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https://doi.org/10.1007/s11033-024-09835-5
Copy DOIJournal: Molecular biology reports | Publication Date: Aug 8, 2024 |
Global developmental delay with speech and behavioral abnormalities (OMIM: 619243) is an autosomal dominant disease caused by variants in TNRC6B gene. We reviewed and summarized clinical manifestations and genotypes in patients previously reported with TNRC6B gene variants. We used several prediction tools to predict pathogenicity and performed minigene assays to verify the function of the synonymous variant affecting RNA splicing. The patient presented with convulsive seizures and developmental delay. WES combined with functional studies diagnosed a child with a synonymous variant in TNRC6B gene. Through minigene assay and Sanger sequencing, we demonstrated that c.3141G > A variant induced exon 7 skipping and the synonymous variant was pathogenic. Synonymous variants do not change the amino acids encoded by the codon, so we usually consider synonymous variants to be benign and ignore their pathogenicity. Minigene assay is a valuable tool to identify the effect of variation on RNA splicing and identify synonymous variants' benign or pathogenic. We showed that the synonymous variant was pathogenic by minigene assay. WES combined with minigene assay establishes a robust basis for genetic counseling and diagnosing diseases.
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