Abstract：
:Increased somatic mitochondrial DNA (mtDNA) mutagenesis causes premature aging in mice, and mtDNA damage accumulates in the human brain with aging and neurodegenerative disorders such as Parkinson disease (PD). Here, we study the complete spectrum of mtDNA changes, including deletions, copy-number variation and point mutations, in single neurons from the dopaminergic substantia nigra and other brain areas of individuals with Parkinson disease and neurologically healthy controls. We show that in dopaminergic substantia nigra neurons of healthy individuals, mtDNA copy number increases with age, maintaining the pool of wild-type mtDNA population in spite of accumulating deletions. This upregulation fails to occur in individuals with Parkinson disease, however, resulting in depletion of the wild-type mtDNA population. By contrast, neuronal mtDNA point mutational load is not increased in Parkinson disease. Our findings suggest that dysregulation of mtDNA homeostasis is a key process in the pathogenesis of neuronal loss in Parkinson disease.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Dölle C,Flønes I,Nido GS,Miletic H,Osuagwu N,Kristoffersen S,Lilleng PK,Larsen JP,Tysnes OB,Haugarvoll K,Bindoff LA,Tzoulis Cdoi
10.1038/ncomms13548subject
Has Abstractpub_date
2016-11-22 00:00:00pages
13548issn
2041-1723pii
ncomms13548journal_volume
7pub_type
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