Abstract:
:Mitochondrial DNA (mtDNA) depletion syndrome (MDS), an autosomal recessive condition, is characterized by variable organ involvement with decreased mtDNA copy number and activities of respiratory chain enzymes in affected tissues. MtDNA depletion has been associated with mutations in nine autosomal genes, including thymidine kinase (TK2), which encodes a ubiquitous mitochondrial protein. To study the pathogenesis of TK2-deficiency, we generated mice harboring an H126N Tk2 mutation. Homozygous Tk2 mutant (Tk2(-/-)) mice developed rapidly progressive weakness after age 10 days and died between ages 2 and 3 weeks. Tk2(-/-) animals showed Tk2 deficiency, unbalanced dNTP pools, mtDNA depletion and defects of respiratory chain enzymes containing mtDNA-encoded subunits that were most prominent in the central nervous system. Histopathology revealed an encephalomyelopathy with prominent vacuolar changes in the anterior horn of the spinal cord. The H126N TK2 mouse is the first knock-in animal model of human MDS and demonstrates that the severity of TK2 deficiency in tissues may determine the organ-specific phenotype.
journal_name
Hum Mol Genetjournal_title
Human molecular geneticsauthors
Akman HO,Dorado B,López LC,García-Cazorla A,Vilà MR,Tanabe LM,Dauer WT,Bonilla E,Tanji K,Hirano Mdoi
10.1093/hmg/ddn143subject
Has Abstractpub_date
2008-08-15 00:00:00pages
2433-40issue
16eissn
0964-6906issn
1460-2083pii
ddn143journal_volume
17pub_type
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