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PETBioNewsNewsHuman genetic variation mapped from 1,000 genomes

BioNews

Human genetic variation mapped from 1,000 genomes

Published 5 November 2012 posted in News and appears in BioNews 680

Author

Dr Nikki Davis

Image by Peter Artymiuk via the Wellcome Collection. Depicts the shadow of a DNA double helix, on a background that shows the fluorescent banding of the output from a DNA sequencing machine.
CC BY 4.0
Image by Peter Artymiuk via the Wellcome Collection. Depicts the shadow of a DNA double helix, on a background that shows the fluorescent banding of the sequencing output from an automated DNA sequencing machine.

Over 1,000 people from 14 countries have had their genomes mapped by scientists. The researchers say their study will help them examine genetic variations at the scale of national populations and further identification of the rare genetic variations related to many diseases...

Over 1,000 people from 14 countries have had
their genomes mapped by scientists. The researchers say their study will
help them examine genetic variation at the scale of national populations and identify more rare mutations associated with disease.

The international consortium, called The 1,000
Genomes Project, identified over 39 million mutations, most common and already
known, but some rare. The rare variants were often restricted to specific local
populations and many of these were described for the first time.

Professor Gil McVean of the University
of Oxford, the lead author of the study said: 'Our research has found that each
apparently healthy person carries hundreds of rare variants of genes that have
a significant impact on how genes work, and a handful - from two to five - of
rare changes that have been identified as contributing to disease in other
people'.

The pilot study was launched in
2008 (reported in BioNews 442) and the first phase of the project involved the sequencing
the genomes only six people. Since then the genomes of 1,092 people from the UK, Europe, East Asia, sub-Saharan
Africa, and the Americas have been sequenced.

The scientists found that most common genetic
variants are shared across global populations. However, according
to Professor McVean, the most exciting find was that rare variants were usually
geographically restricted. This information — and all the data is fully accessible to other
researchers - will help scientists to interpret a person's
genome in the context of the local genetic variation.

'The DNA donors in the study were
not known to have any diseases, so this study gives us the genomic background we need for
understanding which genetic variants are "within the normal range"',
said Professor Aravinda Chakravarti of the John Hopkins School of Medicine in
Baltimore, USA, who is involved in the project. 'With this
tool, scientists now have a standard with which they can compare the genome of
someone with diabetes, for example'.

However the study, published in the journal Nature, does have limitations. 'None of
the 1,092 individuals in this project had their phenotype [their observable
traits] characterised', Professor Eric Topol from the Scripps Research
Institute, who was not involved in the study, told The Scientist. Without
knowing the participant's phenotype, Professor Topol said, links cannot be made
with the person's overall health.

Still, Dr Ewan Birney from the
European Bioinformatics Institute, who is not part of the consortium, told The
Scientist that 'The 1,000 Genomes Project is the backbone of our understanding
for human variation. Both the data and the methods will be reused many times in
the forthcoming decade'.

The final phase of the project, which is expected to
finish next year, will sequence the genomes of a further 1,500 people from 12 new populations, including those in South Asia
and parts of Africa.

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