Inherited mitochondrial dysfunction triggered by OPA1 mutation impacts the sensory innervation fibre identity, functionality and regenerative potential in the cornea
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA1106761 | ENA |
REPOSITORIES: ENA
Similar Datasets
Project description:Mitochondrial dysfunctions are detrimental to organ metabolism. The cornea, transparent outmost layer of the eye, is prone to environmental aggressions, such as UV light, and therefore dependent on adequate mitochondrial function. While several reports have linked corneal defects to mitochondrial dysfunction, the impact of OPA1 mutation, known to induce such dysfunction, has never been studied in this context. We used the mouse line carrying OPA1delTTAG mutation to investigate its impact on corneal biology. To our surprise, neither the tear film composition nor the corneal epithelial transcriptomic signature were altered upon OPA1 mutation. However, when analyzing the corneal innervation, we discovered an undersensitivity of the cornea upon the mutation, but an increased innervation volume at 3 months. Furthermore, the fibre identity changed with a decrease of the SP+ axons. Finally, we demonstrated that the innervation regeneration was less efficient and less functional in OPA1+/- corneas. Altogether, our study describes the resilience of the corneal epithelial biology, reflecting the mitohormesis induced by the OPA1 mutation, and the adaptation of the corneal innervation to maintain its functionality despite its morphogenesis defects. These findings will participate to a better understanding of the mitochondrial dysfunction on peripheral innervation.
2024-08-21 | GSE266324 | GEO
Project description:The cornea is the transparent tissue covering the anterior part of the eye. Its main roles are to convey the light toward the retina, and to act as a protective barrier against infection or injury for the eye. The transparency of the cornea is a crucial component of its functionality and is the result of specific architecture and cell arrangements. The inner layer of the cornea is the endothelium, composed of a monolayer of endothelial cells. The next layer is the stroma, representing about two third of the thickness of the cornea, and is mainly composed of a specifically arranged extracellular matrix, secreted by few keratocytes1–4. Finally, the external layer is a life-long renewed pluristratified epithelium. The regulated epithelial homeostasis, crucial to maintain the corneal transparency, relies on stem and progenitor cells5. To coordinate epithelial homeostasis and healing, and to adequately respond to any change in the corneal environment, this tissue is highly innervated6,7. The corneal innervation is mainly composed of A and C sensory fibres whose cell bodies are located in the ophthalmic branch of the trigeminal ganglion8. Those fibres penetrate the corneal stroma from the periphery, as bundles of fibres branching and spreading within the stroma9. When entering in the epithelium, the fibres branche again and radiate horizontally to form the subbasal plexus. Finally, the sensory fibres shift orientation to reach the top of the epithelium, where they end up as free nerve endings6,7. There are three classes of fibres innervating the cornea: the mechano-nociceptors, the cold sensing neurons and the polymodal nociceptors, reacting respectively to mechanical, thermal and chemical stimuli10,11. Stimuli transduction is not the only role of the corneal innervation, as these fibres have a crucial role on epithelial homeostasis through the secretion of trophic factors essential for epithelial cell survival12. Due to its localization, the cornea is highly exposed to ultraviolet radiation and high oxygen tension, making it particularly vulnerable to mitochondrial defects13. These defects can be either inherited or non-inherited. Inherited forms result from mutations in mitochondrial DNA (mtDNA) or nuclear gene defects affecting mitochondrial function14. Inherited mitochondrial dysfunction is a key factor in the progression of Fuchs endothelial corneal dystrophy (FECD) and keratoconus13,15,16. Non-inherited mitochondrial dysfunction, on the other hand, can occur due to spontaneous mtDNA mutations or somatic mutations that accumulate with age, rendering the mitochondrial metabolism less efficient with time17. To date, the impact of inherited mitochondrial dysfunctions on corneal epithelium physiology has not been extensively studied. Case reports have linked mitochondrial diseases to corneal cloudiness18,19, perforation20 and edema21. Furthermore, mitochondrial defect was associated to inflammatory context and ROS production in ocular surface pathologies13,22. Despite these studies, the direct effect of mitochondrial disfunction on corneal biology remains elusive. Among the known pathologies originating from an inherited mitochondrial dysfunction, the dominant optic atrophy (DOA) is an inherited blinding disease caused by the degenescence of the retinal cell ganglions forming the optic nerve23. The mutation of the gene OPA1 is responsible for the majority of the DOA diagnostics. OPA1 gene encodes for a mitochondrial protein involved in the fusion process and is essential to maintain the organelle integrity. Generally, optic neuropathy is the characteristic syndrome for DOA, but a subset of patients, called dominant optic atrophy plus (DOA+), also declare extra-ocular syndromes such as ataxia, deafness and peripheral neuropathies24,25. A mouse model, bearing the OPA1delTTAG mutation, recapitulates the degenerative syndromes encountered in DOA+ patients25.. While DOA is associated with lens cloudiness, no report has linked DOA to ocular surface defects. Here, we investigated the impact of OPA1 delTTAG mutation on mouse cornea as its structure includes a large amout of sensory fibres that are crucial to maintain corneal homeostasis.
2024-07-25 | PXD052337 | Pride
Project description:0dpa Fibre vs epidermal laser capture microdisection comparison Keywords: Development
2006-06-27 | GSE5133 | GEO
Project description:0dpa Fibre vs epidermal laser capture microdisection comparison Total RNA was isolated from each cell type (fibre initial or non-fibre epidermal pavement cell) from both Plant 1 and Plant 2. Hence, there were two biological replicates of each cell-type. Sub-samples of each cell type, designated here as technical replicates, were taken as separate batches of cells from different groups of ovules, but each from the same pair of plants. In particular, there were four sub-samples of fibre initial cells from plant 1 and two from plant 2 and two sub-samples of non-fibre epidermal from plant 1 and four from plant 2. The complete experiment involved three dye-swap pairs using a total of 6 arrays.
2006-06-26 | E-GEOD-5133 | biostudies-arrayexpress
Project description:Through the genome-wide analysis of Ctr and OPA1 knock-down group, we reveal the transcriptome changes with OPA1 down-regulation
2019-07-31 | GSE135089 | GEO
Project description:Mitochondrial fusion and fission accompany adaptive responses to stress and altered metabolic demands. Inner membrane fusion and cristae morphogenesis depends on Optic Atrophy 1 (Opa1), which is expressed in different isoforms and is cleaved from a membrane-bound, long to a soluble, short form. Here, we have analyzed the physiological role of Opa1 isoforms and Opa1 processing by generating mouse lines expressing only one cleavable Opa1 isoform or a non-cleavable variant thereof. Our results show that expression of a single cleavable or non-cleavable Opa1 isoform preserves embryonic development and the health of adult mice. Opa1 processing is dispensable under metabolic and thermal stress, but prolongs lifespan and protects against mitochondrial cardiomyopathy in OXPHOS-deficient Cox10-/- mice. Mechanistically, loss of Opa1 processing disturbs the balance between mitochondrial biogenesis and mitophagy, suppressing cardiac hypertrophic growth in Cox10-/- hearts. Our results highlight the critical regulatory role of Opa1 processing, mitochondrial dynamics and metabolism for cardiac hypertrophy.
2024-08-10 | PXD048804 | Pride
Project description:To investigate the function of Opa1 in the regulation of adult neurogenesis, we created a conditional Opa1-knockout mouse line by cross-breeding Nestin-CreERT2;ROSA26YFP mice with Opa1-Flox mice. Using Tamoxifen, we induced Opa1 knockout on 8-weeks-old Nestin-CreERT2;ROSA26YFP;Opa1-Flox mice. We then sorted YFP-positive cells from the hippocampus using flow cytometry at 10 weeks. RNA was extracted from sorted cells and subjected to next generation sequencing.
2024-06-17 | GSE233464 | GEO
Project description:The goal of this study is to compare the transcriptome of HUVECs silenced or not for Opa1
2021-10-31 | GSE122042 | GEO