1. Integration of Phenotype Term Prioritization and Gene Expression Analysis Reveals a Novel Variant in the PERP Gene Associated with Autosomal Recessive Erythrokeratoderma.
- Author
-
González-Quintana, Adrián, Garrido-Moraga, Rocío, Palencia-Pérez, Sara I., Hernández-Martín, Ángela, Sánchez-Munárriz, Jon, Lezana-Rosales, José M., Quesada-Espinosa, Juan F., Martín, Miguel A., and Arteche-López, Ana
- Subjects
GENE expression ,RECESSIVE genes ,GENETIC variation ,PHENOTYPES ,HUMAN phenotype ,MOLECULAR diagnosis - Abstract
Hereditary palmoplantar keratodermas (PPKs) are a clinically and genetically heterogeneous group of disorders characterized by excessive epidermal thickening of palms and soles. Several genes have been associated with PPK including PERP, a gene encoding a crucial component of desmosomes that has been associated with dominant and recessive keratoderma. We report a patient with recessive erythrokeratoderma (EK) in which whole exome sequencing (WES) prioritized by human phenotype ontology (HPO) terms revealed the presence of the novel variant c.153C > A in the N-terminal region the PERP gene. This variant is predicted to have a nonsense effect, p.(Cys51Ter), resulting in a premature stop codon. We demonstrated a marked reduction in gene expression in cultured skin fibroblasts obtained from the patient. Despite the PERP gene is expressed at low levels in fibroblasts, our finding supports a loss-of-function (LoF) mechanism for the identified variant, as previously suggested in recessive EK. Our study underscores the importance of integrating HPO analysis when using WES for molecular genetic diagnosis in a clinical setting, as it facilitates continuous updates regarding gene–clinical feature associations. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF