B Chromosomes in Grasshoppers: Different Origins and Pathways to the Modern Bs

B chromosomes (Bs) were described in most taxa of eukaryotes and in around 11.9% of studied Orthopteran species. In some grasshopper species, their evolution has led to many B chromosome morphotypes. We studied the Bs in nine species (Nocaracris tardus, Nocaracris cyanipes, Aeropus sibiricus, Chorthippus jacobsoni, Chorthippus apricarius, Bryodema gebleri, Asiotmethis heptapotamicus songoricus, Podisma sapporensis, and Eyprepocnemis plorans), analyzing their possible origin and further development. The studied Bs consisted of C-positive or C-positive and C-negative regions. Analyzing new data and considering current hypotheses, we suggest that Bs in grasshoppers could arise through different mechanisms and from different chromosomes of the main set. We gave our special attention to the Bs with C-negative regions and suggest a new hypothesis of B chromosome formation from large or medium autosomes. This hypothesis includes dissemination of repetitive sequences and development of intercalary heterochromatic blocks in euchromatic chromosome arm followed by deletion of euchromatic regions located between them. The hypothesis is based on the findings of the Eyprepocnemis plorans specimens with autosome containing numerous intercalary repeat clusters, analysis of C-positive Bs in Eyprepocnemis plorans and Podisma sapporensis containing intercalary and terminal C-negative regions, and development of heterochromatic neo-Y chromosome in some Pamphagidae grasshoppers

Особенности клинической манифестации субкомпенсированного дисбактериоза кишечника кошек при оценке эффективности его коррекции

Formation and reproduction of gut microbiome begins at birth, while change in its composition depends mainly on various genetic, nutritional and environmental factors. The article considers the features of clinical manifestation of subcompensated intestinal dysbiosis in cats in assessing the effectiveness of its treatment. The studies were carried out on the basis of Department of Veterinary Medicine, RUDN University, and the clinical work was conducted at private veterinary clinics: ‘Avettura’, ‘Epiona’, ‘In the World with Animals’. Cats were selected for the experiment as they arrived at the initial appointment at veterinary clinics. The diagnosis of suspected intestinal dysbacteriosis was made considering anamnesis, clinical examination, and microbiological tests. The severity of intestinal dysbacteriosis was assessed on the results of clinical and laboratory studies. During the research, clinical and diagnostic approaches for subcompensated intestinal dysbacteriosis in cats were improved. Furthermore, effective ways of its treatment were developed. For subcompensated intestinal dysbacteriosis, administration of ‘Lactobifadol’ probiotic, ‘Vetelakt’ prebiotic and ‘Azoksivet’ immunomodulator showed the greatest therapeutic effect, which led to an overall clinical improvement in 5.50 days. Therapeutic efficacy of B 3 regimen was also clearly evidenced by the positive changes in intestinal microbiota and hematological blood parameters during the pharmacorrection. Improvement of clinical diagnostic approaches, prognosis of intestinal dysbiosis of varying severity and treatment effectiveness in cats require will allow to study intestinal dysbiotic disorders in other animal speciesФормирование и размножение микробиома кишечника начинается с рождения, в то время как изменение его состава зависит главным образом от различных генетических, пищевых и экологических факторов. Приведены особенности клинической манифестации субкомпенсированного дисбактериоза кишечника кошек при оценке эффективности его коррекции. Исследования проведены на базе департамента ветеринарной медицины Российского университета дружбы народов, а клиническая часть работы выполнена на базе частных клиник ветеринарной медицины: «Аветтура», «Эпиона», «В мире с животными». Кошек в эксперимент подбирали по мере их поступления на первичный прием в ветклиники. Диагноз при подозрении на дисбактериоз кишечника ставили комплексно с учетом данных анамнеза, клинического осмотра, а также микробиологических исследований. Оценку степени тяжести дисбактериоза кишечника осуществляли на основании проведенных клинико-лабораторных исследований. В ходе исследования усовершенствованы клинико-диагностические подходы при субкомпенсированном дисбактериозе кишечника у кошек, а на основании этого разработаны эффективные пути его коррекции. Показано, что при субкомпенсированном дисбактериозе кишечника назначение пробиотика «Лактобифадола» в комплексе с пребиотиком «Ветелакт» и иммуномодулятором «Азоксивет» показывает наибольший терапевтический эффект, что приводит к общему клиническому улучшению уже на 5,5 сутки. О терапевтической эффективности схемы В3 наглядно свидетельствует также позитивная динамика содержимого микробиоты кишечника и гематологических показателей крови в процессе проведения фармакокоррекции. Совершенствование клинико-диагностических подходов и прогнозирование при дисбактериозе кишечника у кошек различной степени тяжести, а также оценка эффективности его коррекции создают предпосылки для дальнейшего изучения дисбиотических нарушений кишечного тракта у других видов животных

Origin and Evolution of the Neo-Sex Chromosomes in Pamphagidae Grasshoppers through Chromosome Fusion and Following Heteromorphization

In most phylogenetic lineages, the evolution of sex chromosomes is accompanied by their heteromorphization and degradation of one of them. The neo-sex chromosomes are useful model for studying early stages of these processes. Recently two lineages of the neo-sex chromosomes on different stages of heteromorphization was discovered in Pamphagidae family. The neo-sex chromosome heteromorphization was analyzed by generation of DNA probes derived from the neo-Xs and neo-Ys followed with chromosome painting in nineteen species of Pamphagidae family. The homologous regions of the neo-sex chromosomes were determined in closely related species with the painting procedure and image analysis with application of the Visualization of the Specific Signal in Silico software package. Results of these analyses and distribution of C-positive regions in the neo-sex chromosomes revealed details of the heteromorphization of the neo-sex chromosomes in species from both phylogenetic lineages of Pamphagidae grasshoppers. The hypothetical mechanism of the neo-Y degradation was suggested. It includes expansion of different repeats from the proximal neo-Y chromosome region by inversions, spreading them towards distal region. Amplification of these repeats leads to formation of C-positive regions and elimination of the C-negative regions located between them

Fecal Microbiota Analysis in Cats with Intestinal Dysbiosis of Varying Severity

Recent studies have shown that the gut microbiota plays an important role in the pathogenesis of gastrointestinal diseases in various animal species. There are only limited data on the microbiome in cats with varying grades of dysbiosis. The purpose of the study was a detailed analysis of the quantitative and qualitative fecal microbiota spectrum in cats with intestinal dysbiosis of varying severity. The data obtained indicate that, depending on the dysbiosis severity in cats, the intestinal microbiome landscape changes significantly. It has been established that, depending on the dysbiosis severity, there is a shift in the balance between the Gram-positive and Gram-negative bacterial pools and in the nature of the isolation of specific bacteria forms, in the amount of obligate microbiota isolation, as well as individual facultative strains. When analyzing the serotyping of E. coli cultures isolated at various grades of intestinal dysbiosis severity, differences were found both in the isolation amount of various serotypes from one animal and in the prevalence of certain serotypes for each disease severity. A retrospective analysis of the fecal microbiota sensitivity in cats with dysbiosis to antibacterial drugs showed that, depending on the disease severity, the number of isolates sensitive to antibiotics increases significantly