Rare compound heterozygous variants in PNKP identified by whole exome sequencing in a German patient with ataxia-oculomotor apraxia 4 and pilocytic astrocytoma
Ataxia-oculomotor apraxia type 4 (AOA4) is a rare autosomal recessive neurologic disorder. The phenotype is characterized by ataxia, oculomotor apraxia, peripheral neuropathy and dystonia. AOA4 is caused by biallelic pathogenic variants in the PNKP gene encoding a polynucleotide kinase 3′-phosphatas...
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| Hauptverfasser: | , , , , , , , , , , , , |
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| Dokumenttyp: | Article (Journal) Editorial |
| Sprache: | Englisch |
| Veröffentlicht: |
2 March 2018
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| In: |
Clinical genetics
Year: 2018, Jahrgang: 94, Heft: 1, Pages: 185-186 |
| ISSN: | 1399-0004 |
| DOI: | 10.1111/cge.13216 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1111/cge.13216 Verlag, lizenzpflichtig, Volltext: https://onlinelibrary.wiley.com/doi/abs/10.1111/cge.13216 
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| Verfasserangaben: | C. Scholz, M.M. Golas, R.G. Weber, C. Hartmann, U. Lehmann, F. Sahm, G. Schmidt, B. Auber, M. Sturm, B. Schlegelberger, T. Illig, D. Steinemann, W. Hofmann |
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| 245 | 1 | 0 | |a Rare compound heterozygous variants in PNKP identified by whole exome sequencing in a German patient with ataxia-oculomotor apraxia 4 and pilocytic astrocytoma |c C. Scholz, M.M. Golas, R.G. Weber, C. Hartmann, U. Lehmann, F. Sahm, G. Schmidt, B. Auber, M. Sturm, B. Schlegelberger, T. Illig, D. Steinemann, W. Hofmann |
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| 520 | |a Ataxia-oculomotor apraxia type 4 (AOA4) is a rare autosomal recessive neurologic disorder. The phenotype is characterized by ataxia, oculomotor apraxia, peripheral neuropathy and dystonia. AOA4 is caused by biallelic pathogenic variants in the PNKP gene encoding a polynucleotide kinase 3′-phosphatase with an important function in DNA-damage repair. By whole exome sequencing, we identified 2 variants within the PNKP gene in a 27-year-old German woman with a clinical AOA phenotype combined with a cerebellar pilocytic astrocytoma diagnosed at 23 years of age. One variant, a duplication in exon 14 resulting in the frameshift c.1253_1269dup p.(Thr424fs*49), has previously been described as pathogenic, for example, in cases of AOA4. The second variant, representing a nonsense mutation in exon 17, c.1545C>G p.(Tyr515*), has not yet been described and is predicted to cause a loss of the 7 C-terminal amino acids. This is the first description of AOA4 in a patient with central European descent. Furthermore, the occurrence of a pilocytic astrocytoma has not been described before in an AOA4 patient. Our data demonstrate compound heterozygous PNKP germline variants in a German patient with AOA4 and provide evidence for a possible link with tumor predisposition. Localization of the 2 variants in human PNKP NP_009185.2. NM_007254.3:c.1253_1269dup p.(Thr424fs*49) is predicted to cause a frameshift within the kinase domain, NM_007254.3:c.1545C>G p.(Tyr515*) is predicted to cause loss of 2 C-terminal amino acids of the kinase domain and 5 additional C-terminal amino acids. | ||
| 700 | 1 | |a Golas, M. M. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Weber, R. G. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Hartmann, C. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Lehmann, U. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Sahm, Felix |d 1984- |e VerfasserIn |0 (DE-588)1022852132 |0 (DE-627)717318478 |0 (DE-576)366075020 |4 aut | |
| 700 | 1 | |a Schmidt, G. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Auber, B. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Sturm, M. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Schlegelberger, B. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Illig, T. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Steinemann, D. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Hofmann, W. |e VerfasserIn |4 aut | |
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