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Stanford bioengineers introduce 'Bi-Fi'

Bioengineer by Bioengineer
August 31, 2013
in NEWS
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The technology uses an innocuous virus called M13 to increase the complexity and amount of information that can be sent from cell to cell. The researchers say the Bi-Fi could help bioengineers create complex, multicellular communities that work together to carry out important biological functions. Cells naturally use chemicals to communicate with the chemical signals typically acting as both the message and the messenger. However, this method of communication is extremely limited in terms of complexity and bandwidth. “If your network connection is based on sugar then your messages are limited to ‘more sugar,’ ‘less sugar,’ or ‘no sugar’” explains Drew Endy, PhD, an assistant professor of bioengineering. By separating the messenger and the message, Endy and Monica Ortiz, a doctoral candidate in bioengineering, have been able to greatly increase the amount of data that can be transmitted.

Monica Ortiz, PhD candidate, bioengineering. Photo: Norbert von der Groeben
Monica Ortiz, PhD candidate, bioengineering. Photo: Norbert von der Groeben

They chose the virus M13 to act as the messenger because when it infects bacteria, it doesn’t kill its host but makes itself at home indiscriminately sending out DNA strands that it reproduces within its host. The engineers are able to control these strands of DNA, so custom DNA messages can be wrapped within proteins produced by M13 and sent out to infect other cells. Once they arrive in a new host, they release the packaged DNA message.

 The researchers liken their M13-based system to a wireless internet connection that allows cells to send and receive messages but doesn’t care about the content of the messages. “Effectively, we’ve separated the message from the channel. We can now send any DNA message we want to specific cells within a complex microbial community,” said Ortiz. Using DNA to store the message means that it can contain any sort of genetic instruction. M13 is known to have packaged DNA strands containing as many as 40,000 base pairs, which is far in excess of the majority of genetic messages of interest in bioengineering that range from several hundred to many thousand base pairs. Ortiz has also used M13 to broadcast genetic messages between cells that are separated by over seven centimeters (2.7 in) of a gelatinous medium, which she says is considered a very long-range, cellularly speaking.

The researchers believe that their Bi-Fi biological internet could lead to the development of biosynthetic factories consisting of huge masses of microbes collaborating to produce complex fuels, pharmaceuticals and other useful chemicals. Even more exciting, the researchers say that with improvements, the technology could one day be used in more complex three-dimensional programming of cellular systems, such as the regeneration of tissue of organs. “The biological Internet is in its very earliest stages,” says Ortix. “When the information Internet was first introduced in the 1970s, it would have been hard to imagine the myriad uses it sees today, so there’s no telling all the places this new work might lead.”

The team’s findings appear online in the Journal of Biological Engineering.

Source: Stanford University And Gizmag

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