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1.
  • Blondelle, Jordan, et al. (author)
  • Cullin-3-dependent deregulation of ACTN1 represents a pathogenic mechanism in nemaline myopathy
  • 2019
  • In: JCI Insight. - : American Society for Clinical Investigation. - 2379-3708. ; 4:10
  • Journal article (peer-reviewed)abstract
    • Nemaline myopathy is a congenital neuromuscular disorder characterized by muscle weakness, fiber atrophy, and presence of nemaline bodies within myofibers. However, understanding of the underlying pathomechanisms is lacking. Recently, mutations in KBTBD13, KLHL40, and KLHL41, three substrate adaptors for the E3 ubiquitin ligase Cullin-3, have been associated with early-onset nemaline myopathies. We hypothesized that deregulation of Cullin-3 and its muscle protein substrates may be responsible for disease development. Using Cullin-3-knockout mice, we identified accumulation of non-muscle α-actinins (ACTN1 and ACTN4) in muscles of these mice, which we also observed in patients with mutations in KBTBD13. Our data reveal that proper regulation of Cullin-3 activity and ACTN1 levels is essential for normal muscle and neuromuscular junction development. While ACTN1 is naturally downregulated during myogenesis, its overexpression in C2C12 myoblasts triggered defects in fusion, myogenesis, and acetylcholine receptor clustering - features that we characterized in Cullin-3-deficient mice. Taken together, our data highlight the importance of Cullin-3-mediated degradation of ACTN1 for muscle development, and indicate what is to our knowledge new pathomechanism for the etiology of myopathies seen in Cullin-3-knockout mice and patients with nemaline myopathy.
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2.
  • Folke, Carl, et al. (author)
  • Our future in the Anthropocene biosphere
  • 2021
  • In: Ambio. - : Springer Science and Business Media LLC. - 0044-7447 .- 1654-7209. ; 50:4, s. 834-869
  • Journal article (peer-reviewed)abstract
    • The COVID-19 pandemic has exposed an interconnected and tightly coupled globalized world in rapid change. This article sets the scientific stage for understanding and responding to such change for global sustainability and resilient societies. We provide a systemic overview of the current situation where people and nature are dynamically intertwined and embedded in the biosphere, placing shocks and extreme events as part of this dynamic; humanity has become the major force in shaping the future of the Earth system as a whole; and the scale and pace of the human dimension have caused climate change, rapid loss of biodiversity, growing inequalities, and loss of resilience to deal with uncertainty and surprise. Taken together, human actions are challenging the biosphere foundation for a prosperous development of civilizations. The Anthropocene reality-of rising system-wide turbulence-calls for transformative change towards sustainable futures. Emerging technologies, social innovations, broader shifts in cultural repertoires, as well as a diverse portfolio of active stewardship of human actions in support of a resilient biosphere are highlighted as essential parts of such transformations.
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