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1.
Int Nurs Rev ; 2024 Jan 10.
Article En | MEDLINE | ID: mdl-38197742

AIM: To identify current key areas for nursing research in Switzerland, we revised the Swiss Research Agenda for Nursing (SRAN) initially published in 2008. BACKGROUND: By developing a research agenda, nursing researchers internationally prioritize and cluster relevant topics within the research community. The process should be collaborative and systematic to provide credible information for decisionmakers in health care research, policy, and practice. SOURCES OF EVIDENCE: After a participative, systematic, and critical evaluation within and outside of the Swiss Association for Nursing Science, the updated SRAN 2019-2029 defines four research priorities (new models of care, nursing care interventions, work and care environment, and quality of care and patient safety) and four transversal themes (organization of research, research methodologies, research in health care policy and public health perspectives). CONCLUSION: Adding to other national nursing research agendas, the categories are organized in a framework of key research priorities and transversal themes. They relate to the importance of global and local foci of research as well as challenges in health care services and policy systems. The agenda is an important prerequisite for enhancing the influence of nursing research in Switzerland and provides guidance for the next decade. IMPLICATIONS FOR NURSING PRACTICE: The revised agenda ensures that research projects target key knowledge gaps and the discipline's core questions in respective countries. IMPLICATIONS FOR HEALTH POLICY: Nursing research should inform and influence health policy on all institutional and political levels. Therefore, the integration of public health perspectives in research is one of the most important new aspects of SRAN 2019-2029.

2.
Pflege ; 36(6): 341-348, 2023.
Article De | MEDLINE | ID: mdl-37840265

Pilot study of Experience Focused Counselling by nurses with people who hear voices: Evaluation of the implementation of the study protocol Abstract: Background: Hearing voices and the treatment and support of people who hear voices and are distressed by the experience are defined differently in psychiatry. In contrast to the medical approach to define and treat voices as symptoms of a disease, the EFC counselling approach developed with voice-hearers focuses on non-pathologizing acceptance and a constructive relationship to voices. Mental health nurses with their focus on everyday life are predestined for the dissemination and application of alternative therapeutic approaches in practice. Aim: The aim was to evaluate the study protocol as part of a pilot study regarding its suitability for a larger trial. Method: The multi centre pilot study had a single-blind randomised controlled design. The intervention consisted of EFC counselling by nurses with people who hear voices. The control group received Treatment As Usual (TAU). The suitability of the study design was evaluated in terms of recruitment, burden on study participants, suitability of assessment tools, the application of EFC counselling and the use of study nurses. Results: As planned 21 participants could be included in the study within fifteen months across the two study sites. Overall, the participants rated the study as not very burdensome and the intervention as helpful. The application of EFC by the nurses as well as the use of study nurses was assessed as good and suitable respectively. Discussion: The evaluation of the study protocol shows that with minor adjustments it is suitable for conducting a larger study.


Counseling , Hallucinations , Humans , Pilot Projects , Single-Blind Method , Counseling/methods , Hallucinations/psychology , Hallucinations/therapy , Hearing , Randomized Controlled Trials as Topic , Multicenter Studies as Topic
4.
Int J Ment Health Nurs ; 32(1): 314-322, 2023 Feb.
Article En | MEDLINE | ID: mdl-36330563

Personal recovery is important for mental health services and service users; moreover, valid and reliable assessment instruments are necessary for measuring personal recovery. Therefore, this study aimed to evaluate the unidimensional factor structure of the German version of the Questionnaire about the Process of Recovery. The study was conducted using a cross-sectional design with a convenience sample. The questionnaire was completed by 200 patients of outpatient services of two psychiatric hospitals in Switzerland. A confirmatory factor analysis was conducted to validate the unidimensional factor structure of the German version of the Questionnaire about the Process of Recovery. Cronbach's alpha was calculated to assess the internal consistency. The results showed an overall acceptable model fit (χ2  = 134.188, df = 90, P = 0.002; RMSEA = 0.050, 90% CI: 0.031-0.067; CFI = 0.937; TLI = 0.927) and excellent internal consistency (Cronbach's α = 0.91). These results are consistent with those of studies that have examined the Questionnaire about the Process of Recovery in other languages. This study provides preliminary evidence that the German version of the Questionnaire about the Process of Recovery is a reliable assessment instrument for measuring personal recovery among people with mental illness experiences. However, it is necessary to conduct further psychometric tests to verify the validity and reliability of the instrument. The German version of the Questionnaire about the Process of Recovery can be applied to both research and clinical practice, especially as a means of facilitating communication during the planning and evaluation of treatment goals.


Language , Humans , Psychometrics , Reproducibility of Results , Cross-Sectional Studies , Surveys and Questionnaires , Factor Analysis, Statistical
5.
Front Psychiatry ; 13: 983999, 2022.
Article En | MEDLINE | ID: mdl-36299547

Background: The positive effects of both antipsychotic medication and cognitive behavioral therapy in psychosis (CBTp) for people who are distressed by their experience of hearing voices remain limited. As a result, there has been a recent surge in talk-based individual approaches. Many of these continue not to be very well known nor implemented in practice. Some of the approaches may focus more on understanding and dealing constructively with voices, an element that has been identified as potentially helpful by voice hearers. Existing barriers to a wider implementation include both the widespread pathologization of hearing voices and a lack of mental health professionals who have been trained and trusted to carry out these new interventions. Methods: This scoping review aimed to identify and describe a current synthesis of talk-based individual approaches for people who hear voices, including studies independently of method of study or approach, diagnosis of voice hearers nor of the professional background of interventionists. Results: Nine different talk-based approaches were identified. These included: (1) Cognitive Behavioral Therapy for Psychosis (CBTp); (2) AVATAR therapy; (3) Making Sense of Voices (MsV) aka Experience Focused Counselling (EFC); (4) Relating Therapy; (5) Acceptance and Commitment Therapy; (6) Smartphone-based Coping-focused Intervention; (7) Prolonged and Virtual Reality Exposure Therapy; (8) Eye Movement Desensitization and Reprocessing, and (9) Individual Mindfulness-based Program for Voice Hearing. The different approaches differed greatly in relation to the number of sessions, length of time offered and the scientific evidence on efficacy. Psychologists represented the main professional group of interventionists. CBTp and the MsV/EFC approach also included health professionals, like nurses, as implementers. Most of the approaches showed positive outcomes in relation to voice related distress levels. None identified overall or voice specific deteriorations. Conclusion: There appears to be a strong case for the implementation of a broader heterogeneity of approaches in practice. This would also be in line with recommendations for recovery focused services and requirements of voice hearers. A greater emphasis on whole systems implementation and thus the involvement of frontline staff, like nurses, in the delivery of these approaches would likely reduce the research-practice implementation gap.

6.
Int J Ment Health Nurs ; 30(6): 1640-1648, 2021 Dec.
Article En | MEDLINE | ID: mdl-34328258

Community mental health services are the service of choice in the mental health field. In recent years, demand for these services has increased significantly. Nurses play a central role in community mental health services. Nevertheless, predictive factors of the use of such services are unclear, especially in Switzerland. This study aimed to examine relevant predictors of persons with mental health problems' use of community mental health nursing services in Switzerland. Swiss Health Survey 2017 data were used to compare those who use community mental health nursing services with those who do not. We found that age, number of doctor visits, problems with instrumental activities of daily life, use of informal help, use of emergency services, taking psychotropic medication, being female, and living without a partner were positive predictors, while experiencing severe physical symptoms was a negative predictor. Several of our findings confirm the similarity between the utilization of community mental health nursing services and the use of community mental health services in general. Our results suggest that community mental health nursing services deserve the same prominent place in the mental health system and its corresponding policies. This should be taken as an argument for policy development and better reimbursement. In research, health surveys should focus on nursing and need-related questions. Additionally, it is necessary to develop community mental health nursing services from an add-on service into independent nursing services and evaluate these services.


Community Mental Health Services , Nurses , Psychiatric Nursing , Female , Humans , Mental Health , Switzerland
7.
Plant J ; 107(5): 1387-1402, 2021 09.
Article En | MEDLINE | ID: mdl-34165836

Cytokinins regulate diverse aspects of plant growth and development, primarily through modulation of gene expression. The cytokinin-responsive transcriptome has been thoroughly described in dicots, especially Arabidopsis, but much less so in monocots. Here, we present a meta-analysis of five different transcriptomic analyses of rice (Oryza sativa) roots treated with cytokinin, including three previously unpublished experiments. We developed a treatment method in which hormone is added to the media of rice seedlings grown in sterile hydroponic culture under a continuous airflow, which resulted in minimal perturbation of the seedlings, thus greatly reducing changes in gene expression in the absence of exogenous hormone. We defined a core set of 205 upregulated and 86 downregulated genes that were differentially expressed in at least three of the transcriptomic datasets. This core set includes genes encoding the type-A response regulators (RRs) and cytokinin oxidases/dehydrogenases, which have been shown to be primary cytokinin response genes. GO analysis revealed that the upregulated genes were enriched for terms related to cytokinin/hormone signaling and metabolism, while the downregulated genes were significantly enriched for genes encoding transporters. Variations of type-B RR binding motifs were significantly enriched in the promoters of the upregulated genes, as were binding sites for other potential partner transcription factors. The promoters of the downregulated genes were generally enriched for distinct cis-acting motifs and did not include the type-B RR binding motif. This analysis provides insight into the molecular mechanisms underlying cytokinin action in a monocot and provides a useful foundation for future studies of this hormone in rice and other cereals.


Cytokinins/pharmacology , Gene Expression Regulation, Plant , Oryza/genetics , Plant Growth Regulators/pharmacology , Signal Transduction , Transcriptome/drug effects , Acetylation , Gene Expression Profiling , Oryza/physiology , Plant Proteins/genetics , Plant Proteins/metabolism , Plant Roots/genetics , Plant Roots/physiology , Promoter Regions, Genetic/genetics , Seedlings/genetics , Seedlings/physiology , Wounds and Injuries
8.
Plant J ; 106(1): 159-173, 2021 04.
Article En | MEDLINE | ID: mdl-33421204

The phytohormone cytokinin plays a significant role in nearly all aspects of plant growth and development. Cytokinin signaling has primarily been studied in the dicot model Arabidopsis, with relatively little work done in monocots, which include rice (Oryza sativa) and other cereals of agronomic importance. The cytokinin signaling pathway is a phosphorelay comprised of the histidine kinase receptors, the authentic histidine phosphotransfer proteins (AHPs) and type-B response regulators (RRs). Two negative regulators of cytokinin signaling have been identified: the type-A RRs, which are cytokinin primary response genes, and the pseudo histidine phosphotransfer proteins (PHPs), which lack the His residue required for phosphorelay. Here, we describe the role of the rice PHP genes. Phylogenic analysis indicates that the PHPs are generally first found in the genomes of gymnosperms and that they arose independently in monocots and dicots. Consistent with this, the three rice PHPs fail to complement an Arabidopsis php mutant (aphp1/ahp6). Disruption of the three rice PHPs results in a molecular phenotype consistent with these elements acting as negative regulators of cytokinin signaling, including the induction of a number of type-A RR and cytokinin oxidase genes. The triple php mutant affects multiple aspects of rice growth and development, including shoot morphology, panicle architecture, and seed fill. In contrast to Arabidopsis, disruption of the rice PHPs does not affect root vascular patterning, suggesting that while many aspects of key signaling networks are conserved between monocots and dicots, the roles of at least some cytokinin signaling elements are distinct.


Arabidopsis Proteins/metabolism , Arabidopsis/metabolism , Oryza/metabolism , Plant Proteins/metabolism , Arabidopsis/genetics , Arabidopsis Proteins/genetics , Cytokinins/metabolism , Gene Expression Regulation, Plant/genetics , Gene Expression Regulation, Plant/physiology , Oryza/genetics , Plant Growth Regulators/metabolism , Plant Proteins/genetics
9.
Int J Ment Health Nurs ; 30(2): 451-460, 2021 Apr.
Article En | MEDLINE | ID: mdl-33118298

The 'Experienced Involvement' (EX-IN) training programme prepares and certifies individuals who have experienced mental health problems to work as peer support workers and to support others challenged by similar conditions. We aimed to assess the impact of the EX-IN training on hope, self-efficacy, introspection, stigma resistance, personal recovery, health-related quality of life and employment in participants. Data was collected using standardized assessment instruments before the training started (t1) and upon course completion (t2). Data from 103 participants who participated in both measurement times were included into data analysis. Participants significantly improved their recovery, stigma resistance and introspection during the EX-IN training. In addition, a significant higher proportion of participants were employed at t2. Participants whose last inpatient stay was 0-1 year before the start of the EX-IN training showed significantly lower levels of stigma resistance, and self-efficacy at t1 than participants with two or more years since the last inpatient stay. There were no significant changes in mean values over time, or in the mean values at t2 between the two groups. EX-IN training has a positive influence on the handling of stigma, on one's recovery path and introspection. This indicates that EX-IN training has a therapeutic effect on the participants. EX-IN training seems to meet the challenges of peer support work. Therefore, the training can be recommended as preparation for working as a peer support worker as well as an intervention to improve one´s recovery process.


Mental Disorders , Quality of Life , Germany , Humans , Mental Disorders/therapy , Peer Group , Switzerland
10.
Psychiatr Prax ; 48(3): 135-142, 2021 Apr.
Article De | MEDLINE | ID: mdl-33232979

AIM OF THE STUDY: To identify work contents, roles and tasks of peer workers in mental health services in the German-speaking part of Switzerland. METHODS: A survey was conducted among peers in the German-speaking part of Switzerland. RESULTS: Most respondents stated that they work mainly in specialized services in the treatment of people with psychoses and affective disorders and in direct contact with service users. "Building bridges" between service users and professionals, conveying hope and confidence, empowerment as well as support in symptom management was most frequently indicated as a work activity. The majority of respondents have job descriptions that correspond to their activities. CONCLUSIONS: For mental health services, the challenge is to integrate the new professional group of peers workers as well as possible without undermining their proximity to the service users or their possibly critical perspective with regard to the existing practice.


Mental Disorders , Mental Health , Germany , Humans , Mental Disorders/therapy , Peer Group , Research , Surveys and Questionnaires , Switzerland
11.
Front Public Health ; 8: 560389, 2020.
Article En | MEDLINE | ID: mdl-33262966

Background: The swift spread of SARS-CoV-2 provides a challenge worldwide. As a consequence of restrictive public health measures like isolation, quarantine, and community containment, the provision of mental health services is a major challenge. Evidence from past virus epidemics and the current SARS-CoV-2 outbreak indicate high prevalence rates of mental health problems (MHP) as short- and long-term consequences. However, a broader picture of MHP among different populations is still lacking. Methods: We conducted a rapid review on MHP prevalence rates published since 2000, during and after epidemics, including the general public, health care workers, and survivors. Any quantitative articles reporting on MHP rates were included. Out of 2,855 articles screened, a total of 74 were included in this review. Results: Most original studies on MHP were conducted in China in the context of SARS-CoV-1, and reported on anxiety, depression, post-traumatic stress symptoms/disorder, general psychiatric morbidity, and psychological symptoms. The MHP rates across studies, populations, and epidemics vary substantially. While some studies show high and persistent rates of MHP in populations directly affected by isolation, quarantine, threat of infection, infection, or life-threatening symptoms (e.g., health care workers), other studies report minor effects. Furthermore, even less affected populations (e.g., distant to epidemic epicenter, no contact history with suspected or confirmed cases) can show high rates of MHP. Discussion: MHP vary largely across countries and risk-groups in reviewed studies. The results call attention to potentially high MHP during epidemics. Individuals affected directly by an epidemic might be at a higher risk of short or even long-term mental health impairments. This study delivers insights stemming from a wide range of psychiatric instruments and questionnaires. The results call for the use of validated and standardized instruments, reference norms, and pre-post measurements to better understand the magnitude of the MHP during and after the epidemics. Nevertheless, emerging MHP should be considered during epidemics including the provision of access to mental health care to mitigate potential mental impairments.


COVID-19 , Epidemics , China , Health Personnel , Humans , Mental Health , Prevalence , SARS-CoV-2 , Survivors
12.
Development ; 147(20)2020 10 27.
Article En | MEDLINE | ID: mdl-33028608

The phytohormone cytokinin regulates diverse aspects of plant growth and development. Our understanding of the metabolism and perception of cytokinin has made great strides in recent years, mostly from studies of the model dicot Arabidopsis Here, we employed a CRISPR/Cas9-based approach to disrupt a subset of cytokinin histidine kinase (HK) receptors in rice (Oryza sativa) in order to explore the role of cytokinin in a monocot species. In hk5 and hk6 single mutants, the root growth, leaf width, inflorescence architecture and/or floral development were affected. The double hk5 hk6 mutant showed more substantial defects, including severely reduced root and shoot growth, a smaller shoot apical meristem, and an enlarged root cap. Flowering was delayed in the hk5 hk6 mutant and the panicle was significantly reduced in size and infertile due to multiple defects in floral development. The hk5 hk6 mutant also exhibited a severely reduced cytokinin response, consistent with the developmental phenotypes arising from a defect in cytokinin signaling. These results indicate that HK5 and HK6 act as cytokinin receptors, with overlapping functions to regulate diverse aspects of rice growth and development.


Cytokinins/metabolism , Oryza/metabolism , Plant Proteins/metabolism , Receptors, Cell Surface/metabolism , Cytokinins/pharmacology , Flowers/drug effects , Flowers/growth & development , Meristem/drug effects , Meristem/growth & development , Mutation/genetics , Oryza/anatomy & histology , Oryza/drug effects , Plant Roots/drug effects , Plant Roots/growth & development , Plant Shoots/drug effects , Plant Shoots/growth & development , Seeds/drug effects , Seeds/growth & development
13.
Int J Ment Health Nurs ; 29(2): 212-223, 2020 Apr.
Article En | MEDLINE | ID: mdl-31618530

Peer work is now known in Switzerland for 10 years and has developed strongly. The aim of the study was to describe peer support specialists' (PSSs') work conditions and job satisfaction, as well as the challenges of integration into the workforce in Switzerland. A further aim was to identify possible development topics in the preparation of PSSs for working with peer support work (PSW) training and interventions within the working field. We launched a survey with a self-developed questionnaire for people with lived experiences with mental illness and recovery who were working as PSSs or experts by experience in education, research, politics, and other areas in the German-speaking region of Switzerland. The survey took place from 1 September 2017 to 15 November 2017. The results show that PSSs were working mostly in 1:1 contact with service users and in education and noticeably less in politics and research. Their work conditions and job satisfaction seemed good. Most PSSs had job descriptions matching their duties, were satisfied with their salaries, and indicated being satisfied or very satisfied with their work. Amongst other aspects, the greatest challenge reported was integration into the inter-disciplinary working team. PSS training should better consider the working areas of experts by experience in the fields of politics and research to reinforce employment opportunities in these work areas. To increase the impacts of PSSs and to improve integration into the workspace, the preparation of professionals and institutions should be improved by means of information sessions, trainings, and guidelines.


Mental Disorders/therapy , Peer Group , Social Support , Adult , Employment , Female , Humans , Job Satisfaction , Male , Mental Disorders/psychology , Mental Disorders/rehabilitation , Mental Health Services , Middle Aged , Return to Work/psychology , Surveys and Questionnaires , Switzerland
14.
Plant Cell Physiol ; 59(8): 1608-1620, 2018 Aug 01.
Article En | MEDLINE | ID: mdl-29912402

The clustered regularly interspaced short palindromic repeat (CRISPR)/CRISPR-associated nuclease 9 (Cas9) system is a genome editing technology transforming the field of plant biology by virtue of the system's efficiency and specificity. The system has quickly evolved for many diverse applications including multiplex gene mutation, gene replacement and transcriptional control. As CRISPR/Cas9 is increasingly applied to plants, it is becoming clear that each component of the system can be modified to improve editing results. This review aims to highlight common considerations and options when conducting CRISPR/Cas9 experiments.


CRISPR-Cas Systems/genetics , Genome, Plant/genetics , Clustered Regularly Interspaced Short Palindromic Repeats/genetics , Gene Editing , Genetic Engineering , Plants, Genetically Modified/genetics
15.
Psychiatr Prax ; 44(6): 348-355, 2017 Sep.
Article De | MEDLINE | ID: mdl-27618170

Objective Personal recovery as a key concept in mental health requests that people with severe mental illness need support in taking positive risks, especially from mental health nurses as key players in this context. In German-speaking countries, studies regarding positive risk-taking seem scarce. Attitude as a concept of social psychology seems to be important to this topic, because it strongly influences the human behavior. Therefore, this study examines the attitudes of mental health nurses in outpatient settings towards their patients taking positive risks and their perception of the institutional position regarding this issue. Methods Four focus group interviews were conducted and analyzed using a descriptive content-analysis approach. Results Three main categories were identified: the concept of risk, the nurses' ambivalence and the institutions' ambivalence. Nurses seem to generally connote risk negatively. Their attitudes towards positive risks can be described as ambivalent, oscillating between openness and aversion and their institutions perceive it similarly. Conclusion Results from other studies can be confirmed. Nurses expect clear position from their institution regarding positive risk-taking and increased support. Guidelines are missing in practice.


Attitude of Health Personnel , Negotiating , Psychiatric Nursing , Rejection, Psychology , Risk-Taking , Adaptation, Psychological , Adult , Female , Focus Groups , Germany , Guideline Adherence , Hospitals, Psychiatric , Humans , Male , Middle Aged , Nurse-Patient Relations , Outpatient Clinics, Hospital , Qualitative Research
16.
Development ; 140(9): 1924-35, 2013 May.
Article En | MEDLINE | ID: mdl-23515473

The shoot epidermis of land plants serves as a crucial interface between plants and the atmosphere: pavement cells protect plants from desiccation and other environmental stresses, while stomata facilitate gas exchange and transpiration. Advances have been made in our understanding of stomatal patterning and differentiation, and a set of 'master regulatory' transcription factors of stomatal development have been identified. However, they are limited to specifying stomatal differentiation within the epidermis. Here, we report the identification of an Arabidopsis homeodomain-leucine zipper IV (HD-ZIP IV) protein, HOMEODOMAIN GLABROUS2 (HDG2), as a key epidermal component promoting stomatal differentiation. HDG2 is highly enriched in meristemoids, which are transient-amplifying populations of stomatal-cell lineages. Ectopic expression of HDG2 confers differentiation of stomata in internal mesophyll tissues and occasional multiple epidermal layers. Conversely, a loss-of-function hdg2 mutation delays stomatal differentiation and, rarely but consistently, results in aberrant stomata. A closely related HD-ZIP IV gene, Arabidopsis thaliana MERISTEM LAYER1 (AtML1), shares overlapping function with HDG2: AtML1 overexpression also triggers ectopic stomatal differentiation in the mesophyll layer and atml1 mutation enhances the stomatal differentiation defects of hdg2. Consistently, HDG2 and AtML1 bind the same DNA elements, and activate transcription in yeast. Furthermore, HDG2 transactivates expression of genes that regulate stomatal development in planta. Our study highlights the similarities and uniqueness of these two HD-ZIP IV genes in the specification of protodermal identity and stomatal differentiation beyond predetermined tissue layers.


Arabidopsis Proteins/metabolism , Arabidopsis/metabolism , Homeodomain Proteins/metabolism , Plant Epidermis/metabolism , Plant Stomata/metabolism , Arabidopsis/classification , Arabidopsis/cytology , Arabidopsis/growth & development , Arabidopsis Proteins/genetics , Biomarkers/metabolism , Cell Differentiation , Cloning, Molecular , Cotyledon/cytology , Cotyledon/metabolism , Gene Expression Regulation, Plant , Genes, Plant , Homeodomain Proteins/genetics , Mesophyll Cells/cytology , Mesophyll Cells/metabolism , Mutation , Phylogeny , Plant Epidermis/cytology , Plant Stomata/cytology , Plant Stomata/growth & development , Plants, Genetically Modified/cytology , Plants, Genetically Modified/growth & development , Plants, Genetically Modified/metabolism , Transcriptional Activation , Two-Hybrid System Techniques
18.
Plant Physiol ; 156(4): 1837-50, 2011 Aug.
Article En | MEDLINE | ID: mdl-21628627

Receptor-like kinase-mediated cell signaling pathways play fundamental roles in many aspects of plant growth and development. A pair of Arabidopsis (Arabidopsis thaliana) leucine-rich repeat receptor-like kinases (LRR-RLKs), HAESA (HAE) and HAESA-LIKE2 (HSL2), have been shown to activate the cell separation process that leads to organ abscission. Another pair of LRR-RLKs, EVERSHED (EVR) and SOMATIC EMBRYOGENESIS RECEPTOR-LIKE KINASE1, act as inhibitors of abscission, potentially by modulating HAE/HSL2 activity. Cycling of these RLKs to and from the cell surface may be regulated by NEVERSHED (NEV), a membrane trafficking regulator that is essential for organ abscission. We report here the characterization of CAST AWAY (CST), a receptor-like cytoplasmic kinase that acts as a spatial inhibitor of cell separation. Disruption of CST suppresses the abscission defects of nev mutant flowers and restores the discrete identity of the trans-Golgi network in nev abscission zones. After organ shedding, enlarged abscission zones with obscured boundaries are found in nev cst flowers. We show that CST is a dual-specificity kinase in vitro and that myristoylation at its amino terminus promotes association with the plasma membrane. Using the bimolecular fluorescence complementation assay, we have detected interactions of CST with HAE and EVR at the plasma membrane of Arabidopsis protoplasts and hypothesize that CST negatively regulates cell separation signaling directly and indirectly. A model integrating the potential roles of receptor-like kinase signaling and membrane trafficking during organ separation is presented.


Arabidopsis Proteins/metabolism , Arabidopsis/cytology , Arabidopsis/enzymology , Cell Membrane/enzymology , Flowers/physiology , Phosphotransferases/metabolism , Protein Serine-Threonine Kinases/metabolism , Receptors, Cell Surface/metabolism , Alleles , Amino Acid Sequence , Arabidopsis/physiology , Arabidopsis/ultrastructure , Arabidopsis Proteins/chemistry , Arabidopsis Proteins/genetics , Cytoplasm/enzymology , Flowers/cytology , Flowers/enzymology , Flowers/ultrastructure , Models, Biological , Molecular Sequence Data , Mutation/genetics , Myristic Acid/metabolism , Organ Specificity , Phosphotransferases/chemistry , Phosphotransferases/genetics , Plant Roots/cytology , Plant Roots/enzymology , Plant Stomata/cytology , Plant Stomata/enzymology , Protein Binding , Protein Serine-Threonine Kinases/chemistry , Protein Serine-Threonine Kinases/genetics , Protein Transport , Receptors, Cell Surface/chemistry , Receptors, Cell Surface/genetics , Subcellular Fractions/enzymology , Substrate Specificity
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