De novo double mutation in PAX6 and mtDNA tRNA Lys associated with atypical aniridia and mitochondrial disease
We report on the clinical, molecular and biochemical findings of a patient with the rare event (<4.02 × 10-9 per generation) of coinciding de novo mutations in the nuclear PAX6 (c.1252-1267del16) and the mitochondrial mt.RNA Lys (8347A[arrow right]G) genes. The boy suffers from exercise intoleran...
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Published in | Journal of molecular medicine (Berlin, Germany) Vol. 85; no. 2; pp. 163 - 168 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
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New York
Springer Nature B.V
01.02.2007
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Abstract | We report on the clinical, molecular and biochemical findings of a patient with the rare event (<4.02 × 10-9 per generation) of coinciding de novo mutations in the nuclear PAX6 (c.1252-1267del16) and the mitochondrial mt.RNA Lys (8347A[arrow right]G) genes. The boy suffers from exercise intolerance, ptosis, nystagmus, macular hypoplasia and anterior segment abnormalities evocative of Axenfeld-Rieger anomaly. The PAX6 mutation is predicted to cause haploinsufficiency. The novel mt.RNA Lys mutation is located close to the classic myoclonic epilepsy with ragged-red-fibers mutation, but the patient exhibits neither myoclonic epilepsy nor ragged-red-fibers. The degree of mutant mtDNA heteroplasmy, as determined by a very accurate pyrosequencing assay, varies between 31% (muscle) and 38% (fibroblasts). We discuss a potential effect of the PAX6 mutation on the mtDNA mutation rate. |
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AbstractList | We report on the clinical, molecular and biochemical findings of a patient with the rare event (<4.02 × 10-9 per generation) of coinciding de novo mutations in the nuclear PAX6 (c.1252-1267del16) and the mitochondrial mt.RNA Lys (8347A[arrow right]G) genes. The boy suffers from exercise intolerance, ptosis, nystagmus, macular hypoplasia and anterior segment abnormalities evocative of Axenfeld-Rieger anomaly. The PAX6 mutation is predicted to cause haploinsufficiency. The novel mt.RNA Lys mutation is located close to the classic myoclonic epilepsy with ragged-red-fibers mutation, but the patient exhibits neither myoclonic epilepsy nor ragged-red-fibers. The degree of mutant mtDNA heteroplasmy, as determined by a very accurate pyrosequencing assay, varies between 31% (muscle) and 38% (fibroblasts). We discuss a potential effect of the PAX6 mutation on the mtDNA mutation rate. |
Author | Brinckmann, Anja Nürnberg, Peter Lucke, Barbara Janssen, Antoon Trijbels, Frans Rüther, Klaus Williamson, Kathleen Lorenz, Birgit Schuelke, Markus |
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Title | De novo double mutation in PAX6 and mtDNA tRNA Lys associated with atypical aniridia and mitochondrial disease |
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