Diversity of Mitochondrial DNA Haplogroups in Ethnic Populations of the Volgaðural Region M
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Molecular Biology, Vol. 36, No. 6, 2002, pp. 802–812. Translated from Molekulyarnaya Biologiya, Vol. 36, No. 6, 2002, pp. 990–1001. Original Russian Text Copyright © 2002 by Bermisheva, Tambets, Villems, Khusnutdinova. GENOMICS. TRANSCRIPTOMICS. PROTEOMICS UDC 575.174.599.9 Diversity of Mitochondrial DNA Haplogroups in Ethnic Populations of the Volga–Ural Region M. A. Bermisheva1, K. Tambets2, R. Villems2, and E. K. Khusnutdinova1 1 Institute of Biochemistry and Genetics, Ufa Research Center, Russian Academy of Sciences, Ufa, 450054 Russia; E-mail: [email protected] 2 Estonian Biological Center, Tartu University, Tartu, Estonia Received February 28, 2002 Abstract—The mtDNA polymorphism was analyzed in eight ethnic groups (N = 979) of the Volga–Ural region. Most mtDNA variants belonged to haplogroups H, U, T, J, W, I, R, and N1 characteristic of West Eurasian pop- ulations. The most frequent were haplogroups H (12–42%) and U (18–44%). East Eurasian mtDNA types (A, B, Y, F, M, N9) were also observed. Genetic diversity was higher in Turkic than in Finno-Ugric populations. The frequency of mtDNA types characteristic of Siberian and Central Asian populations substantially increased in the ethnic groups living closer to the Urals, a boundary between Europe and Asia. Geographic distances, rather than linguistic barriers, were assumed to play the major role in distribution of mtDNA types in the Volga– Ural region. Thus, as concerns the maternal lineage, the Finno-Ugric populations of the region proved to be more similar to their Turkic neighbors rather than to linguistically related Balto-Finnish ethnic groups. Key words: mitochondrial DNA, haplotyping, ethnogenomics, ethnic groups of the Volga–Ural region INTRODUCTION Haplogroups A, B, C, and D are the first specific Asian haplogroups that have been found in native Mitochondrial (mt) DNA and the Y chromosome Americans [9, 10]. Haplogoups C and D have a com- occupy a specific place among highly polymorphic mon ancestor in cluster M, while haplogroups A and genetic systems. Owing to the maternal inheritance, B originate from cluster N. Phylogenetically, various absence of recombination, and high polymorphism, mtDNA variants specific for Eastern Eurasia may be mtDNA can be employed as a major tool in evolution- classed into several macroclusters (Fig. 1). Macro- ary, populational, and medical genetic studies [1, 2]. clusters M and N originate from African macrocluster The variation of human mtDNA has been extensively L3, the consensus nucleotide sequence of which is studied in the 1980s and 1990s. Race- and population- considered as a common ancestor (MRCA) of all non- specific mtDNA types and mutations have been African mtDNA lineages. Haplogroups of cluster M described and used to define individual haplogroups are frequent and diverse in Asia [10] and rare in [2, 3]. A modern classification of European mtDNA Europe, which supports the hypothesis that Asia was variants is based on the combined data [4–6] on poly- first populated as a result of migration from Eastern morphisms of the control (hypervariable segments I Africa [11]. This cluster harbors about half mtDNA and II, HVSI and HVSII) [7] and coding [8] regions of variants of the indigenous population of Eastern Eur- mtDNA. The European mtDNA clusters are best orga- asia [2], and consists of several haplogroups, includ- nized owing to detailed analysis of the mtDNA varia- ing C, Z, D, G, E, M7, M8, M9, M10, etc. (Fig. 1). Supercluster N includes haplogroups A, Y, B, and F in tion in European populations. More than 90% of Asia. Haplogroup A has an ancestral nucleotide (T) in European mtDNAs belong to nine haplogroups position 16,223, whereas haplogroups B and F, along (Fig. 1), which are highly specific for Western Eurasia with most European lineages, originate from cluster R. [4, 6]. These clusters are all thought to originate from one supercluster, L3n (N). In addition, supercluster Analysis of the diversity of European mtDNA vari- L3n includes several haplogroups (A, B, F, and Y) ants has been restricted to Western and Central Europe restricted to East Eurasian populations. Five haplo- so far. In this work, we characterize the mtDNA hap- groups (H, V, J, T, and U) form cluster R, which is logroup diversity in eight East European (Volga–Ural) characterized by substitutions in mtDNA nucleotide ethnic groups representing two, Altaian and Ural, positions 12,705 and 16,223 [4]. large linguistic families. 0026-8933/02/3606-0802 $27.00 © 2002 MAIK “Nauka /Interperiodica” MITOCHONDRIAL DNA HAPLOGROUPS 803 EXPERIMENTAL D C Material for population genetic analysis was collected during expeditions from 1989 to 2001. Z Blood of informed adults was obtained after medical M examination. In total, we tested 979 DNA specimens E of the indigenous populations of the Volga–Ural Root region, including 221 Bashkirs (Trans-Ural, South- of the tree western, Northeastern, and Gaininsk Bashkirs) from L3 G the Beloretskii, Sterlibashevskii, and Ilishevskii Dis- tricts of Bashkortostan and the Perm Region; 228 A Tatars from the Al’met’evskii and Elabuzhskii Dis- I tricts of Tatarstan; 55 Chuvash from the Morgaushskii N Y District of Chuvashia; 102 Mordvinians from the X Staro-Shaiginskii District of Mordovia; 136 Mari in Eastern Eurasia B from the Zvenigovskii District of Marii El; W 101 Udmurts from the Malo-Purginskii District of in W occurring mostly R Haplogroups occurring mostly Haplogroups U Udmurtia and the Tatyshlinskii District of Bashkor- K F tostan; 62 Komi-Zyryans from the Sysol’skii District estern Eurasia of the Komi Republic; and 74 Komi-Permyaks from J the Komi-Permyak Autonomous District. T H V Genomic DNA was isolated from 10 ml of periph- eral blood by phenol–chloroform extraction. Frag- ment 16,024–16,400 of mtDNA HVSI was sequenced in a Perkin-Elmer ABI 377 DNA sequencer with a DYEnamic ET terminator cycle sequencing premix kit (Amersham Pharmacia Biotech). Fig. 1. Phylogenetic tree of mtDNA clusters found in Eur- asian populations. Haplogroups were identified by mtDNA RFLPs, including 73 (73GA) –Alw44I, 663 (663AG) +HaeIII, 1715 (1719GA) –DdeI, 4577 (4580GA) –NlaIII, 4643 RESULTS AND DISCUSSION (4646TC) +RsaI, 4830 (4833AG) +HaeII, 5176 (5178CA) –AluI, 5416 (5417 GA) +TasI, 5656 The indigenous population of the Volga–Ural (5656AG) +NheI, 7025 (7028CT) –AluI, 7598 region is ethnically, historically, and culturally heter- (7600GA) –HhaI, 8249 (8251CT) +AvaII, 8994 ogeneous. Ethnic groups of the region belong to dif- (8994GA) –HaeIII, 9052 (9055GA) –HaeII, 10,032 ferent language groups, including the Perm (Komi- (10,034TC) +AluI, 10,394 (10,398AG) +DdeI, 10,397 Zyryans, Komi-Permyaks, Udmurts) and Volga-Finn- (10,400CT) +AluI, 12,308 (12,308AG) +HinfI, ish (Mordvinians, Mari) branches of the Ural lan- 12,406 (12,406GA) –HincII, 12,704 (12,705CT) guage family and the Turkic branch of the Altaian lan- −MboII, 13,262 (13,263AG) +AluI, 13,366 guage family (Bashkirs, Tatars, Chuvash). Anthropo- (13,368GA) +BamHI, 13,704 (13,708GA) –BstI, logically, these ethnic groups are Caucasian and have 14,068 (14,070AG) +TaqI, 14,766 (14,766TC) +MseI, a varying Mongoloid component [12]. The region and 15,904 (15,904CT) +MseI. Transition or transver- includes various geographic zones, from taiga, tundra sion resulting in a gain or loss of a restriction site is (Komi-Zyryans) and Central Volga plains (Mordvin- indicated in parentheses. Mutations in mtDNA were ians, Mari, Chuvash, Tatars) to the Southern Urals and identified according to the Cambridge reference Trans-Ural steppe (Bashkirs) (Fig. 2). sequence (CRS) [13]. To establish the phylogenetic relationships among haplotypes, median networks We sequenced the 377-bp region (16,024–16,400) were constructed with the combined data on polymor- of mtDNA HVSI in 979 people of the eight ethnic phisms of the mtDNA coding region and HVSI for the groups of the Volga–Ural region. Haplogroups were total sample of the Volga–Ural region. identified by RFLP analysis of 26 polymorphic sites of the mtDNA coding region and analysis of the dele- Genetic heterogeneity was calculated as tion from a region between the COII and tRNALys genes. Genetic heterogeneity was relatively low (0.96) 2 H = (1 – ∑xi )N/(N – 1), in Komi-Zyryans and Udmurts, and high (0.99) in Bashkirs. Mean heterogeneity of the Turkic ethnic where xi is the frequency of an mtDNA haplotype in a groups (0.98) was higher than in the Finno-Ugric eth- population and N is the sample size [14]. nic groups (0.96). MOLECULAR BIOLOGY Vol. 36 No. 6 2002 804 BERMISHEVA et al. VII 7.1 IV VIII 3.2 8.1 III 4.1 V 5.1 The Urals 5.2 3.1 VI 2.1 IX 2.2 9.1 II 6.1 1.5 1.3 1.6 1.4 I 1.2 1.1 Fig. 2. Geographic regions occupied by (1.1) Trans-Ural, (1.2) Southwestern, (1.3) Northwestern, and (1.4) Northeastern Bashkirs and (1.5) Udmurts of (I) Bashkortostan; (2.1) Kazan and (2.2) Mishari Tatars of (II) Tatarstan; (3.1) Low and (3.2) Mid-Low Chu- vash of (III) Chuvashia; (4.1) Meadow Mari of (IV) Marii El; (5.1) Erzya and (5.2) Moksha Mordvinians of (V) Mordovia; (6.1) Southern Udmurts of (VI) Udmurtia; (7.1) Komi-Zyryans of (VII) the Komi Republic; and (8.1) Komi-Permyak of (VIII) the Komi-Permyak Autonomous District. Haplogroup-determining HVSI motifs found in the This cluster had a stellate phylogenetic tree with the Volga–Ural populations are shown in Table 1. On evi- center occupied by the Cambridge sequence [13], dence of cluster analysis, most mtDNA types were which represents the mtDNA type most common in assigned to haplogroups specific for West Eurasian Europe [4, 5]. populations (Table 2). Haplogroup H has a sister haplogroup V.