Saturday, April 8, 2017

Publication Alert: High Nucleotide Resolution Study of the Skin Virome

We identified diversity generating retroelements as a
potential mechanism driving targeted genomic diversity.

A few weeks ago some colleagues and myself published a new manuscript looking at the diversity of the human skin virome. In our previous previous work, we evaluated the diversity of viruses on the skin. Other groups have looked at virus diversity at other body sites including the gut, lungs, and oral cavity. Our new paper focused on the diversity within viruses on the skin. It provided initial insight into the genomic variability associated with major viruses in the skin virome. In other words, it was a "high resolution" study of the virome.

Sunday, March 12, 2017

Correlations In Random Genomic Data: A Simple Biology Pitfall

Wow it has been a long time since we have had a post on here! As always, that means other projects are in the works and the blog has taken a bit of a back seat, but we are back and ready to talk science. This week I wanted to get to a topic I have been meaning to get to for a while. If you are a frequent reader, you know that every now and then I like to go over some basic statistics topics that cause confusion among biologists, as well as scientists in other fields. This week I want to cover a common statistical pitfall, with the hopes that it will prevent readers from making simple mistakes. The topic for this post will be obtaining statistically significant correlations from random gene expression data.

Saturday, January 28, 2017

A Model for Phage Communication and the Implications for the Human Microbiome

The research group prepared
two types of media to test phage
infection efficacy.
Well we took a bit of a break these past couple of weeks, but we are back for the new year! Welcome to the Prophage blog 2017! The year has actually been off to a good start, with a lot of interesting papers being published this January. This week I want to kick things off by covering a very cool 2017 study by Erez et al that described an new and interesting mechanism by which bacteriophages communicate using their bacterial hosts. This really is a well written and elegant study that I highly suggest you read. In this post, I want us to cover the highlights of the study, and then discuss what this will mean for future research endeavors.

The research group led by Erez et al began their work by testing the hypothesis that "bacteria secrete communication molecules to alert other bacteria of phage infection", but what they ended up finding was arguably much more interesting. They began their series of experiments by simply growing bacteria in liquid media with and without bacteriophages (see the figure to the right). They let the mixture sit long enough for the phages to infect their bacterial hosts for a couple of replication cycles (3 hours), and then removed all of the bacteria and phages from the liquid by filtration. At this point, if there was a signaling molecule released during the infection, it would still be in the media even though the phages and bacteria were removed. Additionally, if there was a signaling molecule released during the phage infection period, repeating an infection in that same media would result in altered growth patterns (for example, less bacteria killed when the molecule is present). As it turns out, this is exactly what they observed.