Team:HZAU-China

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<p style="font-size:16px;font-family:arial, sans-serif;">Rabies is a zoonotic diseases of humans and animals. The rabies virus is transmitted through exposure to the infected saliva during either a bite or direct contact with mucosal tissues. Once identified, the mortality rate is almost 100%. Rabies is widely distributed around the world. Over 55000 people die of rabies per year and about 95% of human deaths occur in Asia and Africa[1]. Dogs are the main carriers of rabies and are responsible for most of the human rabies deaths in China[2]. Once the density of dogs reaches 4.5 per km2, the rabies will spread quickly in population [3]. The density of dogs is about 8-20/km2 in China[2], which is much higher than the minimum threshold. Several ways can be used to control rabies epidemics and the most efficient way is to focus on the mass vaccination for dogs[4]. In order to control canine rabies, the vaccination coverage should be over 70% according to the WHO assessment[2]. In China, however, tremendous improvement is needed to reach such a level since the vaccination coverage is low than 3% in the rural areas of China and almost zero for stray dogs[5,6]. This is mainly because of unawareness of rabies and the great cost of vaccination. In sum, it is a big challenge to control and prevent canine rabies in China because of the rapid spread of endemic rabies among the huge numbers of stray dogs that are very hard to register and regulate.</p>
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<p style="font-size:16px;font-family:arial, sans-serif;">For this reason, our team has designed a cheap and convenient way to increase the vaccination coverage of dogs by synthetic biology. It is called “safe moving vaccine factory” that can spread Rabies vaccine in the stray dogs rapidly and actively. We hope our design can help in reaching the WHO goal of being free of human rabies by 2020.</p>
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<p style="font-size:16px;font-family:arial, sans-serif;">Our idea comes from Yersinia pestis and fleas. Blocked flea can transfer Yersinia pestis to mammalian host and the mechanism has been widely researched. Yersinia pests can build biofilm in the proventricular, which will separate the oesophagus from midgut or stomach, resulting in blockage of fleas. Blocked fleas try to feed repeatedly, causing Yersinia pestis to be regurgitated into blood and thus successfully transferring the bacteria to mammalian host[7,8,9,10]. In our iGEM project, we make use of this interesting mechanism. Bacillus subtilis have already been widely used as vaccine vectors in health and medicine[11]. We chose B. subtilis as our vaccine vector to express the antigen of Rabies. Five proteins are present in rabies virus particles: nucleoprotein, phosphoprotein, matrixprotein, glycoproteinand RNA-dependent RNA polymerase. Because of containing the neutralizing epitopes which are the targets of vaccine-induced immunity, the glycoprotein can stimulate the organism to produce antibody against Rabies[12,13,14]. So once a flea carried our modified B. subtilis which can express glycoprotein to induce immunity of stray dogs, it can be seen as a moving vaccine factory. Taking the safety questionof flea into consideration, our flea will be safe enough through the endogenous or exogenous expression of “Antimicrobial Peptides” by B. subtilis[11], which can make sure our flea is free of Yersinia pestis. So it is a safe moving vaccine factory.   
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          <p><span style="float:right;font-size:26.4px;font-family:Impact;color:#000000;line-height: 1.3em;">PROJECT: Safe Moving Vaccine Factory</span></p>
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          <p><span style="float:right;font-size:26.4px;font-family:Impact;color:#ffd017;line-height: 1.3em;">ABSTRACT</span></p>
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          <p style="font-family:times new roman;">Our idea comes from <i>Yersinia pestis</i> and fleas. We make use of fleas as our moving injector. When fleas feed on blood from dogs, our vaccine vector <i>Bacillus subtilis</i> will be regurgitated into blood and successfully transferred to mammalian host. <i>Bacillus subtilis</i> can express antigens which can stimulate the immunity of dogs. Meanwhile, endogenous or exogenous expression of "Antimicrobial Peptides" by <i>B. subtilis</i> can kill <i>Yersinia pestis</i> in fleas. In this way we achieved a safe moving vaccine factory.</p>
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      <p style="font-family:Arial,Helvetica,sans-serif;font-size:30px;font-color:#fff;text-align:center; padding:20px;margin:0px;"><a href="https://2013.igem.org/Team:HZAU-China/Project">Overview of our project </a></p>
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        <p  style="font-family:Arial,Helvetica,sans-serif;font-size:17px;font-color:#000;text-align:justify; padding:10px;margin:0px;">55000 people die of rabies per year and about 95% of human deaths occur in Asia and Africa. We hope our project can help in reaching the WHO goal of being free of human rabies by 2020. This section shows the core consideration of our project.
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        <p  style="font-family:Arial,Helvetica,sans-serif;font-size:17px;font-color:#000;text-align:justify;padding:10px; margin:0px;">Yersinia pestis can form biofilms to colonize the proventricular of flea. Blocked fleas can transfer Yersinia pestis to host. The mechanism has been widely researched. Although it is too early for us to release clean fleas, we do spend a lot of time in thinking of this mechanism. You can find the details of this interesting mechanism in this section.</p>
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      <p  style="font-family:Arial,Helvetica,sans-serif;font-size:30px;font-color:#fff;text-align:center;padding:20px; margin:0px;"><a href="https://2013.igem.org/Team:HZAU-China/Modeling/Cellular_automata">Cellular automaton</a></p>
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        <p  style="font-family:Arial,Helvetica,sans-serif;font-size:17px;font-color:#000;text-align:justify;padding:10px; margin:0px;">In order to know whether safe moving vaccine factory can reach 70% vaccination coverage of dogs, Cellular automaton model has been used to simulate the spread of immunity.</p>
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      <p  style="font-family:Arial,Helvetica,sans-serif;font-size:30px;font-color:#fff;text-align:center;padding:20px; margin:0px;"><a href="https://2013.igem.org/Team:HZAU-China/Achievement/judgement">Judging form </a></p>
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        <p  style="font-family:Arial,Helvetica,sans-serif;font-size:17px;font-color:#000;text-align:justify;padding:10px; margin:0px;">This year is the first time we attend iGEM. And we applied to attend this competition on April 27,2013. It must be a big challenge for anyone to finish iGEM in just six months. We finished this hard work with trial and error. From our judging form, you can know what we have done in six months.</p>
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      <p  style="font-family:Arial,Helvetica,sans-serif;font-size:30px;font-color:#fff;text-align:center;padding:20px; padding-left:22px;padding-right:22px;margin:0px;"><a href="https://2013.igem.org/Team:HZAU-China/Collaboration">Helpful Ideas</a></p>
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        <p  style="font-family:Arial,Helvetica,sans-serif;font-size:17px;font-color:#000;text-align:justify;padding:10px; margin:0px;">We are iGEMers this year! It is a big challenge for us to finish the assessment of safety at the beginning of our work. We think every new iGEMer will face this kind of challenge. So we made suggestions on safety assessment for your new iGEMer guys! We hope these helpful ideas can provide some useful information for safety assessment. </p>
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Latest revision as of 11:22, 9 November 2013

图片轮播，选项卡，图片幻灯片效果

PROJECT: Safe Moving Vaccine Factory

ABSTRACT

Our idea comes from Yersinia pestis and fleas. We make use of fleas as our moving injector. When fleas feed on blood from dogs, our vaccine vector Bacillus subtilis will be regurgitated into blood and successfully transferred to mammalian host. Bacillus subtilis can express antigens which can stimulate the immunity of dogs. Meanwhile, endogenous or exogenous expression of "Antimicrobial Peptides" by B. subtilis can kill Yersinia pestis in fleas. In this way we achieved a safe moving vaccine factory.


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