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Expanding the pre- and postnatal phenotype of WASHC5 and CCDC22 -related Ritscher-Schinzel syndromes
Abstract
Ritscher-Schinzel syndrome (RTSCS) is a rare genetic condition characterized by peculiar craniofacial features and cerebellar and cardiovascular malformations. To date, four genes are implicated in this condition. The first two genes described were the autosomal recessive inherited gene WASHC5 associated with Ritscher-Schinzel syndrome 1 (RTSCS1), and CCDC22, an X-linked recessive gene causing Ritscher-Schinzel syndrome 2 (RTSCS2). In recent years, two other genes have been identified: VPS35L (RTSCS3) and DPYSL5 (RTSCS4). Only few patients with a molecular diagnosis of RTSCS have been reported, leaving the phenotypical spectrum and genotype-phenotype correlations ill-defined. We expand the number of genetically confirmed patients with RTSCS1 and 2; reporting three live born and three terminated pregnancies from two unrelated families. Four siblings carried compound heterozygous variants in WASHC5 while two siblings harboured a hemizygous CCDC22 variant. The most common findings in all patients were craniofacial dysmorphism, particularly macrocephaly, down slanted palpebral fissures and low set-ears. Developmental delay, intellectual disability and ataxic gait were present in all patients. One of the patients with the CCDC22 variant presented pubertas tarda. Elevation of nuchal translucency was observed in the first trimester ultrasound in three foetuses with compound heterozygous variants in WASHC5. None of the patients had epilepsy. The pre- and postnatal findings of this co…
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Mutations in WASHC5, CCDC22, and VPS35L result in 3C/Ritscher-Schinzel syndrome.
“Over the past decade, mutations in additional genes, CCDC22 and VPS35L, that also result in 3 C/Ritscher-Schinzel syndrome have been reported [3–7].”
From CCDC22 mutations that impair COMMD binding cause attenuated 3C/Ritscher-Schinzel syndrome (2025) · cites this paper as [6]
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CCDC22: a novel candidate gene for syndromic X-linked intellectual disability
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Structure of the endosomal Commander complex linked to Ritscher-Schinzel syndrome
Healy, M. D., McNally, K. E., Butkovič, R., Chilton, M., Kato, K., Sacharz, J., McConville, C., Moody, E. R. R., Shaw, S., Planelles-Herrero, V. J., et al. (2023) · Cell · doi:10.1016/j.cell.2023.04.003 · Cited by 91
Ritscher-Schinzel syndrome can be characterized as an endosomal recyclinopathy
Kato, K., Nishio, Y., McMillan, K. J., Al-Maraghi, A., Kroes, H. Y., Abdel-Hamid, M. S., Jones, E., Shaw, S., Yoshida, A., Otsuji, S., et al. (2025) · Science Translational Medicine · doi:10.1126/scitranslmed.adt2426 · Cited by 7
CCDC22 mutations that impair COMMD binding cause attenuated 3C/Ritscher-Schinzel syndrome
Singla, A., Rogers, C., Touma, M.-J., El-Najjar, Y., Colley, A., Boesch, D. J., Billadeau, D. D., Gecz, J., Chen, B., & Burstein, E. (2025) · BMC Medical Genomics · doi:10.1186/s12920-025-02168-7 · Cited by 1
Metadata
- Authors
- Neri, S., Maia, N., Fortuna, A. M., Damasio, J., Coale, E., Willis, M., Jorge, P., Højte, A. F., Fenger, C. D., Møller, R. S., & Bayat, A.
- Venue
- European Journal of Medical Genetics
- Publisher
- Elsevier BV
- Published
- 2022-11
- Volume
- 65
- Issue
- 11
- Pages
- 104624
- ISSN
- 1769-7212
- Cited by
- 16
- References
- 2
- Language
- en
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