What a wonderful bio-warfare project for the DNA labs.
WS
http://www.mnn.com/green-tech/research-innovations/stories/mystery-cause-of-irish-potato-famine-finally-solved
Mystery cause of Irish potato famine finally solved
John Platt
After 168 years, the pathogen that created the blight has been
identified - and it may never be seen again.
The Potato Famine Memorial in Dublin. (Photo: haselton68/Flickr)
The Irish Potato Famine killed about 1 million people in the mid-19th
century, but the exact strain of the potato blight that caused massive
crop failures has never been identified, until now.
According to research to be published in the journal eLife, the Great
Famine was caused by a previously unidentified strain of the
fungus-like pathogen Phytophthora infestans. Scientists have long
known that this pathogen caused the famine, but the events in Ireland
had previously been linked to a strain of the pathogen called US-1.
A research team led by Sainsbury Laboratory in the U.K. wanted to know
if that was true. They extracted DNA from several museum samples
collected in the 1840s - potato plant leaves that contained traces of
the blight - and compared them to modern-day strains of the pathogen.
They found that it was not US-1 and was, in fact, something new. "This
strain was different from all the modern strains that we analyzed -
most likely it is new to science," Sainsbury Laboratory's Sophien
Kamoun told BBC News. They have dubbed the strain HERB-1.
Kamoun said the research revealed something else: the HERB-1 blight
may no longer exist. "We can't be sure, but most likely it's gone
extinct," he said.
The researchers say HERB-1 likely originated in Mexico, which supports
long-held suppositions. Their genetic tests found that it was similar
to US-1, which is still found around the world. As they wrote in the
abstract to their paper, "HERB-1 is distinct from all examined modern
strains, but it is a close relative of US-1, which replaced it outside
of Mexico in the 20th century."
HERB-1 may have only existed on Earth for a few decades, and possibly
only a few years before it began its deadly impact. The US-1 and
HERB-1 strains "seem to have separated from each other only years
before the first major outbreak in Europe," co-author Hern�n Burbano
from the Max Planck Institute for Developmental Biology said in a news
release about the discovery.