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Co-occurrence of four nucleotide changes associated with an adult mitochondrial ataxia phenotype

Zabalza, Ramón; Nurminen, Anssi; Kaguni, Laurie S; Garesse, Rafael; Gallardo, M Ester; Bornstein, Belén (2014)

 
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Zabalza, Ramón
Nurminen, Anssi
Kaguni, Laurie S
Garesse, Rafael
Gallardo, M Ester
Bornstein, Belén
2014

BMC Research Notes 7
833
BioMediTech - BioMediTech
This publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited.
doi:10.1186/1756-0500-7-883
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https://urn.fi/URN:NBN:fi:uta-201503051169

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BioMed Central open access
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Background

Mitochondrial DNA maintenance disorders are an important cause of hereditary ataxia syndrome, and the majority are associated with mutations in the gene encoding the catalytic subunit of the mitochondrial DNA polymerase (DNA polymerase gamma), POLG. Mutations resulting in the amino acid substitutions A467T and W748S are the most common genetic causes of inherited cerebellar ataxia in Europe.
Methods

We report here a POLG mutational screening in a family with a mitochondrial ataxia phenotype. To evaluate the likely pathogenicity of each of the identified changes, a 3D structural analysis of the PolG protein was carried out, using the Alpers mutation clustering tool reported previously.
Results

Three novel nucleotide changes and the p.Q1236H polymorphism have been identified in the affected members of the pedigree. Computational analysis suggests that the p.K601E mutation is likely the major contributing factor to the pathogenic phenotype.
Conclusions

Computational analysis of the PolG protein suggests that the p.K601E mutation is likely the most significant contributing factor to a pathogenic phenotype. However, the co-occurrence of multiple POLG alleles may be necessary in the development an adult-onset mitochondrial ataxia phenotype.
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