uORF-introducing variants in the 5'UTR of the NIPBL gene as a cause of Cornelia de Lange syndrome.
Hum Mutat
; 43(9): 1239-1248, 2022 09.
Article
em En
| MEDLINE
| ID: mdl-35446447
ABSTRACT
Cornelia de Lange syndrome (CdLS) is a clinically-recognizable rare developmental disorder. About 70% of patients carry a missense or loss-of-function pathogenic variant in the NIPBL gene. We hypothesized that some variants in the 5'-untranslated region (UTR) of NIPBL may create an upstream open reading frame (uORF), putatively leading to a loss of function. We searched for NIPBL 5'-UTR variants potentially introducing uORF by (i) reannotating NGS data of 102 unsolved CdLS patients and (ii) literature and variant databases search. We set up a green fluorescent protein (GFP) reporter assay and studied NIPBL expression in a lymphoblastoid cell line (LCL). We identified two variants introducing a novel ATG codon sequence in the 5'-UTR of NIPBL, both predicted to introduce uORF a novel c.-457_-456delinsAT de novo mutation in a 15-year-old male with classic CdLS, and a c.-94C>T variant in a published family. Our reporter assay showed a significant decrease of GFP levels in both mutant contexts, with similar levels of messenger RNA (mRNA) as compared to wt constructs. Assessment of LCL of one patient showed consistent results with decreased NIPBL protein and unchanged mRNA levels. 5'-UTR uORF-introducing NIPBL variants may represent a rare source of pathogenic variants in unsolved CdLS patients.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Síndrome de Cornélia de Lange
Tipo de estudo:
Diagnostic_studies
/
Prognostic_studies
Limite:
Adolescent
/
Humans
/
Male
Idioma:
En
Revista:
Hum Mutat
Assunto da revista:
GENETICA MEDICA
Ano de publicação:
2022
Tipo de documento:
Article
País de afiliação:
França