Pyridoxine responsiveness in novel mutations of the PNPO gene
| Autor: | Mary B. Connolly, Philippa B. Mills, Lucia Abela, K Paul, Eduard A. Struys, Eduard Paschke, Nicole I. Wolf, G. Schmiedel, Oswald Hasselmann, Peter E. Clayton, Sylvia Stockler, Doris Hofer, Barbara Plecko, Oliver Maier, Simone Kanz |
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| Přispěvatelé: | Pediatric surgery, Laboratory Medicine, NCA - Brain mechanisms in health and disease, University of Zurich, Plecko, Barbara |
| Rok vydání: | 2015 |
| Předmět: |
Male
DNA Mutational Analysis Gene Expression PNPO Compound heterozygosity medicine.disease_cause Bioinformatics Exon Epilepsy Status Epilepticus Missense mutation Medicine Genetics Mutation Drug Substitution Brain Diseases Metabolic Genetic Carrier Screening Pyridoxine Electroencephalography Exons Pyridoxaminephosphate Oxidase 2728 Neurology (clinical) Pyridoxal Phosphate Hypoxia-Ischemia Brain Female Chromosome Deletion Spasms Infantile medicine.drug education Mutation Missense 610 Medicine & health CHO Cells Biology Affect (psychology) Article Diagnosis Differential Cricetulus Seizures Animals Humans Gene Alleles business.industry Infant Newborn Aldehyde Dehydrogenase medicine.disease 10036 Medical Clinic Mutation testing Neurology (clinical) business |
| Zdroj: | Neurology, 82(16), 1425-1433. Lippincott Williams and Wilkins Plecko, B, Paul, K, Mills, P, Clayton, P, Paschke, E, Maier, O, Hasselmann, O, Schmiedel, G, Kanz, S, Connolly, M, Wolf, N I, Struys, E A, Stockler, S, Abela, L & Hofer, D 2014, ' Pyridoxine responsiveness in novel mutations of the PNPO gene ', Neurology, vol. 82, no. 16, pp. 1425-1433 . https://doi.org/10.1212/WNL.0000000000000344 |
| ISSN: | 1526-632X 0028-3878 |
| DOI: | 10.1212/WNL.0000000000000344 |
| Popis: | Objective: To determine whether patients with pyridoxine-responsive seizures but normal biomarkers for antiquitin deficiency and normal sequencing of the ALDH7A1 gene may have PNPO mutations. Methods: We sequenced the PNPO gene in 31 patients who fulfilled the above-mentioned criteria. Results: We were able to identify 11 patients carrying 3 novel mutations of the PNPO gene. In 6 families, a homozygous missense mutation p.Arg225His in exon 7 was identified, while 1 family was compound heterozygous for a novel missense mutation p.Arg141Cys in exon 5 and a deletion c.279_290del in exon 3. Pathogenicity of the respective mutations was proven by absence in 100 control alleles and expression studies in CHO-K1 cell lines. The response to pyridoxine was prompt in 4, delayed in 2, on EEG only in 2, and initially absent in another 2 patients. Two unrelated patients homozygous for the p.Arg225His mutation experienced status epilepticus when switched to pyridoxal 5′-phosphate (PLP). Conclusions: This study challenges the paradigm of exclusive PLP responsiveness in patients with pyridoxal 5′-phosphate oxidase deficiency and underlines the importance of consecutive testing of pyridoxine and PLP in neonates with antiepileptic drug–resistant seizures. Patients with pyridoxine response but normal biomarkers for antiquitin deficiency should undergo PNPO mutation analysis. |
| Databáze: | OpenAIRE |
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