Abstract
Maternally inherited diabetes and deafness (MIDD) is a mitochondrial genetic disorder with variable clinical presentations, which can delay its diagnosis. Herein, we report the case of a 57-year-old Japanese man with MIDD who developed chronic kidney disease. He developed proteinuria long before his diabetes and deafness; at the age of 36 years, a renal biopsy showed minor glomerular abnormality and electron microscopy showed mild mitochondrial degeneration in the distal tubular epithelial cells. Twenty years later, a second renal biopsy showed nephrosclerosis with interstitial fibrosis and arteriolar hyaline thickening, despite the absence of hypertension and relatively good glycemic control. Granular swollen epithelial cells were found in the medullary collecting duct epithelium. Electron microscopy showed accumulating mitochondria in podocytes and tubular cells, leading to the diagnosis of MIDD. A muscle biopsy also showed ragged-red fibers, despite the absence of muscle weakness. Mitochondrial DNA analysis revealed an m.3243A > G mutation, and taurine supplementation was initiated. Our findings suggest that mitochondrial dysfunction is mainly associated with progressive renal damage.
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Acknowledgement
The authors thank Dr Yuichi Goto (National Institute of Neuroscience, National Center for Neurology and Psychiatry) for mitochondrial genetic analysis. We also thank Marla Brunker from Edanz Group (https://en-author-services.edanzgroup.com/ac) for editing a draft of this manuscript.
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Tanaka, K., Ueno, T., Yoshida, M. et al. Chronic kidney disease caused by maternally inherited diabetes and deafness: a case report. CEN Case Rep 10, 220–225 (2021). https://doi.org/10.1007/s13730-020-00547-w
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DOI: https://doi.org/10.1007/s13730-020-00547-w