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1.
Am J Hematol ; 2024 May 30.
Artigo em Inglês | MEDLINE | ID: mdl-38816957

RESUMO

Prognostication in acute pulmonary embolism (PE) requires reliable markers. While cellular indices such as neutrophil-to-lymphocyte ratio (NLR), platelet-to-lymphocyte ratio (PLR), and systemic immune-inflammation index (SII) appear promising, their utility in PE prognostication needs further exploration. We utilized data from the RIETE registry and the Loyola University Medical Center (LUMC) to assess the prognostic value of NLR, PLR, and SII in acute PE, using logistic regression models. The primary outcome was 30-day all-cause mortality. We compared their prognostic value versus the simplified Pulmonary Embolism Severity Index (sPESI) alone. We included 10 085 patients from RIETE and 700 from the LUMC. Thirty-day mortality rates were 4.6% and 8.3%, respectively. On multivariable analysis, an elevated NLR (>7.0) was associated with increased mortality (adjusted odds ratio [aOR]: 3.46; 95% CI: 2.60-4.60), outperforming the PLR > 220 (aOR: 2.36; 95% CI: 1.77-3.13), and SII > 1600 (aOR: 2.52; 95% CI: 1.90-3.33). The c-statistic for NLR in patients with low-risk PE was 0.78 (95% CI: 0.69-0.86). Respective numbers were 0.66 (95% CI: 0.63-0.69) and 0.68 (95% CI: 0.59-0.76) for intermediate-risk and high-risk patients. These findings were mirrored in the LUMC cohort. Among 9810 normotensive patients in RIETE, those scoring 0 points in sPESI and with an NLR ≤ 7.0 (35% of the population) displayed superior sensitivity (97.1%; 95% CI: 95.5-98.7) and negative predictive value (99.7%; 95% CI: 99.5-99.8) than sPESI alone (87.1%; 95% CI: 83.9-90.3, and 98.7%; 95% CI: 98.4-99.1, respectively) for 30-day mortality. The NLR is a significant prognostic marker for 30-day mortality in PE patients, especially useful to identify patients with very low-risk PE.

2.
J Coll Physicians Surg Pak ; 34(4): 489-493, 2024 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-38576296

RESUMO

OBJECTIVE: To determine the outcomes of robotic surgeries using the Da Vinci robotic surgical system (DVSS) at Pakistan's largest urological tertiary healthcare system. STUDY DESIGN: Descriptive study. Place and Duration of the Study: Department of Minimally Invasive and Robotic Surgery, Division of Urology, Sindh Institute of Urology and Transplantation, Karachi, Pakistan, from March 2017 to December 2021. METHODOLOGY: Hospital records of patients who underwent robotic urological surgeries were assessed for their outcomes in terms of blood loss, mortality, system malfunction, and conversion to open surgery. Descriptive statistics were determined. RESULTS: A total of 550 procedures were performed. The mean age recorded was 39.58±16.83 years. The mean blood loss recorded was 255.611±353.57 ml; there were 3 cases of malfunction. Forty cases were converted to open surgery, and the mortality rate was 1.1%. CONCLUSION: Minimally invasive surgical techniques have high precision, fewer complications, and lower morbidity rates. Using DVSS for surgical interventions is both effective and safe. KEY WORDS: Minimally invasive surgery, Da Vinci robotic surgical system, Robotic surgery.


Assuntos
Procedimentos Cirúrgicos Robóticos , Humanos , Adulto Jovem , Adulto , Pessoa de Meia-Idade , Procedimentos Cirúrgicos Robóticos/métodos , Paquistão , Procedimentos Cirúrgicos Minimamente Invasivos/métodos , Estudos Retrospectivos
3.
ACS Omega ; 9(10): 11459-11470, 2024 Mar 12.
Artigo em Inglês | MEDLINE | ID: mdl-38497024

RESUMO

In this study, novel adsorbents were developed by functionalizing multiwalled carbon nanotubes with frankincense (Fr-fMWCNT) and adding iron oxide (Fe3O4) to the adsorbent (Fr-fMWCNT-Fe3O4). The morphology, surface characteristics, and chemical nature of the synthesized samples were analyzed by using various characterization techniques. The prepared adsorbents were then applied for the elimination of the toxic dye, crystal violet (CV), from water-based solutions by employing a batch adsorption method. The effectiveness of materials for the adsorption of CV was investigated by tuning various effective experimental parameters (adsorbent dosage, dye quantity, pH, and contact time). In order to derive adsorption isotherms, the Langmuir and Freundlich adsorption models were investigated and compared. The Fr-fMWCNT and Fr-fMWCNT-Fe3O4 were found to remove 85 and 95% of the CV dye within 30 min of the adsorption experiment at pH 6, respectively. It was found that a pseudo-second-order reaction rate was consistent with the experimental adsorption kinetics. The equilibrium data demonstrated that the Langmuir model adequately explained the adsorption behavior of the CV dye on the Fr-fMWCNT and Fr-fMWCNT-Fe3O4 surfaces, respectively. According to the Langmuir study, the highest adsorption capacities of the dye are 434 mg/g for Fr-fMWCNT and 500 mg/g for Fr-fMWCNT-Fe3O4. Remediation of the CV dye using our novel composite materials has not been reported previously in the literature. The synthesized Fr-fMWCNT and Fr-fMWCNT-Fe3O4 adsorbents can be economical and green materials for the adsorptive elimination of CV dye from wastewater.

4.
J Colloid Interface Sci ; 659: 718-727, 2024 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-38211489

RESUMO

Herein, we present a novel microwave-assisted method for the synthesis of palladium nanoparticles (PdNPs) supported by Limonia acidissima Groff tree extract gum. The synthesized PdNPs were characterized using various analytical techniques, including FTIR, SEM, TEM, UV-visible, and powder XRD analyses. TEM and XRD analysis confirmed that the synthesized LAG-PdNPs are highly crystalline nature spherical shapes with an average size diameter of 7-9 nm. We employed these gum-capped PdNPs to investigate their peroxidase-like activity for colorimetric detection of hydrogen peroxide (H2O2) and glucose. The oxidation of 3,3',5,5'-tetramethylbenzidine (TMB) by H2O2, catalyzed by PdNPs, produces oxidation products quantified at 652 nm using spectrophotometry. The catalytic activity of PdNPs was optimized with respect to temperature and pH. The developed method exhibited a linear range of detection from 1 to 50 µm, with detection limits of 0.35 µm for H2O2 and 0.60 µm for glucose.


Assuntos
Colorimetria , Nanopartículas Metálicas , Nanopartículas Metálicas/química , Paládio/química , Peróxido de Hidrogênio/análise , Micro-Ondas , Glucose/análise
5.
J Endod ; 49(12): 1668-1675, 2023 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-37660765

RESUMO

INTRODUCTION: In situ assessments of neurotrophic factors and their associated molecular partners have not been explored to date, particularly in humans. The present investigation aimed to explore the expressional dysregulation of neurotrophic factors (nerve growth factor [NGF], brain derived neurotrophic factor [BDNF], and NT4/5), their receptors (TrkA and TrkB), and their modulators (USP36 and Nedd4-2) directly in irreversibly inflamed human pulp tissues. METHODS: Forty samples each of healthy and irreversibly inflamed pulp were extirpated for the study. Immunohistochemical examinations were carried out for the anatomic changes and expression of neurotrophic factors and partner proteins. Expression was digitally quantified using the IHC profiler module of ImageJ and deduced as optical density. Statistical analyses were carried out by GraphPad Prism. RESULTS: Decrease in nuclear and vessel diameters was observed in irreversibly inflamed pulp tissues. NGF and BDNF were found to be significantly upregulated in symptomatic irreversible pulpitis (SIP), whereas no significant difference was observed in the expression of TrkA and TrkB. Expression of Nedd4-2, USP36, and TrkA was found positively correlated with the NGF in healthy pulp tissues. However, in SIP, positive correlation was only observed between the expression of USP36 and NGF. Among the ligands, BDNF expression was found positively correlated with NGF in healthy pulp but not with NT4/5. In the case of SIP, no correlation was observed between any neurotrophic factors. CONCLUSIONS: Upregulation of NGF, BDNF, USP36 and Nedd4-2 in SIP indicates dysregulation in the molecular events underlying the disease biology and could be exploited as potential markers for the disease diagnosis.


Assuntos
Fator Neurotrófico Derivado do Encéfalo , Pulpite , Humanos , Fator Neurotrófico Derivado do Encéfalo/metabolismo , Receptores de Fator de Crescimento Neural/análise , Receptores de Fator de Crescimento Neural/metabolismo , Fator de Crescimento Neural , Receptores Proteína Tirosina Quinases/metabolismo , Ubiquitina Tiolesterase
6.
Biology (Basel) ; 12(7)2023 Jun 28.
Artigo em Inglês | MEDLINE | ID: mdl-37508357

RESUMO

Drosophila melanogaster has long been used to demonstrate the effect of inbreeding, particularly in relation to reproductive fitness and stress tolerance. In comparison, less attention has been given to exploring the influence of inbreeding on the innate behavior of D. melanogaster. In this study, multiple replicates of six different types of crosses were set in pair conformation of the laboratory-maintained wild-type D. melanogaster. This resulted in progeny with six different levels of inbreeding coefficients. Larvae and adult flies of varied inbreeding coefficients were subjected to different behavioral assays. In addition to the expected inbreeding depression in the-egg to-adult viability, noticeable aberrations were observed in the crawling and phototaxis behaviors of larvae. Negative geotactic behavior as well as positive phototactic behavior of the flies were also found to be adversely affected with increasing levels of inbreeding. Interestingly, positively phototactic inbred flies demonstrated improved learning compared to outbred flies, potentially the consequence of purging. Flies with higher levels of inbreeding exhibited a delay in the manifestation of aggression and courtship. In summary, our findings demonstrate that inbreeding influences the innate behaviors in D. melanogaster, which in turn may affect the overall biological fitness of the flies.

7.
Molecules ; 28(11)2023 Jun 01.
Artigo em Inglês | MEDLINE | ID: mdl-37298968

RESUMO

Aquatic pollution, which includes organic debris and heavy metals, is a severe issue for living things. Copper pollution is hazardous to people, and there is a need to develop effective methods for eliminating it from the environment. To address this issue, a novel adsorbent composed of frankincense-modified multi-walled carbon nanotubes (Fr-MMWCNTs) and Fe3O4 [Fr-MWCNT-Fe3O4] was created and subjected to characterization. Batch adsorption tests showed that Fr-MWCNT-Fe3O4 had a maximum adsorption capacity of 250 mg/g at 308 K and could efficiently remove Cu2+ ions over a pH range of 6 to 8. The adsorption process followed the pseudo-second-order and Langmuir models, and its thermodynamics were identified as endothermic. Functional groups on the surface of modified MWCNTs improved their adsorption capacity, and a rise in temperature increased the adsorption efficiency. These results highlight the Fr-MWCNT-Fe3O4 composites' potential as an efficient adsorbent for removing Cu2+ ions from untreated natural water sources.


Assuntos
Franquincenso , Nanotubos de Carbono , Poluentes Químicos da Água , Purificação da Água , Humanos , Cobre/química , Nanotubos de Carbono/química , Poluentes Químicos da Água/química , Cinética , Adsorção , Nanopartículas Magnéticas de Óxido de Ferro , Concentração de Íons de Hidrogênio , Purificação da Água/métodos
8.
J Pak Med Assoc ; 73(5): 1117-1119, 2023 May.
Artigo em Inglês | MEDLINE | ID: mdl-37218248

RESUMO

Mixed epithelial and stromal tumour (MEST) is a rare entity with an incidence of 0.2% among renal cancers. It has strong predilection towards females with a 1:6 male to female ratio, the tumour is cystic with some solid component with biphasic proliferation of stromal and epithelial cells. The case of a 37-years-old female is presented with right lumbar pain since 3 months. The family history was unremarkable. The routine workup revealed mild neutrophilia and borderline Echinococcus antibody titres. Ultrasound revealed a complex cystic lesion with a solid component in the right kidney. CT scan with contrast confirmed a multiloculated mixed density lesion with daughter cysts arising from the middle lobe of the right kidney. Initial diagnosis of renal hydatid cyst was established and she underwent partial nephrectomy with excision of the cystic mass. Surprisingly the histopathology revealed mixed epithelial and stromal tumour.


Assuntos
Carcinoma de Células Renais , Cistos , Equinococose , Echinococcus , Neoplasias Renais , Neoplasias de Tecidos Moles , Masculino , Humanos , Feminino , Animais , Adulto , Neoplasias Renais/diagnóstico , Neoplasias Renais/cirurgia , Neoplasias Renais/patologia , Equinococose/diagnóstico , Equinococose/cirurgia , Rim/patologia
9.
Biotech Histochem ; 98(6): 382-390, 2023 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-37013448

RESUMO

Members of the RAS gene family frequently are mutated in cancers including oral squamous cell carcinoma (OSCC). We investigated the correlation of histological characteristics of OSCC with RAS gene mutations. We graded tumors and extracted genomic DNA from OSCC. The first two exons of KRAS, HRAS and NRAS genes were subjected to PCR amplification and DNA sequencing followed by bioinformatic analysis to explore the structural and functional impact of the mutations on encoding of proteins. Cellular and nuclear diameters in histological sections were varied in all grades of cancer. Using sequence analysis, we identified nonsynonymous mutations in both HRAS (G12S, G15C, D54H, Q61H, Q61L, E62D, E63D, Q70E, Q70V) and NRAS (Q22P, K88R). Stop codon mutations, however, were observed in KRAS. Spatial orientation of substituted amino acids was observed despite conservation of overall structure of variant proteins. Our findings suggest that KRAS may be mutated more frequently in OSCC compared to HRAS and NRAS. Also, the histological features of nuclear and cellular diameter differed significantly between the KRAS mutated and unmutated cases.


Assuntos
Carcinoma de Células Escamosas , Neoplasias de Cabeça e Pescoço , Neoplasias Bucais , Proteínas Proto-Oncogênicas p21(ras) , Humanos , Carcinoma de Células Escamosas/genética , Genes ras , Neoplasias de Cabeça e Pescoço/genética , Neoplasias Bucais/genética , Mutação , Proteínas Proto-Oncogênicas p21(ras)/genética , Carcinoma de Células Escamosas de Cabeça e Pescoço/genética
10.
Int. j. morphol ; 41(2): 383-388, abr. 2023. ilus
Artigo em Inglês | LILACS | ID: biblio-1440338

RESUMO

SUMMARY: In elasmobranch fishes, variations in gross structural organization of cerebellum has been extensively explored. The basic histological features of cerebellum although conserved in the group but the comparative account on subtle cellular variations is largely underestimated. The present study aims to explore the histological and cellular variations in different layers of cerebellar cortex of the representative elasmobranchs' species belonging to different habitat. Our findings showed that the histological architecture of cerebellar granular layer between the examined species varies noticeably. By and large increase cellular density were observed in all the layers of cerebellum in the representative species of shark compared to ray. The findings were then compared and discussed with reference to their habitat and behavior.


En los peces elasmobranquios, las variaciones en la organización estructural general del cerebelo se han explorado ampliamente. Las características histológicas básicas del cerebelo, aunque se conservan en el grupo, pero la descripción comparativa de las variaciones celulares sutiles es limitada. El presente estudio tiene como objetivo explorar las variaciones histológicas y celulares en diferentes capas de la corteza cerebelosa de las especies representativas de elasmobranquios pertenecientes a diferentes hábitats. Nuestros hallazgos mostraron que la arquitectura histológica de la capa granular del cerebelo entre las especies examinadas varía notablemente. Se observó un gran aumento de la densidad celular en todas las capas del cerebelo en las especies representativas de tiburón en comparación con la raya. Luego, los hallazgos se compararon y discutieron con referencia a su hábitat y comportamiento.


Assuntos
Animais , Cerebelo/anatomia & histologia , Elasmobrânquios/anatomia & histologia , Evolução Biológica
11.
Molecules ; 28(6)2023 Mar 07.
Artigo em Inglês | MEDLINE | ID: mdl-36985413

RESUMO

Diffuse Large B-Cell Lymphoma (DLBCL) is the most common form of non-Hodgkin's lymphoma (NHL). Elevated expression of c-MYC in DLBCL is associated with poor prognosis of the disease. In different cancers, c-MYC has been found regulated by different ubiquitin-specific proteases (USPs), but to date, the role of USPs in c-MYC regulation has not been investigated in DLBCL. In this study, in situ co expression of c-MYC and three candidates USPs, USP28, USP36 and USP37, have been investigated in both the ABC and GCB subtypes of DLBCL. This shows that USP37 expression is positively correlated with the c-MYC expression in the ABC subtype of DLBCL. Structurally, both c-MYC and USP37 has shown large proportion of intrinsically disordered regions, minimizing their chances for full structure crystallization. Peptide array and docking simulations has shown that N-terminal region of c-MYC interacts directly with residues within and in proximity of catalytically active C19 domain of the USP37. Given the structural properties of the interaction sites in the c-MYC-USP37 complex, a peptidyl inhibitor has been designed. Molecular docking has shown that the peptide fits well in the targeted site of c-MYC, masking most of its residues involved in the binding with USP37. The findings could further be exploited to develop therapeutic interventions against the ABC subtype of DLBCL.


Assuntos
Linfoma Difuso de Grandes Células B , Proteínas Proto-Oncogênicas c-myc , Humanos , Proteínas Proto-Oncogênicas c-myc/genética , Proteínas Proto-Oncogênicas c-myc/metabolismo , Proteases Específicas de Ubiquitina/genética , Simulação de Acoplamento Molecular , Linfoma Difuso de Grandes Células B/tratamento farmacológico , Linfoma Difuso de Grandes Células B/genética , Linfoma Difuso de Grandes Células B/metabolismo , Ubiquitina Tiolesterase/genética
12.
BMC Med Inform Decis Mak ; 23(1): 11, 2023 01 18.
Artigo em Inglês | MEDLINE | ID: mdl-36653779

RESUMO

BACKGROUND: Water quality has been compromised and endangered by different contaminants due to Pakistan's rapid population development, which has resulted in a dramatic rise in waterborne infections and afflicted many regions of Pakistan. Because of this, modeling and predicting waterborne diseases has become a hot topic for researchers and is very important for controlling waterborne disease pollution. METHODS: In our study, first, we collected typhoid and malaria patient data for the years 2017-2020 from Ayub Medical Hospital. The collected data set has seven important input features. In the current study, different ML models were first trained and tested on the current study dataset using the tenfold cross-validation method. Second, we investigated the importance of input features in waterborne disease-positive case detection. The experiment results showed that Random Forest correctly predicted malaria-positive cases 60% of the time and typhoid-positive cases 77% of the time, which is better than other machine-learning models. In this research, we have also investigated the input features that are more important in the prediction and will help analyze positive cases of waterborne disease. The random forest feature selection technique has been used, and experimental results have shown that age, history, and test results play an important role in predicting waterborne disease-positive cases. In the end, we concluded that this interesting study could help health departments in different areas reduce the number of people who get sick from the water.


Assuntos
Febre Tifoide , Doenças Transmitidas pela Água , Humanos , Doenças Transmitidas pela Água/diagnóstico , Doenças Transmitidas pela Água/epidemiologia , Febre Tifoide/diagnóstico , Febre Tifoide/epidemiologia , Aprendizado de Máquina
13.
Ir J Med Sci ; 192(3): 1277-1280, 2023 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-35849315

RESUMO

OBJECTIVE: Audit is a recognised tool for evaluating the performance and improving the quality of health services. In Ireland and the UK, clear resources are available outlining audit elements. This study was undertaken to evaluate paediatric audits published from 2007 to 2020 to determine the adherence level to the definition of audit and to assess the quality of audit standards. DESIGN: PUBMED, MEDLINE and CINAHL databases were searched to identify relevant articles published in the English language. Each was reviewed to assess whether the following criteria were met: (1) a paediatric healthcare topic was described, (2) practice was reviewed, (3) the standard was specified, (4) an intervention was made and data collection was repeated to assess improvement. The quality of the standard for each true audit was graded utilising the Oxford Centre for Evidence-Based Medicine Levels of Evidence. RESULTS: Of 1230 published paediatric healthcare articles reviewed, 144 (11.4%) fulfilled the full criteria of an audit. Sixty-three (43.8%) true audits used the highest quality of evidence (level 1a and 1b), predominantly international or national guidelines. Fifty-six (38.9%) audits used the lowest quality of evidence (level 5), predominantly expert opinion. CONCLUSIONS: There is a mismatch between the common usage of the term audit, and the definition, despite its incorporation into training curricula and institutional support. Many articles published as audits do not adhere to the definition of audit. There are variable levels of evidence supporting the standards utilised in published true audits.


Assuntos
Instalações de Saúde , Auditoria Médica , Criança , Humanos , Coleta de Dados , Irlanda
14.
Polymers (Basel) ; 14(16)2022 Aug 10.
Artigo em Inglês | MEDLINE | ID: mdl-36015519

RESUMO

To effectively counter the evolving threat of SARS-CoV-2 variants, modifications and/or redesigning of mRNA vaccine construct are essentially required. Herein, the design and immunoinformatic assessment of a candidate novel mRNA vaccine construct, DOW-21, are discussed. Briefly, immunologically important domains, N-terminal domain (NTD) and receptor binding domain (RBD), of the spike protein of SARS-CoV-2 variants of concern (VOCs) and variants of interest (VOIs) were assessed for sequence, structure, and epitope variations. Based on the assessment, a novel hypothetical NTD (h-NTD) and RBD (h-RBD) were designed to hold all overlapping immune escape variations. The construct sequence was then developed, where h-NTD and h-RBD were intervened by 10-mer gly-ala repeat and the terminals were flanked by regulatory sequences for better intracellular transportation and expression of the coding regions. The protein encoded by the construct holds structural attributes (RMSD NTD: 0.42 Å; RMSD RBD: 0.15 Å) found in the respective domains of SARS-CoV-2 immune escape variants. In addition, it provides coverage to the immunogenic sites of the respective domains found in SARS-CoV-2 variants. Later, the nucleotide sequence of the construct was optimized for GC ratio (56%) and microRNA binding sites to ensure smooth translation. Post-injection antibody titer was also predicted (~12000 AU) to be robust. In summary, the construct proposed in this study could potentially provide broad spectrum coverage in relation to SARS-CoV-2 immune escape variants.

15.
Int J Biol Macromol ; 209(Pt A): 912-922, 2022 Jun 01.
Artigo em Inglês | MEDLINE | ID: mdl-35447260

RESUMO

We report a facile microwave-assisted synthesis of palladium nanoparticles (PdNPs) using Bael gum (BG) and it's carboxymethylated (CMBG) derivative. The prepared nanoparticles (BG@PdNPs and CMBG@PdNPs) were evaluated for antibacterial and catalytic activity in the reduction of organic dye pollutants. The developed synthetic method is simple, low cost and eco-friendly, wherein the process requires no additional reducing or capping agents. The CMBG was prepared via etherification reaction between BG and monochloroacetic acid using Williamson synthesis method. The PdNPs were synthesized using BG and CMBG as stabilizers and reducing agents. The PdNPs were found to be well dispersed spherical, with the crystalline size of the order of 7-21 nm. The results showed that the CMBG@PdNPs were smaller in size (7 ± 2 nm) than those capped with BG@PdNPs (10 ± 2 nm). The catalytic ability of CMBG@PdNPs was examined for the reduction of Methyl Orange (MO), Methyl Red(MR), and Rhodamine-B (RhB) in the presence of NaBH4. The results showed that CMBG@PdNPs exhibited a higher catalytic ability than BG@PdNPs. Moreover, it was found that CMBG@PdNPs served several times as a retrievable and reusable catalyst which is stable even after six cycles of reaction. The CMBG@PdNPs and BG@PdNPs showed excellent antibacterial activity. The results indicate that CMBG@PdNPs have greater potential application as a catalyst in the reduction of organic pollutants and antibacterial activity.


Assuntos
Poluentes Ambientais , Nanopartículas Metálicas , Antibacterianos/farmacologia , Catálise , Nanopartículas Metálicas/química , Paládio/química
16.
PLoS One ; 17(2): e0263678, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35213571

RESUMO

SARS-CoV-2 has spread throughout the world since its discovery in China, and Malaysia is no exception. WGS has been a crucial approach in studying the evolution and genetic diversity of SARS-CoV-2 in the ongoing pandemic. Despite considerable number of SARS-CoV-2 genome sequences have been submitted to GISAID and NCBI databases, there is still scarcity of data from Malaysia. This study aims to report new Malaysian lineages of the virus, responsible for the sustained spikes in COVID-19 cases during the third wave of the pandemic. Patients with nasopharyngeal and/or oropharyngeal swabs confirmed COVID-19 positive by real-time RT-PCR with CT value < 25 were chosen for WGS. The selected SARS-CoV-2 isolates were then sequenced, characterized and analyzed along with 986 sequences of the dominant lineages of D614G variants currently circulating throughout Malaysia. The prevalence of clade GH and G formed strong ground for the presence of two Malaysian lineages of AU.2 and B.1.524 that has caused sustained spikes of cases in the country. Statistical analysis on the association of gender and age group with Malaysian lineages revealed a significant association (p <0.05). Phylogenetic analysis revealed dispersion of 41 lineages, of these, 22 lineages are still active. Mutational analysis showed presence of unique G1223C missense mutation in transmembrane domain of the spike protein. For better understanding of the SARS-CoV-2 evolution in Malaysia especially with reference to the reported lineages, large scale studies based on WGS are warranted.


Assuntos
COVID-19/virologia , Genoma Viral , Mutação , Nasofaringe/virologia , SARS-CoV-2/genética , Humanos , Malásia , Glicoproteína da Espícula de Coronavírus/genética , Sequenciamento Completo do Genoma
17.
J Med Virol ; 93(7): 4461-4468, 2021 07.
Artigo em Inglês | MEDLINE | ID: mdl-33704818

RESUMO

A newly emerged strain of SARS-CoV-2 of B.1.1.7 lineage has caused a significant surge in the SARS-CoV-2 infections in the UK. In this study, changes in the epitopes of spike and orf8 proteins in SARS-CoV-2 of B.1.1.7 lineage were investigated. Genomic alignment of the SARS-CoV-2/B.1.1.7 with SARS-CoV-2/Wuhan showed the presence of several mutations in orf1a/b, spike, orf8, and N proteins of SARS-CoV-2/B.1.1.7. Molecular models of spike and orf8 proteins were constructed by homology modeling. Superimposition between the spike proteins of SARS-CoV-2/Wuhan and SARS-CoV-2/B.1.1.7 showed noticeable variations in the spatial orientation in Val70-Asn74 and Thr250-Ser255 regions. This may have also resulted in the extension of the epitopic region at Ser244-Gly249 in the SARS-CoV-2/B.1.1.7 spike protein. Superimposition of the SARS-CoV-2/B.1.1.7 spike protein over Fab-spike protein complexes of SARS-CoV-2/Wuhan also showed subtle variations in the antibody binding affinity targeting the N-terminal domain of the spike protein. Epitopic variations were also observed between the corresponding orf8 regions of SARS-CoV-2/Wuhan and SARS-CoV-2/B.1.1.7. Moreover, the presence of a stop codon at position 27 in orf8 connotes the emergence of two frames (orf8a and orf8b) in SARS-CoV-2, which further hampers its extracellular secretion, and in turn, immunogenicity. The findings of the present study could further be used to develop targeted immunotherapeutics.


Assuntos
COVID-19/imunologia , SARS-CoV-2/imunologia , Glicoproteína da Espícula de Coronavírus/genética , Glicoproteína da Espícula de Coronavírus/imunologia , Proteínas Virais/genética , Proteínas Virais/imunologia , Sequência de Aminoácidos/genética , Epitopos/imunologia , Genoma Viral/genética , Humanos , Evasão da Resposta Imune/imunologia , Imunoterapia/métodos , SARS-CoV-2/genética , Alinhamento de Sequência , Reino Unido
18.
AIMS Microbiol ; 6(3): 350-360, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-33029570

RESUMO

Entry of SARS-CoV-2, etiological agent of COVID-19, in the host cell is driven by the interaction of its spike protein with human ACE2 receptor and a serine protease, TMPRSS2. Although complex between SARS-CoV-2 spike protein and ACE2 has been structurally resolved, the molecular details of the SARS-CoV-2 and TMPRSS2 complex are still elusive. TMPRSS2 is responsible for priming of the viral spike protein that entails cleavage of the spike protein at two potential sites, Arg685/Ser686 and Arg815/Ser816. The present study aims to investigate the conformational attributes of the molecular complex between TMPRSS2 and SARS-CoV-2 spike protein, in order to discern the finer details of the priming of viral spike protein. Briefly, full length structural model of TMPRSS2 was developed and docked against the resolved structure of SARS-CoV-2 spike protein with directional restraints of both cleavage sites. The docking simulations showed that TMPRSS2 interacts with the two different loops of SARS-CoV-2 spike protein, each containing different cleavage sites. Key functional residues of TMPRSS2 (His296, Ser441 and Ser460) were found to interact with immediate flanking residues of cleavage sites of SARS-CoV-2 spike protein. Compared to the N-terminal cleavage site (Arg685/Ser686), TMPRSS2 region that interact with C-terminal cleavage site (Arg815/Ser816) of the SARS-CoV-2 spike protein was predicted as relatively more druggable. In summary, the present study provides structural characteristics of molecular complex between human TMPRSS2 and SARS-CoV-2 spike protein and points to the candidate drug targets that could further be exploited to direct structure base drug designing.

19.
Data Brief ; 32: 106082, 2020 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-32775582

RESUMO

Animal modelling for infectious diseases is critical to understand the biology of the pathogens including viruses and to develop therapeutic strategies against it. Herein, we present the sequence homology and expression data analysis of proteins found in Drosophila melanogaster that are orthologous to human proteins, reported as components of SARS-CoV-2/Human interactome. The dataset enlists sequence homology, query coverage, domain conservation, OrthoMCL and Ensembl Genome Browser support of 326 proteins in D.melanogaster that are potentially orthologous to 417 human proteins reported for their direct physical interactions with 28 proteins encoded by SARS-CoV-2 genome. Expression of these D.melanogaster orthologous genes in 26 anatomical positions are also plotted as heat maps in 27 sets, corresponding to the potential protein interactors for each viral protein. The data could be used to direct experiments and potentially predict their phenotypic and molecular outcome in order to dissect the biological roles and molecular functionality of SARS-CoV-2 proteins in a convenient animal model system like D.melanogaster.

20.
Comput Biol Chem ; 88: 107349, 2020 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-32763796

RESUMO

Aggression is a complex behavior, underpinned by cross talk between several biomolecules. To date a composite molecular network of the behavioral disorder has not been constructed. The present study aims to develop the same from the system network analyses recruiting genes with empirical evidence demonstrating their role in the incidence and progression of aggression. In short, 327 genes were recruited in the study after extensive literature survey and subsequent shortlisting by sieving out the comorbidities like cancer and other pathological and physiological ailments, other languages and repeated citations. Subsequent String network analysis coalesces 275 genes in a network with 2223 edges. The developed network was then subjected to delineate modules using MCODE which via gene clustering on the basis of gene ontology segregate all genes into 14 modules. Of these, as expected top 5 modules involved entailing of neuronal signaling pathways with redundant repetitions. Finally, 10 genes (known) were picked randomly, accounting average module size, and subjected to the network analysis with 100,000 bootstrap replicates. This results in the detection of certain novel genes that lacks empirical evidence for their association with the aggression. Amongst those, most notable are genes involved in protein turnover regulation like UBC, UBA, mitogenic proteins such as Rho and Myc, transcription factors like Tp53. The findings in turn fill caveats in the molecular resolution of cross talk that underscore the development of aggressive behavior and may then be exploited as screening biomarker and/or therapeutic intervention for aggression.


Assuntos
Redes Reguladoras de Genes/genética , Fatores de Transcrição/genética , Humanos , Agregados Proteicos
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