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Eur J Hum Genet. 2019 Nov 6. doi: 10.1038/s41431-019-0539-6. [Epub ahead of print]

A variant of neonatal progeroid syndrome, or Wiedemann-Rautenstrauch syndrome, is associated with a nonsense variant in POLR3GL.

Author information

1
Medical Genetics Division, Department of Pediatrics, Sainte-Justine University Hospital Center, Montreal, QC, Canada.
2
CHU Sainte Justine Research Center, Université de Montréal, Montreal, QC, Canada.
3
Medical Biological Unit, Molecular Diagnostic Laboratory, Sainte-Justine University Hospital Center, Montreal, QC, Canada.
4
Integrated Centre for Pediatric Clinical Genomics, Génome Québec and Sainte-Justine University Hospital Center, Montreal, QC, Canada.
5
Departments of Neurology and Neurosurgery, Pediatrics and Human Genetics, McGill University, Montreal, QC, Canada.
6
Division of Medical Genetics, Department of Specialized Medicine, McGill University Health Center, Montreal, QC, Canada.
7
Child Health and Human Development Program, Research Institute of the McGill University Health Center, Montreal, QC, Canada.
8
Medical Genetics Division, Department of Pediatrics, Sainte-Justine University Hospital Center, Montreal, QC, Canada. p.campeau@umontreal.ca.
9
CHU Sainte Justine Research Center, Université de Montréal, Montreal, QC, Canada. p.campeau@umontreal.ca.

Abstract

Neonatal progeroid syndrome, also known as Wiedemann-Rautenstrauch syndrome, is a rare condition characterized by severe growth retardation, apparent macrocephaly with prominent scalp veins, and lipodystrophy. It is caused by biallelic variants in POLR3A, a gene encoding for a subunit of RNA polymerase III. All variants reported in the literature lead to at least a partial loss-of-function (when considering both alleles together). Here, we describe an individual with several clinical features of neonatal progeroid syndrome in whom exome sequencing revealed a homozygous nonsense variant in POLR3GL (NM_032305.2:c.358C>T; p.(Arg120Ter)). POLR3GL also encodes a subunit of RNA polymerase III and has recently been associated with endosteal hyperostosis and oligodontia in three patients with a phenotype distinct from the patient described here. Given the important role of POLR3GL in the same complex as the protein implicated in neonatal progeroid syndrome, the nature of the variant identified, our RNA studies suggesting nonsense-mediated decay, and the clinical overlap, we propose POLR3GL as a gene causing a variant of neonatal progeroid syndrome and therefore expand the phenotype associated with POLR3GL variants.

PMID:
31695177
DOI:
10.1038/s41431-019-0539-6

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