Craniofacial features of POLR3-related leukodystrophy caused by biallelic variants inPOLR3A,POLR3BandPOLR1C

Autor: Amytice Mirchi, Simon-Pierre Guay, Luan T Tran, Nicole I Wolf, Adeline Vanderver, Bernard Brais, Michel Sylvain, Daniela Pohl, Elsa Rossignol, Michael Saito, Sebastien Moutton, Luis González-Gutiérrez-Solana, Isabelle Thiffault, Michael C Kruer, Dolores Gonzales Moron, Marcelo Kauffman, Cyril Goizet, László Sztriha, Emma Glamuzina, Serge B Melançon, Sakkubai Naidu, Jean-Marc Retrouvey, Suzanne Lacombe, Beatriz Bernardino-Cuesta, Isabelle De Bie, Geneviève Bernard
Rok vydání: 2023
Předmět:
Zdroj: Journal of Medical Genetics. :jmg-2023
ISSN: 1468-6244
0022-2593
DOI: 10.1136/jmg-2023-109223
Popis: BackgroundRNA polymerase III-related or 4H leukodystrophy (POLR3-HLD) is an autosomal recessive hypomyelinating leukodystrophy characterized by neurological dysfunction, hypodontia and hypogonadotropic hypogonadism. The disease is caused by biallelic pathogenic variants inPOLR3A,POLR3B,POLR1CorPOLR3K. Craniofacial abnormalities reminiscent of Treacher Collins syndrome have been originally described in patients with POLR3-HLD caused by biallelic pathogenic variants inPOLR1C. To date, no published studies have appraised in detail the craniofacial features of patients with POLR3-HLD. In this work, the specific craniofacial characteristics of patients with POLR3-HLD associated with biallelic pathogenic variants inPOLR3A,POLR3BandPOLR1Care described.MethodsThe craniofacial features of 31 patients with POLR3-HLD were evaluated, and potential genotype–phenotype associations were evaluated.ResultsVarious craniofacial abnormalities were recognized in this patient cohort, with each individual presenting at least one craniofacial abnormality. The most frequently identified features included a flat midface (61.3%), a smooth philtrum (58.0%) and a pointed chin (51.6%). In patients withPOLR3Bbiallelic variants, a thin upper lip was frequent. Craniofacial anomalies involving the forehead were most commonly associated with biallelic variants inPOLR3AandPOLR3Bwhile a higher proportion of patients withPOLR1Cbiallelic variants demonstrated bitemporal narrowing.ConclusionThrough this study, we demonstrated that craniofacial abnormalities are common in patients with POLR3-HLD. This report describes in detail the dysmorphic features of POLR3-HLD associated with biallelic variants inPOLR3A,POLR3BandPOLR1C.
Databáze: OpenAIRE
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