[meteorite-list] Scientists Confirm That Parts of Earliest Genetic Material May Have Come from the Stars (Murchison Meteorite)

[Ron Baalke]

Imperial College London
London, U.K.

Contact:

Colin Smith
Press Officer, Imperial College London
Tel: +44 (0)207 594 6712

Dr Zita Martins
Department of Earth Science and Engineering
South Kensington Campus
Imperial College London
London SW7 2AZ, UK
Tel: +44 (0)20 7594 9982
Fax: +44 (0)20 7594 7444
http://www.imperial.ac.uk/people/z.martins

For Immediate Release: Friday 13 June 2008

Scientists confirm that parts of earliest genetic material may have come
from the stars

Scientists have confirmed for the first time that an important component of
early genetic material which has been found in meteorite fragments is
extraterrestrial in origin, in a paper published on 15 June 2008.

The finding suggests that parts of the raw materials to make the first
molecules of DNA and RNA may have come from the stars.

The scientists, from Europe and the USA, say that their research, published
in the journal Earth and Planetary Science Letters, provides evidence that
life's raw materials came from sources beyond the Earth.

The materials they have found include the molecules uracil and xanthine,
which are precursors to the molecules that make up DNA and RNA, and are
known as nucleobases.

The team discovered the molecules in rock fragments of the Murchison
meteorite, which crashed in Australia in 1969.

They tested the meteorite material to determine whether the molecules came
from the solar system or were a result of contamination when the meteorite
landed on Earth.

The analysis shows that the nucleobases contain a heavy form of carbon which
could only have been formed in space. Materials formed on Earth consist of a
lighter variety of carbon.

Lead author Dr Zita Martins, of the Department of Earth Science and
Engineering at Imperial College London, says that the research may provide
another piece of evidence explaining the evolution of early life. She says:
"We believe early life may have adopted nucleobases from meteoritic
fragments for use in genetic coding which enabled them to pass on their
successful features to subsequent generations."

Between 3.8 to 4.5 billion years ago large numbers of rocks similar to the
Murchison meteorite rained down on Earth at the time when primitive life was
forming. The heavy bombardment would have dropped large amounts of meteorite
material to the surface on planets like Earth and Mars.

Co-author Professor Mark Sephton, also of Imperial's Department of Earth
Science and Engineering, believes this research is an important step in
understanding how early life might have evolved. He added: "Because
meteorites represent left over materials from the formation of the solar
system, the key components for life -- including nucleobases -- could be
widespread in the cosmos. As more and more of life's raw materials are
discovered in objects from space, the possibility of life springing forth
wherever the right chemistry is present becomes more likely."

-Ends-

Notes to editors:

1. "Extraterrestrial nucleobases in the Murchison meteorite", Earth and
Planetary Science Letters, Sunday 15 June 2008 (Print publication)
Zita Martins (1,2), Oliver Botta (3,4,5), Marilyn L. Fogel (6), Mark A.
Sephton (2), Daniel P. Glavin
(3), Jonathan S. Watson (7), Jason P. Dworkin (3), Alan W. Schwartz (8),
Pascale Ehrenfreund (1,3)

(1) Astrobiology Laboratory, Leiden Institute of Chemistry, 2300 RA Leiden,
The Netherlands
(2) Department of Earth Science and Engineering, Imperial College, London,
SW7 2AZ, UK
(3) NASA Goddard Space Flight Center, Code 699, Greenbelt, MD 20771, USA
(4) Goddard Earth Sciences and Technology Center, University of Maryland
Baltimore, County, Baltimore, MD 21228, USA
(5) International Space Science Institute, Hallerstrasse 6, 3012 Bern,
Switzerland
(6) GL, Carnegie Institution of Washington, Washington, DC 20015, USA
(7) Planetary and Space Sciences Research Institute, The Open University,
Walton Hall, Milton Keynes, MK7 6AA, UK
(8) Radboud University Nijmegen, 6525 ED, Nijmegen,The Netherlands

A full copy of the research can be downloaded at:
     http://dx.doi.org/10.1016/j.epsl.2008.03.026

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