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Human mitochondrial DNA deletions associated with mutations in the gene encoding Twinkle, a phage T7 gene 4-like protein localized in mitochondria.

Authors: Spelbrink, JN  Li, FY  Tiranti, V  Nikali, K  Yuan, QP  Tariq, M  Wanrooij, S  Garrido, N  Comi, G  Morandi, L  Santoro, L  Toscano, A  Fabrizi, GM  Somer, H  Croxen, R  Beeson, D  Poulton, J  Suomalainen, A  Jacobs, HT  Zeviani, M  Larsson, C 
Citation: Spelbrink JN, etal., Nat Genet. 2001 Jul;28(3):223-31.
Pubmed: (View Article at PubMed) PMID:11431692
DOI: Full-text: DOI:10.1038/90058

The gene products involved in mammalian mitochondrial DNA (mtDNA) maintenance and organization remain largely unknown. We report here a novel mitochondrial protein, Twinkle, with structural similarity to phage T7 gene 4 primase/helicase and other hexameric ring helicases. Twinkle colocalizes with mtDNA in mitochondrial nucleoids. Screening of the gene encoding Twinkle in individuals with autosomal dominant progressive external ophthalmoplegia (adPEO), associated with multiple mtDNA deletions, identified 11 different coding-region mutations co-segregating with the disorder in 12 adPEO pedigrees of various ethnic origins. The mutations cluster in a region of the protein proposed to be involved in subunit interactions. The function of Twinkle is inferred to be critical for lifetime maintenance of human mtDNA integrity.


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RGD Object Information
RGD ID: 1600544
Created: 2007-03-13
Species: All species
Last Modified: 2007-03-13
Status: ACTIVE


RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.