Deep intronic NIPBL de novo mutations and differential diagnoses revealed by whole genome and RNA sequencing in Cornelia de Lange syndrome patients

Autor: Juliette Coursimault, Kévin Cassinari, François Lecoquierre, Olivier Quenez, Sophie Coutant, Céline Derambure, Myriam Vezain, Nathalie Drouot, Gabriella Vera, Elise Schaefer, Anaïs Philippe, Bérénice Doray, Laëtitia Lambert, Jamal Ghoumid, Thomas Smol, Mélanie Rama, Marine Legendre, Didier Lacombe, Patricia Fergelot, Robert Olaso, Anne Boland, Jean‐François Deleuze, Alice Goldenberg, Pascale Saugier‐Veber, Gaël Nicolas
Rok vydání: 2022
Předmět:
Zdroj: Human mutationREFERENCES. 43(12)
ISSN: 1098-1004
Popis: Cornelia de Lange syndrome (CdLS; MIM# 122470) is a rare developmental disorder. Pathogenic variants in 5 genes explain approximately 50% cases, leaving the other 50% unsolved. We performed whole genome sequencing (WGS) ± RNA sequencing (RNA-seq) in 5 unsolved trios fulfilling the following criteria: (i) clinical diagnosis of classic CdLS, (ii) negative gene panel sequencing from blood and saliva-isolated DNA, (iii) unaffected parents' DNA samples available and (iv) proband's blood-isolated RNA available. A pathogenic de novo mutation (DNM) was observed in a CdLS differential diagnosis gene in 3/5 patients, namely POU3F3, SPEN, and TAF1. In the other two, we identified two distinct deep intronic DNM in NIPBL predicted to create a novel splice site. RT-PCRs and RNA-Seq showed aberrant transcripts leading to the creation of a novel frameshift exon. Our findings suggest the relevance of WGS in unsolved suspected CdLS cases and that deep intronic variants may account for a proportion of them.
Databáze: OpenAIRE
Externí odkaz: