Eikonal Blog

2011.04.21

Gut bacteria, second brain, etc

Filed under: health, mind & brain — Tags: , , , — sandokan65 @ 13:37
  • “Your Gut, Your Brain, and Economics – Should Economists Considers Gut-Brain Communication?” by Daniel R. Hawes (Psychology Today; 2011.08.02) – http://www.psychologytoday.com/blog/quilted-science/201108/your-gut-your-brain-and-economics
  • “Gut flora: You are what your bacteria eat” by Neil Katz (CBS News; 2011.04.21) – http://www.cbsnews.com/8301-504763_162-20056028-10391704.html
  • “Scientist Find Gut Bacteria Divides People Into Three Types” (FOX News; 2011.04.21) – http://www.myfoxhouston.com/dpps/health/scientist-find-gut-bacteria-divides-people-into-three-types-dpgoha-20110421-fc_12862614
    Three enterotypes
  • “Bacteria Divide People Into 3 Types, Scientists Say” by Carl Zimmer (NYTimes; 2011.04.20) – http://www.nytimes.com/2011/04/21/science/21gut.html
    • Enterotype 1:
      • produces more enzymes for making vitamin B7 (also known as biotin).
      • high levels of bacteria called Bacteroides
    • Enterotype 2:
      • produces more enzymes for vitamin B1 (thiamine).
      • Bacteroides were relatively rare, while the genus Prevotella was unusually common.
    • Enterotype 3
  • “Enterotypes of the human gut microbiome” (Nature; 2011.04.20?) – http://www.nature.com/nature/journal/vaop/ncurrent/full/nature09944.html
      Abstract: Our knowledge of species and functional composition of the human gut microbiome is rapidly increasing, but it is still based on very few cohorts and little is known about variation across the world. By combining 22 newly sequenced faecal metagenomes of individuals from four countries with previously published data sets, here we identify three robust clusters (referred to as enterotypes hereafter) that are not nation or continent specific. We also confirmed the enterotypes in two published, larger cohorts, indicating that intestinal microbiota variation is generally stratified, not continuous. This indicates further the existence of a limited number of well-balanced host–microbial symbiotic states that might respond differently to diet and drug intake. The enterotypes are mostly driven by species composition, but abundant molecular functions are not necessarily provided by abundant species, highlighting the importance of a functional analysis to understand microbial communities. Although individual host properties such as body mass index, age, or gender cannot explain the observed enterotypes, data-driven marker genes or functional modules can be identified for each of these host properties. For example, twelve genes significantly correlate with age and three functional modules with the body mass index, hinting at a diagnostic potential of microbial markers.
  • “How Microbes Defend and Define Us” by Carl Zimmer (NYTimes; 2010.07.12) – http://www.nytimes.com/2010/07/13/science/13micro.html
    How Microbes Defend and Define Us
  • “A human gut microbial gene catalogue established by metagenomic sequencing” (Nature; 2010.03.04) – http://www.nature.com/nature/journal/v464/n7285/full/nature08821.html

Leave a Comment »

No comments yet.

RSS feed for comments on this post. TrackBack URI

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

Create a free website or blog at WordPress.com.

%d bloggers like this: