Uniparental disomy of chromosome 16 unmasks recessive mutations of FA2H/SPG35 in 4 families
| Autor: | Montserrat Ruiz, Stephan Züchner, Anne S. Soehn, Tim W. Rattay, Aurora Pujol, David Monk, Konstanze Hörtnagel, Olaf Riess, Marion Döbler-Neumann, Peter Bauer, Stefanie Beck-Wödl, Karin Schäferhoff, Agatha Schlüter, Ludger Schöls, Rebecca Schüle |
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| Rok vydání: | 2016 |
| Předmět: |
Male
0301 basic medicine congenital hereditary and neonatal diseases and abnormalities genetics [Heredodegenerative Disorders Nervous System] Adolescent Hereditary spastic paraplegia Genetic counseling Mutation Missense Biology medicine.disease_cause Article Mixed Function Oxygenases 03 medical and health sciences 0302 clinical medicine Chromosome 16 Genotype medicine Malalties hereditàries Humans Missense mutation Family ddc:610 fatty acid alpha-hydroxylase Child Genetics Paraplegia Mutation Uniparental Disomy genetics [Mixed Function Oxygenases] medicine.disease Uniparental disomy 030104 developmental biology Codon Nonsense Heredodegenerative Disorders Nervous System Microsatellite Female Neurology (clinical) Genetic disorders Chromosomes Human Pair 16 030217 neurology & neurosurgery Microsatellite Repeats |
| Zdroj: | Dipòsit Digital de la UB Universidad de Barcelona Recercat. Dipósit de la Recerca de Catalunya instname Neurology 87(2), 186-191 (2016). doi:10.1212/WNL.0000000000002843 |
| DOI: | 10.1212/WNL.0000000000002843 |
| Popis: | Objective: Identifying an intriguing mechanism for unmasking recessive hereditary spastic paraplegias. Method: Herein, we describe 4 novel homozygous FA2H mutations in 4 nonconsanguineous families detected by whole-exome sequencing or a targeted gene panel analysis providing high coverage of all known hereditary spastic paraplegia genes. Results: Segregation analysis revealed in all cases only one parent as a heterozygous mutation carrier whereas the other parent did not carry FA2H mutations. A macro deletion within FA2H , which could have caused a hemizygous genotype, was excluded by multiplex ligation-dependent probe amplification in all cases. Finally, a microsatellite array revealed uniparental disomy (UPD) in all 4 families leading to homozygous FA2H mutations. UPD was confirmed by microarray analyses and methylation profiling. Conclusion: UPD has rarely been described as causative mechanism in neurodegenerative diseases. Of note, we identified this mode of inheritance in 4 families with the rare diagnosis of spastic paraplegia type 35 (SPG35). Since UPD seems to be a relevant factor in SPG35 and probably additional autosomal recessive diseases, we recommend segregation analysis especially in nonconsanguineous homozygous index cases to unravel UPD as mutational mechanism. This finding may bear major repercussion for genetic counseling, given the markedly reduced risk of recurrence for affected families. |
| Databáze: | OpenAIRE |
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