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7/27/2019 Finally, A Map of All the Microbes on Your Body_Transcript
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< Finally, A Map Of All The Microbes OnYour Body
June 13, 2012 3:48 PM
Copyright 2012 NPR. For personal, noncommercial use only. See Terms of Use. For
other uses, prior permission required.
AUDIE CORNISH, HOST:
Scientists unveiled the results of an unusual census today. It's the
first catalog of the bacteria, viruses and other microorganisms that
populate every nook and cranny of the human body.
As NPR's Rob Stein reports, researchers hope the advance marks
an important step towards understanding how microbes help make
humans human.
ROB STEIN, BYLINE: The human body contains about 100 trillion
cells, but only maybe one in 10 of those cells is actually human.
The rest are from bacteria, viruses and other microorganisms.
LITA PROCTOR: The human we see in the mirror is made up of
more microbes than human.
STEIN: That's Lita Proctor of the National Institutes of Health. She's
in charge of a massive project. Hundreds of scientists are exploring
this invisible world, what scientists call the human microbiome.
PROCTOR: The definition of a human microbiome is all the
microbial microbes that live in and on our bodies, but also all the
genes, all the metabolic capabilities they bring to supportinghuman health.
STEIN: These microbes aren't just along for the ride. They're there
for a reason. We have a symbiotic relationship with them. We give
them a place to live and they help keep us alive.
PROCTOR: They belong in and on our bodies. They help digest
our food and they provide many kinds of protective mechanisms.
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STEIN: They teach our immune systems how to recognize
dangerous invaders. Martin Blaser at New York University says they
even produce helpful compounds that reduce inflammation and
fight off other bugs that could make us sick.
MARTIN BLASER: These microbes are part of our evolution. As far
as we can tell, they are very important in human health and
probably very important in human disease, as well.
STEIN: These bugs generally don't make us sick, but when we
disrupt the delicate ecosystems that they carefully construct in
different parts of our bodies, scientists think that can make us sick.
Again, Lita Proctor.
PROCTOR: There can be a disturbance in the immune system.
There can be some kind of imbalance and then you get a
microorganism which, under normal circumstances, lives in abenign way and can become a disease-bearing organism.
STEIN: Things like taking too many antibiotics or obsession with
cleanliness, even maybe delivering babies by C-sections. So the
idea behind the Microbiome Project was to get the first map of what
a normal, healthy microbiome looks like.
More than 200 scientists spent five years analyzing samples from
more than 200 healthy adults. The samples came from 18 differentplaces on their bodies, their mouths, noses, guts, behind each ear,
inside each elbow.
PROCTOR: This is the only study to date anywhere in the world
where people's microbiomes across the human body were sampled
and analyzed. Here was an effort to really investigate the full
landscape, if you will, of the human microbiome across the body.
STEIN: The first wave of results are being published in 16 papers
and four scientific journals this week. Among the results, scientists
identified some 10,000 species of microbes, including many never
seen before.
George Weinstock is working on the project at Washington
University in St. Louis.
GEORGE WEINSTOCK: This is like going into unchartered territory,
going into a forest and finding a new species of butterfly or a new
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2013 NPR
type of mammal or something like that, a new kind of bird.
STEIN: Those 10,000 species have more than eight mill ion genes,
which is more than 300 times the number of human genes and
scientists found some very interesting things when they compared
microbiomes.
PROCTOR: People were very different from each other, but skin
was more like skin and gut was more like gut, so the composition of
microbes and the kinds of genes they have are very much habitat-
specific.
STEIN: Now that scientists have an idea of what a healthy
microbiome looks like, George Weinstock says they can start to
explore this super organism, this complex mishmash of human and
microbial cells.
WEINSTOCK: How do they talk to our human cells and how do our
human cells talk back to them? Because it's really a concert that
they're playing together and that's what makes us who we are.
STEIN: Scientists have already discovered some intriguing clues.
For example, the microbes in a pregnant woman's birth canal start
to change just before she gives birth. Scientists think that's so their
babies are born with just the right microbiomes they'll need to live
long, healthy lives.
Rob Stein, NPR News.
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