A New Way To Block Unwanted Genetic Transfer

Arthur T Knackerbracket has found the following story:

We receive half of our genes from each biological parent, so there's no avoiding inheriting a blend of characteristics from both. Yet, for single-celled organisms like bacteria that reproduce by splitting into two identical cells, injecting variety into the gene pool isn't so easy. Random mutations add some diversity, but there's a much faster way for bacteria to reshuffle their genes and confer evolutionary advantages like antibiotic resistance or pathogenicity.

Known as horizontal gene transfer, this process permits bacteria to pass pieces of DNA to their peers, in some cases allowing those genes to be integrated into the recipient's genome and passed down to the next generation.

The Grossman lab in the MIT Department of Biology studies one class of mobile DNA, known as integrative and conjugative elements (ICEs). While ICEs contain genes that can be beneficial to the recipient bacterium, there's also a catch-receiving a duplicate copy of an ICE is wasteful, and possibly lethal. The biologists recently uncovered a new system by which one particular ICE, ICEBs1, blocks a donor bacterium from delivering a second, potentially deadly copy.

"Understanding how these elements function and how they're regulated will allow us to determine what drives microbial evolution," says Alan Grossman, department head and senior author on the study. "These findings not only provide insight into how bacteria block unwanted genetic transfer, but also how we might eventually engineer this system to our own advantage."

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