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Trizuljak J, Duben J, Blaháková I, Vrzalová Z, Kozubík KS, Štika J, Radová L, Bergerová V, Mejstříková S, Hořínová V, Jančálek R, Pospíšilová Š, Doubek M. Extensive, 3.8 Mb-Sized Deletion of 22q12 in a Patient with Bilateral Schwannoma, Intellectual Disability, Sensorineural Hearing Loss, and Epilepsy. Mol Syndromol 2023; 14:439-448. [PMID: 37908896 PMCID: PMC10613852 DOI: 10.1159/000528744] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 10/13/2022] [Accepted: 12/13/2022] [Indexed: 11/02/2023] Open
Abstract
Introduction In contrast with the well-known and described deletion of the 22q11 chromosome region responsible for DiGeorge syndrome, 22q12 deletions are much rarer. Only a few dozen cases have been reported so far. This region contains genes responsible for cell cycle control, chromatin modification, transmembrane signaling, cell adhesion, and neural development, as well as several cancer predisposition genes. Case Presentation We present a patient with cleft palate, sensorineural hearing loss, vestibular dysfunction, epilepsy, mild to moderate intellectual disability, divergent strabism, pes equinovarus, platyspondylia, and bilateral schwannoma. Using Microarray-based Comparative Genomic Hybridization (aCGH), we identified the de novo 3.8 Mb interstitial deletion at 22q12.1→22q12.3. We confirmed deletion of the critical NF2 region by MLPA analysis. Discussion Large 22q12 deletion in the proband encases the critical NF2 region, responsible for development of bilateral schwannoma. We compared the phenotype of the patient with previously reported cases. Interestingly, our patient developed cleft palate even without deletion of the MN1 gene, deemed responsible in previous studies. We also strongly suspect the DEPDC5 gene deletion to be responsible for seizures, consistent with previously reported cases.
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Affiliation(s)
- Jakub Trizuljak
- Department of Medical Genetics and Genomics, Faculty of Medicine, Masaryk University and University Hospital Brno, Brno, Czech Republic
- Department of Internal Medicine - Hematology and Oncology, Faculty of Medicine, Masaryk University and University Hospital Brno, Brno, Czech Republic
- Central European Institute of Technology, Masaryk University, Brno, Czech Republic
| | - Jakub Duben
- Department of Medical Genetics and Genomics, Faculty of Medicine, Masaryk University and University Hospital Brno, Brno, Czech Republic
| | - Ivona Blaháková
- Department of Internal Medicine - Hematology and Oncology, Faculty of Medicine, Masaryk University and University Hospital Brno, Brno, Czech Republic
- Central European Institute of Technology, Masaryk University, Brno, Czech Republic
| | - Zuzana Vrzalová
- Department of Internal Medicine - Hematology and Oncology, Faculty of Medicine, Masaryk University and University Hospital Brno, Brno, Czech Republic
- Central European Institute of Technology, Masaryk University, Brno, Czech Republic
| | - Kateřina Staňo Kozubík
- Department of Internal Medicine - Hematology and Oncology, Faculty of Medicine, Masaryk University and University Hospital Brno, Brno, Czech Republic
- Central European Institute of Technology, Masaryk University, Brno, Czech Republic
| | - Jiří Štika
- Department of Medical Genetics and Genomics, Faculty of Medicine, Masaryk University and University Hospital Brno, Brno, Czech Republic
- Central European Institute of Technology, Masaryk University, Brno, Czech Republic
| | - Lenka Radová
- Central European Institute of Technology, Masaryk University, Brno, Czech Republic
| | - Veronika Bergerová
- Central European Institute of Technology, Masaryk University, Brno, Czech Republic
| | - Soňa Mejstříková
- Department of Internal Medicine - Hematology and Oncology, Faculty of Medicine, Masaryk University and University Hospital Brno, Brno, Czech Republic
- Central European Institute of Technology, Masaryk University, Brno, Czech Republic
| | - Věra Hořínová
- Department of Medical Genetics and Genomics, Faculty of Medicine, Masaryk University and University Hospital Brno, Brno, Czech Republic
- Outpatient Ward for Genetics, Hospital Jihlava, Jihlava, Czech Republic
| | - Radim Jančálek
- Department of Neurosurgery, St. Anne University Hospital, Brno, and Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Šárka Pospíšilová
- Department of Medical Genetics and Genomics, Faculty of Medicine, Masaryk University and University Hospital Brno, Brno, Czech Republic
- Department of Internal Medicine - Hematology and Oncology, Faculty of Medicine, Masaryk University and University Hospital Brno, Brno, Czech Republic
- Central European Institute of Technology, Masaryk University, Brno, Czech Republic
| | - Michael Doubek
- Department of Medical Genetics and Genomics, Faculty of Medicine, Masaryk University and University Hospital Brno, Brno, Czech Republic
- Department of Internal Medicine - Hematology and Oncology, Faculty of Medicine, Masaryk University and University Hospital Brno, Brno, Czech Republic
- Central European Institute of Technology, Masaryk University, Brno, Czech Republic
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