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The use of PNAs and their derivatives in mitochondrial gene therapy

Lookup NU author(s): Dr Paul Smith, Dr Gunther Ross, Dr Theresa Wardell, Professor Robert Taylor, Professor Doug Turnbull, Professor Robert Lightowlers

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Abstract

Human mitochondria contain their own genome, mtDNA. This small molecule encodes 24 RNA species and 13 polypeptides, which are essential components of the mitochondrial respiratory chain. The mitochondrial genome is present in hundreds or thousands of copies in each cell and is believed to turnover throughout the life of the cell. Defects of the mitochondrial genome (mtDNA) cause a variety Of multisystemic disorders routinely affecting the muscle and nervous system. There is currently no effective treatment for patients with defects of the mitochondrial genome. In many patients, defective cells harbour two sub-populations of mtDNA (a situation termed hetero-plasmy), one being normal, the other containing the pathogenic mutation. The mutated copy is often recessive. with biochemical and clinical defects only becoming apparent when the levels of mutated mtDNA outweigh the normal copies. It has therefore been postulated that by selectively preventing replication of the mutated mtDNA. the normal copy will propagate, restoring biochemical function. The search has therefore been on during recent years to identify an antigenomic molecule that will fulfil this criterion. Following evidence that peptide nucleic acids could selectively inhibit replication of templates carrying a known pathogenic mtDNA mutation in vitro. we report on the progress of this approach and the various modifications that are now being used to improve the efficacy of PNA-based antigenomic inhibition.


Publication metadata

Author(s): Smith PM, Ross GF, Wardell TM, Taylor RW, Turnbull DM, Lightowlers RN

Publication type: Article

Publication status: Published

Journal: Letters in Peptide Science

Year: 2003

Volume: 10

Issue: 3-4

Pages: 353-360

Print publication date: 01/01/2003

ISSN (print): 0929-5666

ISSN (electronic):

Publisher: Springer

URL: http://dx.doi.org/10.1007/BF02484570

DOI: 10.1007/BF02484570


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