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Open research questions in Mitochondrial Function and Pathology

110 unresolved questions extracted from the limitations and future-work sections of 566 Mitochondrial Function and Pathology papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • Abstract Ionizing radiation (IR) elicits both cytotoxic and immunomodulatory effects, yet the precise link between mitochondrial remodeling and immunogenic cell death (ICD) remains elusive.

    Mitophagy-dependent mitochondrial DNA release links ionizing radiation to immunogenic cell death in pancreatic cancer · 2026 · DOI

  • Glioblastoma (GBM) remains one of the most therapy-resistant human malignancies, yet the physiological limits of mitochondrial stress adaptation against which its remarkable resilience might be interpreted remain poorly defined.

    Glioblastoma as Developmental Stress Boundary Displacement: Insect Embryonic Cells as Quantitative Reference Platforms for Mitochondrial Adaptation—A Conceptual Framework · 2026 · DOI

  • During mitochondrial dysfunction, the contact between the ER-resident protein VAPB and the outer mitochondrial membrane protein RMDN3 (PTPIP51) increases, yet the mechanism stabilizing this connection despite ongoing mitophagy remains to be determined.

    PINK1 stabilizes RMDN3-VAPB interaction without altering the landscape of mito-ER contact sites · 2026 · DOI

  • Although MSTO1 has been implicated in regulating mitochondrial fusion, the molecular function of this cytosolic protein in vertebrate cells remains unclear.

    MSTO1 functions as a TRiC assembly factor linking cytosolic proteostasis to mitochondrial function · 2026 · DOI

  • Diacylglycerol (DAG) is a simple yet critical lipid secondary messenger, but the regulatory mechanisms and functional implications for its distribution remain poorly understood.

    A lipid acyl code-based Dip2-Pkc1 signalling axis maintains mitochondrial integrity in eukaryotes · 2026 · DOI

  • However, it remains unclear whether OM‐MSC‐Exos can alleviate astrocyte senescence in PD by restoring mitochondrial function through the nuclear respiratory factor 1 (NRF1)‐mitochondrial transcription factor A (TFAM) pathway.

    Exosomal <scp>TGM2</scp> From Hypoxia‐Primed Olfactory Mucosa <scp>MSCs</scp> Attenuates Senescent Astrocytes via <scp>NRF1</scp> / <scp>TFAM</scp> Signaling in Parkinson's Disease · 2026 · DOI

  • Although gastrointestinal distress is both common and debilitating in individuals with autism spectrum disorder (ASD), underpinning mechanisms—and therefore effective management strategies—are not fully elucidated.

    Autism Spectrum Disorder: High-Resolution Elucidation of Mitochondrial Dysregulation in Larval Zebrafish Gut · 2026 · DOI

  • Mesenchymal stem cells (MSCs), which can mediate mitochondrial transfer (MT) via tunneling nanotubes (TNTs), have been shown to exert therapeutic effects, yet the underlying mechanism remains unclear.

    Miro1-mediated mitochondrial transfer boosts stem cell therapy for muscle atrophy via restoring mitochondrial homeostasis · 2026 · DOI

  • Although mitochondrial dysfunction has been implicated in PLAN, how PLA2G6 loss affects mitochondrial structure and function across tissues, age, and sex remains unclear.

    Mitochondrial structural and functional defects in the Drosophila melanogaster model of PLA2G6 Associated Neurodegeneration (PLAN) · 2026 · DOI

  • Mutations in the mitochondrial proteins CHCHD2 and CHCHD10 cause severe neurodegenerative and neuromuscular disorders, yet their physiological functions remain poorly defined.

    Loss of CHCHD2 and CHCHD10 reveals differential vulnerability to bioenergetic failure in cardiac and skeletal muscle · 2026 · DOI

  • These conflicting observations may be attributed to com- pensatory mechanisms in place when partial PRX3 expression remains but warrants further investigation.

    Preclinical characterization and phase 1 clinical testing of targeting mitochondrial peroxiredoxin 3 in cancer · 2026 · DOI

  • Mitochondrial DNA (mtDNA) released into the cytosol activates innate immune signaling and promotes inflammation, yet its role in macrophages following sterile tissue injury remains poorly understood.

    Myeloid STING restrains cardiac remodeling by suppressing macrophage amyloid precursor protein · 2026 · DOI

  • While the ER replenishes Ca{superscript 2} via STIM1-mediated store-operated Ca{superscript 2} entry (SOCE), how mitochondria-ER contact sites (MERCs) influence this process remains unclear.

    Mitochondria-ER contacts restrain store-operated Ca{superscript 2}⁺ entry via Ca{superscript 2}⁺ flickering and STIM1 trapping · 2026 · DOI

  • RNA surveillance pathways maintain transcriptome integrity by eliminating aberrant, excess, and non-functional RNAs, yet it remains unclear whether distinct tissues exhibit equivalent requirements for RNA quality control.

    Tissue-specific consequences of impaired RNA surveillance converge on mitochondrial homeostasis · 2026 · DOI

  • Pathogenic MD variants are common in the population,(18-22, 25, 26) yet there is limited data evaluating the clinical relevance of such variants for carriers in unselected populations.

    Mitochondrial Disease variation in healthy older adults: a genotype-phenotype assessment linking pathogenic variants and mitochondrial constraint · 2026 · DOI

  • Yet how MCUcx activity is constrained to prevent Ca2+ overload and cell injury, and how the essential MCU regulator (EMRE), a subunit required for channel activity, mechanistically supports MCUcx function remains incompletely defined.

    Mechanistic basis of EMRE's essential role in the regulation of mitochondrial calcium uniporter complex · 2026 · DOI

  • Indiscriminate proteolysis by LonP1 is limited through tight coordination of substrate recognition, unfolding, translocation and catalytic cleavage, yet the role of ATP hydrolysis in these individual steps remains unclear.

    Mitochondrial Lon protease couples substrate translocation to proteolytic activation · 2026 · DOI

  • The neuronal cultures used throughout this study were generated from iPSCs, an in vitro system that doesn’t fully recapitulate the complexity of the developing human brain. The in vitro environment likely underestimates certain phenotypes, including effects on presynaptic structure, which may require more mature cultures or additional synaptic markers to be fully resolved. Accordingly, additional studies in more mature neuronal systems, or using complementary approaches such as iNeurons, will be needed to confirm our observations. While we report significant changes in gene expression and synaptic marker distribution, we do not provide a direct mechanistic link between mitochondrial hyperfusion and altered gene ARTICLE IN PRESS ARTICLE IN PRESS transcription. We speculate that changes in mitochondrial size trigger metabolic signals that influence transcriptional programs; however, this hypothesis remains to be tested empirically and is the subject of ongoing work in our and other laboratories. The transcriptomic analysis is based on a modest number of biological replicates, with four independent differentiations per genotype per time point. The interaction contrasts, which model mutation-specific changes in maturation trajectory, were underpowered to detect individual differentially expressed genes at stringent thresholds; pathway-level conclusions from gene set enrichment analysis are therefore emphasized over individual gene-level findings. Finally, although we consistently observe fewer neurons in mutant cultures than in controls, we were unable to determine definitively whether this reflects impaired differentiation of neural progenitor cells, selective neuronal death, or delayed maturation. Cleaved caspase-3 staining did not reveal increased apoptosis, and the deficit appeared to normalize by Day 65, suggesting delayed rather than failed neurogenesis; however, this interpretation requires further investigation.

    DRP1 mutations associated with EMPF1 encephalopathy perturb the transcriptional profile and maturation of cortical neurons · 2026 · DOI

  • , murine models, is warranted to determine whether TRAP1 ablation effectively reduces tumor-initiating capacity, metastatic potential, and resistance to chemotherapy agents.

    TRAP1 ablation improves mitochondrial cristae and oxidative phosphorylation in pancreatic cancer stem cells · 2026 · DOI

  • SLC25A17 was first described as an ATP transporter, but conflicting results regarding cofactor specificity in various experimental models obscure its precise function.

    Peroxisome Carrier SLC25A17: Potential Biomarker for Peroxisome Dysfunction and Human Disease · 2026 · DOI

  • How the outer mitochondrial membrane (OMM) accommodates acute increases in newly synthesized proteins before organelle adaptation is complete remains poorly understood.

    Mitochondrial-derived compartments buffer outer membrane protein load during acute mitochondrial adaptation · 2026 · DOI

  • Mitochondrial mass and mitochondrial DNA (mtDNA) copy number are coupled to metabolic demand at the cellular, tissue and organismal level, however, the molecular basis for homeostatic regulation of mtDNA is not understood.

    A conserved mechanism for regulation of mtDNA copy number in eukaryotes · 2026 · DOI

  • Emerging evidence positions mitochondria as actionable hubs for radiosensitization, yet several hurdles remain. First, predictive biomarkers—such as ROS responsiveness, Drp1 phosphorylation status, or Bcl−2 family expression profiles—must be validated to stratify patients most likely to benefit. Second, next−generation mitochondrial modulators (e.g., Drpitor1a, Mito−Met10) require rigorous pharmacokinetic and safety evaluation, ideally within tumor−selective nanocarriers to spare normal tissues. Third, ratio- nal combination regimens should exploit synthetic lethal interac- tions (e.g., Pol g inhibition in MLH1−deficient tumors) and synergies with immunotherapy (cGAS/STING activation). Fourth, real−time monitoring of mitochondrial dynamics and metabolic flux using advanced imaging or liquid biopsies could guide adaptive radiotherapy. Finally, clinical trials must address optimal sequenc- ing, dosing, and fractionation when pairing mitochondrial agents with radiation. Conquering radioresistance will likely demand personalized, mitochondria−targeted adjuncts that convert refrac- tory tumors into radiosensitive phenotypes. Mitochondria orchestrate radioresistance through intercon- nected mechanisms: metabolic reprogramming (enhanced OXPHOS, glycolysis, and PPP flux), ROS regulation (upregulated antioxidant enzymes, GSH, NRF2), dynamic remodeling (Drp1−mediated fission, OPA1/Mfn fusion), apoptotic dysregulation (Bcl−2 family overexpression, IAP−mediated caspase blockade), and mtDNA repair (Pol g, SSBP1, EXOG). These adaptations collectively enable cancer cells to survive radiation −induced genotoxic and oxidative stress, repair damage, and evade cell death.

    Targeting mitochondria as a potential therapeutic strategy against radioresistance in cancer · 2026 · DOI

  • While therapeutic strategies targeting MAMs are still in early stages, studies in yeast and mammalian systems reveal a conserved principle: mitochondria continuously communicate their functional state to other organelles through a combination of physical and functional contacts. In yeast, ERMES tethers mitochondria to the lipid exchange, metabolic adaptation, and ER, coordinating retrograde independent signaling via RTG-dependent and pathways. In mammalian cells, analogous structures, MAMs, mediate Ca2+ flux, lipid transfer, and redox signaling, which can feed back to the ER and trigger stress responses such as the UPRmt. Beyond calcium, other inter-organellar ion fluxes play key roles. Frontiers in Cell and Developmental Biology 07 frontiersin.org Guaragnella et al. 10.3389/fcell.2026.1820168 Lactate can trigger ER magnesium release into mitochondria, (Daw et al., 2020); additionally, mitochondria are a major cellular iron reservoir, and disruption of ERMES can activate an iron starvation response (Xue et al., 2017). Despite differences in molecular components and pathway architecture, a unified conceptual framework emerges: mitochondrial health is continuously monitored and communicated through dynamic interactions, enabling cells to sense, adapt, and respond to mitochondrial stress. This conserved design underscores the central role of inter-organellar cross talk in maintaining cellular homeostasis and modulating stress response with respect to the intensity of the stress itself. Mitochondria- organelle contacts are implicated in many diseases, but their therapeutic potential remains under investigation. A key future challenge is the identification of molecular signatures, regulatory proteins, and metabolic determinants governing to distinguish adaptive from maladaptive contact remodeling. Such knowledge could guide the development of targeted modulators capable of selectively enhancing or disrupting specific tethering events. Ultimately, a deeper understanding of inter-organelle cross talk will provide fundamental insights into cell biology and elucidate mechanisms underlying diverse human diseases (Table 1).

    Mitochondria in the middle of inter- organellar cross talk: insights from yeast to humans · 2026 · DOI

  • of in vivo model organisms (green non-mammalian, blue mammalian) and in vitro models (purple). Created in https:// BioRender.com NDUFS1 homolog ND-75 demonstrated a clear correlation between depletion and disease severity, affecting lifespan, behaviour, mitochondrial morphology, metabolism and gamma-aminobutyric acid (GABA) levels, hinting on potential neuronal dysfunction [120]. In addition to RNAi-mediated approaches, genetically engineered Drosophila models have been generated to functionally validate disease-associated variants. A GAL4/ UAS-mediated model carrying a pathogenic variant of NDUFS7 homolog ND-20 was originally developed to assess genetic variants found in dogs with LS enabling improved genetic testing and supporting the use of spontaneous large mammal models for research of CI deficiency [168]. Models targeting the NDUFS8 homolog ND-23 have been used to investigate LS and MELAS related pathomechanisms [139]. RNAi- and GAL4/UAS-mediated NDUFS8/ND-23 knockdown induces neuronal loss, retinal degeneration and disrupted lipid metabolism with lipid droplet accumulation in glial cells, recapitulating key features of CI deficiency. In response, enhancing the neuronal glucose uptake partially rescued neurodegeneration, whereas glial pathology persisted, which highlights the potential role for lipid homeostasis in CI-associated disease [139]. Beyond nuclear encoded subunits, Drosophila models harbouring mutations in mtDNA encoded CI subunit ND2 have also been established [141, 169]. These models are affected in their lifespan and behaviour and exhibit seizures, neurodegeneration and decreased CI activity, linked to impaired proton pumping [141]. Similar to findings to findings in NDUFS8/ND-23 knockdown models, ND2 mutants show defects in fatty acid and lipid storage. Pharmacological inhibition of TOR signalling by rapamycin rescued lifespan and lipid storage defects independently of autophagy, underscoring metabolic modulations as a potential therapeutic strategy in CI deficiency [169].

    Mitochondrial complex I deficiency-associated diseases and models · 2026 · DOI

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110 open questions have been extracted from the limitations and future-work passages of 566 Mitochondrial Function and Pathology papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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