Loss of PCLO function underlies pontocerebellar hypoplasia type III

Mustafa Y. Ahmed, Barry A. Chioza, Anna Rajab, Klaus Schmitz-Abe, Aisha Al-Khayat, Saeed Al-Turki, Emma L. Baple, Michael A. Patton, Ali Y. Al-Memar, Matthew E. Hurles, Jennifer N. Partlow, R. Sean Hill, Gilad D. Evrony, Sarah Servattalab, Kyriacos Markianos, Christopher A. Walsh, Andrew H. Crosby, Ganeshwaran H. Mochida

Research output: Contribution to journalArticle

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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.

Original languageEnglish
Pages (from-to)1745-1750
Number of pages6
JournalNeurology
Volume84
Issue number17
DOIs
Publication statusPublished - Apr 28 2015

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Exome
RNA Sequence Analysis
Brain
Pedigree
Single Nucleotide Polymorphism
Genome
PDZ Domains
Synaptic Vesicles
Nonsense Codon
Cerebrum
Protein C
Neurodegenerative Diseases
Cerebral Cortex
Cerebellum
Genes
Brain Stem
Atrophy
Seizures
Chromosomes
Phenotype

ASJC Scopus subject areas

  • Clinical Neurology
  • Medicine(all)

Cite this

Ahmed, M. Y., Chioza, B. A., Rajab, A., Schmitz-Abe, K., Al-Khayat, A., Al-Turki, S., ... Mochida, G. H. (2015). Loss of PCLO function underlies pontocerebellar hypoplasia type III. Neurology, 84(17), 1745-1750. https://doi.org/10.1212/WNL.0000000000001523

Loss of PCLO function underlies pontocerebellar hypoplasia type III. / Ahmed, Mustafa Y.; Chioza, Barry A.; Rajab, Anna; Schmitz-Abe, Klaus; Al-Khayat, Aisha; Al-Turki, Saeed; Baple, Emma L.; Patton, Michael A.; Al-Memar, Ali Y.; Hurles, Matthew E.; Partlow, Jennifer N.; Hill, R. Sean; Evrony, Gilad D.; Servattalab, Sarah; Markianos, Kyriacos; Walsh, Christopher A.; Crosby, Andrew H.; Mochida, Ganeshwaran H.

In: Neurology, Vol. 84, No. 17, 28.04.2015, p. 1745-1750.

Research output: Contribution to journalArticle

Ahmed, MY, Chioza, BA, Rajab, A, Schmitz-Abe, K, Al-Khayat, A, Al-Turki, S, Baple, EL, Patton, MA, Al-Memar, AY, Hurles, ME, Partlow, JN, Hill, RS, Evrony, GD, Servattalab, S, Markianos, K, Walsh, CA, Crosby, AH & Mochida, GH 2015, 'Loss of PCLO function underlies pontocerebellar hypoplasia type III', Neurology, vol. 84, no. 17, pp. 1745-1750. https://doi.org/10.1212/WNL.0000000000001523
Ahmed MY, Chioza BA, Rajab A, Schmitz-Abe K, Al-Khayat A, Al-Turki S et al. Loss of PCLO function underlies pontocerebellar hypoplasia type III. Neurology. 2015 Apr 28;84(17):1745-1750. https://doi.org/10.1212/WNL.0000000000001523
Ahmed, Mustafa Y. ; Chioza, Barry A. ; Rajab, Anna ; Schmitz-Abe, Klaus ; Al-Khayat, Aisha ; Al-Turki, Saeed ; Baple, Emma L. ; Patton, Michael A. ; Al-Memar, Ali Y. ; Hurles, Matthew E. ; Partlow, Jennifer N. ; Hill, R. Sean ; Evrony, Gilad D. ; Servattalab, Sarah ; Markianos, Kyriacos ; Walsh, Christopher A. ; Crosby, Andrew H. ; Mochida, Ganeshwaran H. / Loss of PCLO function underlies pontocerebellar hypoplasia type III. In: Neurology. 2015 ; Vol. 84, No. 17. pp. 1745-1750.
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AU - Chioza, Barry A.

AU - Rajab, Anna

AU - Schmitz-Abe, Klaus

AU - Al-Khayat, Aisha

AU - Al-Turki, Saeed

AU - Baple, Emma L.

AU - Patton, Michael A.

AU - Al-Memar, Ali Y.

AU - Hurles, Matthew E.

AU - Partlow, Jennifer N.

AU - Hill, R. Sean

AU - Evrony, Gilad D.

AU - Servattalab, Sarah

AU - Markianos, Kyriacos

AU - Walsh, Christopher A.

AU - Crosby, Andrew H.

AU - Mochida, Ganeshwaran H.

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N2 - 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.

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