = 0.003; F = 6.319, p = 0.003; F = 5.491, p = 0.005). The mean OEF values for these 5 regions were higher in PE patients than in NPHCs and in PHCs (p < 0.05). The AUC of these ROIs ranged from 0.673 to 0.692 (p < 0.01) and cutoff values varied from 35.1 to 36.6%, indicating that the OEF values could discriminate patients with and without PE. Stepwise multivariate analysis revealed that the OEF values correlated with hematocrit in pregnant women (r = 0.353, p = 0.003). CONCLUSION: OEF values in the brains of pregnant women can be measured in clinical practice using QQ-based OEF mapping for noninvasive assessment of hypertensive disorders. KEY POINTS: ⢠Pre-eclampsia is a hypertensive disorder associated with abnormalities in brain oxygen extraction. ⢠Oxygen extraction fraction (OEF) is an indicator of brain tissue viability and function. QQ-based mapping of OEF is a new MRI technique that can noninvasively quantify brain oxygen metabolism. ⢠OEF values in the brains of pregnant women can be measured for noninvasive assessment of hypertensive disorders in clinical practice.
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Hipertensão Induzida pela Gravidez , Pré-Eclâmpsia , Encéfalo/diagnóstico por imagem , Encéfalo/metabolismo , Mapeamento Encefálico/métodos , Circulação Cerebrovascular , Feminino , Substância Cinzenta/diagnóstico por imagem , Humanos , Hipertensão Induzida pela Gravidez/metabolismo , Imageamento por Ressonância Magnética/métodos , Oxigênio , Consumo de Oxigênio , Pré-Eclâmpsia/metabolismo , GravidezRESUMO
Type-B response regulator proteins in rice contain a conserved receiver domain, followed by a GARP DNA binding domain and a longer C-terminus. Some type-B response regulators such as RR21, RR22 and RR23 are involved in the development of rice leaf, root, flower and trichome. In this study, to evaluate the application potential of type-B response regulators in rice genetic improvement, thirteen type-B response regulator genes in rice were respectively knocked out by using CRISPR/Cas9 genome editing technology. Two guide RNAs (gRNAs) were simultaneously expressed on a knockout vector to mutate one gene. T0 transformed plants were used to screen the plants with deletion of large DNA fragments through PCR with specific primers. The mutants of CRISPR/Cas9 gene editing were detected by Cas9 specific primer in the T1 generation, and homozygous mutants without Cas9 were screened, whose target regions were confirmed by sequencing. Mutant materials of 12 OsRRs were obtained, except for RR24. Preliminary phenotypic observation revealed variations of various important traits in different mutant materials, including plant height, tiller number, tillering angle, heading date, panicle length and yield. The osrr30 mutant in the T2 generation was then further examined. As a result, the heading date of the osrr30 mutant was delayed by about 18 d, while the yield was increased by about 30%, and the chalkiness was significantly reduced compared with those of the wild-type under field high temperature stress. These results indicated that osrr30 has great application value in rice breeding. Our findings suggest that it is feasible to perform genetic improvement of rice by editing the type-B response regulators.
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Oryza , Oryza/genética , Oryza/metabolismo , Sistemas CRISPR-Cas/genética , Melhoramento Vegetal , Edição de Genes/métodos , Fenótipo , Plantas/genéticaRESUMO
BACKGROUND: Donor livers undergo subjective pathologist review of steatosis before transplantation to mitigate the risk for early allograft dysfunction (EAD). We developed an objective, computer vision artificial intelligence (CVAI) platform to score donor liver steatosis and compared its capability for predicting EAD against pathologist steatosis scores. METHODS: Two pathologists scored digitized donor liver biopsy slides from 2014 to 2019. We trained four CVAI platforms with 1:99 training:prediction split. Mean intersection-over-union (IU) characterized CVAI model accuracy. We defined EAD using liver function tests within 1 week of transplantation. We calculated separate EAD logistic regression models with CVAI and pathologist steatosis and compared the models' discrimination and internal calibration. RESULTS: From 90 liver biopsies, 25,494 images trained CVAI models yielding peak mean IU = 0.80. CVAI steatosis scores were lower than pathologist scores (median 3% vs 20%, P < 0.001). Among 41 transplanted grafts, 46% developed EAD. The median CVAI steatosis score was higher for those with EAD (2.9% vs 1.9%, P = 0.02). CVAI steatosis was independently associated with EAD after adjusting for donor age, donor diabetes, and MELD score (aOR = 1.34, 95%CI = 1.03-1.75, P = 0.03). CONCLUSION: The CVAI steatosis EAD model demonstrated slightly better calibration than pathologist steatosis, meriting further investigation into which modality most accurately and reliably predicts post-transplantation outcomes.
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Fígado Gorduroso , Transplante de Fígado , Aloenxertos , Inteligência Artificial , Fígado Gorduroso/diagnóstico , Fígado Gorduroso/patologia , Sobrevivência de Enxerto , Humanos , Fígado/patologia , Transplante de Fígado/efeitos adversos , Transplante de Fígado/métodos , Doadores Vivos , Fatores de RiscoRESUMO
Segmenting cell nuclei within microscopy images is a ubiquitous task in biological research and clinical applications. Unfortunately, segmenting low-contrast overlapping objects that may be tightly packed is a major bottleneck in standard deep learning-based models. We report a Nuclear Segmentation Tool (NuSeT) based on deep learning that accurately segments nuclei across multiple types of fluorescence imaging data. Using a hybrid network consisting of U-Net and Region Proposal Networks (RPN), followed by a watershed step, we have achieved superior performance in detecting and delineating nuclear boundaries in 2D and 3D images of varying complexities. By using foreground normalization and additional training on synthetic images containing non-cellular artifacts, NuSeT improves nuclear detection and reduces false positives. NuSeT addresses common challenges in nuclear segmentation such as variability in nuclear signal and shape, limited training sample size, and sample preparation artifacts. Compared to other segmentation models, NuSeT consistently fares better in generating accurate segmentation masks and assigning boundaries for touching nuclei.
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Núcleo Celular/fisiologia , Aprendizado Profundo , Processamento de Imagem Assistida por Computador/métodos , Microscopia/métodos , Algoritmos , Artefatos , Biologia Computacional , Células HeLa , Humanos , SoftwareRESUMO
N-Substituted derivatives of 1,4-dideoxy-1,4-imino-d-mannitol (DIM), the pyrrolidine core of swainsonine, have been synthesized efficiently and stereoselectively from d-mannose with 2,3:5,6-di-O-isopropylidene DIM (10) as a key intermediate. These N-substituted derivatives include N-alkylated, N-alkenylated, N-hydroxyalkylated and N-aralkylated DIMs with the carbon number of the alkyl chain ranging from one to nine. The obtained 33 N-substituted DIM derivatives were assayed against various glycosidases, which allowed a systematic evaluation of their glycosidase inhibition profiles. Though N-substitution of DIM decreased their α-mannosidase inhibitory activities, some of the derivatives showed significant inhibition of other glycosidases.
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Inibidores Enzimáticos/síntese química , Inibidores Enzimáticos/farmacologia , Glicosídeo Hidrolases/antagonistas & inibidores , Manitol/análogos & derivados , Animais , Inibidores Enzimáticos/química , Glicosídeo Hidrolases/metabolismo , Humanos , Imino Furanoses/síntese química , Imino Furanoses/química , Imino Furanoses/farmacologia , Concentração Inibidora 50 , Manitol/síntese química , Manitol/química , Manitol/farmacologia , Ratos , Swainsonina/químicaRESUMO
BACKGROUND: Bainbridge-Ropers syndrome (BRPS) is a recently described developmental disorder caused by de novo truncating mutations in the Additional sex combs-like 3 (ASXL3) gene. Only four cases have been reported in China and are limited to the analysis of its clinical abnormalities, medical imaging features and gene variation. The aim of this study was to investigate the clinical phenotype, imaging manifestations and genetic characteristics of BPRS syndrome caused by ASXL3 gene mutation. Clinical data, medical imaging data and gene test results of BRPS in infant patients were retrospectively analyzed, and related literature was summarized. CASE PRESENTATION: At the age of 8 months, brain MRI showed that the subarachnoid space of the forehead was widened, part of the sulci was deepened, and the corpus callosum was thin. The development quotient (DQ) was determined using the 0~6-year-old pediatric examination table of neuropsychological development at 6 months and 8 months. The DQ of both tests was less than 69. Whole-exome sequencing revealed a heterozygous frameshift mutation c.3493_3494deTG in exon 12 of the ASXL3 gene, resulting in the amino acid change p. (Cys1165Ter). No variation was present at this site in her parents. Sanger sequencing of family members validated this analysis, suggesting a de novo mutation. The de novo ASXL3 mutations generated stop codons and were predicted, in silico, to generate a truncated ASXL3. CONCLUSIONS: The main clinical features of the patient included psychomotor development retardation, difficulty in feeding, hypotonia, and special facial features. MRI features showed that brain development lagged behind that of normal children. Genetic testing is helpful in the early diagnosis of BRPS.
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Deficiências do Desenvolvimento , Fatores de Transcrição , Criança , China , Feminino , Humanos , Lactente , Mutação , Fenótipo , Estudos Retrospectivos , Fatores de Transcrição/genéticaRESUMO
BACKGROUND: Whole exome sequencing (WES) has been widely used in human genetics research. BGISEQ-500 is a recently established next-generation sequencing platform. However, the performance of BGISEQ-500 on WES is not well studied. In this study, we evaluated the performance of BGISEQ-500 on WES by side-to-side comparison with Hiseq4000, on well-characterized human sample NA12878. RESULTS: BGISEQ demonstrated similarly high reproducibility as Hiseq for variation detection. Also, the SNVs from BGISEQ data is highly consistent with Hiseq results (concordance 96.5%~ 97%). Variation detection accuracy was subsequently evaluated with data from the genome in a bottle project as the benchmark. Both platforms showed similar sensitivity and precision in SNV detection. While in indel detection, BGISEQ showed slightly higher sensitivity and lower precision. The impact of sequence depth and read length on variation detection accuracy was further analyzed, and showed that variation detection sensitivity still increasing when the sequence depth is larger than 100x, and the impact of read length is minor when using 100x data. CONCLUSIONS: This study suggested that BGISEQ-500 is a qualified sequencing platform for WES.
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Sequenciamento do Exoma/métodos , Sequenciamento de Nucleotídeos em Larga Escala/métodos , Variação Genética , Genoma Humano , Humanos , Mutação INDEL , Reprodutibilidade dos Testes , Sensibilidade e EspecificidadeRESUMO
Hepatogenous diabetes is a complex disease that is typified by the simultaneous presence of type 2 diabetes and many forms of liver disease. The chief pathogenic determinant in this pathophysiological network is insulin resistance (IR), an asymptomatic disease state in which impaired insulin signaling in target tissues initiates a variety of organ dysfunctions. However, pharmacotherapies targeting IR remain limited and are generally inapplicable for liver disease patients. Oleanolic acid (OA) is a plant-derived triterpenoid that is frequently used in Chinese medicine as a safe but slow-acting treatment in many liver disorders. Here, we utilized the congruent pharmacological activities of OA and glucagon-like-peptide 1 (GLP-1) in relieving IR and improving liver and pancreas functions and used a synthetic-biology-inspired design principle to engineer a therapeutic gene circuit that enables a concerted action of both drugs. In particular, OA-triggered short human GLP-1 (shGLP-1) expression in hepatogenous diabetic mice rapidly and simultaneously attenuated many disease-specific metabolic failures, whereas OA or shGLP-1 monotherapy failed to achieve corresponding therapeutic effects. Collectively, this work shows that rationally engineered synthetic gene circuits are capable of treating multifactorial diseases in a synergistic manner by multiplexing the targeting efficacies of single therapeutics.
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Diabetes Mellitus Tipo 2/etiologia , Diabetes Mellitus Tipo 2/terapia , Hepatopatias/complicações , Animais , Engenharia Celular , Linhagem Celular , Diabetes Mellitus Tipo 2/diagnóstico , Diabetes Mellitus Tipo 2/metabolismo , Modelos Animais de Doenças , Desenho de Fármacos , Regulação da Expressão Gênica/efeitos dos fármacos , Redes Reguladoras de Genes/efeitos dos fármacos , Engenharia Genética , Peptídeo 1 Semelhante ao Glucagon/farmacologia , Peptídeo 1 Semelhante ao Glucagon/uso terapêutico , Humanos , Resistência à Insulina , Hepatopatias/metabolismo , Masculino , Camundongos , Camundongos Transgênicos , Ácido Oleanólico/farmacologia , Ácido Oleanólico/uso terapêutico , Biologia SintéticaRESUMO
Parasitic diseases have a devastating, long-term impact on human health, welfare and food production worldwide. More than two billion people are infected with geohelminths, including the roundworms Ascaris (common roundworm), Necator and Ancylostoma (hookworms), and Trichuris (whipworm), mainly in developing or impoverished nations of Asia, Africa and Latin America. In humans, the diseases caused by these parasites result in about 135,000 deaths annually, with a global burden comparable with that of malaria or tuberculosis in disability-adjusted life years. Ascaris alone infects around 1.2 billion people and, in children, causes nutritional deficiency, impaired physical and cognitive development and, in severe cases, death. Ascaris also causes major production losses in pigs owing to reduced growth, failure to thrive and mortality. The Ascaris-swine model makes it possible to study the parasite, its relationship with the host, and ascariasis at the molecular level. To enable such molecular studies, we report the 273 megabase draft genome of Ascaris suum and compare it with other nematode genomes. This genome has low repeat content (4.4%) and encodes about 18,500 protein-coding genes. Notably, the A. suum secretome (about 750 molecules) is rich in peptidases linked to the penetration and degradation of host tissues, and an assemblage of molecules likely to modulate or evade host immune responses. This genome provides a comprehensive resource to the scientific community and underpins the development of new and urgently needed interventions (drugs, vaccines and diagnostic tests) against ascariasis and other nematodiases.
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Ascaris suum/genética , Genoma Helmíntico/genética , Animais , Antinematódeos , Ascaríase/tratamento farmacológico , Ascaríase/parasitologia , Ascaris suum/efeitos dos fármacos , Desenho de Fármacos , Genes de Helmintos/genética , Genômica , Anotação de Sequência Molecular , Terapia de Alvo MolecularRESUMO
OBJECTIVES: The purpose of this investigation was to examine the association between cognition disorders and microstructural white matter (WM) changes in maintenance hemodialysis end-stage renal disease (ESRD) patients. METHODS: Twenty-six maintenance hemodialysis ESRD patients and 28 healthy controls underwent diffusion tensor imaging (DTI), Mini Mental State Examination (MMSE), Trial Marking Test-A&B (TMT-A&B), and white matter hyperintensity (WMH) assessment. Tract-based spatial statistics (TBSS) analyses was performed to evaluate WM changes in the patients. Relationships between behavioural performances, clinical data, and the DTI index were tested, respectively, by correlation analysis at the voxel level. RESULTS: ESRD patients showed significant decreased fractional anisotropy (FA) in 14 WM regions, and increased mean diffusivity (MD) and radial diffusivity (RD) in widespread regions. Significant positive correlations between FA values and MMSE scores were found in the right anterior corona radiata and the left anterior thalamic radiation; significant negative correlations between the TMT-B time consumption and FA values were identified in the bilateral superior longitudinal fasciculus. Positive linear relationships between MD, RD values, and the duration of hemodialysis were found in several WM regions. CONCLUSION: Structural damages to radiation and associative fibre tracts, caused by brain oedema and WM demyelination, may account for the cognitive deficits in ESRD patients.
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Transtornos Cognitivos/etiologia , Falência Renal Crônica/complicações , Leucoencefalopatias/patologia , Diálise Renal/efeitos adversos , Adulto , Anisotropia , Edema Encefálico/complicações , Estudos de Casos e Controles , Transtornos Cognitivos/patologia , Imagem de Tensor de Difusão/métodos , Feminino , Humanos , Falência Renal Crônica/patologia , Leucoencefalopatias/psicologia , Masculino , Pessoa de Meia-Idade , Testes Neuropsicológicos , Adulto JovemRESUMO
Thellungiella salsuginea, a close relative of Arabidopsis, represents an extremophile model for abiotic stress tolerance studies. We present the draft sequence of the T. salsuginea genome, assembled based on ~134-fold coverage to seven chromosomes with a coding capacity of at least 28,457 genes. This genome provides resources and evidence about the nature of defense mechanisms constituting the genetic basis underlying plant abiotic stress tolerance. Comparative genomics and experimental analyses identified genes related to cation transport, abscisic acid signaling, and wax production prominent in T. salsuginea as possible contributors to its success in stressful environments.
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Adaptação Biológica/genética , Brassicaceae/genética , Brassicaceae/fisiologia , Genoma de Planta/genética , Plantas Tolerantes a Sal/genética , Ácido Abscísico/metabolismo , Sequência de Bases , Proteínas de Transporte de Cátions/genética , Biologia Computacional , Primers do DNA/genética , Duplicação Gênica/genética , Biblioteca Gênica , Genômica , Sequenciamento de Nucleotídeos em Larga Escala , Dados de Sequência Molecular , Filogenia , Reação em Cadeia da Polimerase em Tempo Real , Transdução de Sinais/genética , Especificidade da EspécieRESUMO
BACKGROUND: Riemerella anatipestifer is one of the most important pathogens of ducks. However, the molecular mechanisms of R. anatipestifer infection are poorly understood. In particular, the lack of genomic information from a variety of R. anatipestifer strains has proved severely limiting. RESULTS: In this study, we present the complete genomes of two R. anatipestifer strains, RA-CH-1 (2,309,519 bp, Genbank accession CP003787) and RA-CH-2 (2,166,321 bp, Genbank accession CP004020). Both strains are from isolates taken from two different sick ducks in the SiChuang province of China. A comparative genomics approach was used to identify similarities and key differences between RA-CH-1 and RA-CH-2 and the previously sequenced strain RA-GD, a clinical isolate from GuangDong, China, and ATCC11845. CONCLUSION: The genomes of RA-CH-2 and RA-GD were extremely similar, while RA-CH-1 was significantly different than ATCC11845. RA-CH-1 is 140,000 bp larger than the three other strains and has 16 unique gene families. Evolutionary analysis shows that RA-CH-1 and RA-CH-2 are closed and in a branch with ATCC11845, while RA-GD is located in another branch. Additionally, the detection of several iron/heme-transport related proteins and motility mechanisms will be useful in elucidating factors important in pathogenicity. This information will allow a better understanding of the phenotype of different R. anatipestifer strains and molecular mechanisms of infection.
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Genoma Bacteriano , Riemerella/genética , Composição de Bases , Mapeamento Cromossômico , Códon , Mutação INDEL , Família Multigênica , Filogenia , Polimorfismo de Nucleotídeo Único , Análise de Sequência de DNARESUMO
OBJECTIVES: To investigate the diagnostic performance of coronary computed tomographic angiography (CCTA) with prospective electrocardiograph (ECG) gating based on step-and-shoot (SAS), Flash and volume imaging modes. METHODS: We searched the electronic databases PubMed for all published studies regarding CCTA. We used an exact binomial rendition of the bivariate mixed-effects regression model developed for synthesis of diagnostic data. RESULTS: A total of 21,852 segments, 4,851 vessels and 1,375 patients were identified using database searches. Patient-level pooled sensitivity was 0.99 (95 % confidence interval [CI], 0.98-1.00); specificity was 0.88 (CI, 0.85-0.91). The results showed that the sensitivity and specificity for detection of significant stenosis did not differ in the three protocols (P = 0.24). No heterogeneity was found at the patient level for sensitivity (Q = 26.23; P = 0.12; I (2) = 27.56 % [CI, 0.00-67.02 %]) and specificity (Q = 19.54; P = 0.42; I (2) = 2.78 % [CI, 0.00-66.26 %]). CONCLUSIONS: CCTA with prospective ECG gating has similar high diagnostic value to rule out CAD in all three presented modes. KEY POINTS: ⢠The accuracy of CCTA with different prospective ECG gating is similar ⢠CCTA with prospective ECG gating is effective to exclude coronary artery disease ⢠The radiation dose of volume mode increases with higher heart rate.
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Angiografia Coronária/métodos , Doença da Artéria Coronariana/diagnóstico por imagem , Eletrocardiografia/métodos , Tomografia Computadorizada por Raios X/métodos , Doença da Artéria Coronariana/fisiopatologia , Humanos , Doses de Radiação , Reprodutibilidade dos TestesRESUMO
The formulation of science and technology financial policies directly influences the direction of national economic development. Quantitative evaluation of these policies is an important method to reflect the consistency and strengths and weaknesses of policy interrelations. This paper analyzes 16 science and technology financial policy documents issued by the Chinese central government from 2016 to 2022, using text analysis and content analysis to extract keyword frequencies, and constructs 9 primary variables and 34 secondary variables. For the first time, a PMC-AE index model for science and technology financial policies is established, and a quantitative evaluation is conducted on 5 significant policy documents out of the 16. The results show that, from an overall analysis, Policy 1 and Policy 4 are at a good level, while the other three policies are at an excellent level. From the analysis of individual policy PMC-AE indexes, the rankings in descending order are: P2 > P5 > P3 > P4 > P1. Overall, the policies effectively meet the needs of China's science and technology financial development, with P2, P3, and P5 being at an excellent level, P4 at a good level, and P1 at an acceptable level, mainly reflecting the need for improvement in aspects such as policy synchronization with the current stage, targeted entities, guiding fields, and policy content. It is recommended that Chinese government departments should focus on five aspects in policy formulation: building a talent system for science and technology finance, improving the quality of financial services, coordinating central and local financial policies, protecting intellectual property rights in science and technology finance, and strengthening financial supervision. This will be conducive to the effective implementation of science and technology financial policies.
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Ciência , Tecnologia , China , Tecnologia/economia , Ciência/economia , Humanos , Desenvolvimento EconômicoRESUMO
BACKGROUND: Physical, chemical, and biological factors in the environment constantly influence in vivo and in vitro biological processes, including diverse histone modifications involved in cancer and metabolism. However, the intricate mechanisms of acetylation regulation remain poorly elucidated. In mammalian spermatogenesis, acetylation plays a crucial role in repairing double-strand DNA breaks, regulating gene transcription, and modulating various signaling pathways. RESULTS: This review summarizes the histone acetylation sites in the mouse testis and provides a comprehensive overview of how histone acetylation is involved in different stages of spermatogenesis under the regulation by histone deacetylases. The regulatory functions of various class histone deacetylases during spermatogenesis and the crossroad between histone acetylation and other histone modifications are highlighted. It is imperative to understand the mechanisms of histone acetylation regulated by histone deacetylases in spermatogenesis, which facilitates to prevent and treat infertility-related diseases.