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Safety
Overview
Safety has been attached great importance in every year’s project and experiment for HZAU-China, especially in 2021, still under the picture of pandemic.
We not only abide by the safety rules and policies provided by the iGEM authority strictly, but also take every possible safety problem of our project into our consideration. It’s necessary to think about each aspect and give corresponding solutions as pre-arranged planning to avoid uncertainty, because our product will be implied into the actual working condition. Furthermore, since we are still under the condition of implementing the regular epidemic prevention, more attention was paid to reduce the human contacts and keeping the laboratory hygienic.
Lab Safety
Our lab locates in the main hall of College of Life Science and Technology, Huazhong Agricultural University. The main hall has an access control system, which can identify the student’s ID and only allow authorized students to enter (Figure 1). The teacher taking the charge of safety management of our college had been providing safety training for each team members and have routinly safety inspection for our lab.
Figure 1. Our access control system of entrance guard.
Safety Education
Professor Yingchun Qi is responsible for the safety and security of our lab. She has
been working as the safety and security office in HuaZhong Agriculture University for
decades, and she also gives lectures about biological experiments in university.
Safety of experience
Our laboratory is equipped with the fume hood, medicine cabinet (Figure 2). In
addition, all the biological waste generated during the experiments is managed by
trained stuff. So all of this measures can ensure that we can do experiment in a safe
environment.
Figure 2. The safety of our laboratory. A. The overview of our
laboratory. B. Fume hood. C. Trash bin for biological waste.
D. Medicine cabinet.
All researchers wear gloves, masks, and lab coats (Figure 3 ). When handling
volatile or irritating items, the experimenter is required to wear goggles to ensure
safety. For using the instrument, the researchers strictly followed the instruction
protocol to operate.
In our project, we need to verity the function of antimicrobial peptide (AMP) such as
LL-37, which can neutralize lipopolysaccharide. So we used the Salmonella
typhimurium SL1344 from Jin He’s lab in Huazhong Agricultural University,
which has used in iGEM 2018 and sifA gene located in Salmonella pathogenicity
island was knocked out (https://2018.igem.org/Team:HZAU-China/Safety). When operating the
Salmonella typhimurium SL1344, the researcher was required to wear a mask,
goggles and laboratory clothes, and used 75% alcohol to disinfect before and after the
operation. Sterilize the operating platform with ultraviolet light after operation.
Moreover, we had submitted the Check-in-form and got a permission. None of this would
violate Chinese biosecurity policy.
Figure 3. A researcher operated with bacteria.
Safety of COVID- 19
Our project does not relate to COVID-19, and we did not use the RNA or
protein of SARS-CoV-2. However, because of the COVID-19 pandemic, our team is
taking a more cautious approach to offline human contact. All offline activities we hold
were under the premise of confirming the health of both parties, and with the consent of
the school and participants. We followed the epidemic prevention policy of the
Hongshan district government, and all the activities are carried out with
approval. During daily lab work and meetings, team members wear mask to minimize the
risk. In addition, the laboratory is equipped with disinfection items, and the
laboratory is cleaned and disinfected every day (Figure 4).
Figure 4. The disinfection items of our laboratory.
Safety of project
Safety is always the most important at every time. We not only about the safety of
laboratory, but also focused on the project. We submitted the safety form, which
including the detailed information about our project. the E.coli as our chassis
organisms, which only make people diarrhea. The E.coli DH5α, BL21(DE3)
were used to implement the experience of gene clone and expression. However, the above
strains are often used in the laboratory, not for daily product. On the other hand,
based on the result of questionnaire, we perceived that the safety of engineered
bacteria is concerned. More than 50% of people worry about its safety. The safety of the project is ensured through both biological and physical
methods. At the biological level, we design two suicide systems to ensure their safety,
while for the physical safety, we use sodium alginate to embed our engineered bacteria.
More details are shown below.
Safety in project design
At first, the chassis of our project is a widely recognized probiotic, E.coli
Nissle 1917, which pose no harm to human health or environmental. Then, considering the
implementation of our bacteria. We designed two different temperature-based suicide
schemes. In the first scheme, the expression of HepT would be inhibited by
heat-inhibition RNA thermometer in dogs’ guts, whereas it could be constantly expressed
in vitro and make the bacteria commit suicide. In another scheme, we imported the
HepT/MntA toxin-antitoxin system and kept HepT continually being generated. Instead of
controlling HepT directly, we applied heat-activation RNA thermometer to activate the
expression of MntA and neutralize HepT in intestine. Both schemes could perform the same
expected suicidal function even if we employed diverse RNA thermometers with opposite
effects. Furthermore, the specific suicidal scheme could be adjusted properly by
changing the selection of RNA thermometers to tackle different room temperatures in
different regions when it comes to practical application.
Safety of implementation
The microenvironment within the gel beads can provide protection and nutrition for
micro. So that using gel beads has become very attractive for applications of our
modified bacteria. We choose to embed engineered bacteria in sodium alginate, which can
act as a physics barrier to avoid the bacteria escaping to the outer environment.
Meanwhile, the bacteria have certain biological activity in the gel beads. Videlicet, we prevent bacteria from directly entering the environment
without losing their biological functions.
In Compliance With iGEM's Safety Policies
“Do not Release Policy” is the core rule of our laboratory. First, we did not
allow genetically modified organisms (GMO) to escape from our laboratory. At the same
time, we have not released any GMOs into the environment. Secondly, there was no gene
drive technology in our project. Furthermore, we did not implementation any animal
experiments or human experiments. Finally, under the guidance of “Antimicrobial
resistance policy”, we have not use any part containing sequences connected
resistance to antimicrobials on WHO's list.