POPULATIONS OF THE MAJOR CARRIER RHOMBOMYS OPIMUS, VECTORS OF XENOPSYLLA FLEAS AND THE CAUSATIVE AGENT OF YERSINIA PESTIS IN THE CENTRAL ASIAN DESERT NATURAL FOCUS OF PLAGUE
Ключевые слова:
plague, natural focus, Yersinia Pestis, carrier, Rhombomys Opimus, vector, Xenopsylla.Аннотация
In the Central Asia desert natural focus of plague, the major carrier of the Yersinia pestis agent is the
great gerbil Rhombomys opimus, and its vectors include fleas of the Xenopsylla genus. Phenotypical and genotypical
properties of the R. opimus populations, Xenopsylla fleas and Yersinia pestis strains have been studied in the Central
Asia desert natural focus of plague. Phenotypic distinctions and population discreteness have been identified in R.
opimus on the cytochrome b gene of the mitochondrial genome from three autonomous plague foci: Pre-Balkhash,
Betpakdala and Pre-Ustyurt. Phenotypic distinctions have been found in Xenopsylla fleas in the Central Asia desert
natural focus of plague, and the genotype of X. gerbilli minax fleas on the Cox2 gene of the mitochondrial DNA;
these had been captured in the Betpakdala autonomous focus. The repertoire diversity in phenotypical properties of
Y. pestis strains from different natural foci of plague has been demonstrated, and population discreteness of Y. pestis
strains has been determined using the next-generation sequencing method for single nucleotide polymorphism genes.
Results of the study suggest that geographical and environmental isolation and natural selection have led to
heterogeneity in the three populations of the great gerbil, vector fleas and Y. pestis.
