Publications by authors named "Joanna M Chustecki"

Eukaryotic nuclear genomes often encode distinct sets of translation machinery for function in the cytosol vs. organelles (mitochondria and plastids). This raises questions about why multiple translation systems are maintained even though they are capable of comparable functions and whether they evolve differently depending on the compartment where they operate.

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Pollen tubes consume a tremendous amount of energy and are the fastest-growing cells known in plants. Mitochondria are key organelles that supply energy and play important roles in modulating cellular redox homeostasis. Here, we found that endogenous NAD(P)H in Arabidopsis pollen tubes was spatially highly correlated with the distribution of mitochondria, both peaking in the subapex region.

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Article Synopsis
  • Plant mitochondria differ from those in animals and fungi, displaying unique characteristics like a fragmented state, rapid movement on actin, and specific metabolic features, along with a partial mtDNA genome that frequently recombines.* -
  • These mitochondria operate in a "social network," sharing resources and information through dynamic interactions that support cellular functions and help balance competing priorities within plant cells.* -
  • Understanding plant mitochondrial behavior offers insights applicable to other life forms and has significant implications for agriculture, highlighting its role in crop production and opportunities for optimizing these biological systems.*
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Mitochondria in plant cells usually contain less than a full copy of the mitochondrial DNA (mtDNA) genome. Here, we asked whether mitochondrial dynamics may allow individual mitochondria to 'collect' a full set of mtDNA-encoded gene products over time, by facilitating exchange between individuals akin to trade on a social network. We characterise the collective dynamics of mitochondria in hypocotyl cells using a recent approach combining single-cell time-lapse microscopy, video analysis and network science.

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Mitochondria and plastids power complex life. Why some genes and not others are retained in their organelle DNA (oDNA) genomes remains a debated question. Here, we attempt to identify the properties of genes and associated underlying mechanisms that determine oDNA retention.

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Article Synopsis
  • Mitochondria in plants and other eukaryotes form dynamic populations, but the exact benefits and influences of their collective behavior are still not completely understood.* -
  • The study focuses on the Arabidopsis msh1 mutant, which has compromised mitochondrial DNA maintenance, using advanced microscopy and analysis methods to observe changes in mitochondrial dynamics.* -
  • Findings reveal that msh1 mitochondria exhibit altered behavior, showing less even distribution and increased connectivity, potentially as a compensatory mechanism to maintain efficiency of organelle exchange under genetic stress.*
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Article Synopsis
  • Mitochondria in plant cells function as independent organelles that move and interact, but their dynamics and significance are not fully understood.
  • This study focuses on the mitochondrial networks in Arabidopsis thaliana, combining live imaging with individual-based modeling to analyze their behavior over time.
  • The researchers discovered a tradeoff between evenly distributing mitochondria and enabling them to interact effectively, optimizing cellular organization for efficient biochemical exchanges.
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Mitochondrial DNA (mtDNA) and plastid DNA (ptDNA) encode vital bioenergetic apparatus, and mutations in these organelle DNA (oDNA) molecules can be devastating. In the germline of several animals, a genetic "bottleneck" increases cell-to-cell variance in mtDNA heteroplasmy, allowing purifying selection to act to maintain low proportions of mutant mtDNA. However, most eukaryotes do not sequester a germline early in development, and even the animal bottleneck remains poorly understood.

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