This case suggests that certain mitochondrial mutations may represent an independent vascular risk factor and highlights the importance of considering a mitochondrial etiology in cases of atypical ischemic optic neuropathy, particularly in young patients without cardiovascular risk factors.
Key Findings
Results
A 47-year-old man carrying the mitochondrial DNA mutation m.13513G>A in the MT-ND5 gene presented with unilateral non-arteritic anterior ischemic optic neuropathy (NAION) in the absence of cardiovascular risk factors.
The patient carried the mitochondrial DNA mutation m.13513G>A located in the MT-ND5 gene
The presentation was unilateral non-arteritic anterior ischemic optic neuropathy
Standard cardiovascular risk factors were absent in this patient
Differential diagnoses, including Leber's hereditary optic neuropathy, were excluded before arriving at this diagnosis
Discussion
Mitochondrial angiopathy associated with certain mitochondrial diseases may contribute to ischemic optic neuropathy through microcirculatory disturbances at the optic nerve head.
Mitochondrial angiopathy is recognized as being associated with certain mitochondrial diseases
The proposed mechanism involves microcirculatory disturbances induced by mitochondrial angiopathy
This mechanism could link mitochondrial cytopathy to ischemia of the optic nerve head
The authors describe this as a pathophysiological hypothesis rather than a confirmed mechanism
Background
Mitochondrial diseases can lead to highly heterogeneous clinical manifestations including optic neuropathies, with Leber's hereditary optic neuropathy being the prototypical form.
Mitochondrial diseases are associated with a wide spectrum of clinical presentations
Optic neuropathy is among the recognized manifestations of mitochondrial disease
Leber's hereditary optic neuropathy is described as the 'representative' or prototypical mitochondrial optic neuropathy
This case illustrates that mitochondrial mutations can manifest as ischemic rather than purely neurodegenerative optic neuropathy
Discussion
Certain mitochondrial mutations may represent an independent vascular risk factor for ischemic optic neuropathy.
The case presented involved NAION occurring without conventional cardiovascular risk factors
The authors propose that the mitochondrial mutation itself could be the underlying vascular risk factor
This finding suggests a need to consider mitochondrial etiology in atypical ischemic optic neuropathy cases
The authors specifically highlight young patients without cardiovascular risk factors as a population where mitochondrial etiology should be considered
What This Means
This research presents a case report of a 47-year-old man who developed a sudden loss of vision in one eye due to reduced blood flow to the optic nerve — a condition called non-arteritic anterior ischemic optic neuropathy (NAION). What made this case unusual is that the patient had none of the typical risk factors for this condition, such as high blood pressure, diabetes, or cardiovascular disease. Instead, he was found to carry a specific mutation in his mitochondrial DNA (the genetic material found in the energy-producing parts of cells), specifically the m.13513G>A mutation in the MT-ND5 gene.
The authors propose that this mitochondrial mutation may have contributed to the optic nerve damage by affecting the tiny blood vessels supplying the nerve — a phenomenon known as mitochondrial angiopathy. Mitochondria are critical for energy production in cells, and when they malfunction, they can also impair the health of blood vessel walls, potentially leading to poor blood flow in small vessels. This could explain how a person with healthy lifestyle factors and no conventional vascular risk factors could still experience an ischemic (blood-flow-related) injury to the optic nerve.
This research suggests that mitochondrial DNA mutations should be considered as a possible independent risk factor for vascular events affecting the eye, particularly in younger patients or those who develop ischemic optic neuropathy without an obvious explanation. It underscores the importance of thorough genetic and mitochondrial evaluation in atypical cases, which could have implications for how clinicians investigate and counsel patients with unexplained optic nerve damage.
Mathot A, Maraite F. (2026). [Acute anterior ischemic optic neuropathy in the context of mitochondrial disease].. Revue medicale de Liege. https://pubmed.ncbi.nlm.nih.gov/42751844/