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Wegler M, Roth C, Schumann E, Kogan J, Totten E, Guillen Sacoto MJ, Abou Jamra R, Hornemann F. Congenital cervical spine malformation due to bi-allelic RIPPLY2 variants in spondylocostal dysostosis type 6. Clin Genet 2021; 99:565-571. [PMID: 33410135 DOI: 10.1111/cge.13916] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Revised: 12/30/2020] [Accepted: 01/02/2021] [Indexed: 01/14/2023]
Abstract
RIPPLY2 is an essential part of the formation of somite patterning during embryogenesis and in establishment of rostro-caudal polarity. Here, we describe three individuals from two families with compound-heterozygous variants in RIPPLY2 (NM_001009994.2): c.238A > T, p.(Arg80*) and c.240-4 T > G, p.(?), in two 15 and 20-year-old sisters, and a homozygous nonsense variant, c.238A > T, p.(Arg80*), in an 8 year old boy. All patients had multiple vertebral body malformations in the cervical and thoracic region, small or absent rib involvement, myelopathies, and common clinical features of SCDO6 including scoliosis, mild facial asymmetry, spinal spasticity and hemivertebrae. The nonsense variant can be classified as likely pathogenic based on the ACMG criteria while the splice variants must be classified as a variant of unknown significance. With this report on two further families, we confirm RIPPLY2 as the gene for SCDO6 and broaden the phenotype by adding myelopathy with or without spinal canal stenosis and spinal spasticity to the symptom spectrum.
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Affiliation(s)
- Meret Wegler
- Department of Human Genetics, University of Leipzig, Leipzig, Saxony, Germany
| | - Christian Roth
- Division of Pediatric Radiology, University Hospital Leipzig, Leipzig, Saxony, Germany
| | - Eckehard Schumann
- Department of Orthopedic, Trauma and Plastic Surgery, University Hospital Leipzig, Leipzig, Saxony, Germany
| | - Jillene Kogan
- Centre of Medical Genetics, Advocate Medical Group, Park Ridge, Illinois, USA
| | - Ellen Totten
- Centre of Medical Genetics, Advocate Medical Group, Park Ridge, Illinois, USA
| | | | - Rami Abou Jamra
- Department of Human Genetics, University of Leipzig, Leipzig, Saxony, Germany
| | - Frauke Hornemann
- Department of Pediatric Neurology, University Hospital for Children and Adolescents, Leipzig, Saxony, Germany
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Serey-Gaut M, Scala M, Reversade B, Ruaud L, Cabrol C, Musacchia F, Torella A, Accogli A, Escande-Beillard N, Langlais J, Piatelli G, Consales A, Nigro V, Capra V, Van Maldergem L. Congenital posterior cervical spine malformation due to biallelic c.240-4T>G RIPPLY2 variant: A discrete entity. Am J Med Genet A 2020; 182:1466-1472. [PMID: 32212228 DOI: 10.1002/ajmg.a.61549] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2019] [Revised: 02/24/2020] [Accepted: 02/26/2020] [Indexed: 01/25/2023]
Abstract
The clinical and radiological spectrum of spondylocostal dysostosis syndromes encompasses distinctive costo-vertebral anomalies. RIPPLY2 biallelic pathogenic variants were described in two distinct cervical spine malformation syndromes: Klippel-Feil syndrome and posterior cervical spine malformation. RIPPLY2 is involved in the determination of rostro-caudal polarity and somite patterning during development. To date, only four cases have been reported. The current report aims at further delineating the posterior malformation in three new patients. Three patients from two unrelated families underwent clinical and radiological examination through X-ray, 3D computed tomography and brain magnetic resonance imaging. After informed consent was obtained, family-based whole exome sequencing (WES) was performed. Complex vertebral segmentation defects in the cervico-thoracic spine were observed in all patients. WES led to the identification of the homozygous splicing variant c.240-4T>G in all subjects. This variant is predicted to result in aberrant splicing of Exon 4. The current report highlights a subtype of cervical spine malformation with major atlo-axoidal malformation compromising spinal cord integrity. This distinctive mutation-specific pattern of malformation differs from Klippel-Feil syndrome and broadens the current classification, defining a sub-type of RIPPLY2-related skeletal disorder. Of note, the phenotype of one patient overlaps with oculo-auriculo-vertebral spectrum disorder.
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Affiliation(s)
- Margaux Serey-Gaut
- Centre de génétique humaine, Université de Franche Comté, Besançon, France
| | - Marcello Scala
- Department of Neurosciences, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health, University of Genoa, Genoa, Italy.,Department of Neurosurgery, IRCCS Istituto Giannina Gaslini, Genoa, Italy
| | - Bruno Reversade
- Institute of Molecular and Cell Biology, A*STAR, Singapore, Singapore.,Laboratory of Human Embryology and Genetics, Institute of Medical Biology, A*STAR, Singapore, Singapore.,Medical Genetics Department, Koç University School of Medicine, Istanbul, Turkey
| | - Lyse Ruaud
- Université de Paris, Paris, France.,Service de génétique clinique, AP-HP, Hôpital Robert Debré, Paris, France
| | - Christelle Cabrol
- Centre de génétique humaine, Université de Franche Comté, Besançon, France
| | | | - Annalaura Torella
- Telethon Institute of Genetics and Medicine, Naples, Italy.,Department of Precision Medicine, University of Campania 'Luigi Vanvitelli', Naples, Italy
| | - Andrea Accogli
- Department of Neurosciences, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health, University of Genoa, Genoa, Italy.,Department of Neurosurgery, IRCCS Istituto Giannina Gaslini, Genoa, Italy
| | - Nathalie Escande-Beillard
- Institute of Molecular and Cell Biology, A*STAR, Singapore, Singapore.,Medical Genetics Department, Koç University School of Medicine, Istanbul, Turkey
| | - Jean Langlais
- Department of Pediatric Orthopedic Surgery, University Hospital, Université de Franche Comté, Besançon, France
| | - Gianluca Piatelli
- Department of Neurosurgery, IRCCS Istituto Giannina Gaslini, Genoa, Italy
| | | | - Vincenzo Nigro
- Telethon Institute of Genetics and Medicine, Naples, Italy.,Department of Precision Medicine, University of Campania 'Luigi Vanvitelli', Naples, Italy
| | - Valeria Capra
- Department of Neurosurgery, IRCCS Istituto Giannina Gaslini, Genoa, Italy
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Bettini LR, Locatelli L, Mariani M, Cianci P, Giussani C, Canonico F, Cereda A, Russo S, Gervasini C, Biondi A, Selicorni A. Cervical spine malformation in cornelia de lange syndrome: a report of three patients. Am J Med Genet A 2014; 164A:1520-4. [PMID: 24668777 DOI: 10.1002/ajmg.a.36457] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2013] [Accepted: 01/03/2014] [Indexed: 12/11/2022]
Abstract
Cornelia de Lange syndrome (CdLS) is a complex genetic disease with skeletal involvement mostly related to upper limb malformations. We report on three males with clinical and molecular diagnoses of CdLS. Besides typical CdLS features, all showed different cervical spine malformations. To the best of our knowledge, this is an unusual malformation in the CdLS phenotypic spectrum.
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Affiliation(s)
- Laura Rachele Bettini
- Pediatric Department at Monza Brianza per il Bambino e la sua Mamma (MBBM) Foundation, Pediatric Genetic Unit, San Gerardo Hospital, Monza, Italy
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