Abstract
The levels of a specific mitochondrial DNA deletion (mtDNA4977) measured in 12 brain regions of 6 normal adults 39 to 82 years old exhibited striking variation among anatomical locations. Comparisons of the same region among individuals showed an increase of mtDNA4977 with age. The three regions with the highest levels, caudate, putamen and substantia nigra, are characterized by a high dopamine metabolism. The breakdown of dopamine by mitochondrial MAO produces H2O2 which can lead to oxygen radical formation. We suggest that mtDNA4977 may be the “tip of the iceberg” of the spectrum of somatic mutations produced by oxidative damage.
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Wei Soong, N., Hinton, D., Cortopassi, G. et al. Mosaicism for a specific somatic mitochondrial DNA mutation in adult human brain. Nat Genet 2, 318–323 (1992). https://doi.org/10.1038/ng1292-318
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DOI: https://doi.org/10.1038/ng1292-318
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