Effects of down-regulating ornithine decarboxylase upon putrescine-associated metabolism and growth in Nicotiana tabacum L.

Transgenic plants of Nicotiana tabacum L. homozygous for an RNAi construct designed to silence ornithine decarboxylase (ODC) had significantly lower concentrations of nicotine and nornicotine, but significantly higher concentrations of anatabine, compared with vector-only controls. Silencing of ODC also led to significantly reduced concentrations of polyamines (putrescine, spermidine and spermine), tyramine and phenolamides (caffeoylputrescine and dicaffeoylspermidine) with concomitant increases in concentrations of amino acids ornithine, arginine, aspartate, glutamate and glutamine. Root transcript levels of S-adenosyl methionine decarboxylase, S-adenosyl methionine synthase and spermidine synthase (polyamine synthesis enzymes) were reduced compared with vector controls, whilst transcript levels of arginine decarboxylase (putrescine synthesis), putrescine methyltransferase (nicotine production) and multi-drug and toxic compound extrusion (alkaloid transport) proteins were elevated. In contrast, expression of two other key proteins required for alkaloid synthesis, quinolinic acid phosphoribosyltransferase (nicotinic acid production) and a PIP-family oxidoreductase (nicotinic acid condensation reactions), were diminished in roots of odc-RNAi plants relative to vector-only controls. Transcriptional and biochemical differences associated with polyamine and alkaloid metabolism were exacerbated in odc-RNAi plants in response to different forms of shoot damage. In general, apex removal had a greater effect than leaf wounding alone, with a combination of these injury treatments producing synergistic responses in some cases. Reduced expression of ODC appeared to have negative effects upon plant growth and vigour with some leaves of odc-RNAi lines being brittle and bleached compared with vector-only controls. Together, results of this study demonstrate that ornithine decarboxylase has important roles in facilitating both primary and secondary metabolism in Nicotiana

LOCALIZER: subcellular localization prediction of both plant and effector proteins in the plant cell

Pathogens secrete effector proteins and many operate inside plant cells to enable infection. Some effectors have been found to enter subcellular compartments by mimicking host targeting sequences. Although many computational methods exist to predict plant protein subcellular localization, they perform poorly for effectors. We introduce LOCALIZER for predicting plant and effector protein localization to chloroplasts, mitochondria, and nuclei. LOCALIZER shows greater prediction accuracy for chloroplast and mitochondrial targeting compared to other methods for 652 plant proteins. For 107 eukaryotic effectors, LOCALIZER outperforms other methods and predicts a previously unrecognized chloroplast transit peptide for the ToxA effector, which we show translocates into tobacco chloroplasts. Secretome-wide predictions and confocal microscopy reveal that rust fungi might have evolved multiple effectors that target chloroplasts or nuclei. LOCALIZER is the first method for predicting effector localisation in plants and is a valuable tool for prioritizing effector candidates for functional investigations. LOCALIZER is available at http://localizer.csiro.au/.JS is supported by an OCE Postdoctoral Fellowship

Identifying the needs of brain tumor patients and their caregivers

The purpose of this study is to identify the needs of brain tumor patients and their caregivers to provide improved health services to these populations. Two different questionnaires were designed for patients and caregivers. Both questionnaires contained questions pertaining to three realms: disease symptoms/treatment, health care provider, daily living/finances. The caregivers’ questionnaires contained an additional domain on emotional needs. Each question was evaluated for the degree of importance and satisfaction. Exploratory analyses determined whether baseline characteristics affect responder importance or satisfaction. Also, areas of high agreement/disagreement in satisfaction between the participating patient-caregiver pairs were identified. Questions for which >50% of the patients and caregivers thought were “very important” but >30% were dissatisfied include: understanding the cause of brain tumors, dealing with patients’ lower energy, identifying healthful foods and activities for patients, telephone access to health care providers, information on medical insurance coverage, and support from their employer. In the emotional realm, caregivers identified 9 out of 10 items as important but need further improvement. Areas of high disagreement in satisfaction between participating patient-caregiver pairs include: getting help with household chores (P value = 0.006) and finding time for personal needs (P value < 0.001). This study provides insights into areas to improve services for brain tumor patients and their caregivers. The caregivers’ highest amount of burden is placed on their emotional needs, emphasizing the importance of providing appropriate medical and psychosocial support for caregivers to cope with emotional difficulties they face during the patients’ treatment process

An Interspecific Nicotiana Hybrid as a Useful and Cost-Effective Platform for Production of Animal Vaccines

The use of transgenic plants to produce novel products has great biotechnological potential as the relatively inexpensive inputs of light, water, and nutrients are utilised in return for potentially valuable bioactive metabolites, diagnostic proteins and vaccines. Extensive research is ongoing in this area internationally with the aim of producing plant-made vaccines of importance for both animals and humans. Vaccine purification is generally regarded as being integral to the preparation of safe and effective vaccines for use in humans. However, the use of crude plant extracts for animal immunisation may enable plant-made vaccines to become a cost-effective and efficacious approach to safely immunise large numbers of farm animals against diseases such as avian influenza. Since the technology associated with genetic transformation and large-scale propagation is very well established in Nicotiana, the genus has attributes well-suited for the production of plant-made vaccines. However the presence of potentially toxic alkaloids in Nicotiana extracts impedes their use as crude vaccine preparations. In the current study we describe a Nicotiana tabacum and N. glauca hybrid that expresses the HA glycoprotein of influenza A in its leaves but does not synthesize alkaloids. We demonstrate that injection with crude leaf extracts from these interspecific hybrid plants is a safe and effective approach for immunising mice. Moreover, this antigen-producing alkaloid-free, transgenic interspecific hybrid is vigorous, with a high capacity for vegetative shoot regeneration after harvesting. These plants are easily propagated by vegetative cuttings and have the added benefit of not producing viable pollen, thus reducing potential problems associated with bio-containment. Hence, these Nicotiana hybrids provide an advantageous production platform for partially purified, plant-made vaccines which may be particularly well suited for use in veterinary immunization programs

Are codesigned programmes more difficult to implement? A qualitative study of staff perceptions on the implementation of a new youth mental health programme

Abstract Background Codesigned interventions are becoming more common in health services and, in particular, in the design and development of mental health programmes and interventions. However, previous research has established that the transition from codesign to implementation can experience several challenges and that this transition process has received little research attention. Objective The aim of this study was to explore the experience of staff members charged with the implementation of a codesigned intervention for young people and adolescents at risk of suicide. Setting and Participants Five staff members involved in the implementation of the new codesigned programme took part in semi‐structured interviews. Method The study involved qualitative evaluation of staff experiences during the implementation of a new child and youth suicide intervention. Interviews were analysed using reflexive thematic analysis. Results The analysis identified four themes of ‘disconnect’, ‘operational challenges, ‘service user’ and ‘being authentic’. ‘Disconnect’ captures the difficulties of implementing a codesigned programme which leads to ‘operational challenges’ in meeting broader expectations while ensuring the feasibility of the programme. The third theme, ‘service user’, captures the realisation that the young people accessing the new service were different to those involved in the codesign process. The final theme, ‘being authentic’, highlights how staff needed to be responsive and flexible while remaining true to the principles proposed in the codesign. Discussion This study yielded some valuable insights into the challenges around the implementation of a codesigned intervention, an under‐researched area. The findings suggest that adaption of the design may be necessary, if it is not informed by implementation constraints, making it necessary for the implementation team to be well‐briefed on the initial design and given plenty of time to make the necessary adjustments in a coproduction process. Limitations for the generalisation of the results include a small sample of staff and particular challenges that may be unique to this study. Conclusion The present study highlights that for health services undertaking codesign approaches, appropriate time and resources need to be considered for the implementation phase of an initiative, to ensure that there is effective translation from design to implementation and that new codesigned services can be effective within operational constraints. Patient and Public Contribution The authors would like to thank and acknowledge the young people with a lived‐experience and their carers who participated in the codesign process and research evaluation component of this study. We also wish to thank the clinical staff, peer workers and family peer workers who participated in the evaluation

A qualitative evaluation of a co‐design process involving young people at risk of suicide

Abstract Background Co‐design is becoming common practice in the development of mental health services, however, little is known about the experience of such practices, particularly when young people are involved. Objective The aim of this study was to conduct a process evaluation of the co‐design which was undertaken for the development of an intervention for youth and adolescents at risk of suicide. This paper briefly outlines the co‐design process undertaken during a COVID‐19 lockdown and then focuses on a qualitative evaluation of the experience of taking part in a co‐design process. Setting and Participants The evaluation involved young consumers of a public youth mental health service, their carers/parents and service delivery staff who had taken part in the co‐design process. Method This study used follow‐up semistructured interviews with the co‐design participants to explore their experience of the co‐design process. Inductive thematic analysis was used to draw out common themes from the qualitative data. Results It was found that despite the practical efforts of the project team to minimise known issues in co‐design, challenges centred around perceptions regarding power imbalance, the need for extensive consultation and time constraints still arose. Discussion Despite these challenges, the study found that the co‐design provided a human‐centred, accessible and rewarding process for young people, parents and staff members, leaving them with the feeling that they had made a worthwhile contribution to the design of the new service, as well as contributing to changing practice in service design. Conclusion With sensitivity and adaptation to usual practice, it is possible to include young people with suicidal ideation, their parents/carers and professional staff in a safe and effective co‐design process. Patient and Public Contribution The authors would like to thank and acknowledge the young people with a lived experience and their carers who participated in the co‐design process and research evaluation component of this study. We also wish to thank the clinical staff, peer workers and family peer workers who participated in this research

The A622 gene in Nicotiana glauca (tree tobacco): evidence for a functional role in pyridine alkaloid synthesis

Nicotiana glauca (Argentinean tree tobacco) is atypical within the genus Nicotiana, accumulating predominantly anabasine rather than nicotine and/or nornicotine as the main component of its leaf pyridine alkaloid fraction. The current study examines the role of the A622 gene from N. glauca (NgA622) in alkaloid production and utilises an RNAi approach to down-regulate gene expression and diminish levels of A622 protein in transgenic tissues. Results indicate that RNAi-mediated reduction in A622 transcript levels markedly reduces the capacity of N. glauca to produce anabasine resulting in plants with scarcely any pyridine alkaloids in leaf tissues, even after damage to apical tissues. In addition, analysis of hairy roots containing the NgA622-RNAi construct shows a substantial reduction in both anabasine and nicotine levels within these tissues, even if stimulated with methyl jasmonate, indicating a role for the A622 enzyme in the synthesis of both alkaloids in roots of N. glauca. Feeding of Nicotinic Acid (NA) to hairy roots of N. glauca containing the NgA622-RNAi construct did not restore capacity for synthesis of anabasine or nicotine. Moreover, treatment of these hairy root lines with NA did not lead to an increase in anatabine levels, unlike controls. Together, these results strongly suggest that A622 is an integral component of the final enzyme complex responsible for biosynthesis of all three pyridine alkaloids in Nicotiana

Identification and profiling of narrow-leafed lupin (Lupinus angustifolius) microRNAs during seed development

Abstract Background Whilst information regarding small RNAs within agricultural crops is increasing, the miRNA composition of the nutritionally valuable pulse narrow-leafed lupin (Lupinus angustifolius) remains unknown. Results By conducting a genome- and transcriptome-wide survey we identified 7 Dicer-like and 16 Argonaute narrow-leafed lupin genes, which were highly homologous to their legume counterparts. We identified 43 conserved miRNAs belonging to 16 families, and 13 novel narrow-leafed lupin-specific miRNAs using high-throughput sequencing of small RNAs from foliar and root and five seed development stages. We observed up-regulation of members of the miRNA families miR167, miR399, miR156, miR319 and miR164 in narrow-leafed lupin seeds, and confirmed expression of miR156, miR166, miR164, miR1507 and miR396 using quantitative RT-PCR during five narrow-leafed lupin seed development stages. We identified potential targets for the conserved and novel miRNAs and were able to validate targets of miR399 and miR159 using 5′ RLM-RACE. The conserved miRNAs are predicted to predominately target transcription factors and 93% of the conserved miRNAs originate from intergenic regions. In contrast, only 43% of the novel miRNAs originate from intergenic regions and their predicted targets were more functionally diverse. Conclusion This study provides important insights into the miRNA gene regulatory networks during narrow-leafed lupin seed development