302 research outputs found

    Critical analysis of the governance of the Sainte Luce Locally Managed Marine Area (LMMA), southeast Madagascar

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    The Marine Protected Area Governance (MPAG) framework is applied to critically assess the governance of the Sainte Luce Locally Managed Marine Area (LMMA), southeast Madagascar. Madagascar experiences rapid population growth, widespread poverty, corruption and political instability, which hinders natural resource governance. Community-based natural resource management (CBNRM) has been repeatedly employed to circumvent the lack of state capacity. This includes the LMMA model, which has rapidly proliferated, represented by MIHARI, Madagascar's LMMA network. The lobster fishing is the primary source of income for households in the impoverished community of Sainte Luce, one of the key landing sites in the regional export industry. However, fishers, industry actors and available data suggest a significant decline of local and regional stocks, likely due to over-exploitation driven by poverty and migration. In 2013, SEED Madagascar a UK NGO, worked to establish community-based fishery management in Sainte Luce, setting up a local management committee, which introduced a periodic no take zone (NTZ). Despite the community's efforts and some significant achievements, the efficacy of management is limited. To date, limited state support and the lack of engagement by actors throughout the value chain have hampered effective governance. The study reinforces the finding that resilient governance relies on a diversity of actors and the incentives they collectively employ. Here and elsewhere, there is a limit to what can be achieved by bottom-up approaches in isolation. Resilient management of marine resources in Madagascar relies on improving the capacity of community, state, NGO and industry actors to collectively govern resources

    What does Brexit mean for the UK social care workforce? Perspectives from the recruitment and retention frontline.

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    The UK's departure from the European Union (Brexit) is likely to result in greater immigration and employment restrictions on European Union/European Economic Area (EU/EEA) nationals within the United Kingdom. EU/EEA citizens constitute a significant proportion of the current social care workforce. Research evaluating the impact of Brexit on social care has highlighted potentially severe future workforce shortfalls, but has not engaged in detail with the experiences of social care personnel involved in day-to-day recruitment and retention activities. This article explores how social care managers evaluate Brexit's prospects for future workforce sustainability, through the prism of their organisation's workforce requirements. This qualitative study incorporated in-depth semi-structured interviews and questionnaire surveys with domiciliary and residential care managers. Data collection focused on an urban conurbation in south-west England, with demographic characteristics likely to make post-Brexit recruitment and retention in social care particularly challenging. A key finding is that, irrespective of whether they employ EU/EEA workers or not, research participants have deep concerns about Brexit's potential impact on the social care labour market. These include apprehensions about future restrictions on hiring EU/EEA nurses, as well as fears about increased competition for care staff and their organisation's future financial viability. This article amplifies the voices of managers as an under-researched group, bringing their perspectives on Brexit to bear on wider debates on social care workforce sustainability

    Genome editing in mitochondria corrects a pathogenic mtDNA mutation in vivo.

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    Mutations of the mitochondrial genome (mtDNA) underlie a substantial portion of mitochondrial disease burden. These disorders are currently incurable and effectively untreatable, with heterogeneous penetrance, presentation and prognosis. To address the lack of effective treatment for these disorders, we exploited a recently developed mouse model that recapitulates common molecular features of heteroplasmic mtDNA disease in cardiac tissue: the m.5024C>T tRNAAla mouse. Through application of a programmable nuclease therapy approach, using systemically administered, mitochondrially targeted zinc-finger nucleases (mtZFN) delivered by adeno-associated virus, we induced specific elimination of mutant mtDNA across the heart, coupled to a reversion of molecular and biochemical phenotypes. These findings constitute proof of principle that mtDNA heteroplasmy correction using programmable nucleases could provide a therapeutic route for heteroplasmic mitochondrial diseases of diverse genetic origin

    NADH Shuttling Couples Cytosolic Reductive Carboxylation of Glutamine with Glycolysis in Cells with Mitochondrial Dysfunction.

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    The bioenergetics and molecular determinants of the metabolic response to mitochondrial dysfunction are incompletely understood, in part due to a lack of appropriate isogenic cellular models of primary mitochondrial defects. Here, we capitalize on a recently developed cell model with defined levels of m.8993T>G mutation heteroplasmy, mTUNE, to investigate the metabolic underpinnings of mitochondrial dysfunction. We found that impaired utilization of reduced nicotinamide adenine dinucleotide (NADH) by the mitochondrial respiratory chain leads to cytosolic reductive carboxylation of glutamine as a new mechanism for cytosol-confined NADH recycling supported by malate dehydrogenase 1 (MDH1). We also observed that increased glycolysis in cells with mitochondrial dysfunction is associated with increased cell migration in an MDH1-dependent fashion. Our results describe a novel link between glycolysis and mitochondrial dysfunction mediated by reductive carboxylation of glutamine

    Linear mitochondrial DNA is rapidly degraded by components of the replication machinery.

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    Emerging gene therapy approaches that aim to eliminate pathogenic mutations of mitochondrial DNA (mtDNA) rely on efficient degradation of linearized mtDNA, but the enzymatic machinery performing this task is presently unknown. Here, we show that, in cellular models of restriction endonuclease-induced mtDNA double-strand breaks, linear mtDNA is eliminated within hours by exonucleolytic activities. Inactivation of the mitochondrial 5'-3'exonuclease MGME1, elimination of the 3'-5'exonuclease activity of the mitochondrial DNA polymerase POLG by introducing the p.D274A mutation, or knockdown of the mitochondrial DNA helicase TWNK leads to severe impediment of mtDNA degradation. We do not observe similar effects when inactivating other known mitochondrial nucleases (EXOG, APEX2, ENDOG, FEN1, DNA2, MRE11, or RBBP8). Our data suggest that rapid degradation of linearized mtDNA is performed by the same machinery that is responsible for mtDNA replication, thus proposing novel roles for the participating enzymes POLG, TWNK, and MGME1

    Energetic costs of cellular and therapeutic control of stochastic mitochondrial DNA populations.

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    The dynamics of the cellular proportion of mutant mtDNA molecules is crucial for mitochondrial diseases. Cellular populations of mitochondria are under homeostatic control, but the details of the control mechanisms involved remain elusive. Here, we use stochastic modelling to derive general results for the impact of cellular control on mtDNA populations, the cost to the cell of different mtDNA states, and the optimisation of therapeutic control of mtDNA populations. This formalism yields a wealth of biological results, including that an increasing mtDNA variance can increase the energetic cost of maintaining a tissue, that intermediate levels of heteroplasmy can be more detrimental than homoplasmy even for a dysfunctional mutant, that heteroplasmy distribution (not mean alone) is crucial for the success of gene therapies, and that long-term rather than short intense gene therapies are more likely to beneficially impact mtDNA populations

    ‘Stepping away from the computer and into the sweats': The construction and negotiation of exercise identities in a Norwegian public company

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    While research has found that a developed exercise identity enables individuals to view exercise participation as self- reinforcing, the social barriers to such exercise identity development and participation have not been fully addressed. The subsequent aim of this study was to explore some of the social complexities at play in terms of how company employees construct and manage their exercise identities within a work place setting. A case-study method was used to address the research issue over a nine-month period. The case to be studied included a sample of 72 employees from a Norwegian public company who participated in an on-going work-based exercise programme called ‘Exercise for all’. The principal means of data collection comprised participant observation, individual interviews and exercise logbooks. The data were subject to inductive analysis. The primary barriers to exercise participation included high levels of social comparison in a competitive working context, particularly in relation to ‘competent colleagues’, and feelings of guilt associated with partaking in ‘recreational’ activities during work hours. Strategies engaged with to overcome and negotiate such obstacles included justifying participation through a health-related discourse, and constructing a more distinct ‘worker-exerciser’ identity
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