Navigation Links
Berkeley Lab scientists help define the healthy human microbiome
Date:6/13/2012

You're outnumbered. There are ten times as many microbial cells in you as there are your own cells.

The human microbiomeas scientists call the communities of microorganisms that inhabit your skin, mouth, gut, and other parts of your body by the trillionsplays a fundamental role in keeping you healthy. These communities are also thought to cause disease when they're perturbed. But our microbiome's exact function, good and bad, is poorly understood. That could change.

A National Institutes of Health (NIH)-organized consortium that includes scientists from the U.S. Department of Energy's Lawrence Berkeley National Laboratory (Berkeley Lab) has for the first time mapped the normal microbial make-up of healthy humans.

The research will help scientists understand how our microbiome carries out vital tasks such as supporting our immune system and helping us digest food. It'll also shed light on our microbiome's role in diseases such as ulcerative colitis, Crohn's disease, and psoriasis, to name a few.

In several scientific reports published June 14 in Nature and in journals of the Public Library of Science, about 200 members of the Human Microbiome Project (HMP) Consortium from nearly 80 research institutions report on five years of research.

Berkeley Lab's role in mapping the human microbiome revolves around big data, both analyzing it and making it available for scientists to use worldwide.

3.5 terabases of data

HMP researchers sampled 242 healthy U.S. volunteers (129 male, 113 female), collecting tissues from 15 body sites in men and 18 body sites in women. Researchers collected up to three samples from each volunteer at sites such as the mouth, nose, skin, and lower intestine. The microbial communities in each body site can be as different as the microbes in the Amazon Rainforest versus the Sahara Desert.

Researchers then purified all human and microbial DNA in more than 5,000 samples and ran them through DNA sequencing machines. The result is about 3.5 terabases of genome sequence data. A terabase is one trillion subunits of DNA.

A comparative analysis system for studying human microbiome samples

Berkeley Lab scientists developed and maintain a comparative analysis system called the Integrated Microbial Genomes and Metagenomes for the Human Microbiome Project (IMG/M HMP). It allows scientists to study the human microbiome samples within the context of reference genomes of individual microbes. Reference genomes help scientists identify the microbes in a sample.

This system is a "data mart" of the larger IMG/M data warehouse that supports the analysis of microbial community genomes at the Department of Energy's Joint Genome Institute (JGI). IMG/M contains thousands of genomes and metagenome samples with billions of genes. A metagenome consists of the aggregate genomes of all the organisms in a microbial community.

"The IMG/M HMP data mart will help scientists advance our understanding of the human microbiome," says molecular biologist Nikos Kyrpides of Berkeley Lab's Genomics Division, who heads the Microbial Genome and Metagenome Programs at JGI. "Scientists can access HMP data with a click of a button and conduct comparative analyses of datasets."

Kyrpides is also a co-principal investigator of HMP's Data Analysis and Coordination Center (DACC), together with Victor Markowitz, who heads Berkeley Lab's Biological Data Management and Technology Center (BDMTC) in the Computational Research Division. Markowitz oversees the development and maintenance of the IMG/M system by BDMTC staff.

"Our system enables scientists worldwide to access and analyze the metagenome datasets generated by NIH's Human Microbiome Project. We plan to add to our system metagenome datasets generated by similar projects in Europe, Canada and Asia, and thus greatly enhance its comparative analysis potential," says Markowitz.

A job for high-performance computing

The computation involved in the metagenome data integration underlying IMG/M HMP was partly carried out at the Department of Energy's National Energy Research Scientific Computing Center (NERSC), which is located at Berkeley Lab. The Energy Sciences Network (ESnet), a high-speed network serving thousands of scientists worldwide that is hosted at Berkeley Lab, was instrumental in transferring the HMP datasets.

Two million computer hours were allocated on NERSC to carry out HMP data integration as well as sift through HMP data for 16S ribosomal RNA genes, which can be used to identify individual species. Focusing on this microbial signature allowed HMP researchers to subtract the human genome sequences and analyze only bacterial DNA.

The analysis helped scientists determine the diversity of microbial species within a person, including within different body sites in a person. It also revealed the extent to which microbial communities vary between people.

"The results suggest that each person has a relatively stable microbiome that is unique to them. You have your own personal microbiome," says Janet Jansson, a microbial ecologist in Berkeley Lab's Earth Sciences Division.

In addition, while scientists had previously isolated only a few hundred bacterial species from the body, HMP researchers now calculate that more than 10,000 species occupy the human ecosystem.

What's next?

"Now that we have a good idea of what makes up the healthy human microbiome, we can study what happens when it's perturbed because of disease, drugs, or diet," says Jansson,

In Jansson's lab, for example, scientists study the role of the gut microbiome in Crohn's disease, which is an inflammatory bowel disease. Changes in the composition or function of the trillions of microbes inhabiting the human intestine are associated with numerous diseases such as Crohn's. Understanding the factors underlying these changes will help researchers develop therapies to fight these diseases.

Similar research is also underway at other research centers. Scientists are using HMP data to study the nasal microbiome of children with unexplained fevers. They're also exploring how the vaginal microbiome undergoes a dramatic shift in bacterial species in preparation for birth, characterized by decreased species diversity.


'/>"/>

Contact: Dan Krotz
dakrotz@lbl.gov
DOE/Lawrence Berkeley National Laboratory
Source:Eurekalert

Related biology news :

1. Berkeley Lab scientists generate electricity from viruses
2. Consortium of scientists maps the human bodys bacterial ecosystem
3. Citizen scientists to document biodiversity with high-resolution imagery during summer solstice
4. Evaluation of microscopy techniques may help scientists to better understand ancient plants
5. Dont feel like exercise? Scientists find compound that may help you work out harder
6. Scientists identify mechanism for regulating plant oil production
7. NYBG scientists identify 81 new plant and fungus species
8. Scientists find that rain may not always be a welcome thing to waterbirds
9. Scientists discover huge phytoplankton bloom in ice-covered waters
10. Scientists identify first gene in programmed axon degeneration
11. UC Davis scientists find new role for P53 genetic mutation -- initiation of prostate cancer
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/1/2016)... , Feb. 1, 2016  Wocket® smart wallet ( www.wocketwallet.com ) announces ... personality, Joey Fatone . Las Vegas , ... --> Las Vegas , where Joey appeared ... The new video ad was filmed at the Consumer Electronics Show ... the Wocket booth to meet and greet fans. ...
(Date:1/25/2016)... --  Unisys Corporation (NYSE: UIS ) today announced the ... Airport, New York City , to help ... enter the United States using passports that ... testing of the system at Dulles last year. The system ... January 2016. --> pilot testing of the system ...
(Date:1/22/2016)... http://www.researchandmarkets.com/research/p74whf/global_biometrics ) ... "Global Biometrics Market in Retail Sector 2016-2020" ... --> http://www.researchandmarkets.com/research/p74whf/global_biometrics ) has announced the ... in Retail Sector 2016-2020" report to ... and Markets ( http://www.researchandmarkets.com/research/p74whf/global_biometrics ) has announced ...
Breaking Biology News(10 mins):
(Date:2/8/2016)... 2016  CytRx Corporation (NASDAQ: CYTR ), ... oncology, today announced that it has entered into ... Technology Growth Capital, Inc. and Hercules Technology III, ... --> --> ... financing under the loan and security agreement.  The ...
(Date:2/8/2016)... ... 2016 , ... Thomas J. Todorow has joined the University ... Corporate Services and the Chief Financial Officer at The Children’s Hospital of Philadelphia ... Care Contracting, Supply Chain, and Investments. , Prior to joining CHOP and The ...
(Date:2/8/2016)... , ... February 08, 2016 , ... ... wide range of loose, bulk foods at various stages of the production process. ... used to inspect large bulk products post packaging such as sacks of dry ...
(Date:2/8/2016)... has an active R&D program for the development of future ... has a unique research and development center in ... Control products. Stockton has a variety ... guidelines, and is active in more than 35 counties worldwide. ... Stockton,s flagship product Timorex Gold ® is ...
Breaking Biology Technology: