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Origins of Hyperphenylalaninemia in Israel

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Origins of Hyperphenylalaninemia in Israel Original Paper 1610118 Eur J Hum Genet 1994;2:24-34 Sandra Kleiman a Origins of Hyperphenylalaninemia Smadar Avigad* Lina Vanagaitea in Israel Aryeh Shmuelevitzb Miriam Davida Randy C. Eisensmithc Nathan BrandA Gerard Schwartzd Françoise Rey* Arnold Munniche Savio L.C. Wooc Yosef Shiloha a Department of Human Genetics, Sackler School of Medicine, Abstract b Department of Middle Eastern and Mutations and polymorphisms at the phenylalanine hydroxy­ African History, Tel Aviv University, Ramat Aviv, Israel; lase (PAH) gene were used to study the genetic diversity of the c Howard Hughes Medical Institute, Jewish and Palestinian Arab populations in Israel. PAH muta­ Department of Cell Biology and tions are responsible for a large variety of hyperphenylalani- Institute of Molecular Genetics, Baylor College of Medicine, Houston, Tex., nemias (HPAs), ranging from the autosomal recessive disease USA; phenylketonuria to various degrees of nonclinical HPA. Sev­ d Child Development Institute, Sheba Medical Center, Tel Hashomer, Israel, enty-two Jewish and 36 Palestinian Arab families with various and HP As, containing 115 affected genotypes, were studied by c Unité de Recherches sur les Handicaps haplotype analysis, screening for previously known PAH le­ Génétique de l’Enfant, INSERM U-12, Hôpital des Enfants-Malades, Paris, sions and a search for novel mutations. Forty-one PAH haplo­ France types were observed in this sample. Four mutations previously identified in Europe (IVS10nt546, R261Q, R408W and RI 58Q) were found, and were associated with the same haplo­ types as in Europe, indicating possible gene flow from Euro­ pean populations into the Jewish and Palestinian gene pools. Of particular interest is a PAH allele with the IVS10nt546 mutation and haplotype 6, that might have originated in Italy KeyWords more than 3,000 years ago and spread during the expansion of Hyperphenylalaninemia the Roman Empire. These results, together with previous Phenylketonuria identification of three PAH mutations unique to Palestinian Phenylalanine hydroxylase Arabs [IVSnt2, Edel( 197-205) and R270S], indicate that the Haplotypes relatively high genetic diversity of the Jewish and Palestinian Mutations populations reflects, in addition to genetic events unique to Jews these communities, some gene flow from neighboring and con­ Palestinian Arabs quering populations. Received: July 9,1993 Yosef Shiloh ©1994 Revision received: November 11,1993 Department of Human Genetics S. Karger AG, Basel Accepted: November 22,1993 Sackler School of Medicine 1018-4813/94/ Tel Aviv University 0021-0024S5.00/0 Ramat Aviv 69978 (Israel) Introduction [4-7], PAH mutations show strong linkage disequilibrium with specific polymorphic ha­ Characterization of mutant genes associat­ plotypes at the PAH locus [1-3]. Thus, mu­ ed with hereditary diseases is aimed primarily tant PAH genes can be ‘tagged’ with specific at understanding the molecular basis of these mutation-haplotype combinations, which en­ disorders. However, identification of se­ able one to follow their spread in different quence variations associated with normal and populations with great specificity [8]. defective alleles can also contribute to our More than 2 million Israeli newborns have understanding of the mechanisms underlying been screened for HPA since 1960. PAH defi­ the dynamics of gene flow among human pop­ ciencies were identified in some 450 infants, ulations. Alleles marked by mutations or poly­ 30% of them showing PKU and the rest non- morphic haplotypes or a combination of both PKU HPA [9-11; unpubl. data]. Both types of may serve as useful markers to study the inter­ HPA were identified among Jews and Pales­ relationships between various ethnic groups tinian Arabs. These two populations differ and the origins of their genetic diversity. from the European and Asian communities The gene encoding the hepatic enzyme studied thus far, and from each other. The phenylalanine hydroxylase (PAH) has recent­ Jewish population is composed mostly of im­ ly been a focus of such investigations. PAH migrants from a variety of countries, and their catalyzes the irreversible hydroxylation of descendents, while the Palestinian Arab pop­ phenylalanine to tyrosine, thereby opening ulation reflects the migrations and foreign the catabolic pathway of this essential amino conquests that have swept this country since acid. Mutations in this gene cause a wide the time of the Roman Empire. Both ethnic spectrum of disorders collectively called hy- groups are therefore expected to show consid­ perphenylalaninemias (HPAs) [1]. Extreme erable genetic diversity for their small size. HPA is expressed as the autosomal recessive We are tracing the origins of this diversity, disease phenylketonuria (PKU), which causes using as a probe the mutations and polymor­ severe mental retardation. Early diagnosis of phisms of the PAH gene. PKU and subsequent treatment with a low- phenylalanine diet can considerably reduce the brain damage, making newborn screening for HPA a common practice in many coun­ Subjects and Methods tries. Milder HP As have no clinical conse­ Sample Population quences and are usually identified by bio­ The population of individuals affected with HP As chemical tests. in Israel, and their ascertainment, have been described Extensive studies in European, Mediterra­ previously [4, 9-11]. The great majority of HPA cases nean and Asian communities recently dis­ in the Jewish population was identified among Sephar­ dic and Oriental Jews, rather than in Ashkenazi com­ closed a wide variety of PAH mutations un­ munities [9,10], Over a period of 5 years, we collected derlying these conditions [see ref. 2, 3 for peripheral blood samples from 72 Jewish and 36 Pales­ reviews]. Mutations which affect PAH activi­ tinian families with HP As. Since our primary interest ty severely result in PKU in homozygotes or was directed towards PKU, in most of these families (a compound heterozygotes, while non-PKU total of 88) the probands had PKU. In 13 families non- PKU HPA was identified, and in 7 families both con­ HPA is usually caused by compound hetero­ ditions were segregating [see ref. 4 for a detailed zygosity for a mutation of the severe type and description of these families]. Altogether, 115 affected a mutation with a milder effect on the protein genotypes were studied (each of the 7 families with 25 Table 1. Polymorphic haplotypes identified in nor­ both PKU and non-PKU HPA contributed 2 affected mal and mutant PAH genes in 108 studied families genotypes). Among the Jewish families, 65 were of Sephardic or Oriental origin, 5 were Ashkenazi and 2 Haplo­ Jews Palestinian Arabs represented ‘mixed marriages’. The parents were con­ types1 sanguineous in 34 of the 36 Palestinian families and in normal mutant normal mutant 6 of the 72 Jewish families. genes genes Molecular Methods 1 32 292 14 392 2 7 3 1 3 Extraction of genomic DNA from peripheral blood 3 2 3 samples, haplotype analysis, identification of pre­ 4 34 16 14 4 viously known mutations and the search for new muta­ 5 4 3 3 4 tions have been previously described in detail [4, 12- 6 2 21 2 12 16]. 7 6 6 7 8 8 2 9 2 10 4 2 Results ll l 1 12 7 1 4 14 1 Polymorphic Haplotypes at the PAH Locus 15 1 Eight RFLPs conveniently detected by the 18 1 1 full cDNA of PAH [17, 18] were used to con­ 19 1 27 3 1 2 struct polymorphic PAH haplotypes in all the 28 10 4 2 families studied. Forty-one haplotypes were 29 1 observed in the sample population. Their dis­ 32 1 33 2 tribution among normal and mutant PAH 36 1 2 genes is shown in table 1. Complete haplotype 37 2 analysis was not possible in some families, 41 1 2 42 1 2 4 since not all parents were available. In other 43 1 families, heterozygosity of all family members 44 1 for one or two RFLPs and unavailability of 47 1 50 1 additional family members precluded haplo­ 52 2 1 type construction. Hence, the final number of 56 1 haplotyped chromosomes is slightly smaller 57 1 58 1 than expected on the basis of the sample size. 59 1 Except for haplotype 6del which is unique to 61 1 Yemenite Jewish PKU patients [19], all of the 62 1 63 1 haplotypes identified in this study have also 64 1 been observed in European and Mediterra­ 65 1 nean populations [2, 3, 8, 18, 20]. 66 1 6del3 52 Although a considerable variety of haplo­ Total 135 144 63 76 types was found among Jews and Palestinian Arabs, in both groups most of the haplotypes l Haplotype designation is according to Woo [18]. occurred on a single or small number of chro­ 2 Significantly different between Jews and Palestin­ mosomes, with three or four haplotypes pre­ ian Arabs (p < 0.001). 3 A derivative of haplotype 6 containing a deletion dominant. Haplotypes 1, 4 and 6 were abun­ that eliminates the PvuII (b) RFLP [19]. dant among both Jews and Palestinians; ha­ plotype 28 was also frequent among Jews, as 26 Kleiman et al. Hyperphenylalaninemia in Israel Table 2. Geographic origin of mutant PAH genes among Jews Country Haplotypes of origin 1 2 4 5 6del 6 7 10 12 18 27 28 36 41 64 Algeria 1 1 Tunisia 2 1 Morroco 4 4 16 1 1 2 Egypt 1 Yemen 3 1 52 1 1 2 Iraq 8 1 1 1 Iran 2 1 3 1 Syria 1 Turkey 5 1 1 2 1 Afghanistan 2 1 Azerbaijan 3 1 Kurdistan 1 Poland 2 1 Lithuania 1 Yugoslavia 1 Germany 1 1 Russia 4 Rumania 2 Total 29 3 16 3 52 21 6 2 1 1 1 4 2 2 1 was the ‘Yemenite’ PKU haplotype, 6del. For Point Mutations in the PAH Gene haplotypes other than 6del, %2 analysis indi­ Tables 3 and 4 summarize PAH molecular cated significant difference between frequen­ lesions found to date in the Israeli population, cies among Jews and Palestinian Arabs only their haplotype association and ethnic origins.
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