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Abstract Introduction Lebanon is a middle-income country facing substantial fragility features. Its health profile shows a high burden of NCD morbidity and mortality. This paper intends to analyse the political economy of NCD prevention and control in Lebanon. Methods This study adopted a literature-based case study research design using a problem-driven political economy analysis framework. A total of 94 peer-reviewed articles and documents from the grey literature published before June 2019 were retrieved and analysed. Results Lebanon’s political instability and fragile governance negatively affect its capacity to adapt a Health-in-All-Policies approach to NCD prevention and enable the blocking of NCD prevention policies by opposed stakeholders. Recent economic crises limit the fiscal capacity to address health financing issues and resulting health inequities. NCD care provision is twisted by powerful stakeholders towards a hospital-centred model with a powerful private sector. Stakeholders like the MOPH, UN agencies, and NGOs have been pushing towards changing the existing care model towards a primary care model. An incremental reform has been adopted to strengthen a network of primary care centres, support them with health technologies and improve the quality of primary care services. Nevertheless, outpatient services that are covered by other public funds remain specialist-led without much institutional regulation. Conclusion Our study revealed a locked equilibrium in NCD prevention policymaking in Lebanon, but with an incremental progress in service delivery reforms towards a primary care model. Advocacy and close monitoring by policy entrepreneurs (such as civil society) could initiate and sustain the implementation of policy change and care model reforms.

Background Improving the adoption and implementation of policies to curb non-communicable diseases (NCDs) is a major challenge for better global health. The adoption and implementation of such policies remain deficient in various contexts, with limited insights into the facilitating and inhibiting factors. These policies have traditionally been treated as technical solutions, neglecting the critical influence of political economy dynamics. Moreover, the complex nature of these interventions is often not adequately incorporated into evidence for policy-makers. This study aims to systematically review and evaluate the factors affecting NCD policy adoption and implementation. Methods We conducted a complex systematic review of articles discussing the adoption and implementation of World Health Organization’s (WHO’s) “best buys” NCD policies. We identified political economy factors and constructed a causal loop diagram (CLD) program theory to elucidate the interplay between factors influencing NCD policy adoption and implementation. A total of 157 papers met the inclusion criteria. Results Our CLD highlights a central feedback loop encompassing three vital variables: (1) the ability to define, (re)shape, and pass appropriate policy into law; (2) the ability to implement the policy (linked to the enforceability of the policy and to addressing NCD local burden); and (3) ability to monitor progress, evaluate and correct the course. Insufficient context-specific data impedes the formulation and enactment of suitable policies, particularly in areas facing multiple disease burdens. Multisectoral collaboration plays a pivotal role in both policy adoption and implementation. Effective monitoring and accountability systems significantly impact policy implementation. The commercial determinants of health (CDoH) serve as a major barrier to defining, adopting, and implementing tobacco, alcohol, and diet-related policies. Conclusion To advance global efforts, we recommend focusing on the development of robust accountability, monitoring, and evaluation systems, ensuring transparency in private sector engagement, supporting context-specific data collection, and effectively managing the CDoH. A system thinking approach can enhance the implementation of complex public health interventions.

Abstract Nuclear factors rapidly scan the genome for their targets, but the role of nuclear organization in such search is uncharted. Here we analyzed how multiple factors explore chromatin, combining live-cell single-molecule tracking with multifocal structured illumination of DNA density. We find that factors displaying higher bound fractions sample DNA-dense regions more exhaustively. Focusing on the tumor-suppressor p53, we demonstrate that it searches for targets by alternating between rapid diffusion in the interchromatin compartment and compact sampling of chromatin dense regions. Efficient targeting requires balanced interactions with chromatin: fusing p53 with an exogenous intrinsically disordered region potentiates p53-mediated target gene activation at low concentrations, but leads to condensates at higher levels, derailing its search and downregulating transcription. Our findings highlight the role of disordered regions on factors search and showcase a powerful method to generate traffic maps of the eukaryotic nucleus to dissect how its organization guides nuclear factors action.

Abstract The ability of transcription factors to discriminate between different classes of binding sites associated with specific biological functions underpins effective gene regulation in development and homeostasis. How this is achieved is poorly understood. The microphthalmia-associated transcription factor MITF is a lineage-survival oncogene that plays a crucial role in melanocyte development and melanoma. MITF suppresses invasion, reprograms metabolism and promotes both proliferation and differentiation. How MITF distinguishes between differentiation and proliferation-associated targets is unknown. Here we show that compared to many transcription factors MITF exhibits a very long residence time which is reduced by p300/CBP-mediated MITF acetylation at K206. While K206 acetylation also decreases genome-wide MITF DNA-binding affinity, it preferentially directs DNA binding away from differentiation-associated CATGTG motifs toward CACGTG elements. The results reveal an acetylation-mediated switch that suppresses differentiation and provides a mechanistic explanation of why a human K206Q MITF mutation is associated with Waardenburg syndrome.

Ensuring the reproducibility of research is a multi-stakeholder effort that comes with challenges and opportunities for individual researchers and research communities, librarians, publishers, funders and service providers. These emerge at various steps of the research process, and, in particular, at the publication stage. Previous work by Knowledge Exchange highlighted that, while there is growing awareness among researchers, reproducible publication practices have been slow to change. Importantly, research reproducibility has not yet reached institutional agendas: this work seeks to highlight the rationale for libraries to initiate and/or step up their engagement with this topic, which we argue is well aligned with their core values and strategic priorities. We draw on secondary analysis of data gathered by Knowledge Exchange, focusing on the literature identified as well as interviews held with librarians. We extend this through further investigation of the literature and by integrating the findings of discussions held at the 2022 LIBER conference, to provide an updated picture of how libraries engage with research reproducibility. Libraries have a significant role in promoting responsible research practices, including transparency and reproducibility, by leveraging their connections to academic communities and collaborating with stakeholders like research funders and publishers. Our recommendations for libraries include: i) partnering with researchers to promote a research culture that values transparency and reproducibility, ii) enhancing existing research infrastructure and support; and iii) investing in raising awareness and developing skills and capacities related to these principles.

The atomic structures of metallic nanoparticles dictate their chemical and physical properties, making their structural study under different chemical environments of importance. Here, electron microscopy finds that silver nanoparticles primarily adopt an icosahedron structure under air exposure, while previous reports showed that the face-centred cubic isomer is favoured when the nanoparticles are kept in vacuum.

Abstract Background Due to pre-existing difficulties, refugees are especially susceptible to the negative effects of the pandemic; nonetheless, the pandemic’s effect on this group is still unclear. The purpose of this study was to determine the effects of the COVID-19 pandemic on the mental health of Palestine refugees in Gaza by identifying the role of social determinants. During the pandemic, the United Nations Relief and Works Agency for Palestine Refugees in the Near East (UNRWA) enacted a number of policies and measures. The purpose of this research was to assess their efficacy and acceptability. Methods This qualitative study took place between August and November 2020. Twenty-nine key-informant interviews were conducted remotely with UNRWA Headquarters, field and clinical staff in Gaza and with community members, aged ≥18 years and residing in Rafah and Jabalia camps. We sought informed consent verbally or via email. Data was coded based on the framework for social determinants of mental health. Results Interview results indicated that the relationship might be unidirectional, with COVID-19 causing the degradation of living conditions and vice versa, with living conditions exacerbating the COVID-19 situation by facilitating virus transmission. In other instances, the association between mental health determinants and COVID-19 might be bidirectional. In terms of experiencing violence and anxieties, women, children, and daily-paid employees were significantly more disadvantaged than other groups in the community. UNRWA modified its service delivery techniques in order to continue providing essential services. In general, UNRWA’s strategies throughout the pandemic were deemed beneficial, but insufficient to meet the needs of Gazans. Conclusion The pandemic highlights the need to go beyond disease treatment and prevention to address social determinants to improve refugees’ health and reduce their susceptibility to future shocks. UNRWA has rapidly implemented telemedicine and mental telehealth services, making it imperative to assess the efficacy of these novel approaches to provide care at a distance. A long-term option may be to employ a hybrid strategy, which combines online and in-person therapy.

Abstract Background Discussions of health system resilience and emergency management often highlight the importance of coordination and partnership across government and with other stakeholders. However, both coordination and partnership have been identified as areas requiring further research. This paper identifies characteristics and enablers of effective coordination for emergency preparedness and response, drawing on experience from different countries with a range of shocks, including floods, drought, and COVID-19. Methods The paper synthesises evidence from a set of reports related to research, evaluation and technical assistance projects, bringing together evidence from 11 countries in sub-Saharan Africa and South Asia. Methods for the original reports included primary data collection through interviews, focus groups and workshop discussions, analysis of secondary data, and document review. Reports were synthesised using a coding framework, and quality of evidence was considered for reliability of the findings. Results The reports highlighted the role played by coordination and partnership in preparedness and response, and identified four key areas that characterise and enable effective coordination. First, coordination needs to be inclusive, bringing together different government sectors and levels, and stakeholders such as development agencies, universities, the private sector, local leaders and civil society, with equitable gender representation. Second, structural aspects of coordination bodies are important, including availability of coordination structures and regular meeting fora; clear roles, mandates and sufficient authority; the value of building on existing coordination mechanisms; and ongoing functioning of coordination bodies, before and after crises. Third, organisations responsible for coordination require sufficient capacity, including staff, funding, communication infrastructure and other resources, and learning from previous emergencies. Fourth, effective coordination is supported by high-level political leadership and incentives for collaboration. Country experience also highlighted interactions between these components, and with the wider health system and governance architecture, pointing to the need to consider coordination as part of a complex adaptive system. Conclusion COVID-19 and other shocks have highlighted the importance of effective coordination and partnership across government and with other stakeholders. Using country experience, the paper identifies a set of recommendations to strengthen coordination for health system resilience and emergency management.

Antonio Gramsci e Célestin Freinet conceberam uma educação democrática e libertadora, voltada para atender às necessidades das classes populares. Embora compartilhassem o mesmo objetivo, a escola moderna de Freinet e a escola unitária de Gramsci apresentavam metodologias distintas. Este artigo analisa e compara seus escritos, além de recorrer a outras pesquisas para destacar seus métodos pedagógicos em relação à realidade de sua aplicação. O presente estudo explora como as críticas de ambos os autores se complementam em suas propostas. Os desafios práticos, bem como a relevância de seus critérios educacionais, são abordados em consonância com a realidade histórica brasileira e suas necessidades sociais, para que a educação possa fornecer apoio efetivo. Reflete-se sobre as teorias de Gramsci e Freinet com base em seu objetivo comum de identificar na educação um caminho para uma sociedade igualitária, alcançando a libertação através do desenvolvimento do senso crítico.

Abstract Background Progress towards universal health coverage (UHC) is an inherently political process. Political economy analysis (PEA) is gaining momentum as a tool to better understand the role of the political and economic dimensions in shaping and achieving UHC in different contexts. Despite the acknowledged importance of actors and stakeholders in political economy considerations, their role in the PEA research process beyond “study subjects” as potential cocreators of knowledge and knowledge users has been overlooked so far. We therefore aimed to review the approaches with reference to stakeholder engagement during the research process adopted in the current published research on the political economy of UHC and health financing reforms, and the factors favouring (or hindering) uptake and usability of PEA work. Methods We reviewed the literature to describe whether, when and how stakeholders were involved in the research process of studies looking at the political economy of UHC and health financing reforms, and to identify challenges and lessons learned on effective stakeholder engagement and research uptake. We used a standardized search strategy with key terms across several databases; we screened and included articles that focused on PEA and UHC. Additionally, we conducted a short survey of the authors of the included studies to complement the information retrieved. Results Fifty articles met the inclusion criteria and were included in the analysis. We found overall little evidence of systematic engagement of stakeholders in the research process, which focused mostly on the data collection phase of the research (i.e., key informant interviews). Our study identifies some reasons for the varying stakeholder engagement. Challenges include PEA requiring specific skills, a focus on sensitive issues, and the blurriness in researchers’ and stakeholders’ roles and the multiple roles of stakeholders as research participants, study subjects and research users. Among the approaches that might favour usability of PEA work, we identified early engagement, coproduction of research questions, local partners and personal contact, political willingness, and trust and use of prospective analysis. Conclusions Stakeholder engagement and research uptake are multifaceted concepts and complex processes, particularly when applied to PEA. As such, stakeholder engagement in the research process of PEA of UHC and health financing reforms is limited and underreported. Despite the challenges, however, stakeholder engagement remains key to ensuring relevance, usability and research uptake of PEA studies. More efforts are required to ensure engagement at different stages of the research process and better reporting in published articles.

Abstract Qualitative comparative analysis (QCA) is a relatively new method that examines causal complexity. Its use in mental health research is nascent. In low-income and fragile settings, with weak mental health service provision, identifying pathways of recovery from psychological distress can inform the appropriate deployment of scarce community and public resources. This paper examines the use of QCA to identify predictors of recovery in Sierra Leone. Our study explored lay perceptions of the signs of recovery from psychological distress caused by such events as the loss of a family member, severe sickness, and loss of a relationship. The data drew upon 75 interviews with women and men, across four districts of Sierra Leone, who described the signs of recovery from psychological distress they have observed in one person known to them. The truth table generated through QCA software indicated two signs of recovery— work/study and healthy relations—to be the most prevalent across different combinations of predictive factors. Further analysis of the truth table and sub-set relations suggested that work/study and healthy relations frequently served as sufficient conditions for reported recovery from distress to occur. QCA provided a means to identify sufficient predictive factors for recovery from psychological distress to occur. The findings suggest that to enable recovery from psychological distress, support needs to be broad and bring together services that will enable individuals to improve their social and relational wellbeing. Responses to distress need to involve a wide range of community-based stakeholders who will help individuals to engage in constructive activity and strengthen relations with their family members, friends, and the broader community. QCA is potentially well-positioned to unpack complexity in mental health research.

Abstract Background Noncommunicable diseases (NCDs), including mental health, have become a major concern in low- and middle-income countries. Despite increased attention to them over the past decade, progress toward addressing NCDs has been slow. A lack of bold policy commitments has been suggested as one of the contributors to limited progress in NCD prevention and management. However, the policies of key global actors (bilateral, multilateral, and not-for-profit organisations) have been understudied. Methods This study aimed to map the key global actors investing in action regarding NCDs and review their policies to examine the articulation of priorities regarding NCDs. Narrative synthesis of 70 documents and 31 policy papers was completed, and related to data collated from the Global Health Data Visualisation Tool. Results In 2019 41% of development assistance for health committed to NCDs came from private philanthropies, while that for other global health priorities from this source was just 20%. Through a range of channels, bilateral donors were the other major source of NCD funding (contributing 41% of NCD funding). The UK and the US were the largest bilateral investors in NCDs, each contributing 8%. However, NCDs are still under-prioritised within bilateral portfolios – receiving just 0.48% of US funding and 1.66% of the UK. NGOs were the key channels of funding for NCDs, spending 48% of the funds from donors in 2019. The reviewed literature generally focused on NCD policies of WHO, with policies of multilateral and bilateral donors given limited attention. The analysis of policies indicated a limited prioritisation of NCDs in policy documents. NCDs are framed in the policies as a barrier to economic growth, poverty reduction, and health system sustainability. Bilateral donors prioritise prevention, while multilateral actors offer policy options for NCD prevention and care. Even where stated as a priority, however, funding allocations are not aligned. Conclusion The growing threat of NCDs and their drivers are increasingly recognised. However, global actors’ policy priorities and funding allocations need to align better to address these NCD threats. Given the level of their investment and engagement, more research is needed into the role of private philanthropies and NGOs in this area.

Experiments on model surfaces commonly help in identifying the structural sensitivity of catalytic reactions. Nevertheless, their conclusions do not frequently lead to devising superior "real-world" catalysts. For instance, this is true for single-crystal platinum electrodes and the oxygen reduction reaction (ORR), an important reaction for sustainable energy conversion. Pt(111) is substantially enhanced by steps, reaching a maximum at short terrace lengths of 3-4 atoms. Conversely, regular platinum nanoparticles with similar undercoordinated defects are less active than Pt(111) and their activity increases alongside the terrace-to-defect ratio. We show here that a model to design ORR active sites on extended surfaces can also be used to solve this apparent contradiction and provide accurate design rules for nanoparticles. Essentially, only surfaces and nanostructures with concave defects can surpass the activity of Pt(111), whereas convex defects are inactive. Importantly, only the latter are present in regular nanoparticles, which is why we design various concave nanoparticles with high activities.

We performed an in-depth analysis of the virucidal effect of discrete wavelengths: UV-C (278 nm), UV-B (308 nm), UV-A (366 nm) and violet (405 nm) on SARS-CoV-2. By using a highly infectious titer of SARS-CoV-2 we observed that the violet light-dose resulting in a 2-log viral inactivation is only 104 times less efficient than UV-C light. Moreover, by qPCR (quantitative Polymerase chain reaction) and fluorescence in situ hybridization (FISH) approach we verified that the viral titer typically found in the sputum of COVID-19 patients can be completely inactivated by the long UV-wavelengths corresponding to UV-A and UV-B solar irradiation. The comparison of the UV action spectrum on SARS-CoV-2 to previous results obtained on other pathogens suggests that RNA viruses might be particularly sensitive to long UV wavelengths. Our data extend previous results showing that SARS-CoV-2 is highly susceptible to UV light and offer an explanation to the reduced incidence of SARS-CoV-2 infection seen in the summer season.

Abstract Background Evidence suggests wide variability in the provision of mental healthcare across countries. Countries experiencing fragility related risks suffer from a high burden of mental-ill health and additionally have limited capacity to scale up mental health services given financial and human resource shortages. Integration of mental health services into routine primary care is one potential strategy for enhancing service availability, however little is known about the experiences of currently active health care providers involved in mental health and psychosocial support service (MHPSS) provision at primary care level. This study aims to determine how healthcare providers offering MHPSS services at primary care levels in Lebanon perceive mental health and the health system’s ability to address the rising mental ill-health burden with a view to identify opportunities for strengthening MHPSS service implementation geared towards integrated person focused care model. Methods A qualitative study design was adopted including 15 semi-structured interviews and 2 participatory group model-building workshops with health care providers (HCPs) involved in mental healthcare delivery at primary care level. Participants were recruited from two contrasting fragility contexts (Beirut and Beqaa). During workshops, causal loop diagrams depicting shared understandings of factors leading to stress and mental ill health, associated health seeking behaviors, and challenges and barriers within the health system were elicited. This research is part of a larger study focused on understanding the dynamics shaping mental health perceptions and health seeking behaviours among community members residing in Lebanon. Results Findings are organized around a causal loop diagram depicting three central dynamics as described by workshop participants. First, participants linked financial constraints at household levels and the inability to secure one’s livelihood with contextual socio-political stressors, principally referring to integration challenges between host communities and Syrian refugees. In a second dynamic, participants linked exposure to war, conflict and displacement to the occurrence of traumatic events and high levels of distress as well as tense family and community relations. Finally, participants described a third dynamic linking cultural norms and patriarchal systems to exposure to violence and intergenerational trauma among Lebanon’s populations. When describing help-seeking pathways, participants noted the strong influence of social stigma within both the community and among health professionals; the latter was noted to negatively affect patient-provider relationships. Participants additionally spoke of difficulties in the delivery of mental health services and linked this to the design of the health system itself, noting the current system being geared towards patient centered care, which focuses on the patient’s experiences with a disease only, rather than person focused care where providers and patients acknowledge broader structural and social influences on health and work together to reach appropriate decisions for tackling health and other social needs. Barriers to delivery of person focused care include the lack of coherent mental health information systems, limited human capacity to deliver MHPSS services among primary health care staff and inadequate service integration and coordination among the many providers of mental health services in our study contexts. Critically however, provider accounts demonstrate readiness and willingness of health professionals to engage with integrated person focused care models of care. Conclusions Mental ill health is a major public health problem with implications for individual health and wellbeing; in a fragile context such as Lebanon, the burden of mental ill health is expected to rise and this presents substantive challenges for the existing health system. Concrete multi-sectoral efforts and investments are required to (1) reduce stigma and improve public perceptions surrounding mental ill health and associated needs for care seeking and (2) promote the implementation of integrated person focused care for addressing mental health.

Abstract Background Non-communicable diseases (NCD) present an increasing global health challenge, particularly for settings affected by fragility where access to care may be disrupted, and where high-quality continuous care delivery is difficult to achieve. This study documents the complex dynamics of NCD prevention and management in the fragile setting of rural Beqaa, Lebanon. Methods Participatory system dynamics methods were used, including 30 semi-structured interviews and three Group Model Building (GMB) workshops. Participants included health care providers offering NCD care, and Lebanese host- and Syrian refugees community members affected by NCDs. Results Participants across all groups articulated a shared complex understanding of both the structural and direct determinants behind NCD onset. Lebanese and Syrian community members further identified several barriers to health seeking, including restrictions in health coverage, limited availability of services in the Beqaa and perceptions of poor-quality care. Health providers and community members described a health system overtly focused on disease control and overwhelmed by delivery of care to people living with NCD across both communities. Conclusion Participants across all groups agreed on the need for health promotion and primary prevention activities and identified priority interventions in these areas.

Solvation can substantially modify the adsorption properties of heterogeneous catalysts. Although essential for achieving realistic theoretical models, assessing such solvent effects over nanoparticles is challenging from a computational standpoint due to the complexity of those liquid/metal interfaces. This effect is investigated by ab initio molecular dynamics simulations at 350 K of a large platinum nanoparticle immersed in liquid water. The first solvation layer contains twice as much physisorbed water molecules above the terraces, than chemisorbed ones located only at edges and corners. The solvent stabilizes the binding energy of chemisorbates: 66% of the total gain comes from interactions with physisorbed molecules and 34% from the influence of bulk liquid.

Abstract Background Available evidence on mental health and psychosocial problems in Lebanon is limited. Recent quantitative data suggests a high prevalence among Syrian refugees and their Lebanese host communities, with significant treatment gaps in both populations. This study aims to determine how Lebanese host and Syrian refugee communities perceive mental health, and identify health seeking behaviors and barriers to health access in two contrasting contexts of fragility. Methods A comparative qualitative study design was adopted whereby a total of 36 semi-structured interviews with Lebanese host and Syrian refugees’ community members were conducted, followed by a series of four participatory group model building (GMB) sessions. Participants were recruited from two contrasting fragility contexts: Beirut and Beqaa regions. During these sessions, causal loop diagrams were elicited depicting shared understandings of factors prompting the onset of mental health and psychosocial issues; health seeking behaviors, pathways and elements affecting the rate of health improvement and maintenance were also identified. Results Community members in both settings had similar perceptions of factors contributing to mental health. Participants named long-term effects of exposure to wars, political and social effects of conflicts, and financial constraints at the household level as precipitating factors prompting the onset of mental health and psychosocial stressors. Gender and integration related challenges between communities were identified as factors that affect condition onset and associated care seeking. Pathways for health seeking were found to be shaped by trust, the advice and support of loved ones, and the need to ensure confidentiality of affected individuals. Recurrent themes in discussion highlighted major barriers to healthcare access including significant delays in health care seeking from the formal health system, widespread social stigma, prohibitive service costs, lack of health coverage, limited awareness of mental health service availability and limited trust in the quality of services available. Conclusion Mental health and psychosocial support strategies need to be gender- and integration-sensitive, primarily focused on condition prevention and awareness raising in order to strengthen health-seeking behaviors.

The Libyan Ministry of Health is keen to understand how it can introduce policies to protect its population from non-communicable diseases (NCDs). We aimed to perform an implementation research assessment of the current situation, including challenges and opportunities. We used an explanatory sequential mixed methods design. We started with a quantitative assessment of NCD policy performance based on review of the WHO NCD Progress Monitor Reports. Once we had identified Libya's NCD policy gaps we performed a systematic review to identify international lessons around barriers and successful strategies for the policies Libya has not yet implemented. Finally, we performed a series of key stakeholder interviews with senior policymakers to explore their perspectives around promising policy actions. We used a realist paradigm, methods triangulation, and a joint display to synthesise the interpretation of our findings and develop recommendations. Libya has not fully implemented any of the recommended policies for diet, physical activity, primary care guidelines & therapeutics, or data collection, targets & surveillance. It does not have robust tobacco policies in place. Evidence from the international literature and policymaker interviews emphasised the centrality of according strong political leadership, governance structures, multisectoral engagement, and adequate financing to policy development activities. Libya's complex political and security situation are major barriers for policy implementation. Whilst some policies will be very challenging to develop and deploy, there are a number of simple policy actions that could be implemented with minimum effort; from inviting WHO to conduct a second STEPS survey, to signing the international code on breast-milk substitutes. Like many other fragile and conflict-affected states, Libya has not accorded NCDs the policy attention they demand. Whilst strong high-level leadership is the ultimate key to providing adequate protections, there are a range of simple measures that can be implemented with relative ease.

Cardiolipin is known to interact with bacterial and mitochondrial proteins and protein complexes. Unlike in Escherichia coli and Saccharomyces cerevisiae, the synthesis of cardiolipin is essential for growth of Trypanosoma brucei parasites in culture. Inhibition of cardiolipin production has been shown to result in major changes in the T. brucei proteome and energy metabolism, with CLDP43, a mitochondrial protein containing a StaR-related lipid transfer (START)-like domain, being depleted in a cardiolipin-dependent way. We now show that in T. brucei procyclic forms lacking CLDP43, cardiolipin metabolism and mitochondrial function are affected. Using quantitative and qualitative lipid analyses, we found that while steady-state levels of cardiolipin were elevated in CLDP43 knock-out parasites compared to parental cells, de novo formation of cardiolipin was down-regulated. In addition, depletion of CLDP43 resulted in partial loss of mitochondrial membrane potential and decreased ATP production via substrate level phosphorylation. Recombinant CLDP43 was found to bind cardiolipin and phosphatidic acid in lipid overlay experiments, suggesting that it may be involved in transport or synthesis of cardiolipin or its precursors in T. brucei.