1
|
Laatri S, El Khayari S, Qriouet Z. Exploring the molecular aspect and updating evolutionary approaches to the DNA polymerase enzymes for biotechnological needs: A comprehensive review. Int J Biol Macromol 2024; 276:133924. [PMID: 39033894 DOI: 10.1016/j.ijbiomac.2024.133924] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2024] [Revised: 07/07/2024] [Accepted: 07/15/2024] [Indexed: 07/23/2024]
Abstract
DNA polymerases are essential enzymes that play a key role in living organisms, as they participate in the synthesis and maintenance of the DNA molecule. The intrinsic properties of these enzymes have been widely observed and studied to understand their functions, activities, and behavior, which has allowed their natural power in DNA synthesis to be exploited in modern biotechnology, to the point of making them true pillars of the field. In this context, the laboratory evolution of these enzymes, either by directed evolution or rational design, has led to the generation of a wide range of new DNA polymerases with novel properties, suitable for a variety of biotechnological needs. In this review, we examine DNA polymerases at the molecular level, their biotechnological use, and their evolutionary methods in relation to the novel properties sought, providing a chronological selection of evolved DNA polymerases cited in the literature that we consider to be of great interest. To our knowledge, this work is the first to bring together the molecular, functional and evolutionary aspects of the DNA polymerase enzyme. We believe it will be of great interest to researchers whose aim is to produce new lines of evolved DNA polymerases.
Collapse
Affiliation(s)
- Said Laatri
- Microbiology and Molecular Biology Laboratory, Faculty of Sciences, Mohammed V-Souissi University, Rabat 10100, Morocco.
| | | | - Zidane Qriouet
- Pharmacology and Toxicology Laboratory, Faculty of Medicine and Pharmacy, Mohammed V-Souissi University, Rabat 10100, Morocco
| |
Collapse
|
2
|
Bathla P, Mujawar A, De A, Sandanaraj BS. Development of Noninvasive Activity-Based Protein Profiling-Bioluminescence Resonance Energy Transfer Platform Technology Enables Target Engagement Studies with Absolute Specificity in Living Systems. ACS Pharmacol Transl Sci 2024; 7:375-383. [PMID: 38357276 PMCID: PMC10863430 DOI: 10.1021/acsptsci.3c00231] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2023] [Revised: 12/06/2023] [Accepted: 12/18/2023] [Indexed: 02/16/2024]
Abstract
Noninvasive, real-time, longitudinal imaging of protein functions in living systems with unprecedented specificity is one of the critical challenges of modern biomedical research. Toward that goal, here, we report a platform fusion technology called activity-based protein profiling-bioluminescence resonance energy transfer (ABPP-BRET). This method provides an opportunity to study the post-translational modification of a target protein in real time in living systems in a longitudinal manner. This semisynthetic BRET biosensor method is used for target engagement studies and further for inhibitor profiling in live cells. The simplicity of this method coupled with the critical physical distance-dependent BRET readout turned out to be a powerful method, thus pushing the activity-based protein profiling technology to the next level.
Collapse
Affiliation(s)
- Punita Bathla
- Department
of Biology, Department of Chemistry, Indian
Institute of Science Education and Research, Pune 411008, India
| | - Aaiyas Mujawar
- Molecular
Functional Imaging Lab, Advanced Centre
for Treatment Research Education in Cancer (ACTREC), Navi Mumbai 410210, India
- Homi
Bhabha National Institute, Mumbai 400094, India
| | - Abhijit De
- Molecular
Functional Imaging Lab, Advanced Centre
for Treatment Research Education in Cancer (ACTREC), Navi Mumbai 410210, India
- Homi
Bhabha National Institute, Mumbai 400094, India
| | - Britto S. Sandanaraj
- Department
of Biology, Department of Chemistry, Indian
Institute of Science Education and Research, Pune 411008, India
| |
Collapse
|
3
|
Wong S, Jimenez S, Slavcev RA. Construction and characterization of a novel miniaturized filamentous phagemid for targeted mammalian gene transfer. Microb Cell Fact 2023; 22:124. [PMID: 37430278 DOI: 10.1186/s12934-023-02135-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2023] [Accepted: 06/24/2023] [Indexed: 07/12/2023] Open
Abstract
BACKGROUND As simplistic proteinaceous carriers of genetic material, phages offer great potential as targeted vectors for mammalian transgene delivery. The filamentous phage M13 is a single-stranded DNA phage with attractive characteristics for gene delivery, including a theoretically unlimited DNA carrying capacity, amenability to tropism modification via phage display, and a well-characterized genome that is easy to genetically modify. The bacterial backbone in gene transfer plasmids consists of elements only necessary for amplification in prokaryotes, and, as such, are superfluous in the mammalian cell. These problematic elements include antibiotic resistance genes, which can disseminate antibiotic resistance, and CpG motifs, which are inflammatory in animals and can lead to transgene silencing. RESULTS Here, we examined how M13-based phagemids could be improved for transgene delivery by removing the bacterial backbone. A transgene cassette was flanked by isolated initiation and termination elements from the phage origin of replication. Phage proteins provided in trans by a helper would replicate only the cassette, without any bacterial backbone. The rescue efficiency of "miniphagemids" from these split origins was equal to, if not greater than, isogenic "full phagemids" arising from intact origins. The type of cassette encoded by the miniphagemid as well as the choice of host strain constrained the efficiency of phagemid rescue. CONCLUSIONS The use of two separated domains of the f1 ori improves upon a single wildtype origin while still resulting in high titres of miniphagemid gene transfer vectors. Highly pure lysates of miniaturized phagemids could be rapidly obtained in a straightforward procedure without additional downstream processing.
Collapse
Affiliation(s)
- Shirley Wong
- School of Pharmacy, University of Waterloo, Waterloo, Canada.
| | - Salma Jimenez
- School of Pharmacy, University of Waterloo, Waterloo, Canada
| | | |
Collapse
|
4
|
Zhang J, Chen B, Fang X. 3D Structural Analysis of Long Noncoding RNA by Small Angle X-ray Scattering and Computational Modeling. Methods Mol Biol 2023; 2568:147-163. [PMID: 36227567 DOI: 10.1007/978-1-0716-2687-0_10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Small angle X-ray scattering (SAXS) has been widely applied as an enabling integrative technique for comprehensive analysis of the structure of biomacromolecules by multiple, complementary techniques in solution. SAXS in combination with computational modeling can be a powerful strategy bridging the secondary and 3D structural analysis of large RNAs, including the long noncoding RNAs (lncRNA). Here, we outline the major procedures and techniques in the combined use of SAXS and computational modeling for 3D structural characterization of a lncRNA, the subgenomic flaviviral RNA from Zika virus. lncRNA production and purification, RNA buffer and sample preparation for SAXS experiments, SAXS data collection and analysis, SAXS-aided RNA 3D structure prediction, and computational modeling are described.
Collapse
Affiliation(s)
- Jie Zhang
- Beijing Advanced Innovation Center for Structural Biology, School of Life Sciences, Tsinghua University, Beijing, China
| | - Binxian Chen
- Beijing Advanced Innovation Center for Structural Biology, School of Life Sciences, Tsinghua University, Beijing, China
| | - Xianyang Fang
- Beijing Advanced Innovation Center for Structural Biology, School of Life Sciences, Tsinghua University, Beijing, China.
| |
Collapse
|
5
|
Baghel KR, Saravanan BC, Jeeva K, Chandra D, Singh KP, Ghosh S, Tewari AK. Oriental theileriosis associated with a new genotype of Theileria orientalis in buffalo (Bubalus bubalis) calves in Uttar Pradesh, India. Ticks Tick Borne Dis 2023; 14:102077. [PMID: 36402047 DOI: 10.1016/j.ttbdis.2022.102077] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2021] [Revised: 09/01/2022] [Accepted: 11/04/2022] [Indexed: 11/11/2022]
Abstract
Theileria orientalis is known to cause a benign infection in cattle and buffalo (Bubalus bubalis). However, the Ikeda and Chitose genotypes of the parasite cause lethal disease in beef and dairy cattle. Recently an outbreak of clinical oriental theileriosis occurred in buffalo calves in a Government Animal Husbandry and Agricultural Farm located in Uttar Pradesh, India. Examination of Giemsa stained thin blood smears revealed typical rod-shaped T. orientalis piroplasms in the erythrocytes. The clinical signs included pyrexia, nasal discharge, lacrimation, lethargy, inappetence and anaemia with varying degrees of paleness of the visible mucous membranes. Vascular congestion in internal organs, pulmonary emphysema and consolidation of lungs, focal areas of necrosis in the heart with mononuclear cell infiltration, focal mononuclear cell aggregation in the cortex and tubular degeneration of the kidney were significant necropsy findings. The T. orientalis major piroplasm surface protein (MPSP) gene was amplified by polymerase chain reaction (PCR) using specific primers. The nucleotide sequence analysis of the PCR product revealed 84.8% identity between the T. orientalis Uttar Pradesh isolate and other reference genotypes available in the public domain. Furthermore, the phylogenetic analysis of the MPSP gene sequence ratified that this is a new genotype of T. orientalis. This is the first report of a clinical outbreak of oriental theileriosis in Indian buffalo calves caused by a novel genotype of T. orientalis.
Collapse
Affiliation(s)
- K R Baghel
- CADRAD, Indian Veterinary Research Institute, Izatnagar 243122, India
| | - B C Saravanan
- CADRAD, Indian Veterinary Research Institute, Izatnagar 243122, India.
| | - K Jeeva
- Division of Parasitology, Indian Veterinary Research Institute, Izatnagar 243122, India
| | - Dinesh Chandra
- Division of Parasitology, Indian Veterinary Research Institute, Izatnagar 243122, India
| | - K P Singh
- CADRAD, Indian Veterinary Research Institute, Izatnagar 243122, India
| | - S Ghosh
- Division of Parasitology, Indian Veterinary Research Institute, Izatnagar 243122, India
| | - A K Tewari
- Division of Parasitology, Indian Veterinary Research Institute, Izatnagar 243122, India
| |
Collapse
|
6
|
Gerrits T, Brouwer IJ, Dijkstra KL, Wolterbeek R, Bruijn JA, Scharpfenecker M, Baelde HJ. Endoglin Is an Important Mediator in the Final Common Pathway of Chronic Kidney Disease to End-Stage Renal Disease. Int J Mol Sci 2022; 24:ijms24010646. [PMID: 36614087 PMCID: PMC9820946 DOI: 10.3390/ijms24010646] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Revised: 12/15/2022] [Accepted: 12/28/2022] [Indexed: 12/31/2022] Open
Abstract
Chronic kidney disease (CKD) is a slow-developing, progressive deterioration of renal function. The final common pathway in the pathophysiology of CKD involves glomerular sclerosis, tubular atrophy and interstitial fibrosis. Transforming growth factor-beta (TGF-β) stimulates the differentiation of fibroblasts towards myofibroblasts and the production of extracellular matrix (ECM) molecules, and thereby interstitial fibrosis. It has been shown that endoglin (ENG, CD105), primarily expressed in endothelial cells and fibroblasts, can function as a co-receptor of TGF signaling. In several human organs, endoglin tends to be upregulated when chronic damage and fibrosis is present. We hypothesize that endoglin is upregulated in renal interstitial fibrosis and plays a role in the progression of CKD. We first measured renal endoglin expression in biopsy samples obtained from patients with different types of CKD, i.e., IgA nephropathy, focal segmental glomerulosclerosis (FSGS), diabetic nephropathy (DN) and patients with chronic allograft dysfunction (CAD). We showed that endoglin is upregulated in CAD patients (p < 0.001) and patients with DN (p < 0.05), compared to control kidneys. Furthermore, the amount of interstitial endoglin expression correlated with eGFR (p < 0.001) and the amount of interstitial fibrosis (p < 0.001), independent of the diagnosis of the biopsies. Finally, we investigated in vitro the effect of endoglin overexpression in TGF-β stimulated human kidney fibroblasts. Overexpression of endoglin resulted in an enhanced ACTA2, CCN2 and SERPINE1 mRNA response (p < 0.05). It also increased the mRNA and protein upregulation of the ECM components collagen type I (COL1A1) and fibronectin (FN1) (p < 0.05). Our results suggest that endoglin is an important mediator in the final common pathway of CKD and could be used as a possible new therapeutic target to counteract the progression towards end-stage renal disease (ESRD).
Collapse
Affiliation(s)
- Tessa Gerrits
- Department of Pathology, Leiden University Medical Centre, 2333 ZA Leiden, The Netherlands
| | - Isabella J. Brouwer
- Department of Pathology, Leiden University Medical Centre, 2333 ZA Leiden, The Netherlands
| | - Kyra L. Dijkstra
- Department of Pathology, Leiden University Medical Centre, 2333 ZA Leiden, The Netherlands
| | - Ron Wolterbeek
- Department of Biomedical Data Sciences, Medical Statistics, Leiden University Medical Centre, 2333 ZA Leiden, The Netherlands
| | - Jan A. Bruijn
- Department of Pathology, Leiden University Medical Centre, 2333 ZA Leiden, The Netherlands
| | - Marion Scharpfenecker
- Department of Pathology, Leiden University Medical Centre, 2333 ZA Leiden, The Netherlands
| | - Hans J. Baelde
- Department of Pathology, Leiden University Medical Centre, 2333 ZA Leiden, The Netherlands
- Correspondence: ; Tel.: +31-(0)-71-526-4788
| |
Collapse
|
7
|
Al-Janabi SS, Shawky H, El-Waseif AA, Farrag AA, Abdelghany TM, El-Ghwas DE. Novel approach of amplification and cloning of bacterial cellulose synthesis (bcs) operon from Gluconoacetobacter hansenii. GENE REPORTS 2022. [DOI: 10.1016/j.genrep.2022.101577] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
8
|
Arif SM, Floto RA, Blundell TL. Using Structure-guided Fragment-Based Drug Discovery to Target Pseudomonas aeruginosa Infections in Cystic Fibrosis. Front Mol Biosci 2022; 9:857000. [PMID: 35433835 PMCID: PMC9006449 DOI: 10.3389/fmolb.2022.857000] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2022] [Accepted: 02/23/2022] [Indexed: 11/13/2022] Open
Abstract
Cystic fibrosis (CF) is progressive genetic disease that predisposes lungs and other organs to multiple long-lasting microbial infections. Pseudomonas aeruginosa is the most prevalent and deadly pathogen among these microbes. Lung function of CF patients worsens following chronic infections with P. aeruginosa and is associated with increased mortality and morbidity. Emergence of multidrug-resistant, extensively drug-resistant and pandrug-resistant strains of P. aeruginosa due to intrinsic and adaptive antibiotic resistance mechanisms has failed the current anti-pseudomonal antibiotics. Hence new antibacterials are urgently needed to treat P. aeruginosa infections. Structure-guided fragment-based drug discovery (FBDD) is a powerful approach in the field of drug development that has succeeded in delivering six FDA approved drugs over the past 20 years targeting a variety of biological molecules. However, FBDD has not been widely used in the development of anti-pseudomonal molecules. In this review, we first give a brief overview of our structure-guided FBDD pipeline and then give a detailed account of FBDD campaigns to combat P. aeruginosa infections by developing small molecules having either bactericidal or anti-virulence properties. We conclude with a brief overview of the FBDD efforts in our lab at the University of Cambridge towards targeting P. aeruginosa infections.
Collapse
Affiliation(s)
| | - R. Andres Floto
- Molecular Immunity Unit, Department of Medicine University of Cambridge, MRC-Laboratory of Molecular Biology, Cambridge, United Kingdom
- Cambridge Centre for Lung Infection, Royal Papworth Hospital, Cambridge, United Kingdom
| | - Tom L. Blundell
- Department of Biochemistry, University of Cambridge, Cambridge, United Kingdom
- *Correspondence: Tom L. Blundell,
| |
Collapse
|
9
|
Brunetti G, Kodešová R, Švecová H, Fér M, Nikodem A, Klement A, Grabic R, Šimůnek J. On the Use of Mechanistic Soil-Plant Uptake Models: A Comprehensive Experimental and Numerical Analysis on the Translocation of Carbamazepine in Green Pea Plants. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:2991-3000. [PMID: 33587851 PMCID: PMC8023655 DOI: 10.1021/acs.est.0c07420] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Revised: 02/04/2021] [Accepted: 02/07/2021] [Indexed: 05/04/2023]
Abstract
Food contamination is a major worldwide risk for human health. Dynamic plant uptake of pollutants from contaminated environments is the preferred pathway into the human and animal food chain. Mechanistic models represent a fundamental tool for risk assessment and the development of mitigation strategies. However, difficulty in obtaining comprehensive observations in the soil-plant continuum hinders their calibration, undermining their generalizability and raising doubts about their widespread applicability. To address these issues, a Bayesian probabilistic framework is used, for the first time, to calibrate and assess the predictive uncertainty of a mechanistic soil-plant model against comprehensive observations from an experiment on the translocation of carbamazepine in green pea plants. Results demonstrate that the model can reproduce the dynamics of water flow and solute reactive transport in the soil-plant domain accurately and with limited uncertainty. The role of different physicochemical processes in bioaccumulation of carbamazepine in fruits is investigated through Global Sensitivity Analysis, which shows how soil hydraulic properties and soil solute sorption regulate transpiration streams and bioavailability of carbamazepine. Overall, the analysis demonstrates the usefulness of mechanistic models and proposes a comprehensive numerical framework for their assessment and use.
Collapse
Affiliation(s)
- Giuseppe Brunetti
- Institute
for Soil Physics and Rural
Water Management, University of Natural
Resources and Life Sciences, Vienna (BOKU), Muthgasse 18, 1180 Vienna, Austria
| | - Radka Kodešová
- Faculty
of Agrobiology, Food and Natural Resources, Dept. of Soil Science
and Soil Protection, Czech University of
Life Sciences Prague, Kamýcká 129, CZ-16500 Prague 6, Czech Republic
| | - Helena Švecová
- Faculty
of Fisheries and Protection of Waters, South Bohemian Research Center
of Aquaculture and Biodiversity of Hydrocenoses, University of South Bohemia in České Budějovice, Zátiší 728/II, CZ-38925 Vodňany, Czech Republic
| | - Miroslav Fér
- Faculty
of Agrobiology, Food and Natural Resources, Dept. of Soil Science
and Soil Protection, Czech University of
Life Sciences Prague, Kamýcká 129, CZ-16500 Prague 6, Czech Republic
| | - Antonín Nikodem
- Faculty
of Agrobiology, Food and Natural Resources, Dept. of Soil Science
and Soil Protection, Czech University of
Life Sciences Prague, Kamýcká 129, CZ-16500 Prague 6, Czech Republic
| | - Aleš Klement
- Faculty
of Agrobiology, Food and Natural Resources, Dept. of Soil Science
and Soil Protection, Czech University of
Life Sciences Prague, Kamýcká 129, CZ-16500 Prague 6, Czech Republic
| | - Roman Grabic
- Faculty
of Fisheries and Protection of Waters, South Bohemian Research Center
of Aquaculture and Biodiversity of Hydrocenoses, University of South Bohemia in České Budějovice, Zátiší 728/II, CZ-38925 Vodňany, Czech Republic
| | - Jiří Šimůnek
- Department
of Environmental Sciences, University of
California, Riverside, California 92521, United States
| |
Collapse
|
10
|
Sahai N, Gogoi M, Tewari RP. 3D Printed Chitosan Composite Scaffold for Chondrocytes Differentiation. Curr Med Imaging 2020; 17:832-842. [PMID: 33334294 DOI: 10.2174/1573405616666201217112939] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Revised: 09/18/2020] [Accepted: 09/30/2020] [Indexed: 01/26/2023]
Abstract
AIMS Our aim is to develop 3D printed chitosan-gelatin-alginate scaffolds using a costeffective in house designed 3D printer followed by its characterization. To observe chondrocyte differentiation on 3D printed scaffolds as part of scaffold application. BACKGROUND Cartilage is considered to be a significant tissue in humans. It is present in between the rib cage, the lobe of the ear, nasal septum in the form of hyaline cartilage, in between ribs costal cartilage, intervertebral discs in the form of fibrocartilage, meniscus, larynx, epiglottis and between various joints of bones. To replace or repair damaged tissues due to disorders or trauma, thousands of surgical procedures are performed daily. 3D printing plays a crucial role in the development of controlled porous architectures of scaffolds for cartilage tissue regeneration. Advancement in 3D printing technology like inkjet, micro- extrusion in 3D bioprinting, Laser-assisted 3D Bioprinting (LAB), stereolithography combination with biomaterials plays a crucial role in the quick development of patient-specific articulating cartilage when need in a short period frame. OBJECTIVE Our objective is to develop different compositions of chitosan-gelatin-alginate composite hydrogel scaffolds with controlled porosity and architectures with the application of 3D printing and observe the growth of cartilage on it. To achieve as proposed, an in-house 3D paste extruder printer was developed, which is capable of printing porous composite chitosan hydrogel scaffolds of desired architecture layer by layer. After the characterization of 3D printed chitosan composite scaffolds, the differentiation of chondrocyte was observed using hMSC. METHODS In present paper process for the development of chitosan-alginate-gelatin composite hydrogel, 3D printing, morphological characterization, and observation for differentiation of chondrocytes cells on 3D printed chitosan composite hydrogels is presented. The present study is divided into three parts: in first part development of composite chitosan-alginate-gelatin hydrogel with the utilization of in house customized assembled paste extruder based 3D printer, which is capable of printing chitosan composite hydrogels. In the second part, the characterization of 3D printed chitosan composite scaffolds hydrogel is performed for evaluating the morphological, mechanical, and physical properties. The prepared composite scaffolds were characterized by Fourier Transform Infrared Spectroscopy (FTIR), X-Ray Diffraction(XRD), Scanning Electron Microscopy SEM, swelling property, mechanical testing, porosity, etc. In the last part of the study, the differentiation of chondrocytes cells was observed with human Mesenchymal Stem Cells (hMSC) on 3D printed scaffolds and showed positive results for the same. RESULTS Stereolithography (STL) files of 3D models for porous chitosan composite were developed using Computer-Aided Design (CAD) and printed with a hydrogel flow rate within the range of 0.2-0.25 ml/min. The prepared scaffolds are highly porous, having optimum porosity, optimal mechanical strength to sustain the cartilage formation. The 3D printed chitosan composite scaffolds show supports for the differentiation of chondrocytes. The above study is helpful for in-vivo regeneration of cartilage for patients having related cartilage disorders. CONCLUSION This method helps in regeneration of degenerated cartilage for patient-specific and form above experiment we also concluded that 3D printed chitosan scaffold is best suited for the regeneration of chondrocyte cells.
Collapse
Affiliation(s)
- Nitin Sahai
- Department of Biomedical Engineering, North-Eastern Hill University, Shillong-793022, Meghalaya, India
| | - Manashjit Gogoi
- Department of Biomedical Engineering, North-Eastern Hill University, Shillong-793022, Meghalaya, India
| | - Ravi Prakash Tewari
- Department of Applied Mechanics, Motilal Nehru National Institute of Technology, Allahabad, Prayagraj-211004, Uttar Pradesh, India
| |
Collapse
|
11
|
Sparrenberg LT, Greiner B, Mathis HP. Bleaching correction for DNA measurements in highly diluted solutions using confocal microscopy. PLoS One 2020; 15:e0231918. [PMID: 32702012 PMCID: PMC7377397 DOI: 10.1371/journal.pone.0231918] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Accepted: 07/01/2020] [Indexed: 11/24/2022] Open
Abstract
Determining the concentration of nucleic acids in biological samples precisely and reliably still is a challenge. In particular when only very small sample quantities are available for analysis, the established fluorescence-based methods give insufficient results. Photobleaching is seen as the main reason for this. In this paper we present a method to correct for the photobleaching effect. Using confocal microscopy with single molecule sensitivity, we derived calibration curves from DNA solutions with defined fragment length. We analyzed dilution series over a wide range of concentrations (1 pg/μl—1000 pg/μl) and measured their specific diffusion coefficients employing fluorescence correlation spectroscopy. Using this information, we corrected the measured fluorescence intensity of the calibration solutions for photobleaching effects. We evaluated our method by analyzing a series of DNA mixtures of varying composition. For fragments smaller than 1000 bp, our method allows to determine sample concentrations with high precision in very small sample quantities (< 2 μl with concentrations < 20 pg/μl). Once the technical parameters are determined and remain stable in an established process, our improved calibration method will make measuring molecular biological samples of unknown sequence composition more efficient, accurate and sample-saving than previous methods.
Collapse
Affiliation(s)
- Lorenz Tim Sparrenberg
- Institute of Biotechnology, RWTH Aachen University, Aachen, Germany
- Fraunhofer Institute of Applied Information Technology FIT, Sankt Augustin, Germany
- * E-mail:
| | - Benjamin Greiner
- Fraunhofer Institute of Applied Information Technology FIT, Sankt Augustin, Germany
| | - Harald Peter Mathis
- Fraunhofer Institute of Applied Information Technology FIT, Sankt Augustin, Germany
| |
Collapse
|
12
|
Hossain MAM, Uddin SMK, Sultana S, Bonny SQ, Khan MF, Chowdhury ZZ, Johan MR, Ali ME. Heptaplex Polymerase Chain Reaction Assay for the Simultaneous Detection of Beef, Buffalo, Chicken, Cat, Dog, Pork, and Fish in Raw and Heat-Treated Food Products. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2019; 67:8268-8278. [PMID: 31283221 DOI: 10.1021/acs.jafc.9b02518] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Species authentication of meat and fish products is crucial to safeguard public health, economic investment, and religious sanctity. We developed a heptaplex polymerase chain reaction assay targeting short amplicon length (73-198 bp) for the simultaneous detection and differentiation of cow, buffalo, chicken, cat, dog, pig, and fish species in raw and processed food using species-specific primers targeting mitochondrial cytb, ND5, and 16s rRNA genes. Assay validation of adulterated and various heat-treated meatball matrices showed excellent stability and sensitivity under all processing conditions. The detection limit was 0.01-0.001 ng of DNA under pure states and 0.5% meat in meatball products. Buffalo was detected in 86.7% (13 out of 15) of tested commercial beef products, while chicken, pork, and fish products were found to be pure. The developed assay was efficient enough to detect target species simultaneously, even in highly degraded and processed food products at reduced time.
Collapse
|
13
|
Zhang C, Parrello D, Brown PJB, Wall JD, Hu Z. A novel whole-cell biosensor of Pseudomonas aeruginosa to monitor the expression of quorum sensing genes. Appl Microbiol Biotechnol 2018; 102:6023-6038. [PMID: 29730766 DOI: 10.1007/s00253-018-9044-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Revised: 04/19/2018] [Accepted: 04/19/2018] [Indexed: 01/01/2023]
Abstract
A novel whole-cell biosensor was developed to noninvasively and simultaneously monitor the in situ genetic activities of the four quorum sensing (QS) networks in Pseudomonas aeruginosa PAO1, including the las, rhl, pqs, and iqs systems. P. aeruginosa PAO1 is a model bacterium for studies of biofilm and pathogenesis while both processes are closely controlled by the QS systems. This biosensor worked well by selectively monitoring the expression of one representative gene from each network. In the biosensor, the promoter regions of lasI, rhlI, pqsA, and ambB (QS genes) controlled the fluorescent reporter genes of Turbo YFP, mTag BFP2, mNEON Green, and E2-Orange, respectively. The biosensor was successful in monitoring the impact of an important environmental factor, salt stress, on the genetic regulation of QS networks. High salt concentrations (≥ 20 g·L-1) significantly downregulated rhlI, pqsA, and ambB after the biosensor was incubated for 17 h to 18 h at 37 °C, resulting in slow bacterial growth.
Collapse
Affiliation(s)
- Chiqian Zhang
- Department of Civil & Environmental Engineering, University of Missouri, Columbia, MO, USA
| | - Damien Parrello
- Department of Civil & Environmental Engineering, University of Missouri, Columbia, MO, USA
| | - Pamela J B Brown
- Division of Biological Sciences, University of Missouri, Columbia, MO, USA
| | - Judy D Wall
- Department of Biochemistry, University of Missouri, Columbia, MO, USA
| | - Zhiqiang Hu
- Department of Civil & Environmental Engineering, University of Missouri, Columbia, MO, USA.
| |
Collapse
|
14
|
Abstract
Deciphering the folding pathways and predicting the structures of complex three-dimensional biomolecules is central to elucidating biological function. RNA is single-stranded, which gives it the freedom to fold into complex secondary and tertiary structures. These structures endow RNA with the ability to perform complex chemistries and functions ranging from enzymatic activity to gene regulation. Given that RNA is involved in many essential cellular processes, it is critical to understand how it folds and functions in vivo. Within the last few years, methods have been developed to probe RNA structures in vivo and genome-wide. These studies reveal that RNA often adopts very different structures in vivo and in vitro, and provide profound insights into RNA biology. Nonetheless, both in vitro and in vivo approaches have limitations: studies in the complex and uncontrolled cellular environment make it difficult to obtain insight into RNA folding pathways and thermodynamics, and studies in vitro often lack direct cellular relevance, leaving a gap in our knowledge of RNA folding in vivo. This gap is being bridged by biophysical and mechanistic studies of RNA structure and function under conditions that mimic the cellular environment. To date, most artificial cytoplasms have used various polymers as molecular crowding agents and a series of small molecules as cosolutes. Studies under such in vivo-like conditions are yielding fresh insights, such as cooperative folding of functional RNAs and increased activity of ribozymes. These observations are accounted for in part by molecular crowding effects and interactions with other molecules. In this review, we report milestones in RNA folding in vitro and in vivo and discuss ongoing experimental and computational efforts to bridge the gap between these two conditions in order to understand how RNA folds in the cell.
Collapse
|