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Research

Breakdown of mitochondrial proteostasis activates quality control pathways including the mitochondrial unfolded protein response (UPRmt) and PINK1/Parkin mitophagy. However, beyond the up-regulation of chaperones and proteases, we have a limited understanding of how the UPRmt remodels and restores damaged mitochondrial proteomes. 

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The ability to balance conflicting functional demands is critical for ensuring organismal survival. The transcription and repair of the mitochondrial genome requires separate enzymatic activities that can sterically compete, suggesting a life-long trade-off between these two processes.

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We report a role for the mitochondrial single-stranded DNA binding protein (mtSSB) in regulating mitochondrial DNA (mtDNA) replication initiation in mammalian mitochondria. Transcription from the light-strand promoter (LSP) is required both for gene expression and for generating the RNA primers needed for initiation of mtDNA synthesis.

Research

Mitochondrial ribosomes are specialized for the synthesis of membrane proteins responsible for oxidative phosphorylation. Mammalian mitoribosomes have diverged considerably from the ancestral bacterial ribosomes and feature dramatically reduced ribosomal RNAs. The structural basis of the mammalian mitochondrial ribosome assembly is currently not well understood. Here we present eight distinct assembly intermediates of the human large mitoribosomal subunit involving seven assembly factors.

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Expression of the compact mitochondrial genome is regulated by nuclear encoded, mitochondrially localized RNA-binding proteins (RBPs). RBPs regulate the lifecycles of mitochondrial RNAs from transcription to degradation by mediating RNA processing, maturation, stability and translation. The Fas-activated serine/threonine kinase (FASTK) family of RBPs has been shown to regulate and fine-tune discrete aspects of mitochondrial gene expression.

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Advances in omics technologies have generated exponentially larger volumes of biological data; however, their analyses and interpretation are limited to computationally proficient scientists. We created OmicsVolcano, an interactive open-source software tool to enable visualization and exploration of high-throughput biological data, while highlighting features of interest using a volcano plot interface. In contrast to existing tools, our software and user-interface design allow it to be used without requiring any programming skills to generate high-quality and presentation-ready images.

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The genetic code that specifies the identity of amino acids incorporated into proteins during protein synthesis is almost universally conserved. Mitochondrial genomes feature deviations from the standard genetic code, including the reassignment of two arginine codons to stop codons.

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The rarity of the mesenchymal stem cell (MSC) population poses a significant challenge for MSC research. Therefore, these cells are often expanded in vitro, prior to use. However, long-term culture has been shown to alter primary MSC properties.

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Programmable DNA endonucleases derived from bacterial genetic defense systems, exemplified by CRISPR-Cas9, have made it significantly easier to perform genomic modifications in living cells. However, unprogrammed, off-target modifications can have serious consequences, as they often disrupt the function or regulation of non-targeted genes and compromise the safety of therapeutic gene editing applications. 

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The discovery of CRISPR-Cas9 and its widespread use has revolutionised and propelled research in biological sciences.

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Self-compassion has emerged as a promising treatment target to promote healthy parent–child relationships, though mostly in maternal samples. The mechanisms through which self-compassion may optimise the father-child relationships are not yet well-established.

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People with intellectual disability are at risk of poor physical and mental health. Risks to health are compounded by poor health literacy, that is, reduced capacity to access health services, respond quickly to changes in health status and navigate care pathways. Building health literacy skills is a strength-based way to increase health and optimise the use of healthcare services. The internet is a primary source of health information for many people, including people with intellectual disability and their families. 

Research

Loneliness is an unavoidable facet of human existence. When chronic and intense, adolescent loneliness is associated with maladjustment over time. A prospective multiple-cohort study examined the links between child-reported loneliness and coping skills and parent-rated child mental health in early adolescence, with a total of 266 students from 75 primary and 152 secondary schools.

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This study investigates various common medical conditions affecting Australian children aged 4–14 years and the impact of prenatal and early-life conditions on these health conditions using a large national data set with 15 years of follow-up.

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Accurately screening fathers for perinatal mental health problems requires well-validated screening instruments that assess the expression of paternal perinatal mental distress. This study aimed to identify and describe the psychometric properties of perinatal mental health screening instruments administered to paternal cohorts within the past two decades. 

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Steve Zubrick FASSA, FAAMHS, MSc AM PhD Honorary Emeritus Research Fellow 08 6319 1409 Stephen.zubrick@thekids.org.au Honorary Emeritus Research

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Researchers have examined sub-groups that may exist among young people transitioning from out-of-home care (OHC) using various theoretical models. However, this population group has not been examined for trajectories of homelessness risk.

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Reducing the over-representation of Aboriginal children in the child protection system is a key target for the Australian government. We aimed to provide more recent evidence on the population-level cumulative incidence of contacts for Aboriginal children with child protective services in Western Australia.