Publications

Authors:

Piubelli, Chiara; Castagna, Annalisa; Marchi, Giacomo; Rizzi, Monica; Busti, Fabiana; Badar, Sadaf; Marchetti, Monia; De Gobbi, Marco; Roetto, Antonella; Xumerle, Luciano; Suku, Eda; Giorgetti, Alejandro; Delledonne, Massimo; Olivieri, Oliviero; Girelli, Domenico

Title:

Identification of new BMP6 pro-peptide mutations in patients with iron overload

Year:

2017

Type of item:

Articolo in Rivista

Tipologia ANVUR:

Articolo su rivista

Language:

Inglese

Referee:

No

Name of journal:

American Journal of Hematology

ISSN of journal:

0361-8609

N° Volume:

92

Number or Folder:

6

Page numbers:

562-568

Keyword:

BMP6; Iron overload; Next Generation Sequencing

Short description of contents:

Hereditary Hemochromatosis (HH) is a genetically heterogeneous disorder caused by mutations in at least five different genes (HFE, HJV, TFR2, SLC40A1, HAMP) involved in the production or activity of the liver hormone hepcidin, a key regulator of systemic iron homeostasis. Nevertheless, patients with an HH-like phenotype that remains completely/partially unexplained despite extensive sequencing of known genes are not infrequently seen at referral centers, suggesting a role of still unknown genetic factors. A compelling candidate is Bone Morphogenetic Protein 6 (BMP6), which acts as a major activator of the BMP-SMAD signaling pathway, ultimately leading to the upregulation of hepcidin gene transcription. A recent seminal study by French authors has described three heterozygous missense mutations in BMP6 associated with mild to moderate late-onset iron overload (IO). Using an updated next-generation sequencing (NGS)-based genetic test in IO patients negative for the classical HFE p.Cys282Tyr mutation, we found three BMP6 heterozygous missense mutations in four patients from three different families. One mutation (p.Leu96Pro) has already been described and proven to be functional. The other two (p.Glu112Gln, p.Arg257His) were novel, and both were located in the pro-peptide domain known to be crucial for appropriate BMP6 processing and secretion. In silico modeling also showed results consistent with their pathogenetic role. The patients' clinical phenotypes were similar to that of other patients with BMP6-related IO recently described. Our results independently add further evidence to the role of BMP6 mutations as likely contributing factors to late-onset moderate IO unrelated to mutations in the established five HH genes.

Product ID:

97427

Handle IRIS:

11562/962378

Last Modified:

November 15, 2022

Bibliographic citation:

Piubelli, Chiara; Castagna, Annalisa; Marchi, Giacomo; Rizzi, Monica; Busti, Fabiana; Badar, Sadaf; Marchetti, Monia; De Gobbi, Marco; Roetto, Antonella; Xumerle, Luciano; Suku, Eda; Giorgetti, Alejandro; Delledonne, Massimo; Olivieri, Oliviero; Girelli, Domenico, Identification of new BMP6 pro-peptide mutations in patients with iron overload «American Journal of Hematology» , vol. 92 , n. 6 , 2017 , pp. 562-568

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