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DNM1L Variant Alters Baseline Mitochondrial Function and Response to Stress in a Patient with Severe Neurological Dysfunction

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Abstract

Mitochondria play vital roles in brain development and neuronal activity, and mitochondrial dynamics (fission and fusion) maintain organelle function through the removal of damaged components. Dynamin-like protein-1 (DRP-1), encoded by DNM1L, is an evolutionarily conserved GTPase that mediates mitochondrial fission by surrounding the scission site in concentric ring-like structures via self-oligomerization, followed by GTPase-dependant constriction. Here, we describe the clinical characteristics and cellular phenotype of a patient with severe neurological dysfunction, possessing a homozygous DNM1L variant c.305C>T (p.T115M) in the GTPase domain. For comparative analysis, we also describe a previously identified heterozygous variant demonstrating a rapidly fatal neurocognitive phenotype (c.261dup/c.385:386del, p.W88M*9/E129K*6). Using patient-generated fibroblasts, we demonstrated both DNM1L variants undergo adverse alterations to mitochondrial structure and function, including impaired mitochondrial fission, reduced membrane potential, and lower oxidative capacity including an increased cellular level of reactive oxygen species (ROS) and dsDNA breaks. Mutation of DNM1L was also associated with impaired responses to oxidative stress, as treatment with hydrogen peroxide dramatically increased cellular ROS, with minimal exacerbation of already impaired mitochondrial function. Taken together, our observations indicate that homozygous p.T115M variant of DNM1L produces a neurological and neurodevelopmental phenotype, consistent with impaired mitochondrial architecture and function, through a diminished ability to oligomerize, which was most prevalent under oxidative stress.

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Acknowledgements

The authors would like to acknowledge the Hospital for Sick Children David Fear Fund.

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This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

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Correspondence to Jason T. Maynes.

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Ethical Statement

All samples were collected after institutional ethics approval (Regional Ethics Board File Number: 1000009004) and approved parental consent. Each subject (parental caregivers) gave signed informed consent to sample acquisition, fibroblast isolation, analysis, and publication.

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Hogarth, K.A., Costford, S.R., Yoon, G. et al. DNM1L Variant Alters Baseline Mitochondrial Function and Response to Stress in a Patient with Severe Neurological Dysfunction. Biochem Genet 56, 56–77 (2018). https://doi.org/10.1007/s10528-017-9829-2

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