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Imagawa E, Moreta L, Misra VK, Newman C, Konuma T, Oishi K. Functional insight into a neurodevelopmental disorder caused by missense variants in an RNA-binding protein, RBM10. J Hum Genet 2023; 68:643-648. [PMID: 37268768 DOI: 10.1038/s10038-023-01162-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 05/07/2023] [Accepted: 05/11/2023] [Indexed: 06/04/2023]
Abstract
The RNA-binding motif protein 10, RBM10, is an RNA splicing regulator essential for development. Loss-of-function RBM10 variants are associated with TARP syndrome, a severe X-linked recessive condition in males. We report a 3-year-old male with a mild phenotype, consisting of cleft palate, hypotonia, developmental delay, and minor dysmorphisms, associated with a missense RBM10 variant, c.943T>C, p.Ser315Pro, affecting the RRM2 RNA-binding domain. His clinical features were similar to a previously reported case associated with a missense variant. The p.Ser315Pro mutant protein was expressed normally in the nucleus, but its expression level and protein stability were slightly reduced. Nuclear magnetic resonance spectroscopy showed that the structure and the RNA-binding ability of the RRM2 domain with the p.Ser315Pro were unaffected. However, it affects the alternative splicing regulations of downstream genes, NUMB and TNRC6A, and its splicing alteration patterns were variable depending on target transcripts. In summary, a novel germline missense RBM10 p.Ser315Pro variant that causes functional changes in the expression of its downstream genes results in a non-lethal phenotype associated with developmental delays. The functional alteration effects depend on the residues affected by missense variants. Our findings are expected to bring broader insights into the RBM10-associated genotype-phenotype relationships by delineating the molecular mechanism of RBM10 functions.
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Affiliation(s)
- Eri Imagawa
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Department of Pediatrics, The Jikei University School of Medicine, Tokyo, Japan
| | - Latisha Moreta
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Rejuvenating Fertility Center, New York, NY, USA
| | - Vinod K Misra
- Discipline of Pediatrics, Central Michigan University School of Medicine, Mt. Pleasant, MI, USA
- Division of Genetic, Genomic, and Metabolic Disorders, Children's Hospital of Michigan, Detroit, MI, USA
| | - Claire Newman
- Division of Genetic, Genomic, and Metabolic Disorders, Children's Hospital of Michigan, Detroit, MI, USA
- Prenatal Diagnosis and Medical Genetic Program, Mount Sinai Hospital, Toronto, ON, Canada
| | - Tsuyoshi Konuma
- Graduate School of Medical Life Science, Yokohama City University, Yokohama, Japan
| | - Kimihiko Oishi
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, USA.
- Department of Pediatrics, The Jikei University School of Medicine, Tokyo, Japan.
- Department of Pediatrics, Icahn School of Medicine at Mount Sinai, New York, NY, USA.
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Samara OA, Alzoubi O, Gharaibeh AM, Alnajjar Q, Alawwa I. Isolated Persistent Left Superior Vena Cava Associated With Autosomal Dominant Polycystic Kidney Disease (ADPKD): Challenges and Clinical Significance. Cureus 2022; 14:e22890. [PMID: 35399489 PMCID: PMC8986345 DOI: 10.7759/cureus.22890] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/06/2022] [Indexed: 11/05/2022] Open
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