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Recently published research in the field of molecular genetics -- the study of DNA sequences -- indicates that Jewish populations of the various Diaspora communities have retained their genetic identity throughout the exile. Despite large geographic distances between the communities and the passage of thousands of years, far removed Jewish communities share a similar genetic profile. This research confirms the common ancestry and common geographical origin of world Jewry. Jewish men from communities which developed in the Near East -- Iran, Iraq, Kurdistan, Yemen -- and European Jews have very similar, almost identical genetic profiles.
The basis of this new field of population research is the study of the Y-chromosome, which is passed virtually unchanged from father to son. The rare mutations -- which are changes in the non-coding portion of its DNA -- can serve as markers, which can distinguish peoples. By studying the genetic signatures of various groups, comparisons can be made to determine the genetic relationships between the groups. Y-chromosome research of the Jewish people began as an outgrowth of the study of Cohanim -- the Jewish priestly family. These studies showed a very high genetic affinity among present-day Cohanim, indicating that they do have a common paternal ancestor, estimated to have lived some 3,000 years ago. (See The Cohanim/DNA Connection) MOST RECENT RESEARCH The most recent genetic research consists of obtaining DNA samples, and doing laboratory analysis and comparison of the DNA markers on the Y-chromosome -- which is passed from father to son, and on the mtDNA (mitrocondrial DNA) -- which is passed intact from mother to son and daughter. This genetic anthropology promises to be particularly informative for tracking the history of Jewish populations, and helping to resolve the debate on the origins and migrations of Jewish communities in the Diaspora. The researchers proposed to answer the question whether the scattered groups of modern Jews can be identified as the descendants of the ancient Hebrews of the Bible, or whether their common ancestry has been diluted through influx of converts and through intermarriage so that little remains of their "Jewish genes." The complex recorded history of dispersal from the Land of Israel and subsequent residence in and movements between various countries in Europe, North Africa and the Middle East is expected to produce a complex pattern of genetic relationships among Jewish populations as well as between them and the non-Jewish peoples among whom they lived. The research was based on samples from 29 populations, 7 Jewish, categorized into five major divisions: Jews, Middle-Eastern non-Jews, Europeans, North Africans, and sub-Saharan Africans.
The findings were that most Jewish communities -- long separated from one another in Europe, North Africa, the Near East and the Arabian Peninsula -- do indeed seem to be genetically similar and closely related to one another, sharing a common geographical origin. These Jewish communities are more closely related to each other and to other Middle Eastern Semitic populations -- Palestinians, Syrians, and Druze -- than to their neighboring non-Jewish populations in the Diaspora. The results also indicate a low level of admixture (intermarriage, conversion, rape, etc.) into the gene pool of these various Jewish communities. Among the Jewish communities sampled, North Africans (Moroccans, etc.) were most closely related to Babylonian (Iraqi) Jews. These populations may best represent the paternal gene pool of the ancient Jewish/Hebrew population dating back to the First Temple period, before the Babylonian exile (approx. 2,500 years ago). The Y-chromosome signatures of the Yemenite Jews are also similar to those of other Jewish and Semitic populations. In contrast, the paternal gene pool of Ethiopian Jews more closely resembles that of non-Jewish Ethiopian men. ASHKENAZI LINKS Although the Ashkenazi (European) Jewish community separated from their Mediterranean ancestors some 1,200 years ago and lived among Central and Eastern European gentiles, their paternal gene pool still resembles that of other Jewish and Semitic groups originating in the Middle East. A low rate of intermarriage between Diaspora Jews and local gentiles was the key reason for this continuity. Since the Jews first settled in Europe more than 50 generations ago, the intermarriage rate was estimated to be only about 0.5% in each generation.
The Ashkenazi paternal gene pool does not appear to be similar to that of present-day Turkish speakers. This finding opposes the suggestion that Ashkenazim are descended from the Kuzars, a Turkish-Asian empire that converted to Judaism en masse in or about the 8th century CE. The researchers are continuing and expanding their studies particularly of the Ashkenazi community. They are hoping that by examining the DNA markers in Jewish populations from different parts of Europe, they will be able to infer the major historical and demographic patterns in Ashkenazi populations. MIGRATION CLUES In addition to questions of medical interest, there are many interesting possibilities concerning the origin of Ashkenazi populations and how they migrated in Europe. It seems likely that Jews began to arrive in Europe perhaps 1,000 to 1,200 years ago, when settlement was already sufficiently developed to provide them with opportunities to make a living. One theory claims that the Jews of Eastern Europe derive predominantly from Jewish migrants from the Rhineland or from Italy, being fairly direct descendants of the original ancient Jewish/Hebrew populations. A second theory suggests a northerly migration from the Balkans or from Central Asia, with the possibility of large-scale conversions of Slavs and/or Kuzars to Judaism. This argument parallels the controversy over the origin and development of Yiddish -- the language of Eastern European Jews. One theory proposes that Jews, migrating from the Rhineland and neighboring regions spoke an old form of German which provided the basis of Yiddish. Other scholars reject the German origin of Yiddish. These linguists see Yiddish grammar as fundamentally Slavonic, with modern Yiddish developed by incorporating large numbers of German and Hebrew words into the context of a basically Slavic grammar and syntax. There has not been enough historical evidence to decide between such theories. Now, with the newly developed genetic methods, it is possible to test these ideas, for example to see if there was a significant Slavic contribution to modern Ashkenazic Jewry. CONTINUING RESEARCH The researchers plan to continue their research by investigating genetic variation in populations that can trace their Jewish ancestry to localized communities of Europe, in order to better understand the history and development of Ashkenazic Jewry.
These genetic research findings support Jewish tradition -- both written and oral. After over 1,000 years of history in the Land of Israel, Jews dispersed to many and distant locations throughout the world. Some Jewish exile communities were relatively stable for two millennia -- such as in Babylonia (Iraq) and Persia (Iran). Others developed centuries later, following successive migrations to North Africa and Europe. All of these communities maintained their Jewish customs and religious observance despite prolonged periods of persecution. Jews remained generally culturally isolated from their host communities. These genetic studies are a testimony to Jewish family faithfulness. Only the Jewish people in the history of mankind has retained its genetic identity for over 100 generations, while being spread throughout the world -- truly unique and inspiring. Perhaps, even more unique and inspiring, is that this most unlikely scenario was a prophecy and a promise.
Published: Sunday, July 02, 2000
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Y chromosome alone
The Y chromosome studies are useful when searching for descendants of Israelite tribes. In the Old Testament tribal identity was passed from father to son. For example, to this day, one cannot become a Levite or Cohes if one's father is not a Levite or Cohen. However, one can be a Levite or Cohen if one's mother is not a Levite or Cohen. As such when looking for descendants of the "The Lost Tribes of Israel" many are looking for men who married gentiles but share a patrilineal identity with the known sons of Abraham (descendants of Judah, Levi, Aaron, Samaritans, Bene Israel of India etc).
(21) Daniel Richter, 29/4/2008
what's wrong with establishing a pedigree?
Personally I'd like to know, if possible, whether I am more of a Kuzar or a German or an ancient Israelite than the next guy. Then I will attach my own subjective meaning to those findings whether they be superiority or inferiority or indifference. I find it very insulting to hear people go on about how we're all basically the same.
They are the same people who kvell about their kids being dentists or living in Israel and studying at the Technion.
(20) Kevin, 16/3/2008
Haplogroup Q runs at about 6-8 percent in the middle east. Remember there were 12 tribes of israel. As to where those other 10 tribes came from, nobody knows. And to be honest, I personally think it is difficult a lot of times to distinguish jews between mizrachi and ashkenazi origin. People thought my grandfather was yemenite jewish and father was iranian jewish. They all spoke yiddish. Go figure. You can't focus on one haplogroup. But, there is a common theme where there are x y and z haplogoups that run in the middle east (doesn't have to be J1 and J2) and ashkenazi populations. The only fact I know is that many dutch jews (from spain and portugal) intermixed with the dutch. As to why, I do not know.
(19) Steve Sconosciuto, 20/10/2007
Fallacious Argument
Even if 40%-50% of Ashkenazic and/or Sephardic males display haplogroups J1 or J2, that in itself does not argue for relative genetic purity of the Jewish people. The Y chromosome is one of 46 in the genome. Excepting the X chromosome in males, the remaining 44 are subject to recombination. Suppose--as is undoubtedly the case in many communities, such as among the Jews of Africa and China--that Jewish merchants arrived in a locale and set up a trading post, as almost certainly happened with the Jews of Elephantine in southern Egypt. The males (who were certainly the majority of any trading expedition) then took local (i.e., non-Jewish) women as wives. Their sons would bear the Jewish paternal Y chromosome, but the remaining chromosomes would be 50% foreign. Their daughters would be 50% foreign since no Y chromosome was involved. Now these children have children. The sons of the sons still bear the paternal Jewish Y chromosome, but not the daughters of the sons and not the daughters of the daughters. In fact, ALL of the children and grandchildren would have maternal mitochondrial DNA as well as the admixed other maternal genes. Now, take the sons of the sons again. In the extreme case, each generation of sons could marry with non-Jewish women who converted to Judaism. Their sons would still bear the paternal Jewish Y chromosome, but it is obvious that their genetic make-up would be almost entirely non-Jewish. The African and Chinese Jews are phenotypic proof of this phenomenon, and in many instances, this is also true of the Ashkenazim, many of whom bear obvious Germanic and Slavic features. Thus, the common Middle Eastern origin of Diaspora populations is largely a matter of the Y chromosome alone, not of the entire Jewish genome.