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    Loss of PCLO function underlies pontocerebellar hypoplasia type III

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    URI
    http://hdl.handle.net/11287/593900
    Author
    Ahmed, Mustafa Y.
    Chioza, Barry A.
    Rajab, A.
    Schmitz-Abe, K.
    Al-Khayat, A.
    Al-Turki, S.
    Baple, E. L.
    Patton, M. A.
    Al-Memar, A. Y.
    Hurles, M. E.
    Partlow, J. N.
    Hill, R. S.
    Evrony, G. D.
    Servattalab, S.
    Markianos, K.
    Walsh, C. A.
    Crosby, Andrew H.
    Mochida, G. H.
    Date
    2015-04-28
    Journal
    Neurology
    Type
    Journal Article
    Research Support, N.I.H., Extramural
    Research Support, Non-U.S. Gov't
    Publisher
    Neurology
    DOI
    10.1212/WNL.0000000000001523
    Metadata
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    Abstract
    OBJECTIVE: To identify the genetic cause of pontocerebellar hypoplasia type III (PCH3). METHODS: We studied the original reported pedigree of PCH3 and performed genetic analysis including genome-wide single nucleotide polymorphism genotyping, linkage analysis, whole-exome sequencing, and Sanger sequencing. Human fetal brain RNA sequencing data were then analyzed for the identified candidate gene. RESULTS: The affected individuals presented with severe global developmental delay and seizures starting in the first year of life. Brain MRI of an affected individual showed diffuse atrophy of the cerebrum, cerebellum, and brainstem. Genome-wide single nucleotide polymorphism analysis confirmed the linkage to chromosome 7q we previously reported, and showed no other genomic areas of linkage. Whole-exome sequencing of 2 affected individuals identified a shared homozygous, nonsense variant in the PCLO (piccolo) gene. This variant segregated with the disease phenotype in the pedigree was rare in the population and was predicted to eliminate the PDZ and C2 domains in the C-terminus of the protein. RNA sequencing data of human fetal brain showed that PCLO was moderately expressed in the developing cerebral cortex. CONCLUSIONS: Here, we show that a homozygous, nonsense PCLO mutation underlies the autosomal recessive neurodegenerative disorder, PCH3. PCLO is a component of the presynaptic cytoskeletal matrix, and is thought to be involved in regulation of presynaptic proteins and synaptic vesicles. Our findings suggest that PCLO is crucial for the development and survival of a wide range of neuronal types in the human brain.
    Citation
    Neurology. 2015 Apr 28;84(17):1745-50.
    Publisher URL
    http://www.ncbi.nlm.nih.gov/pmc/articles/pmid/25832664/
    Note
    This article is available via Open Access. Please click on the 'Additional Link' above to access the full-text.
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