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The Two Common Mutations Causing Factor XI Deficiency in Jews Stem From Distinct Founders: One of Ancient Middle Eastern Origin and Another of More Recent European Origin
Hava Peretz,
Avital Mulai,
Sali Usher,
Ariella Zivelin,
Avihai Segal,
Zahavi Weisman,
Moshe Mittelman,
Hannah Lupo,
Naomi Lanir,
Benjamin Brenner,
Ofer Shpilberg, and
Uri Seligsohn
From the Institute of Thrombosis and Hemostasis, Department of Hematology, Chaim Sheba Medical Center, Tel-Hashomer, Israel; the Chemistry Laboratory, Sourasky Tel-Aviv Medical Center, Tel-Aviv, Israel; the Rosh-Haayin Outpatient Clinic, Rosh-Haayin, Israel; the Department of Medicine, Hasharon Medical Center, Petah-Tiqua, Israel; and the Thrombosis and Hemostasis Unit, Rambam Medical Center, Haifa, Israel.
Previous studies showed that factor XI (FXI) deficiency commonly observed in Ashkenazi Jews is caused by two similarly frequent mutations, type II (Glu117stop) and type III (Phe283Leu) with allele frequencies of 0.0217 and 0.0254, respectively. In Iraqi Jews, who represent the ancient gene pool of Jews, only the type II mutation was observed with an allele frequency of 0.0167. In this study we sought founder effects for each mutation by examination of four FXI gene polymorphisms enabling haplotype analysis in affected Jewish patients of Ashkenazi, Iraqi, and other origins and in Arab patients. Initial population surveys of 387 Middle Eastern Jews (excluding Iraqi Jews), 560 North African/Sephardic Jews, and 382 Arabs revealed allele frequencies for the type II mutation of 0.0026, 0.0027, and 0.0065, respectively. In contrast, the type III mutation was not detected in any of these populations. All 60 independent chromosomes bearing the type III mutation were solely observed in Ashkenazi Jewish patients and were characterized by a relatively rare haplotype. All 103 independent chromosomes bearing the type II mutation in patients of Ashkenazi, Iraqi, Yemenite, Syrian, and Moroccan Jewish origin and of Arab origin were characterized by another distinct haplotype that was rare among normal Ashkenazi Jewish, Iraqi Jewish, and Arab chromosomes. These findings constitute the first example of a mutation common to Ashkenazi Jews, non-Ashkenazi Jews, and Arabs and are consistent with the origin of type II mutation in a founder before the divergence of the major segments of Jews. Our findings also indicate that the type III mutation arose more recently in an Ashkenazi Jewish individual.
Blood, Vol. 90 No. 7 (October 1), 1997:
pp. 2654-2659
© 1997 by The American Society of Hematology.
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