1. NBAS pathogenic variants: Defining the associated clinical and facial phenotype and genotype-phenotype correlations.
- Author
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Carli D, Giorgio E, Pantaleoni F, Bruselles A, Barresi S, Riberi E, Licciardi F, Gazzin A, Baldassarre G, Pizzi S, Niceta M, Radio FC, Molinatto C, Montin D, Calvo PL, Ciolfi A, Fleischer N, Ferrero GB, Brusco A, and Tartaglia M
- Subjects
- Child, Child, Preschool, Female, Genetic Association Studies, Humans, Loss of Function Mutation, Male, Neoplasm Proteins chemistry, Pedigree, Protein Domains, Abnormalities, Multiple genetics, Neoplasm Proteins genetics, Silent Mutation, Exome Sequencing methods
- Abstract
The pathogenic variants in the neuroblastoma-amplified sequence (NBAS) are associated with a clinical spectrum involving the hepatic, skeletal, ocular, and immune systems. Here, we report on two unrelated subjects with a complex phenotype solved by whole-exome sequencing, who shared a synonymous change in NBAS that was documented to affect the transcript processing and co-occurring with a truncating change. Starting from these two cases, we systematically assessed the clinical information available for all subjects with biallelic NBAS pathogenic variants (73 cases in total). We revealed a recognizable facial profile (hypotelorism, thin lips, pointed chin, and "progeroid" appearance) determined by using DeepGestalt facial recognition technology, and we provide evidence for the occurrence of genotype-phenotype correlations. Notably, severe hepatic involvement was associated with variants affecting the NBAS-Nter and Sec39 domains, whereas milder liver involvement and immunodeficiency were generally associated with variants located at the N-terminus and C-terminus of the protein. Remarkably, no patient was reported to carry two nonsense variants, suggesting lethality of complete NBAS loss-of-function., (© 2019 Wiley Periodicals, Inc.)
- Published
- 2019
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