Abstract
Paget’s disease of bone (PDB) is a common late-onset bone disorder characterized by focal areas of abnormal bone remodeling. Positional cloning efforts resulted in the identification of seven genetic loci (PDB1-7) with putative involvement in the pathogenesis of PDB. Meanwhile, the PDB-causing gene from the PDB3 region on chromosome 5q35 has been identified as the SQSTM1 gene. All mutations identified in this gene so far are located in or close to the ubiquitin-associated (UBA) domain of the protein. In 2001, we reported genotyping results of genetic markers located in the PDB3 region in an extended American family, indicating the involvement of the PDB3 locus. Here, we report the identification of a novel mutation (G1205C) in the SQSTM1 gene in this family. The G1205C mutation is located in the splice donor site of intron 7 and reverse-transcription polymerase chain reaction experiments showed that the presence of the C allele results in the production of two abnormal mRNA transcripts. Translation of the first transcript would result in a protein that lacks amino acids 351-388, including 26 amino acids of the second PEST domain in addition to two amino acids of the UBA domain. The second mutant mRNA transcript could result in a truncated protein (390X) that lacks almost the complete UBA domain. PDB mutations that disrupt the function of the PEST domain of SQSTM1 have not been reported before, so probably the pathogenic effect of both transcripts resides in the disruption of the ubiquitin-binding properties of the protein.
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Acknowledgment
This research was funded by a network of excellence grant (Eurobonet) from the European Union (FP6), a research grant (G.0117.06) from the Fonds voor wetenschappelijk onderzoek, and a research grant from the Paget Foundation (all to W. V. H).
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Beyens, G., Wuyts, W., Cleiren, E. et al. Identification and Molecular Characterization of a Novel Splice-Site Mutation (G1205C) in the SQSTM1 Gene Causing Paget’s Disease of Bone in an Extended American Family. Calcif Tissue Int 79, 281–288 (2006). https://doi.org/10.1007/s00223-006-0122-3
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DOI: https://doi.org/10.1007/s00223-006-0122-3