Intraspecific Variation of Brown Rat Rattus norvegicus in Russia by D-Loop mtDNA Data.

For the first time in Russia, the intraspecific structure of the brown rat Rattus norvegicus was studied using the mitochondrial control region (D-loop) as a molecular marker. The mtDNA sequence was determined in brown rats from eight regions of European and Asian Russia. Three rat clades were identified, including one in European Russia and two in Asian Russia. The synanthropic subspecies R. n. norvegicus was found to have two, European and Asian, lineages. The European lineage included haplotypes from central and southern regions of Russia, and the Asian lineage included haplotypes from Eastern Siberia and the Russian Far East. The exoanthropic subspecies R. n. caraco from the Russian Far East formed a separate genetic lineage.

Mutations of the VCORC1 Gene of Resistance to Anticoagulants in Synanthropic Rodents in Urbanized Areas of Russia.

This is the first study to analyze the variability of two exons (the 1st and 3rd) of the VCORC1 gene in Russian populations of mice and rats, namely, 125 Mus musculus and 19 Rattus norvegicus captured in 13 settlements. Previously, it has been shown that a number of mutations in these exons in the countries of Western Europe are associated with resistance to anticoagulants in synanthropic rodents. We did not find such mutations in house mice in Russia. However, in the first exon, two previously unknown mutations were identified that could potentially have such an effect (Lys58Arg and Ser31Trp). In three districts of Moscow, Norway rats were found carrying in the third exon a previously known resistance mutation (Tyr139Ser) in the heterozygous state. The results are discussed in connection with the intensity of the use of anticoagulants in the settlements of Russia and the mutation rate of the VCORC1 gene.

[Variability of Fragments of Nuclear Brca1 Gene, Exon 11, and Mitochondrial Cox1 Gene in House Mice Mus musculus].

To clarify genetic differences between subspecies of the house mouse Mus musculus, their distribution, and hybridization, we first conducted a comparative analysis of variability of nucleotide sequences of fragments of the nuclear gene Brca1, exon 11 (2331 bp), and mitochondrial gene Cox1 (1260 bp) in 40 house mice from West and East Europe, Transcaucasia, Siberia, and Central and South Asia. Brca1 genotypes were divided into five main groups, which differed in a number of fixed substitutions. Genotypes of each group are characteristic for the certain geographical region and the following subspecies: M. m. musculus, M. m. domesticus, M. m. castaneus, and M. m. wagneri together with M. m. gansuensis; a fifth group corresponds to an unidentified subspecies or a distinct genetic form of M. musculus from India (Sikkim State). Besides the homozygous specimens, we revealed mice, which were heterozygous for all diagnostic loci simultaneously; these specimens were determined as hybrid. Hybrid mice were mainly found in the zones of contact of subspecies, but in some cases, quite far from one of the parent subspecies (possibly, due to transportation). In two hybrid mice (from Bakhtiari Province of Iran and Transbaikalia of Russia), unique Brca1 haplotypes were detected. It cannot be ruled out that, at least partly, they may be characteristic of the M. m. bactrianus and M. m. gansuensis subspecies, respectively. Thus, the results of the study showed that the nuclear Brca1 gene is a promising molecular genetic marker for the analysis of variability, differentiation, and hybridization of house mice as well for subspecific identification of M. musculus specimens. Despite more rapid evolution of the Cox1 gene, it is not well suited for discrimination of M. m. musculus, M. m. wagneri, M. m. gansuensis specimens and Transcaucasian representatives of M. m. domesticus due to introgression and long-term maintenance of foreign mitochondrial DNA in populations. However, Cox1 gene analysis (along with the diagnostics of animals by nuclear DNA) may be useful for estimation of population differences in M. m. castaneus and M. m. domesticus subspecies.

First Data on the Contact Zone and Hybridization between the Cryptic Species of Shrews Sorex araneus and S. satunini (Eulipotyphla, Mammalia).

For the first time, based on sequence variation of microsatellite loci and the mtDNA cytb gene fragment, population genetic structure of the common shrew and Caucasian shrew in their contact zone was investigated. It was demonstrated that, although there was no complete reproductive isolation between the species under consideration, the gene flow was considerably limited. These data testify to the established reliable reproductive barriers between the common shrew and Caucasian shrew.

Genetic Differentiation of the Steppe Field Mouse Sylvaemus witherbyi Populations: The Results of the Mitochondrial DNA Control Region Analysis.

The degree of genetic diversity of the steppe field mouse was estimated on the basis of the mtDNA control region variability data. Polymorphism of this mtDNA marker in S. witherbyi was more pronounced than previously assumed. The steppe field mouse population from the northern shore of Lake Manych-Gudilo includes several mitochondrial lines, which may be due to the existence of several migration flows to this area from Southwest Asia.

[Genetic Structure of the Common Shrew Sorex araneus L. 1758 (Mammalia, Lipotyphla) in Continuous and Fragmented Areas].

In this work the genetic variability of the common shrew populations Sorex araneus L. in Eastern Europe was studied via sequencing of the mitochondrial gene cyt b. A total of 82 sequences of the mitochondrial gene cyt b with a length of 953 basepairs were analyzed, including five chromosome races in a continuous area of the species in forest zone and two races in fragmented area in the steppe zone. Phylogeographic subdivision of the common shrew was not expressed, and there was no significant correlation between genetic and geographic distances in continuous areas. We did not acquire convincing evidence of the influence of narrow hybrid zones between chromosome races on the flow of neutral alleles. A significant p-distance (0.69 ± 0.27%) of geographically close populations of the chromosome race Neroosa indicates the formation of the karyotype of this race in the Pliocene or Pleistocene. In our work, the phylogeographic structure was determined more by species area fragmentation than by its karyotypic features.

Phylogenetic relationships of intraspecific forms of the house mouse Mus musculus: Analysis of variability of the control region (D-loop) of mitochondrial DNA.

Analysis of the control region of mitochondrial DNA (mtDNA) or D-loop of 96 house mice (Mus musculus) from Russia, Moldova, Armenia, Azerbaijan, Kazakhstan, and Turkmenistan has been used to reconstruct the phylogenetic relationships and phylogeographic patterns of intraspecific forms. New data on the phylogenetic structure of the house mouse are presented. Three phylogroups can be reliably distinguished in the eastern part of the M. musculus species range, the first one mainly comprising the haplotypes of mice from Transcaucasia (Armenia); the second one, the haplotypes of mice from Kazakhstan; and the third one, the haplotypes of mice from Siberia and some other regions. The morphological subspecies M. m. wagneri and M. m. gansuensis have proved to be genetically heterogeneous and did not form discrete phylogroups in the phylogenetic tree.

[Genetic variation and differentiation of wood mice from the genus Sylvaemus inferred from sequencing of the cytochrome oxidase subunit 1 gene fragment].

To ascertain intra- and interspecific differentiation patterns of some Sylvaemus wood mice species (S. uralensis, S. sylvaticus, S. ponticus, S. flavicollis, and S. fulvipectus), sequence variation of the mitochondrial cytochrome oxidase subunit I gene (COI) fragment (654 bp) was analyzed and the data obtained using several molecular genetic markers were compared. Distinct isolation of all Sylvaemus species (including closely related allopatric S. flavicollis and S. ponticus), as well as of the European and Asian races of pygmy wood mouse S. uralensis at the COI gene was demonstrated. However, genetic differences of the Sylvaemus species were 1.5 times and more higher than the distance (D) between the races of S. uralenciis. This finding provides no ample grounds to treat the latter as the independent species. The only specimen of Pamir-Alay subspecies S. uralensis pallipes examined showed closest relatedness to to the Asian race, although was rather distant from it (D = 0.038). No reliable isolation of the eastern European and southern European chromosomal forms, representing the European race of S. uralensis, as well as of their presumptive hybrids from the outskirts of the city of Sal'sk, Rostov region, at the COI gene was revealed. A hybrid origin of the populations of pygmy wood mouse from the outskirts of the Talapker railway station, Novovarshavsky district, Omsk region, was confirmed. In preliminary studies, based on karyotypic characters, these populations were diagnosed as distant hybrids of the eastern European chromosomal form and the Asian race. In yellow-necked wood mouse S. flavicollis from the territory of Russia and Ukraine, weak differentiation into northern and southern lineages (with mean genetic distance between them of 0.020) was observed. Considerably different relative genetic distances between the races of S. uralensis and the S. flavicollis--S. ponticus species pair, inferred from the mitochondrial cytochrome oxidase and cytochrome b gene data, indicated that the rates of evolution of different mitochondrial genome regions could be very different. It is suggested that transformations of the cytochrome b gene, or at least its part, were irregular in time and/or in different phyletic lineages (i.e., accelerated upon the formation of pygmy wood mouse races, and delayed upon the establishment of S. flavicollis and S. ponticus).

[Revision of the species composition of the wood mice from the genus Sylvaemus from the territory of Rostov oblast using karyological, allozyme and molecular genetic analysis].

Using karyological, allozyme, and molecular genetic analysis, habitation of the four Sylvaemus wood mice species, pygmy wood mouse (S. uralensis), wood mouse (S. sylvaticus), yellow-necked mouse (S. flavicollis), and yellow-bellied mouse (S. fulvipectus) in Rostov oblast was demonstrated. Sylvaemus uralensis was distributed nearly over nearlythe whole territory of the oblast; S. sylvaticus was found in the central and western parts of the oblast on the right bank area of Don River; S. flavicollis inhabited northern and central parts of the right bank area of Don River; S. fulvipectus was found in the southern parts of the oblast, in the left bank area of Don River. Using the chromosome C-banding technique, it was demonstrated that the pygmy wood mice living in Rostov oblast in the right bank areas of Manych River and Don River in its low course, belonged to the eastern European chromosomal form of S. uralensis. The mice from the outskirts of the town of Salsk, the left bank area of Manych River, were probably hybrids between eastern European and southern European chromosomal forms. Based on the mitochondrial DNA cytochrome b gene fragment sequencing and chromosome C-banding, it was suggested that the wood mice inhabiting Rostov oblast belonged to the southern lineage of S. sylvaticus, living on Apennine Peninsula, Balkan Peninsula, and nearly throughout Ukraine.

[Crimean-Congo hemorrhagic fever in Rostov Province: the epidemiological characteristics of an outbreak]. / Krymskaia-Kongo gemorragicheskaia likhoradka v Rostovskoi oblasti: épidemiologicheskie osobennosti vspyshki.

The results of the epidemiological analysis of the outbreak of hemorrhagic fever which was caused by Crimean-Congo hemorrhagic fever virus and occurred during the period of July 3-19, 1999, in the Oblivskaya district of Rostov Province are presented. The specific epidemiological features of the outbreak have been determined. The possible versions of the appearance of the focus of infection and the role of Ixodes ticks in the circulation of the infective agent are discussed.