Team:Brasil-SP

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<td colspan="3"><h1 align="center">Welcome to Brasil-SP team Wiki!</h1>
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<h1 >WELCOME TO iGEM 2014! </h1>
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<p>Your team has been approved and you are ready to start the iGEM season!
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<br>On this page you can document your project, introduce your team members, document your progress <br> and share your iGEM experience with the rest of the world! </p>
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<p style="color:#E7E7E7"> <a href="https://2014.igem.org/wiki/index.php?title=Team:Brasil-SP&action=edit"style="color:#FFFFFF"> Click here  to edit this page!</a> </p>
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<a href="https://2014.igem.org/Team:Brasil-SP"style="color:#000000">Home </a> </td>
 
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<a href="https://2014.igem.org/Team:Brasil-SP/Team"style="color:#000000"> Team </a> </td>
 
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<a href="https://igem.org/Team.cgi?year=2014&team_name=Brasil-SP"style="color:#000000"> Official Team Profile </a></td>
 
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<a href="https://2014.igem.org/Team:Brasil-SP/Project"style="color:#000000"> Project</a></td>
 
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<a href="https://2014.igem.org/Team:Brasil-SP/Modeling"style="color:#000000"> Modeling</a></td>
 
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<a href="https://2014.igem.org/Team:Brasil-SP/Attributions"style="color:#000000"> Attributions </a></td>
 
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<td align ="center"> <a href="https://2014.igem.org/Main_Page"> <img src="https://static.igem.org/mediawiki/igem.org/6/60/Igemlogo_300px.png" width="55px"></a> </td>
 
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<td colspan="3"><h3 align="center">Project Description</h3>
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<td colspan="3"><h2 align="left">Project Abstract</h2>
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<p><div align="justify">Our project consists of a biological molecular device (using <i>Bacillus subtilis</i> as chassis) for detection of Cystatin C, a biomarker of chronic kidney disease. The genetic circuit being assembled is based on the outstanding project of the Imperial College of London team of iGEM 2010 (special thanks to the ex-iGEMer Christopher Hirst, who helped us a lot sending some important BioBricks). Part of our mission is also to improve the characterization of the BioBricks developed on 2010 and to validate the molecular design as a generic detection system. This flexibility of detection is based on a protease cleavage of a membrane protein who triggers the genetic circuit. Since any cleavage site could be designed, virtually any protease could be used as a signal for the detection. In our case, the disease biomarker will inhibit the action of our chosen protease (Cathepsin S) and the detection will be made indirectly and negatively - <i>i.e.</i> by the Cathepsin lack of protease activity and absense of the system output. We are on the way to assemble all the parts and properly characterize each part of our construction on time for the Jamboree.<br> To address a real world situation, we are working on the same principle and aesthetics of the well known devices for biodetection like pregnancy or HIV tests: easy-to-use microfluidic devices. The plan is to design a microchip able to store spores of the developed strains of <i>B. subtilis</i> and safely expose blood samples to our biodetection system, successfully containing the biomaterial and enabling a proper discard of the chip. <i>A priori</i>, the device output monitoring would require a fluorescence detector tool, but we also propose a naked eye output observation as a concept for future prospects.<br> Since we are working on a solution for a problem directly related to ordinary people, having a public feedback about synthetic biology is very important to analyze the social impact of our work and it help us to evaluate the biosafety and bioethical issues beyond a simple risk analysis - a sociological characterization of the values of our project. Thus, as a policy and practices approach, we will try to report public opinion of Brazil on these issues using a questionnaire to evaluate our actual scenario and, in a certain way, our own project.</div></p>
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<td colspan="3"><h3 align="center">Wiki Pre Structure (Under Construction!)</h3>
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<td colspan="3"><h3 align="left">English: Kidney sensing – toward a bacterial biosensor engineered for early stages chronic kidney disease</h3>
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<p>This is the initial wiki pre structure that might be changed over its development. <b>Everything here is merely provisional!</b></p>
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<p><div align="justify">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Chronic Kidney Disease (CKD), which is characterized by alterations in kidney functions and structure, affects millions of people worldwide and a large portion of them is unaware of it. Absence of symptoms in early stages leads to a late diagnosis when patients need dialysis or even transplants. Currently, CKD is diagnosed by measuring creatinine levels in blood, which in turn are detectable only at late stages of renal dysfunction as well as are sensitive to factors such as diet, gender, ethnicity, age, muscle mass. We report the development of a biosensor that can diagnosis CKD in its early stages, identifying a biomarker named Cystatin C.
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Using a cell surface biosensor as detector and quorum-sensing system as transducer and response mechanism, we developed a genetic circuit that establishes a threshold, differentiating concentration ranges of Cystatin C. We envisioned it as a fast, simple and reliable tool for CKD screening and diagnosis.
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<li><a href="https://2014.igem.org/Team:Brasil-SP">Home</a> </li>
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<li><a href="https://2014.igem.org/Team:Brasil-SP/TheIssue">The Issue</a>
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    <li><a href="https://2014.igem.org/Team:Brasil-SP/TheIssue">Overview</a> </li>
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    <li><a href="https://2014.igem.org/Team:Brasil-SP/TheIssue/AvaliableSolutions">Avaliable Solutions</a> </li>
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    <li><a href="https://2014.igem.org/Team:Brasil-SP/TheIssue/OurSolution">Our Solution</a> </li>
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<li><a href="https://2014.igem.org/Team:Brasil-SP/Project">The Project</a>
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    <li><a href="https://2014.igem.org/Team:Brasil-SP/Project">Overview</a> </li>
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    <li><a href="https://2014.igem.org/Team:Brasil-SP/Project/Cystatin">Cystatin C</a> </li>
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    <li><a href="https://2014.igem.org/Team:Brasil-SP/Project/DetectionModule">Detection Module</a> </li>
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    <li><a href="https://2014.igem.org/Team:Brasil-SP/Project/DiagnosisModule">Diagnosis Module</a> </li>
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    <li><a href="https://2014.igem.org/Team:Brasil-SP/Project/ResponseModule">Response Module</a> </li>
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    <li><a href="https://2014.igem.org/Team:Brasil-SP/Project/Device">The Device</a> </li>
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<li><a href="https://2014.igem.org/Team:Brasil-SP/Modeling">Modeling</a> (Question: how many pages we'll really need here!? Modelling guys must have the answer.)
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    <li><a href="https://2014.igem.org/Team:Brasil-SP/Modeling">Overview</a> </li>
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    <li><a href="">Detection Module</a> </li>
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    <li><a href="">Diagnosis Module</a> </li>
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<li><a href="https://2014.igem.org/Team:Brasil-SP/Results">Results</a>
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    <li><a href="https://2014.igem.org/Team:Brasil-SP/Results">Overview</a> </li>
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    <li><a href="https://2014.igem.org/Team:Brasil-SP/Results/Characterization">Characterization</a> </li>
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    <li><a href="https://2014.igem.org/Team:Brasil-SP/Results/Sporulation">Sporulation and Germination</a> </li>
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<td colspan="3"><h3 align="center">Sporulation and Germination</h3>
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<p><div align="justify">Bacillus subtilis is Gram-Positive bacteria, considered a model organism for, which has been studied in the last 50 years. Our intention here was to summarize the information we get so other teams can use our page as a basis to their work.
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Who is it?
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When we begin to outline our project, we first decided to use Escherichia coli as a chassis. However, looking at Bacillus subtilis more closely we concluded it would be a very better choice to what we aimed.
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More than a thousand years ago humans started working with B. subtilis. Japaneses discovered that fermented soybeans could be delicious at breakfast, and for centuries Bacillus subtilis has been used to produce natto1. Nowadays, Bacillus subtilis is also used as a biological factory, to produce enzymes and fine biochemicals. It’s also an interesting host for the heterologous protein production. This Gram +ve bacteria can produce and secrete large amounts of protein to the medium. In addition, the genre Bacillus is noticeable by his high capacity of adsorbing and uptaking exogenous DNA2. This is one of the main reasons why it has been extensively used in both applied and fundamental research in the past decades.
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As a model organism, there is available a lot of detailed data about it. Bacillus subtilis was the first Gram-positive bacteria to have its entire genome sequenced and annotated (strain 168)3. Following this project, all essential genes were indentified4. Currently, large-scale data such as transcriptome5, proteome6, secretome7 and metabolome8 are available.
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Furthermore, its use is promoted mainly due to the non-pathogenic nature of this organism. It has been awarded the GRAS (Generally Recognized as Safe) status by the US Food and Drug Administration - FDA. In the opposite, Bacillus subtilis is close enough to other clinically relevant Gram-positive pathogens to be used as an organism relevant to research new targets to antimicrobials and anti-infectives2.
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Well, Bacillus subtilis can easily uptake exogenous DNA, secrete a lot of proteins in the medium, has been used through centuries and is a safe chassis. Can it be better?
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Yes it can.
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We haven’t mentioned before what made us choice Bacillus subtilis as our favorite “pet”-chassis and why you should use it too: the endospores.
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Bacteria's life can be stressful and complex, needing to face a lot of adversities and we can use this in our favor. In this situation, like starvation, many bacteria trigger a cellular response involving many genes. In Bacillus subtilis this process entails the activity of more than 500 genes and take approximately ten hours.9
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In a sweetable growth medium, cells double in length and then divide centrally to produce two identical daughter cells. The sporulation process starts with an asymmetric division. The biggest cell (called mother) engulfs the smallest (called prespore). When this process is completed, the membrane which surrounds the cytoplasm of the prespore (now called the forespore) gets a very amorphous appearance, probably due to the absence of peptidioglycan layer to define the cell shape. Next, a modified form of cell wall, known as cortex, is synthesized between the prespore membranes, providing it with an oblong shape. Simultaneously, the proteinaceous spore coat begins to be deposited on the outside surface of the prespore. The lysis of a mother cell releases the mature spore. The spore is a resistant structure, conceived to resist to hazards like heat, radiation and toxic chemicals, remaining dormant until be exposed to mild conditions when it get germinated. As a commercial product, it’s perfect. The storage and the cells switch on is equally easy, bringing to open-and-shut product.10
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The primary question is: exposing our cells to a stressful medium will lead them all to form spores? Certainly no. Sporulation is the ultimate bacteria's decision. And when they finally decide to it, always there are some of them who betray the movement.
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Many of other strategies are tried before sporulation. Those include secretion of antibiotics and other chemical weapons to kill other microbes that are in the same niche; the activation of cellular motility by flagella to search for new nutrients source and the secretion of hydrolytic enzymes to remove extracellular polysacharides and proteins. Furthermore, before sporulation starts the cells check chromosome integrity and the state of chromosomal replication, so if the process begins the bacterium is sure that it will be finished.9
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Once situation is extreme, cells must choice between three ways: sporulation, competence or cannibalism. Most cells make the commitment to sporulation. However, the genetic material realized by cell lysis isn’t wasted by the colony. Some cells opt for a different state of competence, triggered by ComK exceeding a certain threshold level. If a cell chose this way, it can uptake exogenous DNA resulting from lysis and use it to repair his own DNA or sometimes new genetic information. In the case of Bacillus subtilis approximately 10% of cells choose this path and after approximately 20 h they switch back to the vegetative state. In On the other hand, it has been showed that some bacteria further along to sporulation produce and secrete antibacterial factors that block sibling cells from sporulating. This makes them to lysis. Such cannibalistic cells feed on the nutrients released by the lysed cells. So, in the end, they prevent their own progression toward sporulation by satiating their feeding needs.9
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But it's even more important to understand how spore's germination occur. In our device, we provide nutrients to the bacteria. Those nutrients act as germinants. The spores can recognize them receptor proteins encoded by the gerA family of operons, which includes gerA, gerB and gerK. We can induce germination providing alanine (Ala) or a mixture of asparagine, glucose, fructose and potassium ions (AGFK) for example. The first one activate the alanine receptor GerA and the second the asparagine receptor GerB. The interaction between nutrient germinants and receptors triggers the replace of spore core's huge depot of dipicolinic acid and cations by water. This effect triggers the hydrolysis of the spore's peptidoglycan cortex by one of two redundant enzymes. The completion of cortex hydrolysis and subsequent germ cell wall expansion allows spore core hydration. This results in resumption of spore metabolism and macromolecular synthesis.11 Understanding this process we can chose when and how our product will start working.
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What we did
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Here you can see all our microbiology protocols. Feel free to use all of them. We acknowledge to LMU-Munich team 2012 for… (hyperlink para: https://2012.igem.org/Team:LMU-Munich ). We based our protocols on their work.
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In this project, it was used the 168 strain (TROCAR PELA LINHAGEM QUE USAREMOS)
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First step was to grow our chassis. Bacillus subtilis grows quickly at Luria-Bertani medium (agar or broth) and it was used to propagate our cultures.
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FOTO PLACA DE PETRI COM BACILLUS FORRADA APÓS 24 HORAS
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Next, sporulation was induced through  extensive culture (18 h) in DSM medium (incluir Fórmula). Then, it was used a proper Spore Count Protocol, resulting in the graphic below:
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GRÁFICO A SER CONSTRUÍDO MOSTRANDO ESPORULAÇÃO
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TABELA COM OS DADOS DO GRÁFICO, SE NECESSÁRIO
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FOTO DOS ESPOROS OBSERVADOS AO MICROSCÓPIO
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We could achieve a high sporulation level (XX%). This is very important from industrial outlook. However, it’s important to know spores viability. To induce germination, it was used Luria-Bertani broth. As a rich medium, it induces the receptors before mentioned. The following graphic shows the efficiency of our method:
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GRÁFICO A SER CONTRSUÍDO MOSTRANDO ATIVAÇÃO
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FOTO DO BACILLUS APÓS TESTE DE GRAM EM DIFERENTES ZOOMS
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Our work showed the efficiency of both sporulation and germination. This is very important from industrial view. Once our circuit is finished, it will be simple and cheap to grow Bacillus subtilis cells and to sporulate them. Understanding both processes in theory and practice, we can achieve a high efficiency approaches, which could bring our device to market.
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1. SCHALLMEY, M. et al Developments in the use of Bacillus species for industrial production. Canadian Journal of Microbiology, 2004, 50(1): 1-17.
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2. ZWEERS, J. C. et al Towards the development of Bacillus subtilis as a cell factory for membrane proteins and protein complexes. Microbial Cell Factories, 2008, 7:10.
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The electronic version of this article is the complete one and can be found online at: http://www.microbialcellfactories.com/content/7/1/10 . Acess: 09/13/2014
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3. KUNST, F. et al The complete genome sequence of the gram-positive bacterium Bacillus subtilis. Nature, 1997, 390:249-256.
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4. KOBAYASHI, K. et al Essential Bacillus subtilis genes. Proc Natl Acad Sci U S A, 2003, 100:4678-4683.
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5. SIERRO, N. et al DBTBS: a database of transcriptional regulation in Bacillus subtilis containing upstream intergenic conservation information. Nucleic Acids Res, 2007.
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6. WOLFF, S. et al Towards the entire proteome of the model bacterium Bacillus subtilis by gel-based and gel-free approaches. J Chromatogr B Analyt Technol Biomed Life Sci, 2007, 849:129-140.
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7. TJALSMA, H. Proteomics of protein secretion by Bacillus subtilis: separating the "secrets" of the secretome. Microbiol Mol Biol Rev, 2004, 68:207-233.
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8. FISCHER, E., SAUER, U. Large-scale in vivo flux analysis shows rigidity and suboptimal performance of Bacillus subtilis metabolism. Nat Genet, 2005, 37:636-640.
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9. SCHULTZ, D. et al Deciding fate in adverse times: Sporulation and competence in Bacillus subtilis. PNAS, December 15, 2009. 106.
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10. ERRINGTON, J. Bacillus subtilis Sporulation: Regulation of Gene Expression and Control of Morphogenesist. Microbiological Reviews, Mar. 1993, 57: 1-33
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11. SETLOW, P. Spore germination. Current Opinion in Microbiology, December 2003, 6: 550-556.
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    <li><a href="https://2014.igem.org/Team:Brasil-SP/Results/Microfluidics">Microfluidic Device</a> </li>
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<td colspan="3"><h3 align="left">Português: Kidney sensing – Desenvolvendo um biossensor bacteriano para diagnóstico de estágios iniciais da doença renal crônica</h3>
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<p><div align="justify">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A Doença Renal Crônica (DRC), caracterizada por alterações nas funções e na estrutura dos rins, afeta milhões de pessoas no mundo todo e grande porção delas não tem consciência disso. A ausência de sintomas em estágios iniciais leva a um diagnóstico tardio, quando os pacientes já necessitam de diálise ou até mesmo de transplantes. Atualmente, a DRC é diagnosticada através da quantificação de creatinina no sangue, que por sua vez é alterada a proporções detectáveis somente nos estágios mais avançados da disfunção renal, como também é sensível a fatores como: dieta, gênero, etnia, idade e massa muscular. Reportamos aqui o desenvolvimento de um biossensor que pode diagnosticar DRC em seus estágios iniciais, identificando um biomarcador chamado Cistatina C.
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Usando a membrana celular como detector e um sistema de quorum sensing como mecanismo de transdução e de resposta, desenvolvemos um circuito gênico que estabelece uma barreira e diferencia faixas de concentração de Cistatina C. Nós o idealizamos como uma ferramenta rápida, simples e confiável para o diagnóstico de DRC. (Translated by <a href="https://2014.igem.org/Team:Brasil-SP" >Brasil-SP Team</a>)
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<li><a href="https://2014.igem.org/Team:Brasil-SP/Outreach">Outreach</a> (The "Human Practices" part)
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    <li><a href="https://2014.igem.org/Team:Brasil-SP/Outreach">Overview</a> </li>
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    <li><a href="https://2014.igem.org/Team:Brasil-SP/Outreach/BioEtics">Public Opinion on SynBio</a> </li>
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    <li><a href="https://2014.igem.org/Team:Brasil-SP/Outreach/WorkingTogether">Working Together</a> </li>
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<li><a href="https://2014.igem.org/Team:Brasil-SP/Team">Team</a>
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<p><div align="justify">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;L’insuffisance rénale chronique (CDK) est caractérisée par une altération de la fonction et de la structure du rein. Elle atteint des millions de personnes  à travers le monde mais un grand nombre d’entre elles ignorent qu’elles en sont atteintes. L’absence de symptômes au cours des stades précoces retarde le diagnostique et les patients ont d’ores et déjà besoin de dialyse ou même d’une transplantation. Actuellement, le diagnostique repose sur le dosage sanguin de la créatinine qui n'est détectable qu'au stade de dysfonction rénale et est influencé par différents facteurs tels que le jeûne, le genre, l’origine ethnique, l’âge et la masse musculaire. Nous avons développé un biosenseur capable de détecter cette maladie à des stades précoces grâce à l’identification d’un biomarqueur appelé Cystatin C. En ajoutant un biosenseur à la surface des cellules comme détecteur et un système de quorum-sensing comme mécanisme de transduction et de réponse, nous avons développé un circuit génétique à seuil permettant la détection de différentes gammes de concentrations en Cystatin C. Nous pensons que cet outil permet un dépistage et un diagnostique de l’insuffisance rénale rapide, simple et fiable. (Translated by <a href="https://2014.igem.org/Team:Paris_Saclay"> Paris_Saclay team</a>)</div></p>
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<li><a href="https://2014.igem.org/Team:Brasil-SP">Home</a> </li>
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<li><a href="https://2014.igem.org/Team:Brasil-SP/Team">Team</a> </li>
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<li><a href="https://igem.org/Team.cgi?year=2013&team_name=Brasil-SP">Official Team Profile</a> </li>
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<li><a href="https://2014.igem.org/Team:Brasil-SP/Project">Project</a> </li>
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<p>Visit the <a href="https://2014.igem.org/Wiki_How-To"> Wiki How To page </a> for a complete list of requirements, tips and other useful information. </p>
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<td colspan="3"><h3 align="left">Néerlandais: Nier sensing – Naar een bacteriële biosensor ontwikkeld voor het opsporen van vroege stadia van nieraandoeningen</h3>
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<p>We are currently working on providing teams with some easy to use design templates.
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<p><div align="justify">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Chronisch nierfalen, gekenmerkt door veranderingen in functie  en structuur van de nier, treft miljoenen mensen wereldwijd en de meesten van hen zijn zich er niet van bewust. Een gebrek aan symptomen in vroege stadia van de ziekte leidt tot late diagnose wanneer patienten al dialyse of zelfs transplantatie nodig hebben. Momenteel wordt chronisch nierfalen gediagnostiseerd door het creatine niveau in het bloed te meten wat alleen meetbaar is in late stadia van nierfalen en gevoelig is voor factoren als dieet, geslacht, herkomst, leeftijd en spiermassa. We bespreken de ontwikkeling van een biosensor die nierfalen in vroege stadia kan diagnostiseren door de biomarker Cytostatin C te identiceren. Met een biosensor aan het oppervlak van de cel als detector en een quorum-sensing system als transductie en reactive mechanism hebben wij een genetisch circuit ontwikkeld dat een drempelwaarde vast kan stellen om te discrimineren tussen concentraties van Cytostatine C. Wij voorzien dat een snel, simpel en betrouwbaar gereedschap wordt voor screening en diagnose van nierfalen. (Translated by <a href="https://2014.igem.org/Team:Groningen"> Groningen team</a>)</div></p>
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<li> <a href="https://2013.igem.org/Team:SDU-Denmark/"> 2013 SDU Denmark </a> </li>
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<li> <a href="https://2013.igem.org/Team:Shenzhen_BGIC_ATCG"> 2013 Shenxhen BGIG ATCG </a></li>
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<li> <a href="https://2013.igem.org/Team:Colombia_Uniandes">2013 Colombia Unianades </a></li>
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<p><div align="justify"><b>* The abstracts above were translated in several languages in collaboration with the Paris_Saclay and Groningen teams. The main objective is to divulge the iGEM projects to the greatest number of people as possible. </b></div></p>
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<li>Start documenting your project as early as possible; don’t leave anything to the last minute before the Wiki Freeze. For a complete list of deadlines visit the <a href="">iGEM 2013 calendar</a> </li>
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Latest revision as of 20:51, 17 October 2014

Capa.png

Welcome to Brasil-SP team Wiki!

Project Abstract

English: Kidney sensing – toward a bacterial biosensor engineered for early stages chronic kidney disease

     Chronic Kidney Disease (CKD), which is characterized by alterations in kidney functions and structure, affects millions of people worldwide and a large portion of them is unaware of it. Absence of symptoms in early stages leads to a late diagnosis when patients need dialysis or even transplants. Currently, CKD is diagnosed by measuring creatinine levels in blood, which in turn are detectable only at late stages of renal dysfunction as well as are sensitive to factors such as diet, gender, ethnicity, age, muscle mass. We report the development of a biosensor that can diagnosis CKD in its early stages, identifying a biomarker named Cystatin C. Using a cell surface biosensor as detector and quorum-sensing system as transducer and response mechanism, we developed a genetic circuit that establishes a threshold, differentiating concentration ranges of Cystatin C. We envisioned it as a fast, simple and reliable tool for CKD screening and diagnosis.

Português: Kidney sensing – Desenvolvendo um biossensor bacteriano para diagnóstico de estágios iniciais da doença renal crônica

     A Doença Renal Crônica (DRC), caracterizada por alterações nas funções e na estrutura dos rins, afeta milhões de pessoas no mundo todo e grande porção delas não tem consciência disso. A ausência de sintomas em estágios iniciais leva a um diagnóstico tardio, quando os pacientes já necessitam de diálise ou até mesmo de transplantes. Atualmente, a DRC é diagnosticada através da quantificação de creatinina no sangue, que por sua vez é alterada a proporções detectáveis somente nos estágios mais avançados da disfunção renal, como também é sensível a fatores como: dieta, gênero, etnia, idade e massa muscular. Reportamos aqui o desenvolvimento de um biossensor que pode diagnosticar DRC em seus estágios iniciais, identificando um biomarcador chamado Cistatina C. Usando a membrana celular como detector e um sistema de quorum sensing como mecanismo de transdução e de resposta, desenvolvemos um circuito gênico que estabelece uma barreira e diferencia faixas de concentração de Cistatina C. Nós o idealizamos como uma ferramenta rápida, simples e confiável para o diagnóstico de DRC. (Translated by Brasil-SP Team)

Français

     L’insuffisance rénale chronique (CDK) est caractérisée par une altération de la fonction et de la structure du rein. Elle atteint des millions de personnes à travers le monde mais un grand nombre d’entre elles ignorent qu’elles en sont atteintes. L’absence de symptômes au cours des stades précoces retarde le diagnostique et les patients ont d’ores et déjà besoin de dialyse ou même d’une transplantation. Actuellement, le diagnostique repose sur le dosage sanguin de la créatinine qui n'est détectable qu'au stade de dysfonction rénale et est influencé par différents facteurs tels que le jeûne, le genre, l’origine ethnique, l’âge et la masse musculaire. Nous avons développé un biosenseur capable de détecter cette maladie à des stades précoces grâce à l’identification d’un biomarqueur appelé Cystatin C. En ajoutant un biosenseur à la surface des cellules comme détecteur et un système de quorum-sensing comme mécanisme de transduction et de réponse, nous avons développé un circuit génétique à seuil permettant la détection de différentes gammes de concentrations en Cystatin C. Nous pensons que cet outil permet un dépistage et un diagnostique de l’insuffisance rénale rapide, simple et fiable. (Translated by Paris_Saclay team)

Néerlandais: Nier sensing – Naar een bacteriële biosensor ontwikkeld voor het opsporen van vroege stadia van nieraandoeningen

     Chronisch nierfalen, gekenmerkt door veranderingen in functie en structuur van de nier, treft miljoenen mensen wereldwijd en de meesten van hen zijn zich er niet van bewust. Een gebrek aan symptomen in vroege stadia van de ziekte leidt tot late diagnose wanneer patienten al dialyse of zelfs transplantatie nodig hebben. Momenteel wordt chronisch nierfalen gediagnostiseerd door het creatine niveau in het bloed te meten wat alleen meetbaar is in late stadia van nierfalen en gevoelig is voor factoren als dieet, geslacht, herkomst, leeftijd en spiermassa. We bespreken de ontwikkeling van een biosensor die nierfalen in vroege stadia kan diagnostiseren door de biomarker Cytostatin C te identiceren. Met een biosensor aan het oppervlak van de cel als detector en een quorum-sensing system als transductie en reactive mechanism hebben wij een genetisch circuit ontwikkeld dat een drempelwaarde vast kan stellen om te discrimineren tussen concentraties van Cytostatine C. Wij voorzien dat een snel, simpel en betrouwbaar gereedschap wordt voor screening en diagnose van nierfalen. (Translated by Groningen team)

* The abstracts above were translated in several languages in collaboration with the Paris_Saclay and Groningen teams. The main objective is to divulge the iGEM projects to the greatest number of people as possible.