Chlamydia trachomatis Strains Show Specific Clustering for Men Who Have Sex with Men Compared to Heterosexual Populations in Sweden, the Netherlands, and the United States

High-resolution genotyping of Chlamydia trachomatis improves the characterization of strains infecting different patient groups and sexual networks. In this study, multilocus sequence typing (MLST) and ompA sequence determination were used for an analysis of C. trachomatis strains from 203 men who have sex with men (MSM) from Sweden, the Netherlands, and the United States. The results obtained were compared with data from 153 heterosexual women from Sweden and the Netherlands. The overlap in MLST/ompA profiles between MSM from Sweden and the Netherlands was 68%, while the overlap between heterosexual populations from these countries was only 18%. The distribution of genotypes in MSM from the United States was less similar to that in MSM from the European countries, with 45% and 46% overlaps for MSM in Sweden and the Netherlands, respectively. Minimum-spanning-tree analysis of MLST/ompA sequence types identified two large clusters that contained almost exclusively samples from MSM and comprised 74% of all MSM samples. Three other clusters were predominated by samples from women but also contained MSM specimens. Of 19 detected variants of the MLST target CT144, three variants were highly associated with MSM. Our study supports the hypotheses of both tissue tropism as well as epidemiological network structures as explanations for the linkage between specific genetic variants and sexual orientation

MLVA Subtyping of Genovar E Chlamydia trachomatis Individualizes the Swedish Variant and Anorectal Isolates from Men who Have Sex with Men

This study describes a new multilocus variable number tandem-repeat (VNTR) analysis (MLVA) typing system for the discrimination of Chlamydia trachomatis genovar D to K isolates or specimens. We focused our MLVA scheme on genovar E which predominates in most populations worldwide. This system does not require culture and therefore can be performed directly on DNA extracted from positive clinical specimens. Our method was based on GeneScan analysis of five VNTR loci labelled with fluorescent dyes by multiplex PCR and capillary electrophoresis. This MLVA, called MLVA-5, was applied to a collection of 220 genovar E and 94 non-E genovar C. trachomatis isolates and specimens obtained from 251 patients and resulted in 38 MLVA-5 types. The genetic stability of the MLVA-5 scheme was assessed for results obtained both in vitro by serial passage culturing and in vivo using concomitant and sequential isolates and specimens. All anorectal genovar E isolates from men who have sex with men exhibited the same MLVA-5 type, suggesting clonal spread. In the same way, we confirmed the clonal origin of the Swedish new variant of C. trachomatis. The MLVA-5 assay was compared to three other molecular typing methods, ompA gene sequencing, multilocus sequence typing (MLST) and a previous MLVA method called MLVA-3, on 43 genovar E isolates. The discriminatory index was 0.913 for MLVA-5, 0.860 for MLST and 0.622 for MLVA-3. Among all of these genotyping methods, MLVA-5 displayed the highest discriminatory power and does not require a time-consuming sequencing step. The results indicate that MLVA-5 enables high-resolution molecular epidemiological characterisation of C. trachomatis genovars D to K infections directly from specimens

Negative Regulation of Active Zone Assembly by a Newly Identified SR Protein Kinase

A neuronal serine-arginine protein kinase that localizes to the presynaptic active zone is required for kinase-dependent repression of active zone assembly

Hem-1 Complexes Are Essential for Rac Activation, Actin Polymerization, and Myosin Regulation during Neutrophil Chemotaxis

Migrating cells need to make different actin assemblies at the cell's leading and trailing edges and to maintain physical separation of signals for these assemblies. This asymmetric control of activities represents one important form of cell polarity. There are significant gaps in our understanding of the components involved in generating and maintaining polarity during chemotaxis. Here we characterize a family of complexes (which we term leading edge complexes), scaffolded by hematopoietic protein 1 (Hem-1), that organize the neutrophil's leading edge. The Wiskott-Aldrich syndrome protein family Verprolin-homologous protein (WAVE)2 complex, which mediates activation of actin polymerization by Rac, is only one member of this family. A subset of these leading edge complexes are biochemically separable from the WAVE2 complex and contain a diverse set of potential polarity-regulating proteins. RNA interference–mediated knockdown of Hem-1–containing complexes in neutrophil-like cells: (a) dramatically impairs attractant-induced actin polymerization, polarity, and chemotaxis; (b) substantially weakens Rac activation and phosphatidylinositol-(3,4,5)-tris-phosphate production, disrupting the (phosphatidylinositol-(3,4,5)-tris-phosphate)/Rac/F-actin–mediated feedback circuit that organizes the leading edge; and (c) prevents exclusion of activated myosin from the leading edge, perhaps by misregulating leading edge complexes that contain inhibitors of the Rho-actomyosin pathway. Taken together, these observations show that versatile Hem-1–containing complexes coordinate diverse regulatory signals at the leading edge of polarized neutrophils, including but not confined to those involving WAVE2-dependent actin polymerization

Stroke in Swedish children II: long-term outcome

Aim: To evaluate the long-term outcome of childhood stroke in a population-based cohort of Swedish children. Methods: We followed up children with stroke over 7 years from 2000 to 2006 in a health care region covering one-fifth of the Swedish population. Children aged between 28 days and 18 years, who had arterial ischaemic stroke, cerebral sinus venous stroke or nontraumatic haemorrhagic stroke, were included. The long-term outcome study 1.6-8.6 years later included a clinical investigation, evaluation of school performance, everyday activities and participation and health-related quality of life questionnaires (International Classification of Functioning, Disability and Health, Child Health Questionnaire and Short-Form General Health Survey). Results: Of 51 children, 4 (8%) had died and 85% of the long-term survivors had some acquired impairment: 65% of the children had neurological impairment, and 59% had deficits affecting school activity and participation. The parents experienced the negative effect of the stroke on their child's general health, daily life activities and participation and also on their own family life. Conclusion: Childhood stroke results in serious long-term functional deficits in 85% of survivors affecting their everyday life, the child's performances and the life of the family as a whole.</p

Exploring the Effects of Union-NGO Relationships on Corporate Responsibility: The Case of the Swedish Clean Clothes Campaign

In the current era, governments are playing smaller roles in regulating workers’ rights internationally, and transnational corporations (TNCs), non-governmental organisations (NGOs) involved in the struggle for workers’ rights, and labour/trade unions have started to fill this governance gap. This paper focuses on the least researched of the relationships among these three actors, the union–NGO relationship, by analysing the ways in which it affects definitions of TNC responsibility for workers’ rights at their suppliers’ factories. Based on a qualitative study of the union–NGO relationship in the Swedish garment industry between 1996 and 2005, we propose that there are six main configurations of union–NGO relationships. By linking these configurations to their effects on TNC responsibility, we propose that co-ordination relationships between unions and NGOs, particularly high-commitment co-ordination relationships, are likely to result in a broadening of the definition of TNC responsibility, while conflictual relationships, both high and low commitment, result in a narrowing of the definition of TNC responsibility. The study indicates that co-operation is generally more beneficial for both unions and NGOs than is any form of conflictual relationship, in terms of broadening the definition of TNC responsibility

Multilocus Sequence Typing of Urogenital Chlamydia trachomatis From Patients With Different Degrees of Clinical Symptoms

Background: In the past, contradictory results have been obtained linking Chlamydia trachomatis serovars (ompA gene) to different clinical courses of infection. Methods: A high resolution multilocus sequence typing (MLST) system was used to genotype 6 genetic regions, including ompA, in 70 Dutch urogenital C. trachomatis strains from patients with different degrees of defined clinical symptoms (asymptomatic, symptomatic, and lower abdominal pain), to determine if MLST genotypes correlated with clinical manifestations of infection. Results and conclusions: We identified 46 MLST types, with only a small overlap to Swedish MLST types. This study found no correlation between MLST profiles and symptomatology. To understand the clinical course of infection, future studies should not only consider bacterial factors but also look on the immunogenetics of the hos