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POLR1A variants underlie phenotypic heterogeneity in craniofacial, neural, and cardiac anomalies.
Am. J. Hum. Genet. 110, 809-825 (2023)
Heterozygous pathogenic variants in POLR1A, which encodes the largest subunit of RNA Polymerase I, were previously identified as the cause of acrofacial dysostosis, Cincinnati-type. The predominant phenotypes observed in the cohort of 3 individuals were craniofacial anomalies reminiscent of Treacher Collins syndrome. We subsequently identified 17 additional individuals with 12 unique heterozygous variants in POLR1A and observed numerous additional phenotypes including neurodevelopmental abnormalities and structural cardiac defects, in combination with highly prevalent craniofacial anomalies and variable limb defects. To understand the pathogenesis of this pleiotropy, we modeled an allelic series of POLR1A variants in vitro and in vivo. In vitro assessments demonstrate variable effects of individual pathogenic variants on ribosomal RNA synthesis and nucleolar morphology, which supports the possibility of variant-specific phenotypic effects in affected individuals. To further explore variant-specific effects in vivo, we used CRISPR-Cas9 gene editing to recapitulate two human variants in mice. Additionally, spatiotemporal requirements for Polr1a in developmental lineages contributing to congenital anomalies in affected individuals were examined via conditional mutagenesis in neural crest cells (face and heart), the second heart field (cardiac outflow tract and right ventricle), and forebrain precursors in mice. Consistent with its ubiquitous role in the essential function of ribosome biogenesis, we observed that loss of Polr1a in any of these lineages causes cell-autonomous apoptosis resulting in embryonic malformations. Altogether, our work greatly expands the phenotype of human POLR1A-related disorders and demonstrates variant-specific effects that provide insights into the underlying pathogenesis of ribosomopathies.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
Rna Polymerase I ; Acrofacial Dysostosis ; Congenital Heart Defect ; Craniofacial Anomalies ; Developmental Delay ; Epilepsy ; Limb Defects ; Neural Crest Cells ; Ribosomal Rna ; Ribosomopathies; Treacher-collins-syndrome; Outflow Tract; Rna; Generation; Mutation; Muscle; Heart
ISSN (print) / ISBN
0002-9297
e-ISSN
1537-6605
Quellenangaben
Volume: 110,
Issue: 5,
Pages: 809-825
Publisher
Elsevier
Publishing Place
New York, NY
Non-patent literature
Publications
Reviewing status
Peer reviewed
Institute(s)
Institute of Neurogenomics (ING)
Grants
National Institute of Child Health and Human Development
Cincinnati Children's Research Foundation Center for Pediatric Genomics Pilot Proposal
Cleft Palate Foundation's Paul W. Black Grant for Emerging Researchers
National Institute of Dental and Craniofacial Research
Stowers Institute for Medical Research
ERDF
German Research Foundation
Australian Government's Medical Research Futures Fund
Royal Children's Hospital Foundation
National Institutes of Health National Heart Lung and Blood Institute
JST CREST
Takeda Science Foundation
Uehara Memorial Foundation
Japan Society for the Promotion of Science (JSPS)
Cincinnati Children's Research Foundation Center for Pediatric Genomics Pilot Proposal
Cleft Palate Foundation's Paul W. Black Grant for Emerging Researchers
National Institute of Dental and Craniofacial Research
Stowers Institute for Medical Research
ERDF
German Research Foundation
Australian Government's Medical Research Futures Fund
Royal Children's Hospital Foundation
National Institutes of Health National Heart Lung and Blood Institute
JST CREST
Takeda Science Foundation
Uehara Memorial Foundation
Japan Society for the Promotion of Science (JSPS)