ABSTRACT
OBJECTIVE: Pregnant women with gestational diabetes mellitus (GDM) are 50% more likely to develop type II diabetes (T2D) within 6 months to 2 years after giving birth. Therefore, international guidelines recommend it is best practice for women diagnosed with GDM to attend screening for T2D 6-12 weeks postpartum and every 1-3 years thereafter for life. However, uptake of postpartum screening is suboptimal. This study will explore the facilitators of and barriers to attending postpartum screening for T2D that women experience. STUDY DESIGN: This was a prospective qualitative cohort study using thematic analysis. METHODS: A total of 27 in-depth, semistructured interviews were conducted over the telephone with women who had recent GDM. Interviews were recorded and transcribed, and data were analysed using thematic analysis. RESULTS: Facilitators of and barriers to attending postpartum screening were identified at three different levels: personal, intervention, and healthcare systems level. The most common facilitators identified were concern for their own health and having the importance of screening explained to them by a health professional. The most common barriers identified were confusion over the test and COVID-19. CONCLUSION: This study identified several facilitators of and barriers to attending postpartum screening. These findings will help to inform research and interventions for improving rates of attendance at postpartum screening to reduce the subsequent risk of developing T2D.
Subject(s)
COVID-19 , Diabetes Mellitus, Type 2 , Diabetes, Gestational , Pregnancy , Female , Humans , Diabetes, Gestational/diagnosis , Diabetes, Gestational/epidemiology , Diabetes Mellitus, Type 2/diagnosis , Diabetes Mellitus, Type 2/epidemiology , Prospective Studies , Cohort Studies , COVID-19/complications , Postpartum PeriodABSTRACT
BACKGROUND: The internationalisation of higher level education and the profiles - nationalities, ethnicities and cultural identities - of students who migrate to undertake higher level education programmes in a different country are increasingly complex. This article explores the way in which cultural backgrounds impact the student's experiences of an international medical school, and how these experiences have the potential to inform the development and design of student support services for those students who are not coping well with the transition. METHODS: Thirty one first year students were interviewed by sixteen second year students who were trained and supervised by an experienced researcher. Three focus group discussions were also held. RESULTS: While many international students had lived in more than one country and region and spoke several languages, most reported difficulties in forming intercultural friendships, especially interactions outside of the academic setting. Some of the challenges faced were similar to what has been reported in the literature, such as difficulties with language and loss of established friendship networks. Other challenges to emerge in this study were the complex interrelatedness of the daily life challenges facing international students regarding the forming and importance of intercultural relations, which is impacted by gender, the presence of alcohol, languages spoken (in addition to English, which was the language used for medical education), and the dominance of the regional grouping the student belongs to. CONCLUSION: The challenges of adaptation and intercultural relations are increasing in complexity and it is important for higher level institutions who enrol international students to understand the nature of the pressures these students experience, outside as well as within the academic environment, and to support them in managing these transitions.
Subject(s)
Attitude of Health Personnel/ethnology , Cultural Diversity , Education, Medical, Undergraduate/standards , Schools, Medical , Social Adjustment , Students, Medical/psychology , Acculturation , Adaptation, Psychological , Culture , Female , Focus Groups , Humans , Interpersonal Relations , Male , Qualitative ResearchABSTRACT
Introduction This study aimed to analyse antibiotic prescribing in cases of upper respiratory tract infection (URTI) in children under 6 years attending Irish daytime and out-of-hours General Practice (GP) services. There have been large scale changes in entitlements for free GP care for this group in recent years. Methods A cross-sectional study of children under 6 years with URTI presentations was performed, over a two-week period for three years from 2015 to 2017. Factors associated with antibiotic prescription and preferred antibiotic compliance were examined using multivariate logistic regression. Results 1,007 Under-6 patients presented with an URTI in our sample over the study period. Following introduction of free GP care, patients were 50% less likely to receive an antibiotic prescription. Overall antibiotic prescribing fell from 70% to 50% in daytime services and from 72% to 60% in the out-of-hours setting. Patients presenting to out-of-hours services were more likely to receive an antibiotic (OR: 1.42) and less likely to receive a deferred antibiotic (OR: 0.53). One quarter to one third of all prescriptions were for deferred antibiotics. Year-on-year trends showed a 13% decrease in prescriptions and 13% increase in preferred antibiotic use. Conclusion The introduction of free GP care led to significant reductions in antibiotic prescribing, which may be due to changes in health seeking behaviour by parents or other reasons. Antibiotic prescribing was more commonplace in the out-of-hours setting, and rates remains high by international standards. This study underlines the importance of ongoing work around GP antimicrobial stewardship, particularly in the out-of-hours setting.
Subject(s)
Anti-Bacterial Agents/administration & dosage , Antimicrobial Stewardship/statistics & numerical data , Drug Prescriptions/statistics & numerical data , General Practice/statistics & numerical data , Respiratory Tract Infections/drug therapy , After-Hours Care/statistics & numerical data , Child , Child, Preschool , Cross-Sectional Studies , Female , Health Behavior , Humans , Infant , Ireland/epidemiology , Logistic Models , Male , Parents/psychology , Time FactorsABSTRACT
Background: We propose that arts based methodologies can be of value in the production and exchange of evidence in supporting public health related policy. This article reports on a collaborative piece of work resulting from two projects which took place in a former coal mining town in South Wales. Methods: We used a participatory framework whereby researchers, community members and artists co-produced 'evidence' through the creative arts to inform public policy. We collected a range of data using a number of different techniques, including interviews, focus groups and observation, but also included an extensive range of creative activities. Results: The data provided a diverse range of perspectives on how people of different ages live their lives. The People's Platform was a performance-based debate which was the culmination of the collaboration. The show involved a series of short performances with time for facilitated discussion in-between. It was felt that the show facilitated knowledge exchange on health and wellbeing issues that are usually difficult to express and understand through traditional forms of evidence. Conclusion: Whilst arts-based approaches are not free from risk, they offer an alternative form of knowledge as a necessary complement to the range of data available to policy makers.
Subject(s)
Art , Evidence-Based Practice , Public Health Practice , Adult , Evidence-Based Practice/methods , Humans , Interviews as Topic , Policy Making , Public Policy , Residence Characteristics , WalesABSTRACT
The hypothesis that the S allele of the 5-HTTLPR serotonin transporter promoter region is associated with increased risk of depression, but only in individuals exposed to stressful situations, has generated much interest, research and controversy since first proposed in 2003. Multiple meta-analyses combining results from heterogeneous analyses have not settled the issue. To determine the magnitude of the interaction and the conditions under which it might be observed, we performed new analyses on 31 data sets containing 38 802 European ancestry subjects genotyped for 5-HTTLPR and assessed for depression and childhood maltreatment or other stressful life events, and meta-analysed the results. Analyses targeted two stressors (narrow, broad) and two depression outcomes (current, lifetime). All groups that published on this topic prior to the initiation of our study and met the assessment and sample size criteria were invited to participate. Additional groups, identified by consortium members or self-identified in response to our protocol (published prior to the start of analysis) with qualifying unpublished data, were also invited to participate. A uniform data analysis script implementing the protocol was executed by each of the consortium members. Our findings do not support the interaction hypothesis. We found no subgroups or variable definitions for which an interaction between stress and 5-HTTLPR genotype was statistically significant. In contrast, our findings for the main effects of life stressors (strong risk factor) and 5-HTTLPR genotype (no impact on risk) are strikingly consistent across our contributing studies, the original study reporting the interaction and subsequent meta-analyses. Our conclusion is that if an interaction exists in which the S allele of 5-HTTLPR increases risk of depression only in stressed individuals, then it is not broadly generalisable, but must be of modest effect size and only observable in limited situations.
Subject(s)
Depression/genetics , Depression/psychology , Serotonin Plasma Membrane Transport Proteins/genetics , Stress, Psychological/complications , Cooperative Behavior , Gene-Environment Interaction , Genetic Predisposition to Disease , Genotype , Humans , Life Change Events , Stress, Psychological/geneticsABSTRACT
The diathesis-stress theory for depression states that the effects of stress on the depression risk are dependent on the diathesis or vulnerability, implying multiplicative interactive effects on the liability scale. We used polygenic risk scores for major depressive disorder (MDD) calculated from the results of the most recent analysis from the Psychiatric Genomics Consortium as a direct measure of the vulnerability for depression in a sample of 5221 individuals from 3083 families. In the same we also had measures of stressful life events and social support and a depression symptom score, as well as DSM-IV MDD diagnoses for most individuals. In order to estimate the variance in depression explained by the genetic vulnerability, the stressors and their interactions, we fitted linear mixed models controlling for relatedness for the whole sample as well as stratified by sex. We show a significant interaction of the polygenic risk scores with personal life events (0.12% of variance explained, P-value=0.0076) contributing positively to the risk of depression. Additionally, our results suggest possible differences in the aetiology of depression between women and men. In conclusion, our findings point to an extra risk for individuals with combined vulnerability and high number of reported personal life events beyond what would be expected from the additive contributions of these factors to the liability for depression, supporting the multiplicative diathesis-stress model for this disease.
Subject(s)
Depressive Disorder, Major/diagnosis , Depressive Disorder, Major/genetics , Adult , Depression/diagnosis , Depression/genetics , Depressive Disorder, Major/etiology , Disease Susceptibility , Female , Gene-Environment Interaction , Genetic Predisposition to Disease/genetics , Genome-Wide Association Study/methods , Humans , Life Change Events , Male , Middle Aged , Multifactorial Inheritance/genetics , Risk FactorsABSTRACT
Borderline personality disorder (BOR) is determined by environmental and genetic factors, and characterized by affective instability and impulsivity, diagnostic symptoms also observed in manic phases of bipolar disorder (BIP). Up to 20% of BIP patients show comorbidity with BOR. This report describes the first case-control genome-wide association study (GWAS) of BOR, performed in one of the largest BOR patient samples worldwide. The focus of our analysis was (i) to detect genes and gene sets involved in BOR and (ii) to investigate the genetic overlap with BIP. As there is considerable genetic overlap between BIP, major depression (MDD) and schizophrenia (SCZ) and a high comorbidity of BOR and MDD, we also analyzed the genetic overlap of BOR with SCZ and MDD. GWAS, gene-based tests and gene-set analyses were performed in 998 BOR patients and 1545 controls. Linkage disequilibrium score regression was used to detect the genetic overlap between BOR and these disorders. Single marker analysis revealed no significant association after correction for multiple testing. Gene-based analysis yielded two significant genes: DPYD (P=4.42 × 10-7) and PKP4 (P=8.67 × 10-7); and gene-set analysis yielded a significant finding for exocytosis (GO:0006887, PFDR=0.019; FDR, false discovery rate). Prior studies have implicated DPYD, PKP4 and exocytosis in BIP and SCZ. The most notable finding of the present study was the genetic overlap of BOR with BIP (rg=0.28 [P=2.99 × 10-3]), SCZ (rg=0.34 [P=4.37 × 10-5]) and MDD (rg=0.57 [P=1.04 × 10-3]). We believe our study is the first to demonstrate that BOR overlaps with BIP, MDD and SCZ on the genetic level. Whether this is confined to transdiagnostic clinical symptoms should be examined in future studies.
Subject(s)
Bipolar Disorder/genetics , Borderline Personality Disorder/genetics , Depressive Disorder, Major/genetics , Schizophrenia/genetics , Adolescent , Adult , Aged , Case-Control Studies , Female , Genetic Predisposition to Disease , Genome-Wide Association Study , Genotype , Humans , Male , Middle Aged , Multifactorial Inheritance , Young AdultABSTRACT
Major depressive disorder (MDD) is a common, complex psychiatric disorder and a leading cause of disability worldwide. Despite twin studies indicating its modest heritability (~30-40%), extensive heterogeneity and a complex genetic architecture have complicated efforts to detect associated genetic risk variants. We combined single-nucleotide polymorphism (SNP) summary statistics from the CONVERGE and PGC studies of MDD, representing 10 502 Chinese (5282 cases and 5220 controls) and 18 663 European (9447 cases and 9215 controls) subjects. We determined the fraction of SNPs displaying consistent directions of effect, assessed the significance of polygenic risk scores and estimated the genetic correlation of MDD across ancestries. Subsequent trans-ancestry meta-analyses combined SNP-level evidence of association. Sign tests and polygenic score profiling weakly support an overlap of SNP effects between East Asian and European populations. We estimated the trans-ancestry genetic correlation of lifetime MDD as 0.33; female-only and recurrent MDD yielded estimates of 0.40 and 0.41, respectively. Common variants downstream of GPHN achieved genome-wide significance by Bayesian trans-ancestry meta-analysis (rs9323497; log10 Bayes Factor=8.08) but failed to replicate in an independent European sample (P=0.911). Gene-set enrichment analyses indicate enrichment of genes involved in neuronal development and axonal trafficking. We successfully demonstrate a partially shared polygenic basis of MDD in East Asian and European populations. Taken together, these findings support a complex etiology for MDD and possible population differences in predisposing genetic factors, with important implications for future genetic studies.
Subject(s)
Asian People/genetics , Depressive Disorder, Major/genetics , White People/genetics , Bayes Theorem , Case-Control Studies , China , Europe , Female , Genetic Predisposition to Disease , Humans , Male , Multifactorial Inheritance , Polymorphism, Single NucleotideABSTRACT
BACKGROUND: For most people, choice making is an everyday occurrence, but for adults with an intellectual disability (ID), such opportunities are often limited, if not, absent. Defining choice, and related opportunity capacity and supports continue to feature prominently in academic, practice and policy discourse within the field of ID as reflected in the range of measures available. This paper examines the factor analytic properties of an adapted 14-item choice inventory scale. METHOD: Presence and type of choice were recorded in wave 1 of the Intellectual Disability Supplement to the Irish Longitudinal Study on Ageing using a choice inventory scale adapted for the Irish context for 753 participants with ID over age 40 years. Analysis included both an exploratory and confirmatory factor analysis. Descriptive statistics on choice by type of living arrangement, type of interview (proxy, self or supported) and level of ID are presented. RESULTS: Exploratory factor analysis indicates good model fit when using both a 3-item and 4-item response with the 4-item version suggesting a two-factor model. Further exploration of this two-factor model through confirmatory factor analysis highlighted an improved fit for the 4-item model. Further improvement in model fit is found when four item pairs are co-varied within the model. CONCLUSION: Two broad types of choice were found to exist for adults with ID - everyday decisions and key life decisions. In addition, the factor analysis support for the inclusion of a 'no choice' response may help reduce the potential for missing data.
Subject(s)
Activities of Daily Living , Choice Behavior , Intellectual Disability/psychology , Psychometrics/instrumentation , Surveys and Questionnaires/standards , Adult , Aged , Factor Analysis, Statistical , Female , Humans , Male , Middle AgedABSTRACT
BACKGROUND: With the recognition of the need for research capacity strengthening for advancing health and development, this research capacity article explores the use of technology enhanced learning in the delivery of a collaborative postgraduate blended Master's degree in Malawi. Two research questions are addressed: (i) Can technology enhanced learning be used to develop health research capacity?, and: (ii) How can learning content be designed that is transferrable across different contexts? METHODS: An explanatory sequential mixed methods design was adopted for the evaluation of technology enhanced learning in the Masters programme. A number of online surveys were administered, student participation in online activities monitored and an independent evaluation of the programme conducted. RESULTS: Remote collaboration and engagement are paramount in the design of a blended learning programme and support was needed for selecting the most appropriate technical tools. Internet access proved problematic despite developing the content around low bandwidth availability and training was required for students and teachers/trainers on the tools used. Varying degrees of engagement with the tools used was recorded, and the support of a learning technologist was needed to navigate through challenges faced. CONCLUSION: Capacity can be built in health research through blended learning programmes. In relation to transferability, the support required institutionally for technology enhanced learning needs to be conceptualised differently from support for face-to-face teaching. Additionally, differences in pedagogical approaches and styles between institutions, as well as existing social norms and values around communication, need to be embedded in the content development if the material is to be used beyond the pilot resource-intensive phase of a project.
Subject(s)
Capacity Building/methods , International Cooperation , Inventions/trends , Learning , Software Design , Humans , Internet , Qualitative Research , Research Support as Topic/methods , Research Support as Topic/standards , Surveys and QuestionnairesABSTRACT
Anxiety disorders (ADs), namely generalized AD, panic disorder and phobias, are common, etiologically complex conditions with a partially genetic basis. Despite differing on diagnostic definitions based on clinical presentation, ADs likely represent various expressions of an underlying common diathesis of abnormal regulation of basic threat-response systems. We conducted genome-wide association analyses in nine samples of European ancestry from seven large, independent studies. To identify genetic variants contributing to genetic susceptibility shared across interview-generated DSM-based ADs, we applied two phenotypic approaches: (1) comparisons between categorical AD cases and supernormal controls, and (2) quantitative phenotypic factor scores (FS) derived from a multivariate analysis combining information across the clinical phenotypes. We used logistic and linear regression, respectively, to analyze the association between these phenotypes and genome-wide single nucleotide polymorphisms. Meta-analysis for each phenotype combined results across the nine samples for over 18 000 unrelated individuals. Each meta-analysis identified a different genome-wide significant region, with the following markers showing the strongest association: for case-control contrasts, rs1709393 located in an uncharacterized non-coding RNA locus on chromosomal band 3q12.3 (P=1.65 × 10(-8)); for FS, rs1067327 within CAMKMT encoding the calmodulin-lysine N-methyltransferase on chromosomal band 2p21 (P=2.86 × 10(-9)). Independent replication and further exploration of these findings are needed to more fully understand the role of these variants in risk and expression of ADs.
Subject(s)
Anxiety Disorders/genetics , Case-Control Studies , Genetic Association Studies/methods , Genetic Predisposition to Disease , Genetic Variation , Genome-Wide Association Study/methods , Genotype , Humans , Polymorphism, Single Nucleotide , Risk Factors , White People/geneticsABSTRACT
BACKGROUND: Information about treatment protocols, adverse effects and outcomes with intrapleural recombinant tissue plasminogen activator (rTPA) use in horses with fibrinous pleuropneumonia is limited. HYPOTHESIS/OBJECTIVES: Describe factors that contribute to clinical response and survival of horses treated with rTPA intrapleurally. ANIMALS: Horses with bacterial pneumonia and fibrinous pleural effusion diagnosed by ultrasonography, that were treated with rTPA intrapleurally. METHODS: Retrospective multicenter case series from 2007-2012. Signalment, history, clinical and laboratory evaluation, treatment, and outcome obtained from medical records. Regression analysis used to identify associations between treatments and outcomes. RESULTS: Thirty three hemithoraces were treated in 25 horses, with 55 separate treatments. Recombinant tissue plasminogen activator (375-20,000 µg/hemithorax) was administered 1-4 times. Sonographically visible reduction in fibrin mat thickness, loculations, fluid depth, or some combination of these was seen in 32/49 (65%) treatments. Response to at least 1 treatment was seen in 17/20 (85%) horses with sonographic follow-up evaluation after every treatment. Earlier onset of rTPA treatment associated with increased survival odds. No association was found between cumulative rTPA dose or number of rTPA doses and survival, development of complications, duration of hospitalization or total charges. Clinical evidence of hypocoagulability or bleeding was not observed. Eighteen horses (72%) survived to discharge. CONCLUSIONS AND CLINICAL IMPORTANCE: Treatment with rTPA appeared safe and resulted in variable changes in fibrin quantity and organization within the pleural space. Recombinant tissue plasminogen activator could be a useful adjunct to standard treatment of fibrinous pleuropneumonia, but optimal case selection and dosing regimen remain to be elucidated.
Subject(s)
Fibrinolytic Agents/therapeutic use , Horse Diseases/drug therapy , Pleuropneumonia, Contagious/drug therapy , Tissue Plasminogen Activator/therapeutic use , Animals , Anti-Bacterial Agents/therapeutic use , Female , Horse Diseases/diagnostic imaging , Horse Diseases/microbiology , Horse Diseases/mortality , Horses , Male , Pleuropneumonia, Contagious/diagnostic imaging , Pleuropneumonia, Contagious/microbiology , Pleuropneumonia, Contagious/mortality , Recombinant Proteins/therapeutic use , Retrospective Studies , Survival Analysis , Treatment Outcome , UltrasonographyABSTRACT
BACKGROUND: Few studies have addressed the challenges associated with international students as they adapt to studying medicine in a new host country. Higher level institutions have increasing numbers of international students commencing programmes. This paper explores the experiences of a cohort of students in the early years of medical school in Ireland, where a considerable cohort are from an international background. METHODS: A mixed exploratory sequential study design was carried out with medical students in the preclinical component of a five year undergraduate programme. Data for the qualitative phase was collected through 29 semi-structured interviews using the peer interview method. Thematic analysis from this phase was incorporated to develop an online questionnaire combined with components of the Student Adaptation to College Questionnaire and Student Integration Questionnaire. First year students were anonymously surveyed online. The Mokken Scaling procedure was used to investigate the students' experiences, both positive and negative. RESULTS: Three main themes are identified; social adjustment, social alienation and cultural alienation. The response rate for the survey was 49% (467 Respondents). The Mokken Scaling method identified the following scales (i) Positive experience of student life; (ii) Social alienation, which comprised of negative items about feeling lonely, not fitting in, being homesick and (iii) Cultural alienation, which included the items of being uncomfortable around cultural norms of dress and contact between the sexes. With the threshold set to H = 0.4. Subscales of the positive experiences of student life scale are explored further. CONCLUSIONS: Overall student adjustment to a western third level college was good. Students from regions where cultural distance is greatest reported more difficulties in adjusting. Students from these regions also demonstrate very good adaptation. Some students from the host country and more similar cultural backgrounds were also struggling. Acculturation is more complex than being associated with cultural distance and worthy of further exploration.
Subject(s)
Social Adjustment , Students, Medical/psychology , Acculturation , Culture , Female , Humans , Interviews as Topic , Ireland , Male , Schools, Medical , Social Isolation , Surveys and QuestionnairesABSTRACT
An association between lower educational attainment (EA) and an increased risk for depression has been confirmed in various western countries. This study examines whether pleiotropic genetic effects contribute to this association. Therefore, data were analyzed from a total of 9662 major depressive disorder (MDD) cases and 14,949 controls (with no lifetime MDD diagnosis) from the Psychiatric Genomics Consortium with additional Dutch and Estonian data. The association of EA and MDD was assessed with logistic regression in 15,138 individuals indicating a significantly negative association in our sample with an odds ratio for MDD 0.78 (0.75-0.82) per standard deviation increase in EA. With data of 884,105 autosomal common single-nucleotide polymorphisms (SNPs), three methods were applied to test for pleiotropy between MDD and EA: (i) genetic profile risk scores (GPRS) derived from training data for EA (independent meta-analysis on ~120,000 subjects) and MDD (using a 10-fold leave-one-out procedure in the current sample), (ii) bivariate genomic-relationship-matrix restricted maximum likelihood (GREML) and (iii) SNP effect concordance analysis (SECA). With these methods, we found (i) that the EA-GPRS did not predict MDD status, and MDD-GPRS did not predict EA, (ii) a weak negative genetic correlation with bivariate GREML analyses, but this correlation was not consistently significant, (iii) no evidence for concordance of MDD and EA SNP effects with SECA analysis. To conclude, our study confirms an association of lower EA and MDD risk, but this association was not because of measurable pleiotropic genetic effects, which suggests that environmental factors could be involved, for example, socioeconomic status.
Subject(s)
Depressive Disorder, Major , Educational Status , Polymorphism, Single Nucleotide/genetics , Adult , Aged , Cohort Studies , Depressive Disorder, Major/epidemiology , Depressive Disorder, Major/genetics , Depressive Disorder, Major/psychology , Estonia/epidemiology , Female , Gene-Environment Interaction , Genetic Association Studies , Genotype , Humans , Likelihood Functions , Male , Middle Aged , Netherlands/epidemiology , Odds Ratio , Psychiatric Status Rating Scales , Regression AnalysisABSTRACT
The use of eponyms is controversial. A distinction must be made between those doctors and scientists after whom disorders and syndromes are named in honour of their discoveries, and those whose discoveries were made as a result of maltreatment of defenceless prisoners, utilizing specimens from victims of Nazi extermination policies, and euthanasia victims of racial policies. The second group of scientists should have their names expunged from the historical record, and their deeds brought to the attention of their colleagues. We are not however advocating the abolition of eponyms in general, only tainted ones.
Subject(s)
Eponyms , Ethics, Medical , Humans , National Socialism , PhysiciansABSTRACT
Usual sleep duration is a heritable trait correlated with psychiatric morbidity, cardiometabolic disease and mortality, although little is known about the genetic variants influencing this trait. A genome-wide association study (GWAS) of usual sleep duration was conducted using 18 population-based cohorts totaling 47 180 individuals of European ancestry. Genome-wide significant association was identified at two loci. The strongest is located on chromosome 2, in an intergenic region 35- to 80-kb upstream from the thyroid-specific transcription factor PAX8 (lowest P=1.1 × 10(-9)). This finding was replicated in an African-American sample of 4771 individuals (lowest P=9.3 × 10(-4)). The strongest combined association was at rs1823125 (P=1.5 × 10(-10), minor allele frequency 0.26 in the discovery sample, 0.12 in the replication sample), with each copy of the minor allele associated with a sleep duration 3.1 min longer per night. The alleles associated with longer sleep duration were associated in previous GWAS with a more favorable metabolic profile and a lower risk of attention deficit hyperactivity disorder. Understanding the mechanisms underlying these associations may help elucidate biological mechanisms influencing sleep duration and its association with psychiatric, metabolic and cardiovascular disease.
Subject(s)
Dyssomnias/genetics , Sleep/genetics , Adult , Black or African American/genetics , Aged , Female , Genetic Association Studies , Genome-Wide Association Study , Humans , Male , Middle Aged , Polymorphism, Single Nucleotide , Self Report , White People/geneticsABSTRACT
Our understanding of major depressive disorder (MDD) has focused on the influence of genetic variation and environmental risk factors. Growing evidence suggests the additional role of epigenetic mechanisms influencing susceptibility for complex traits. DNA sequence within discordant monozygotic twin (MZT) pairs is virtually identical; thus, they represent a powerful design for studying the contribution of epigenetic factors to disease liability. The aim of this study was to investigate whether specific methylation profiles in white blood cells could contribute to the aetiology of MDD. Participants were drawn from the Queensland Twin Registry and comprised 12 MZT pairs discordant for MDD and 12 MZT pairs concordant for no MDD and low neuroticism. Bisulphite treatment and genome-wide interrogation of differentially methylated CpG sites using the Illumina Human Methylation 450 BeadChip were performed in WBC-derived DNA. No overall difference in mean global methylation between cases and their unaffected co-twins was found; however, the differences in females was significant (P=0.005). The difference in variance across all probes between affected and unaffected twins was highly significant (P<2.2 × 10⻹6), with 52.4% of probes having higher variance in cases (binomial P-value<2.2 × 10⻹6). No significant differences in methylation were observed between discordant MZT pairs and their matched concordant MZT (permutation minimum P=0.11) at any individual probe. Larger samples are likely to be needed to identify true associations between methylation differences at specific CpG sites.
Subject(s)
DNA Methylation/genetics , Depressive Disorder, Major/genetics , Diseases in Twins/genetics , Twins, Monozygotic/genetics , Anxiety Disorders/genetics , Anxiety Disorders/psychology , Depressive Disorder, Major/metabolism , Diseases in Twins/psychology , Female , Humans , Male , Neuroticism , Registries , Sex FactorsABSTRACT
BACKGROUND: The Laboratory modernisation process in Ireland will include point of care testing (POCT) as one of its central tenets. However, a previous baseline survey showed that POCT was under-resourced particularly with respect to information technology (IT) and staffing. AIMS: An audit was undertaken to see if POCT services had improved since the publication of National Guidelines and if such services were ready for the major changes in laboratory medicine as envisaged by the Health Service Executive. METHODS: The 15 recommendations of the 2007 Guidelines were used as a template for a questionnaire, which was distributed by the Irish External Quality Assessment Scheme. RESULTS: Thirty-nine of a possible 45 acute hospitals replied. Only a quarter of respondent hospitals had POCT committees, however, allocation of staff to POCT had doubled since the first baseline survey. Poor IT infrastructure, the use of unapproved devices, and low levels of adverse incident reporting were still major issues. CONCLUSIONS: Point of care testing remains under-resourced, despite the roll out of such devices throughout the health service including primary care. The present high standards of laboratory medicine may not be maintained if the quality and cost-effectiveness of POCT is not controlled. Adherence to national Guidelines and adequate resourcing is essential to ensure patient safety.