Poly(A) binding protein 1 (PABP1) plays a central role in mRNA translation and stability and is a target by many viruses in diverse manners. We report a novel viral translational control strategy involving the recruitment of PABP1 to the 5' leader internal ribosome entry site (5L IRES) of an immediate-early (IE) bicistronic mRNA that encodes the neurovirulence protein (pp14) from the avian herpesvirus Marek’s disease virus serotype 1 (MDV1). We provide evidence for the interaction between an internal poly(A) sequence within the 5L IRES and PABP1 which may occur concomitantly with the recruitment of PABP1 to the poly(A) tail. RNA interference and reverse genetic mutagenesis results show that a subset of virally encoded-microRNAs (miRNAs) targets the inhibitor of PABP1, known as paip2, and therefore plays an indirect role in PABP1 recruitment strategy by increasing the available pool of active PABP1. We propose a model that may offer a mechanistic explanation for the cap-independent enhancement of the activity of the 5L IRES by recruitment of a bona fide initiation protein to the 5' end of the message and that is, from the affinity binding data, still compatible with the formation of ‘closed loop’ structure of mRNA.
The mechanisms by which viruses modulate the immune system include changes in host genomic methylation. 5-hydroxymethylcytosine (5hmC) is the catalytic product of the Tet (Ten-11 translocation) family of enzymes and may serve as an intermediate of DNA demethylation. Recent reports suggest that 5hmC may confer consequences on cellular events including the pathogenesis of disease; in order to explore this possibility further we investigated both 5-methylcytosine (5mC) and 5hmC levels in healthy and diseased chicken bursas of Fabricius. We discovered that embryonic B-cells have high 5mC content while 5hmC decreases during bursa development. We propose that a high 5mC level protects from the mutagenic activity of the B-cell antibody diversifying enzyme activation induced deaminase (AID). In support of this view, AID mRNA increases significantly within the developing bursa from embryonic to post hatch stages while mRNAs that encode Tet family members 1 and 2 reduce over the same period. Moreover, our data revealed that infectious bursal disease virus (IBDV) disrupts this genomic methylation pattern causing a global increase in 5hmC levels in a mechanism that may involve increased Tet 1 and 2 mRNAs. To our knowledge this is the first time that a viral infection has been observed to cause global increases in genomic 5hmC within infected host tissues, underlining a mechanism that may involve the induction of B-cell genomic instability and cell death to facilitate viral egress.
To determine whether personality traits (conscientiousness, agreeableness, emotional regulation, extraversion, and openness to experience) are associated with glycemic control and blood glucose monitoring behavior, and change or stability of these outcomes over time, in young people with type 1 diabetes.
RESEARCH DESIGN AND METHODS
A 3-year longitudinal study was conducted using data from 142 individuals with type 1 diabetes, 8–19 years of age. Personality was assessed at baseline using the Five-Factor Personality Inventory for Children. Data relating to glycemic control (HbA1c) and frequency of blood glucose monitoring (based on meter memory) were collected annually. Relationships between personality traits and HbA1c and monitoring frequency were examined using regression models and mixed-design ANOVA.
Three of the Five-Factor domains were independently associated with glycemic control. Individuals high in conscientiousness and agreeableness had a lower and more stable HbA1c across the 3-year study period. In contrast, the HbA1c of individuals scoring low on these traits was either consistently worse or deteriorated over time. Low or high emotional regulation scores were also associated with worse glycemic control. By the third year, these domains, together with initial HbA1c, accounted for 39% of HbA1c variance. Conscientiousness was the only personality factor associated with blood glucose monitoring behavior.
Results of this study underline the importance of personality in contributing to diabetes outcomes. Attention to a young person’s personality, and appropriate tailoring of diabetes management to ensure an individualized approach, may help to optimize diabetes outcomes.
Achievement goal theory helps us understand what motivates students to participate in educational activities. However, measuring achievement goals in a precise manner is problematic. Elliot and McGregor’s Achievement Goal Questionnaire (AGQ) and Elliot and Murayama’s revised Achievement Goal Questionnaire (AGQ-R) are widely used to assess students’ achievement goals. Both instruments were developed and validated using undergraduate psychology students in the USA.
In this study, our aims were to first of all, assess the construct validity of both questionnaires using a cohort of Australian pharmacy students and, subsequently, to test the generalizability and replicability of these tools more widely in schools of pharmacy in other English-speaking countries. The AGQ and the AGQ-R were administered during tutorial class time. Confirmatory factor analysis procedures, using AMOS 19 software, were performed to determine model fit.
In contrast to the scale developers’ findings, confirmatory factor analysis supported a superior model fit for the AGQ compared with the AGQ-R, in all countries under study.
Validating measures of achievement goal motivation for use in pharmacy education is necessary and has implications for future research. Based on these results, the AGQ will be used to conduct future cross-sectional and longitudinal analyses of the achievement goals of undergraduate pharmacy students from these countries.
confirmatory factor analysis; achievement goal theory; pharmacy education
Objectives. To compare the achievement goal orientations of first-year with those of third-year undergraduate Australian pharmacy students and to examine the relationship of goal orientations to academic achievement.
Methods. The Achievement Goal Questionnaire was administered to first-year and third-year students during class time. Students’ grades were obtained from course coordinators.
Results. More first-year students adopted performance-approach and mastery-approach goals than did third-year students. Performance-approach goals were positively correlated with academic achievement in the first year. Chinese Australian students scored the highest in adopting performance-approach goals. Vietnamese Australian students adopted mastery-avoidance goals more than other ethnicities. First-year students were more strongly performance approach goal-oriented than third-year students.
Conclusion. Adopting performance-approach goals was positively correlated with academic achievement, while adopting avoidance goals was not. Ethnicity has an effect on the adoption of achievement goals and academic achievement.
achievement goals; achievement goal questionnaire; academic achievement; ethnicity
Objective. To investigate the relationships between pharmacy students’ preferred teacher qualities and their academic achievement goal orientations.
Methods. Participants completed an achievement goal questionnaire and a build-a-teacher task. For the latter, students were given a $20 hypothetical budget to purchase amounts of 9 widely valued teachers’ qualities.
Results. Three hundred sixty-six students participated. Students spent most of their budget on the traits of enthusiasm, expertise, and clear presentation style, and the least amount of money on interactive teaching, reasonable workload, warm personality, and intellectually challenging. In relation to achievement goals, negative associations were found between avoidance goals and preferences for teachers who encourage rigorous thinking and self-direction.
Conclusion. These novel findings provide a richer profile of the ways students respond to their learning environment. Understanding the relationships between teachers’ characteristics and pharmacy students’ achievement goal orientations will contribute to improving the quality of pharmacy learning and teaching environments.
achievement goals; motivation; pharmacy education; teacher qualities; student preferences
Pharmacy students require critical-thinking and problem-solving skills to integrate theory learned in the classroom with the complexities of practice, yet many pharmacy students fall short of acquiring these skills.1-2 Reflective practice activities encourage learning from the student’s own experiences and those of others, and offer a possible solution for the integration of knowledge-based curricula with the ambiguities of practice, as well as enhance communication and collaboration within a multidisciplinary team. Although reflective practices have been embraced elsewhere in health professions education, their strengths and shortcomings need to be considered when implementing such practices into pharmacy curricula. This review provides an overview of the evolution of theories related to reflective practice, critically examines the use of reflective tools (such as portfolios and blogs), and discusses the implications of implementing reflective practices in pharmacy education.
reflective practice; reflection; reflective learning; self-directed learning; pharmacy education
To date, the vast majority of known virus-encoded microRNAs (miRNAs) are derived from polymerase II transcripts encoded by DNA viruses. A recent demonstration that the bovine leukemia virus, a retrovirus, uses RNA polymerase III to directly transcribe the pre-miRNA hairpins to generate viral miRNAs further supports the common notion that the canonical pathway of miRNA biogenesis does not exist commonly among RNA viruses. Here, we show that an exogenous virus-specific region, termed the E element or XSR, of avian leukosis virus subgroup J (ALV-J), a member of avian retrovirus, encodes a novel miRNA, designated E (XSR) miRNA, using the canonical miRNA biogenesis pathway. Detection of novel microRNA species derived from the E (XSR) element, a 148-nucleotide noncoding RNA with hairpin structure, showed that the E (XSR) element has the potential to function as a microRNA primary transcript, demonstrating a hitherto unknown function with possible roles in myeloid leukosis associated with ALV-J.
Despite the availability of evidence-based guidelines for managing allergic rhinitis in primary care, management of the condition in the United Kingdom (UK) remains sub-optimal. Its high prevalence and negative effects on quality of life, school performance, productivity and co-morbid respiratory conditions (in particular, asthma), and high health and societal costs, make this a priority for developing novel models of care. Recent Australian research demonstrated the potential of a community pharmacy-based ‘goal-focused’ intervention to help people with intermittent allergic rhinitis to self-manage their condition better, reduce symptom severity and improve quality of life. In this pilot study we will assess the transferability of the goal-focused intervention to a UK context, the suitability of the intervention materials, procedures and outcome measures and collect data to inform a future definitive UK randomized controlled trial (RCT).
A pilot cluster RCT with associated preliminary economic analysis and embedded qualitative evaluation. The pilot trial will take place in two Scottish Health Board areas: Grampian and Greater Glasgow & Clyde. Twelve community pharmacies will be randomly assigned to intervention or usual care group. Each will recruit 12 customers seeking advice or treatment for intermittent allergic rhinitis. Pharmacy staff in intervention pharmacies will support recruited customers in developing strategies for setting and achieving goals that aim to avoid/minimize triggers for, and eliminate/minimize symptoms of allergic rhinitis. Customers recruited in non-intervention pharmacies will receive usual care. The co-primary outcome measures, selected to inform a sample size calculation for a future RCT, are: community pharmacy and customer recruitment and completion rates; and effect size of change in the validated mini-Rhinoconjunctivitis Quality of Life Questionnaire between baseline, one-week and six-weeks post-intervention. Secondary outcome measures relate to changes in symptom severity, productivity, medication adherence and self-efficacy. Quantitative data about accrual, retention and economic measures, and qualitative data about participants’ experiences during the trial will be collected to inform the future RCT.
This work will lay the foundations for a definitive RCT of a community pharmacy-based ‘goal-focused’ self-management intervention for people with intermittent allergic rhinitis. Results of the pilot trial are expected to be available in April 2013.
Current Controlled Trials
Respiratory; Allergy; Community pharmacy; Self-care
Objective. To develop, pilot test, and evaluate an instructional module on patient self-management for undergraduate pharmacy students in an Australian university.
Design. Learning outcomes and associated content and assessment tasks were developed, featuring lecture and readings, in-class discussions, and online delivery of in-depth interviews with patients who were living with chronic pain.
Assessment. Students completed a premodule and postmodule questionnaire and were further assessed by multiple-choice questions following completion of the module and again at the end of the semester. Positive changes were identified in the students’ discourse surrounding patient self-management of chronic pain. Responses to multiple-choice questions showed that knowledge was sustained over the course of the semester.
Conclusions. Completion of a comprehensive module on patient self-management increased undergraduate pharmacy students’ understanding and knowledge of patients experiencing chronic pain. The module could be implemented across other healthcare disciplines.
online learning; curriculum patient interviews; patient self-management; student perceptions; assessment
The role of community pharmacists in disease state management has been mooted for some years. Despite a number of trials of disease state management services, there is scant literature into the engagement of, and with, pharmacists in such trials. This paper reports pharmacists’ feedback as providers of a Pharmacy Asthma Management Service (PAMS), a trial coordinated across four academic research centres in Australia in 2009. We also propose recommendations for optimal involvement of pharmacists in academic research.
Feedback about the pharmacists’ experiences was sought via their participation in either a focus group or telephone interview (for those unable to attend their scheduled focus group) at one of three time points. A semi-structured interview guide focused discussion on the pharmacists’ training to provide the asthma service, their interactions with health professionals and patients as per the service protocol, and the future for this type of service. Focus groups were facilitated by two researchers, and the individual interviews were shared between three researchers, with data transcribed verbatim and analysed manually.
Of 93 pharmacists who provided the PAMS, 25 were involved in a focus group and seven via telephone interview. All pharmacists approached agreed to provide feedback. In general, the pharmacists engaged with both the service and research components, and embraced their roles as innovators in the trial of a new service. Some experienced challenges in the recruitment of patients into the service and the amount of research-related documentation, and collaborative patient-centred relationships with GPs require further attention. Specific service components, such as the spirometry, were well received by the pharmacists and their patients. Professional rewards included satisfaction from their enhanced practice, and pharmacists largely envisaged a future for the service.
The PAMS provided pharmacists an opportunity to become involved in an innovative service delivery model, supported by the researchers, yet trained and empowered to implement the clinical service throughout the trial period and beyond. The balance between support and independence appeared crucial in the pharmacists’ engagement with the trial. Their feedback was overwhelmingly positive, while useful suggestions were identified for future academic trials.
Pharmacy; Asthma; Disease management service; Experiences; Feedback
Lymphoid oncogenesis is a life threatening complication associated with a number of persistent viral infections (e.g. EBV and HTLV-1 in humans). With many of these infections it is difficult to study their natural history and the dynamics of tumor formation. Marek's Disease Virus (MDV) is a prevalent α-herpesvirus of poultry, inducing CD4+ TCRαβ+ T cell tumors in susceptible hosts. The high penetrance and temporal predictability of tumor induction raises issues related to the clonal structure of these lymphomas. Similarly, the clonality of responding CD8 T cells that infiltrate the tumor sites is unknown. Using TCRβ repertoire analysis tools, we demonstrated that MDV driven CD4+ T cell tumors were dominated by one to three large clones within an oligoclonal framework of smaller clones of CD4+ T cells. Individual birds had multiple tumor sites, some the result of metastasis (i.e. shared dominant clones) and others derived from distinct clones of transformed cells. The smaller oligoclonal CD4+ cells may represent an anti-tumor response, although on one occasion a low frequency clone was transformed and expanded after culture. Metastatic tumor clones were detected in the blood early during infection and dominated the circulating T cell repertoire, leading to MDV associated immune suppression. We also demonstrated that the tumor-infiltrating CD8+ T cell response was dominated by large oligoclonal expansions containing both “public” and “private” CDR3 sequences. The frequency of CD8+ T cell CDR3 sequences suggests initial stimulation during the early phases of infection. Collectively, our results indicate that MDV driven tumors are dominated by a highly restricted number of CD4+ clones. Moreover, the responding CD8+ T cell infiltrate is oligoclonal indicating recognition of a limited number of MDV antigens. These studies improve our understanding of the biology of MDV, an important poultry pathogen and a natural infection model of virus-induced tumor formation.
Many viral infections target the immune system, making use of the long lived, highly proliferative lymphocytes to propagate and survive within the host. This characteristic has led to an association between some viruses such as Epstein Barr Virus (EBV), Human T cell Lymphotrophic Virus-1 (HTLV-1) and Mareks Disease Virus (MDV) and lymphoid tumors. We employed methods for identifying the T cell receptor repertoire as a molecular bar-code to study the biology of MDV-induced tumors and the anti-tumor response. Each individual contained a small number of large (high frequency) tumor clones alongside some smaller (lower frequency) clones in the CD4+ T cell population. The tumor infiltrating CD8+ T cell response was highly focused with a small number of large clones, with one representing a public CDR3 sequence. This data is consistent with the recognition of a small number of dominant antigens and understanding the relationship between these and protective immunity is important to improve development of new vaccination strategies. Collectively, our results provide insights into the clonal structure of MDV driven tumors and in the responding CD8+ T cell compartment. These studies advance our understanding of MDV biology, an important poultry disease and a natural infection model of virus-induced tumor formation.
Notwithstanding the well-characterised roles of a number of oncogenes in neoplastic transformation, microRNAs (miRNAs) are increasingly implicated in several human cancers. Discovery of miRNAs in several oncogenic herpesviruses such as KSHV has further highlighted the potential of virus-encoded miRNAs to contribute to their oncogenic capabilities. Nevertheless, despite the identification of several possible cancer-related genes as their targets, the direct in vivo role of virus-encoded miRNAs in neoplastic diseases such as those induced by KSHV is difficult to demonstrate in the absence of suitable models. However, excellent natural disease models of rapid-onset Marek's disease (MD) lymphomas in chickens allow examination of the oncogenic potential of virus-encoded miRNAs. Using viruses modified by reverse genetics of the infectious BAC clone of the oncogenic RB-1B strain of MDV, we show that the deletion of the six-miRNA cluster 1 from the viral genome abolished the oncogenicity of the virus. This loss of oncogenicity appeared to be primarily due to the single miRNA within the cluster, miR-M4, the ortholog of cellular miR-155, since its deletion or a 2-nucleotide mutation within its seed region was sufficient to inhibit the induction of lymphomas. The definitive role of this miR-155 ortholog in oncogenicity was further confirmed by the rescue of oncogenic phenotype by revertant viruses that expressed either the miR-M4 or the cellular homolog gga-miR-155. This is the first demonstration of the direct in vivo role of a virus-encoded miRNA in inducing tumors in a natural infection model. Furthermore, the use of viruses deleted in miRNAs as effective vaccines against virulent MDV challenge, enables the prospects of generating genetically defined attenuated vaccines.
MicroRNAs (miRNAs), encoded in the genomes of a number of organisms including several viruses, belong to a class of small RNA molecules that can function as key regulators of gene expression influencing various biological processes and diseases including cancer. Among all the miRNAs, miR-155 has been well documented for its direct role of oncogenesis in a number of species including chickens. Remarkably, miR-K12-11 and miR-M4, the miRNAs encoded by the oncogenic Kaposi's sarcoma-associated herpesvirus (KSHV) and Marek's disease virus (MDV) respectively, have been shown to be functional orthologs of miR-155. There are no animal models of KSHV-induced tumors to examine the oncogenic potential of miR-K12-11. However, using recombinant mutant viruses in excellent models of MDV-induced lymphomas in their natural chicken hosts, we demonstrate that miR-M4 is critical for the induction of tumors. This is the first study that clearly demonstrates a direct role for a single miRNA in inducing cancer in an in vivo animal model. The ability of gga-miR-155 to rescue the oncogenic potential of miR-M4-deleted virus demonstrated the conservation of oncogenic functions the two miRNAs. Moreover, we show that virus attenuated by deleting the miRNAs can function as vaccines against virulent virus infection, enabling the prospects of generating novel molecularly-defined vaccines.
Bacterial artificial chromosome (BAC) vectors containing the full-length genomes of several herpesviruses have been used widely as tools to enable functional studies of viral genes. Marek's disease viruses (MDVs) are highly oncogenic alphaherpesviruses that induce rapid-onset T-cell lymphomas in chickens. Oncogenic strains of MDV reconstituted from BAC clones have been used to examine the role of viral genes in inducing tumours. Past studies have demonstrated continuous increase in virulence of MDV strains. We have previously reported on the UK isolate C12/130 that showed increased virulence features including lymphoid organ atrophy and enhanced tropism for the central nervous system. Here we report the construction of the BAC clones (pC12/130) of this strain. Chickens were infected with viruses reconstituted from the pC12/130 clones along with the wild-type virus for the comparison of the pathogenic properties. Our studies show that BAC-derived viruses induced disease similar to the wild-type virus, though there were differences in the levels of pathogenicity between individual viruses. Generation of BAC clones that differ in the potential to induce cytolytic disease provide the opportunity to identify the molecular determinants of increased virulence by direct sequence analysis as well as by using reverse genetics approaches on the infectious BAC clones.
To compare longitudinal data with previous cross-sectional data regarding Australian undergraduate pharmacy students' approaches to learning, and explore the differences in approaches to learning between undergraduate and postgraduate cohorts.
Longitudinal, repeated measures design using a validated self-report survey instrument were used to gather data.
Undergraduate students' preferences for meaning directed, undirected, and reproduction-directed approaches to learning displayed the same pattern across the 2 studies; however, application-directed scores increased significantly in the second half of the undergraduate degree program. Commencing postgraduate students' approaches to learning were similar to finishing undergraduate students, and this group was significantly more oriented towards meaning-directed learning compared to undergraduate students.
Pharmacy students' maturation in approach to their learning was evident and this bodes well for pharmacists' engaging in life-long learning and capacity to work in increasingly complex health settings.
lifelong learning; learning; Vermunt's Inventory of Learning Styles; longitudinal study
Despite national disease management plans, optimal asthma management remains a challenge in Australia. Community pharmacists are ideally placed to implement new strategies that aim to ensure asthma care meets current standards of best practice. The impact of the Pharmacy Asthma Care Program (PACP) on asthma control was assessed using a multi‐site randomised intervention versus control repeated measures study design.
Fifty Australian pharmacies were randomised into two groups: intervention pharmacies implemented the PACP (an ongoing cycle of assessment, goal setting, monitoring and review) to 191 patients over 6 months, while control pharmacies gave their usual care to 205 control patients. Both groups administered questionnaires and conducted spirometric testing at baseline and 6 months later. The main outcome measure was asthma severity/control status.
186 of 205 control patients (91%) and 165 of 191 intervention patients (86%) completed the study. The intervention resulted in improved asthma control: patients receiving the intervention were 2.7 times more likely to improve from “severe” to “not severe” than control patients (OR 2.68, 95% CI 1.64 to 4.37; p<0.001). The intervention also resulted in improved adherence to preventer medication (OR 1.89, 95% CI 1.08 to 3.30; p = 0.03), decreased mean daily dose of reliever medication (difference −149.11 μg, 95% CI −283.87 to −14.36; p = 0.03), a shift in medication profile from reliever only to a combination of preventer, reliever with or without long‐acting β agonist (OR 3.80, 95% CI 1.40 to 10.32; p = 0.01) and improved scores on risk of non‐adherence (difference −0.44, 95% CI −0.69 to −0.18; p = 0.04), quality of life (difference −0.23, 95% CI −0.46 to 0.00; p = 0.05), asthma knowledge (difference 1.18, 95% CI 0.73 to 1.63; p<0.01) and perceived control of asthma questionnaires (difference −1.39, 95% CI −2.44 to −0.35; p<0.01). No significant change in spirometric measures occurred in either group.
A pharmacist‐delivered asthma care programme based on national guidelines improves asthma control. The sustainability and implementation of the programme within the healthcare system remains to be investigated.
Micro(mi)RNAs are a class of small non-coding RNAs that play critical roles in the induction of various cancers, including lymphomas induced by oncogenic viruses. While some of the miRNAs are oncogenic, miRNAs such as miR-26a are consistently downregulated in a number of cancers, demonstrating their potential tumor suppressor functions. Global miRNA expression profiles of a number of virus-transformed avian lymphoma cell lines have shown downregulation of gga-miR-26a expression, irrespective of molecular mechanisms of transformation or the viral aetiology. The neoplastic transformation of lymphocytes by many viruses accompanies high levels of proliferative responses, mostly mediated through cytokines such as IL-2. Chicken IL-2 can modulate T-cell proliferation and cytotoxicity in vitro and in vivo and dysregulation of IL-2 expression is observed in diseases such as leukaemia.
The expression levels of gga-miR-26a in chicken lymphoma cells transformed by 3 distinct avian oncogenic viruses, viz Marek's disease virus (MDV), avian leukosis virus (ALV) and Reticuloendotheliosis virus (REV) were consistently downregulated compared to the levels in the normal lymphocytes. This downregulation of miR-26a regardless of the viral etiology and molecular mechanisms of transformation was consistent with the tumor suppressor role of this miRNA. Notwithstanding this well-established role in cancer, we demonstrate the additional role of this miRNA in directly targeting chicken IL-2 through reporter and biochemical assays. The downregulation of miR-26a can relieve the suppressive effect of this miRNA on IL-2 expression.
We show that miR-26a is globally downregulated in a number of avian lymphoma cells irrespective of the mechanisms of transformation, reiterating the highly conserved tumor suppressor function of this miRNA. However, with the potential for directly targeting chicken IL-2, the downregulation of miR-26a in these tumor cells could relieve the inhibitory effect on IL-2 expression assisting in the proliferative features of the transformed lymphocyte lines.
Marek's disease virus (MDV) is a lymphotropic alphaherpesvirus that induces fatal rapid-onset T-cell lymphomas in chickens, its natural host. The MDV-encoded nuclear oncoprotein Meq is essential for lymphomagenesis and acts as a regulator of transcription. Meq has structural features, including a basic domain adjacent to a leucine zipper motif (B-ZIP), that suggest it is related to the Jun/Fos family of transcription factors. Via the leucine zipper, Meq can form homodimers or heterodimerize with c-Jun. Meq/Meq homodimers are associated with transrepression, and Meq/Jun heterodimers can transactivate target genes carrying an AP-1-like binding site. In order to determine the role of the leucine zipper and of Meq dimerization in T lymphomagenesis, specific point mutations were engineered into the highly oncogenic RB-1B strain of MDV to produce virus completely lacking a functional Meq leucine zipper (RB-1B MeqBZIP/BZIP) or virus encoding Meq that cannot homodimerize but can still bind to c-Jun and an AP-1-like site on DNA (RB-1B MeqHom/Hom). Both of these mutant viruses were capable of replication in cultured chicken embryo fibroblasts. However both mutations resulted in a complete loss of oncogenicity, since no lymphomas were produced up to 90 days postinfection in experimentally infected chicks. We conclude that the leucine zipper is necessary for the oncogenic activity of Meq and/or the efficient establishment of long-term MDV latency in T cells. Moreover, it appears that the ability to form homodimers is an absolute requirement and the ability to bind c-Jun alone is insufficient for the T-cell lymphomagenesis associated with virulent MDV.
Herpesviruses account for 134 out of the 140 virus-encoded microRNAs (miRNAs) known today. Here we report the identification of 11 novel miRNAs encoded by herpesvirus of turkey (HVT), a virus used as a live vaccine in poultry against the highly oncogenic Marek's disease virus type 1. Ten of these miRNAs were clustered together within the repeat long region of the viral genome, demonstrating some degree of positional conservation with other mardiviruses. Close sequence and phylogenetic relationships of some miRNAs in this cluster indicate evolution by duplication. HVT miRNAs represent the first example of virus-encoded miRNAs that show evolution by duplication.
In this study, we have identified an internal ribosome entry site (IRES) from the highly infectious herpesvirus Marek's disease virus (MDV). The IRES was mapped to the intercistronic region (ICR) of a bicistronic mRNA that we cloned from the MDV-transformed CD4+ T-cell line MSB-1. The transcript is a member of a family of mRNAs expressed as immediate-early genes with two open reading frames (ORF). The first ORF encodes a 14-kDa polypeptide with two N-terminal splice variants, whereas the second ORF is contained entirely within a single exon and encodes a 12-kDa protein also known as RLORF9. We have shown that the ICR that separates the two ORFs functions as an IRES that controls the translation of RLORF9 when cap-dependent translation is inhibited. Deletion analysis revealed that there are two potential IRES elements within the ICR. Reverse genetic experiments with the oncogenic strain of MDV type 1 indicated that deletion of IRES-controlled RLORF9 does not significantly affect viral replication or MDV-induced mortality.
To assess undergraduate and postgraduate pharmacy students' perceptions of plagiarism and academic honesty.
A questionnaire was administered to undergraduate and postgraduate pharmacy students to determine their levels of awareness of university policy concerning academic honesty; attitudes to plagiarism by rating the acceptability of a range of plagiarizing and cheating practices; and choice of appropriate penalties for a first and second occurrence. The choice of behaviors in response to a scenario about the preparation of a reading-based written assignment and the strategies that students would be prepared to use in order to submit the assignment on time were also assessed.
Findings indicated widespread deficiencies in student knowledge of, and attitudes towards, plagiarism. Students did not perceive plagiarism as a serious issue and the use of inappropriate strategies for sourcing and acknowledging material was common.
The study highlights the importance of achieving a balance among the 3 dimensions of plagiarism management: prevention, detection and penalty.
academic honesty; plagiarism; cheating; Australia
Kaposi's sarcoma-associated herpesvirus-encoded microRNA (miRNA) MiR-K12-11 was recently shown to be a functional ortholog of miR-155, a miRNA that plays a major role in lymphoid malignancies and the modulation of immune responses. Here we show that miR-M4, encoded by the highly oncogenic Marek's disease virus of chickens, shares common targets with miR-155 and thus is also a functional ortholog of miR-155, the first one identified in an alphaherpesvirus. The observation that two distinct oncogenic herpesviruses associated with distinct types of lymphomas in different species encode functional miR-155 orthologs suggested the importance of this miRNA in regulatory pathways and the biology of lymphomagenesis.
To identify best practices in global pharmacy education and curriculum design as the basis for decisions about major curriculum change in an existing 4-year bachelor of pharmacy curriculum.
We investigated international best-practice standards, conducted semi-structured interviews with faculty members, and used standardized instruments to investigate student perceptions of the existing curriculum and how they approached their learning.
Faculty recommendations included horizontal and vertical integration of curriculum content to replace the previous discipline-based approach; and a theme-based structure underpinned by a detailed statement of learning outcomes that describe the knowledge, skills, and attitudinal milestones to be achieved each year and by the time of graduation. The triangulation of student survey data highlighted issues that needed to be addressed at the individual course unit level, with a particular focus on feedback, assessment, and workload.
The results of the curriculum review provided clear guidance for decisions relating to major curriculum change. An ongoing program of staff development will address the wide range of learning and teaching issues identified by both staff members and students. The results of our investigation of students' approaches to learning will also be used to guide staff development workshops, focusing on strategies to promote “meaningful learning.”
curriculum review; curriculum; bachelor of pharmacy degree; best practices
Research over the last few years has demonstrated the increasing role of microRNAs (miRNAs) as major regulators of gene expression in diverse cellular processes and diseases. Several viruses, particularly herpesviruses, also use the miRNA pathway of gene regulation by encoding their own miRNAs. Marek's disease (MD) is a widespread lymphomatous neoplastic disease of poultry caused by the highly contagious Marek's disease virus type 1 (MDV-1). Recent studies using virus-infected chicken embryo fibroblasts have identified at least eight miRNAs that map to the RL/RS region of the MDV genome. Since MDV is a lymphotropic virus that induces T-cell lymphomas, analysis of the miRNA profile in T-cell lymphoma would be more relevant for examining their role in oncogenesis. We determined the viral and host miRNAs expressed in MSB-1, a lymphoblastoid cell line established from an MDV-induced lymphoma of the spleen. In this paper, we report the identification of 13 MDV-1-encoded miRNAs (12 by direct cloning and 1 by Northern blotting) from MSB-1 cells. These miRNAs, five of which are novel MDV-1 miRNAs, map to the Meq and latency-associated transcript regions of the MDV genome. Furthermore, we show that miRNAs encoded by MDV-1 and the coinfected MDV-2 accounted for >60% of the 5,099 sequences of the MSB-1 “miRNAome.” Several chicken miRNAs, some of which are known to be associated with cancer, were also cloned from MSB-1 cells. High levels of expression of MDV-1-encoded miRNAs and potentially oncogenic host miRNAs suggest that miRNAs may have major roles in MDV pathogenesis and neoplastic transformation.
Cloning of full length genomes of herpesviruses as bacterial artificial chromosomes (BAC) has greatly facilitated the manipulation of the genomes of several herpesviruses to identify the pathogenic determinants. We have previously reported the construction of the BAC clone (pRB-1B5) of the highly oncogenic Marek's disease virus (MDV) strain RB-1B, which has proven to be a valuable resource for elucidating several oncogenic determinants. Despite the retention of the BAC replicon within the genome, the reconstituted virus was able to induce tumours in susceptible chickens. Nevertheless, it was unclear whether the presence of the BAC influenced the full oncogenic potential of the reconstituted virus. To maximize the closeness of BAC-derived virus to the parental RB-1B strain, we modified the existing pRB-1B5 clone by restoring the Us2 and by introducing SV40-cre cassette within the loxP sites of the mini-F plasmid, to allow self-excision of the plasmid sequences in chicken cells. The reconstituted virus from the modified clone showed significant improvement in replication in vitro and in vivo. Excision of the BAC sequences also enhanced the pathogenicity to levels similar to that of the parental virus, as the cumulative incidence of Marek's disease in groups infected with the recombinant and the parental viruses showed no significant differences. Thus, we have been able to make significant improvements to the existing BAC clone of this highly oncogenic virus which would certainly increase its usefulness as a valuable tool for studies on identifying the oncogenic determinants of this major avian pathogen.