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Stop codon read-through of a methylmalonic aciduria mutation.

Abstract：

:A stop codon defect in methylmalonyl-CoA mutase (resulting in a truncated unstable protein) accounts for up to 14% of mutations identified as causes of Methylmalonic aciduria. There are currently limited treatment regimes for patients with this inherited condition. We aimed to investigate the use of stop codon read-through drugs in a genomic reporter assay cell line with a defect in the mutase gene. A single C-T base change was introduced into exon 6 of the human MUT sequence in the BAC clone RP11-463L20 resulting in an arginine residue being replaced with a TGA stop codon. An enhanced green fluorescent protein reporter gene was introduced in-frame with exon 13 of the MUT gene. The construct was transfected into HeLa cells to produce the genomic reporter assay cell line. To test the suppression of nonsense mutations, cells were incubated in the presence of different compounds for a period of 72 h then analysed by flow cytometry. Treatment of the cells with gentamicin resulted in a 1.6-fold increase in reporter protein, whilst G418 treatment resulted in no change, however the two drugs together acted synergistically to increase the production of methylmalonyl-CoA mutase 2.0-fold (confirmed by mRNA, flow cytometry and enzyme activity). Zidovudine, adefovir and cisplatin were also found to have some activity in the stop codon read-through genomic reporter assay. These results encourage further testing of compounds as well as follow up animal studies. This is the first study to demonstrate the use of stop codon read-through drugs for the potential treatment of Methylmalonic aciduria.

journal_name

Mol Genet Metab

journal_title

Molecular genetics and metabolism

authors

Buck NE,Wood L,Hu R,Peters HL

doi

10.1016/j.ymgme.2009.04.004

subject

Has Abstract

pub_date

2009-08-01 00:00:00

pages

244-9

issue

4

eissn

1096-7192

issn

1096-7206

pii

S1096-7192(09)00100-0

journal_volume

97

pub_type

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