Fiche publication
Date publication
octobre 2017
Journal
The Journal of clinical investigation
Auteurs
Membres identifiés du Cancéropôle Est :
Pr BAHRAM Siamak
,
Pr CHENARD Marie-Pierre
,
Dr GOETZ Jacky
,
Dr LEFEBVRE Olivier
,
Pr FAIVRE Laurence
,
Dr CARAPITO Raphaël
,
Dr OSMANI Naël
Tous les auteurs :
Carapito R, Konantz M, Paillard C, Miao Z, Pichot A, Leduc MS, Yang Y, Bergstrom KL, Mahoney DH, Shardy DL, Alsaleh G, Naegely L, Kolmer A, Paul N, Hanauer A, Rolli V, Müller JS, Alghisi E, Sauteur L, Macquin C, Morlon A, Sancho CS, Amati-Bonneau P, Procaccio V, Mosca-Boidron AL, Marle N, Osmani N, Lefebvre O, Goetz JG, Unal S, Akarsu NA, Radosavljevic M, Chenard MP, Rialland F, Grain A, Béné MC, Eveillard M, Vincent M, Guy J, Faivre L, Thauvin-Robinet C, Thevenon J, Myers K, Fleming MD, Shimamura A, Bottollier-Lemallaz E, Westhof E, Lengerke C, Isidor B, Bahram S
Lien Pubmed
Résumé
Shwachman-Diamond syndrome (SDS) (OMIM #260400) is a rare inherited bone marrow failure syndrome (IBMFS) that is primarily characterized by neutropenia and exocrine pancreatic insufficiency. Seventy-five to ninety percent of patients have compound heterozygous loss-of-function mutations in the Shwachman-Bodian-Diamond syndrome (sbds) gene. Using trio whole-exome sequencing (WES) in an sbds-negative SDS family and candidate gene sequencing in additional SBDS-negative SDS cases or molecularly undiagnosed IBMFS cases, we identified 3 independent patients, each of whom carried a de novo missense variant in srp54 (encoding signal recognition particle 54 kDa). These 3 patients shared congenital neutropenia linked with various other SDS phenotypes. 3D protein modeling revealed that the 3 variants affect highly conserved amino acids within the GTPase domain of the protein that are critical for GTP and receptor binding. Indeed, we observed that the GTPase activity of the mutated proteins was impaired. The level of SRP54 mRNA in the bone marrow was 3.6-fold lower in patients with SRP54-mutations than in healthy controls. Profound reductions in neutrophil counts and chemotaxis as well as a diminished exocrine pancreas size in a SRP54-knockdown zebrafish model faithfully recapitulated the human phenotype. In conclusion, autosomal dominant mutations in SRP54, a key member of the cotranslation protein-targeting pathway, lead to syndromic neutropenia with a Shwachman-Diamond-like phenotype.
Mots clés
Animals, Bone Marrow Diseases, genetics, Child, DNA Mutational Analysis, Exocrine Pancreatic Insufficiency, genetics, Female, Genetic Association Studies, Humans, Infant, Lipomatosis, genetics, Male, Models, Molecular, Neutropenia, congenital, Pancreas, Exocrine, metabolism, Phenotype, Protein Domains, Signal Recognition Particle, chemistry, Zebrafish
Référence
J. Clin. Invest.. 2017 Oct;:
