Study finds genetic links between Jews and Arabs
By Dina Kraft
Associated Press
JERUSALEM -- Tradition says the biblical patriarch Abraham fathered
both the Jewish and Arab nations. Now, new DNA-based research reveals a
genetic link between Jews and Palestinians, suggesting the two peoples,
locked in a bitter struggle for more than a century, indeed share a common
ancestry dating back 4,000 years.
The study, published Tuesday in "The Proceedings of the National
Academy of Sciences" in Washington, D.C., says the Y chromosome found in
Jewish men may go back to a common pool of Middle Eastern ancestors. After
the first major Jewish exile of 586 B.C., when Jews dispersed across
Europe and North Africa, Jews largely retained their genetic identity, one
that was formed in the Middle East, according to the study, led by Michael
Hammer of the University of Arizona.
Even after centuries of exile, Diaspora Jews remained closer to each
other and more similar to Palestinians, Syrians and Lebanese in terms of
shared Y chromosome characteristics than to people in their host
countries, the study says. "Eventually people will realize that they are
not that different," said Batsheva Bonne-Tamir, a geneticist from Tel Aviv
University who participated in the study.
Still, she cautioned that the techniques were new and that until the
human genome is mapped, it will be difficult to be certain about the
conclusions. The study compared the male, or Y, chromosome, which is
passed from father to son in 1,371 males from seven groups of Israeli Jews
of various origins and 16 non-Jewish groups in the Middle East, Africa and
Europe.
Hammer identified 19 variations of the Y chromosome, including eight
lineages found to varying degrees among Jews and Arabs. Based on this
measure, the study found that despite the many centuries their ancestors
had spent in exile in different parts of the world, the Israeli Jews in
the sample had the closest genetic links. Next in genetic affinity to Jews
were Palestinians and Syrians, followed by Saudi Arabians, Lebanese, and
Druse, a Middle Eastern sect that practices a secret form of Islam.
According to the research, in one of the lineage branches, the
percentage of variation in the Y chromosome between Jews and Palestinians
differed by only 1 percent compared to a difference of 5 percent between
Jews and Europeans. A low rate of intermarriage between Diaspora Jews and
gentiles was a key reason for the continuity, Bonne-Tamir said. For
example, since Jews first settled in Europe 80 generations ago, the
intermarriage rate was estimated to be only about 0.5 percent in each
generation.
As a result, according to the Y chromosome results, Jews of European
descent living in Israel have closer genetic affinity to Syrians than to
the non-Jews of the countries they came from. Hebrew University geneticist
Howard Cedar said even though Y chromosomes are considered the best tool
for tracing genetic heritage, researchers still don't know what the
history is behind the variations. As a result, it is difficult to draw
conclusions about genetic affinity.
"The problem is in the interpretation," Cedar said. "It's very
difficult to reconstruct the histories of these events, it's difficult to
interpret." Bonne-Tamir, who heads the National Laboratory for the
Genetics of Israeli Populations, said that until recently, such research
on genetic affinity was limited to classical markers, such as blood groups
and enzymes.
The genetic link between Jews and Arabs suggested by the study
is reflected in the biblical account in Genesis of how Abraham fathered
two sons: Ishmael by his wife's maid Hagar, and then, when Sarah was able
to conceive, Isaac. Although Muslims give a different version of the
story, they revere Abraham and Ishmael -- or Ibrahim and Ismail, -- just
as Jews do Abraham and Isaac.
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