Phylogenetic analysis of variants of the Puumala virus (Hantaviridae: Orthohantavirus) circulating in the Saratov region.

The objective is to determine the complete nucleotide sequence and conduct a phylogenetic analysis of genome variants of the Puumala virus isolated in the Saratov region. MATERIALS AND METHODS: The samples for the study were field material collected in the Gagarinsky (formerly Saratovsky), Engelssky, Novoburassky and Khvalynsky districts of the Saratov region in the period from 2019 to 2022. To specifically enrich the Puumala virus genome in the samples, were used PCR and developed a specific primer panel. Next, the resulting PCR products were sequenced and the fragments were assembled into one sequence for each segment of the virus genome. To construct phylogenetic trees, the maximum parsimony algorithm was used. RESULTS: Genetic variants of the Puumala virus isolated in the Saratov region have a high degree of genome similarity to each other, which indicates their unity of origin. According to phylogenetic analysis, they all form a separate branch in the cluster formed by hantaviruses from other subjects of the Volga Federal District. The virus variants from the Republics of Udmurtia and Tatarstan, as well as from the Samara and Ulyanovsk regions, are closest to the samples from the Saratov region. CONCLUSION: The data obtained show the presence of a pronounced territorial confinement of strains to certain regions or areas that are the natural biotopes of their carriers. This makes it possible to fairly accurately determine the territory of possible infection of patients and/or the circulation of carriers of these virus variants based on the sequence of individual segments of their genome.

[Obstructive sleep apnea syndrome in children as a risk of cardiovascular pathology development].

OBJECTIVE: Our aim was to examine the predictors of cardiovascular disorders in children affected by obstructive sleep apnea syndrome (OSAS) based on the results of polysomnography and continuous monitoring of blood glycose. METHODS: Before the examination, parents filled in questionnaires concerning their children sleep quality. The procedure was followed by the study of the sleep by means of polysomnography (Embla s 7000, USA). A system of continuous monitoring of blood glucose was applied (Guardianreal-time, Medtronicminimed, USA) by means of which a glycemic profile tissue fluid was studied. RESULTS: A night sleep research of 120 children aged 3-16 y.o. is presented. There were 4 groups depending on the pathology: diseases of the nervous system (n = 31), ENT-pathology (n = 18), bronchial asthma (n = 24) and overweight and obesity (n = 34). The comparison group consisted of 13 apparently healthy children. The study has shown that the parents of every second child with sleep disorders did not know about the fact. The 60 % of the patients with high body mass index (BMI) had a snore, which was significantly higher the in children with normal body mass index--35% (p = 0.012). The index of apnea-hypopnea (AHI) was higher in the patients with ENT-pathology 17 times (p < 0.001) and the patients with obesity 7 times (p < 0.001) in comparison to the comparison group. In the analysis of the overall sample (n = 120) was obtained significant negative correlation with heart rate variability and heart rate (r = 0.405; p < 0.001). It is also shown that among 14 investigated children with OSAS only 8 had episodes of hypoglycemia (less than 3.3 mmol/l) during night sleep. All of them were with a high body mass index and with above average stature (>1sd). CONCLUSION: Children with ENT-pathology and with high high body mass index have high risk of cardio-vascular diseases. Children with above average stature and with increased body mass index affected by OSAS have additional backgrounds for cardiovascular diseases develop- ment as a result of the latent periods of hypoglycemia at night.

[Proteomic methods of protein separation and analysis].

The review briefly presents principles and stages of execution of such highly effective methods of protein separation as capillary, 2D gel-electrophoresis, liquid chromatography, the possibility of their successful combination with tandem mass-spectrometry and application in various fields of proteomics. The main problems of proteomic analysis as well as ways of solving by using mass-spectrometry are examined. 2 main approaches during protein identification are described in the review, characteristics and possibilities of various top-down and bottom-up proteomic analytical programs are provided.

[Mass spectrometry in medicine and biotechnology].

History of development and improvement of tandem mass spectrometry, possibilities of its application at the contemporary stage in various fields of medicine and biotechnology including production of novel medicinal preparations, identification of biologically active substances, pathogenic microorganisms and causative agents of especially dangerous infections is given.

[Infantile cerebral paralysis: modern approach to diagnosis and correction of hearing problems].

The article describes clinical forms of infantile cerebral paralysis, provides the results of examination of the acoustic function in infants with introduction of modern techniques (otoacoustic emission, acoustic impedance technique, acoustic evolved potentials).

[Methodology of determining Yersinia pestis antigens using dot-immunologic analysis]. / Metodika opredeleniia antigenov chumnogo mikroba s pomoshch'iu dot-immunologicheskogo analiza.

The technique of dot-immunoassay on nitrocellulose filters is described for the detection of the vital infection (VI) agents. The results are read visually (qualitatively) and instrumentally (quantitatively). The method is highly sensitive (3.2 +/- 0.8 ng/ml of fraction I) and specific, cost-effective, simple, and available for laboratories engaged in VI diagnosis.