Labor market in the UK in digital era: The gender dimension

The article considers gender discrimination in the field of labor relations in the United Kingdom (UK) in the pre-covid period. In the past decades, the Western European countries have made the most significant progress in achieving gender equality in various fields, including labor relations, and became the world leader in this area. However, despite all the efforts of the international community, no country has achieved a full gender equality, and Great Britain is no exception. The authors argue that the British anti-discrimination legislation (before leaving the European Union) was based on international acts and conventions. For a long time, there were acts and laws prohibiting discrimination in the labor market, which seriously hindered the implementation of an effective anti-discrimination policy in the sphere of labor relations. It was not until 2010 that the law on equality was passed to replace all previous laws and regulations and to provide an exhaustive list of criteria for prohibiting discrimination. As a result, Great Britain began to develop a rather strict national anti-discrimination legislation in the field of labor relations. Thus, in the past decades, the UK has been achieving gender equality in the economic sphere at a faster pace than the average European Union country. The study shows a steady decline in the gender wage gap in the UK over the past two decades, which may be considered one of the country’s most significant achievements in fighting gender discrimination in the labor market. However, there is still a number of serious challenges: a relatively low female labor force participation and employment rate, a gender wage gap and income gap, horizontal and vertical segregation, a gender gap in postgraduate education, and a significant gender gap in time spent on family responsibilities. Age discrimination presents a special problem in the sphere of labor relations in Great Britain. In the European Union, the first laws prohibiting age discrimination were adopted only in the 2000s, and in the UK - in 2006. This problem still remains extremely acute for the labor market, since age discrimination in the UK ranks third among the most common grounds for discrimination - after gender and disability

Germline-restricted chromosome (GRC) is widespread among songbirds

An unusual supernumerary chromosome has been reported for two related avian species, the zebra and Bengalese finches. This large, germline-restricted chromosome (GRC) is eliminated from somatic cells and spermatids and transmitted via oocytes only. Its origin, distribution among avian lineages, and function were mostly unknown so far. Using immunolocalization of key meiotic proteins, we found that GRCs of varying size and genetic content are present in all 16 songbird species investigated and absent from germline genomes of all eight examined bird species from other avian orders. Results of fluorescent in situ hybridization of microdissected GRC probes and their sequencing indicate that GRCs show little homology between songbird species and contain a variety of repetitive elements and unique sequences with paralogs in the somatic genome. Our data suggest that the GRC evolved in the common ancestor of all songbirds and underwent significant changes in the extant descendant lineages

Comparison of American mink embryonic stem and induced pluripotent stem cell transcriptomes

BACKGROUND: Recently fibroblasts of many mammalian species have been reprogrammed to pluripotent state using overexpression of several transcription factors. This technology allows production of induced pluripotent stem (iPS) cells with properties similar to embryonic stem (ES) cells. The completeness of reprogramming process is well studied in such species as mouse and human but there is not enough data on other species. We produced American mink (Neovison vison) ES and iPS cells and compared these cells using transcriptome analysis. RESULTS: We report the generation of 10 mink ES and 22 iPS cell lines. The majority of the analyzed cell lines had normal diploid chromosome number. The only ES cell line with XX chromosome set had both X-chromosomes in active state that is characteristic of pluripotent cells. The pluripotency of ES and iPS cell lines was confirmed by formation of teratomas with cell types representing all three germ layers. Transcriptome analysis of mink embryonic fibroblasts (EF), two ES and two iPS cell lines allowed us to identify 11831 assembled contigs which were annotated. These led to a number of 6891 unique genes. Of these 3201 were differentially expressed between mink EF and ES cells. We analyzed expression levels of these genes in iPS cell lines. This allowed us to show that 80% of genes were correctly reprogrammed in iPS cells, whereas approximately 6% had an intermediate expression pattern, about 7% were not reprogrammed and about 5% had a "novel" expression pattern. We observed expression of pluripotency marker genes such as Oct4, Sox2 and Rex1 in ES and iPS cell lines with notable exception of Nanog. CONCLUSIONS: We had produced and characterized American mink ES and iPS cells. These cells were pluripotent by a number of criteria and iPS cells exhibited effective reprogramming. Interestingly, we had showed lack of Nanog expression and consider it as a species-specific feature

Cryopreservation of epididymal semen of domestic cat

Domestic cat (Felis silvestris catus) is used as a model species for developing effective methods of wild felids’ semen cryopreservation. The present study represents a comparison of domestic cat semen cryopreservation with two commercially available cryoprotectant agents (CPAs): CaniPlus Freeze (CPF) and SpermFreeze (SF). Semen was collected from the caudal epididymises of adult males and frozen with CPF and SF, correspondingly. The viability of frozen-thawed spermatozoa was evaluated by VitalScreen kit, staining with hematoxylin and eosin was performed for analysis of the spermatozoa morphology; both analyses were combined with the light microscopy. The viability rate of the frozenthawed semen cryopreserved with CPF and SF did not differ: 32.3±4.4 % for CPF and 43.3±4.0 % for SF. Total percentage of morphologically normal spermatozoa after freezing and thawing domestic cat semen was 26.0±2.3 % for CPF and 23.9±1.9 % for SF. In both cases, there were no differences from non-frozen semen, in the latter group the total percentage of spermatozoa with normal morphology was 29.0±4.1 %. The most frequent anomalies were the anomalies of tail, and the rarest anomalies were head defects. The percentages of spermatozoa with anomalies of the head, mid piece, tail and combined did not differ in these three groups. Taken together these results suggest that both CPAs are suitable for the purpose of domestic cat semen freezing and cryopreservation, although CPF was designed for Canidae semen cryopreservation and SF was developed for human semen freezing and so far was used exclusively in reproductive medicine. It might be concluded that these two commercially available cryoprotectant media are applicable for the purposes of domestic cat breeds’ semen cryopreservation

Genome resource banking in the family Felidae

Many of the extant Felidae species are endangered or vulnerable. Others being not endangered as a whole species contain endangered subspecies. Only a very few cat species, besides domestic cats, are not in the risk group. Cryopreservation of embryos and gametes is a modern approach for ex situ mammalian genetic resources conservation. Freezing of semen has been successfully applied to the domestic cat and to more than 25 wild members of this family. However, embryos/oocytes cryopreservation was successful for only a small number of felids. Domestic cat and four wild Felidae species produced offspring after cryopreservation and subsequent embryo transfer. Regarding freezing of oocytes, so far different cryopreservation methods are still being experimentally tried exclusively for domestic cat. Genome Resource Bank (GRB) containing frozen semen of Amur leopard cat, bobcat and Eurasian lynx was established at the Institute of Cytology and Genetics, Novosibirsk. As a result of this project, original methods of feline semen freezing have been developed; embryos of domestic cat have been successfully frozen as well. Approaches to freeze domestic cat’s oocytes have also been tried. During this work, we combined biological and physical methods. In particular, the process of freezing embryos and oocytes was monitored with Raman spectroscopy. Different methods of frozen-thawed spermatozoa and embryonic viability testing were used in this study, including vital staining and subsequent fluorescent and light microscopy, and heterologous in vitro fertilization

Comparison of in vivo and in vitro preimplantation embryo development in OXYS and WAG rats

OXYS rats are the model of precocious senescence. Numerous studies addressed physiology and behavior in rats of this strain during a postnatal period of their life, however, preimplantation development in OXYS rats has not yet been investigated. This study is addressing preimplantation embryonic development in OXYS rats both in vivo and in vitro. Rats of the WAG strain were used as controls. For studying the in vivo development, the embryos were collected from OXYS and WAG rats on day 5 post coitum, the stages of embryo development were estimated, the percentage of embryos at blastocyst stage and the cell numbers in these blastocysts were counted. In a special experiment, for studying in vitro development, the embryos were collected from both rat strains on day 4 post coitum and were cultured in vitro in P1 medium for 48 hours with or without supplementation with IGF-1 (200 ng/mL). Thereafter the percentage of embryos at blastocyst stage and the cell numbers in these blastocysts were counted in the same manner as for the in vivo experiment. This study reports that in vivo derived blastocysts of OXYS rats contain fewer cells on day 5 of their development than in vivo derived blastocysts of WAG rats. In vitro culture of the early preimplantation embryos in P1 medium mitigated the difference in the rate of embryo development between these two strains, the addition of IGF-1 into culture medium exerts neither negative nor positive effect on the rate of in vitro embryo development in rats of both strains

Applying reproductive technologies and genome resource banking to laboratory animals

The Genome Resource Bank (GRB) is a repository of frozen biological material, including semen and embryos. Cryo­banking is used in combination with modern reproductive technologies such as rederivation, in vitro culture and embryo transfer. Thirteen mouse and rat strains have been re-derived and 32 are kept frozen in the cryostorage at the Institute of Cytology and Genetics, Novosibirsk. Some other laboratory animal species have been cryopreserved as well. Embryos of two hamster species (Djungarian and Campbell’s) in the genus Phodopus were cryopreserved and the viability of thawed embryos was proved by their successful development in vitro and in vivo (by transfer to a recipient). A positive effect of the granulocyte-macrophage colony-stimulating factor (GM-CSF) was demonstrated with both these Phodopus species. Furthermore, semen of Djungarian (Phodopus sungorus) and Campbell’s (Phodopus campbelli) hamsters, domestic cat (Felis catus), amur cat (Prionailurus bengalensis euptilurus) and bobcat (Lynx rufus) was frozen and cryopreserved. Double staining by SYBR Green/PI and subsequent confocal microscopy demonstrated that more than 40 % of amur cat semen retained viability after cryopreservation. This is the world’s first reported successful freezing of semen of this wild felid (Prionailurus bengalensis euptilurus). This article reviews the results and discusses prospects of using reproductive technologies for conservation of laboratory species

Evaluation of human postural balance in quiet standing by direct measurement of human body center of mass acceleration

Present article deals with the evaluation of human postural balance in quiet standing by the direct measuring of center of mass acceleration. Displacements of subjects’ center of mass were determined and trajectories in anterior-posterior-medial-lateral plane were obtained. Comparison of parameters between subjects with stroke and healthy subjects was performed and measurements revealed higher sway amplitudes of subjects with stroke