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The Role of the Mammalian DNA End-processing Enzyme Polynucleotide Kinase 3’-Phosphatase in Spinocerebellar Ataxia Type 3 Pathogenesis


We report that human polynucleotide kinase 3’-phosphatase (PNKP), a major DNA strand break repair enzyme, stably associates with Ataxin-3 (ATXN3). This protein contains repeats of the amino acid glutamine, and the expansion of these repeats from 14–41 to 55–82 glutamines leads to a neurological disorder called Spinocerebellar ataxia type 3 (SCA3), also known as Machado-Joseph Disease (MJD). However, how this expansion of glutamine leads to ataxia has remained unclear. Here we show that normal ATXN3 protein stimulates, but the expanded ATXN3 inhibits, PNKP’s DNA repair activity, causing an accumulation of DNA damage. Furthermore, a SCA3 mouse model showed decreased PNKP activity, mostly in a region that is highly affected in MJD patients’ brains. Analysis of human MJD patients’ neuronal DNA showed significant accumulation of DNA strand breaks. Collectively, the accumulation of DNA damage due to decreased PNKP repair activity is likely to induce neuronal cell death, a hallmark of SCA3/MJD pathogenesis.


Vyšlo v časopise: The Role of the Mammalian DNA End-processing Enzyme Polynucleotide Kinase 3’-Phosphatase in Spinocerebellar Ataxia Type 3 Pathogenesis. PLoS Genet 11(1): e32767. doi:10.1371/journal.pgen.1004749
Kategorie: Research Article
prolekare.web.journal.doi_sk: https://doi.org/10.1371/journal.pgen.1004749

Souhrn

We report that human polynucleotide kinase 3’-phosphatase (PNKP), a major DNA strand break repair enzyme, stably associates with Ataxin-3 (ATXN3). This protein contains repeats of the amino acid glutamine, and the expansion of these repeats from 14–41 to 55–82 glutamines leads to a neurological disorder called Spinocerebellar ataxia type 3 (SCA3), also known as Machado-Joseph Disease (MJD). However, how this expansion of glutamine leads to ataxia has remained unclear. Here we show that normal ATXN3 protein stimulates, but the expanded ATXN3 inhibits, PNKP’s DNA repair activity, causing an accumulation of DNA damage. Furthermore, a SCA3 mouse model showed decreased PNKP activity, mostly in a region that is highly affected in MJD patients’ brains. Analysis of human MJD patients’ neuronal DNA showed significant accumulation of DNA strand breaks. Collectively, the accumulation of DNA damage due to decreased PNKP repair activity is likely to induce neuronal cell death, a hallmark of SCA3/MJD pathogenesis.


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