Genomic Context and Mechanisms of the Mutation in Fibrodysplasia Ossificans Progressiva.

Basic research in Fibrodysplasia Ossificans Progressiva (FOP) was carried out in the various fields involved in the disease pathophysiology and was important for designing therapeutic approaches, some of which were already developed as ongoing or planned clinical trials. Genetic research was fundamental in identifying the FOP causative mutation, and the astonishing progress in technologies for genomic analysis, coupled to related computational methods, now make possible further research in this field. We present here a review of molecular and cellular factors which could explain why a single mutation, the R206H in the gene, is absolutely prevalent in FOP patients. We also address the mechanisms by which FOP expressivity could be modulated by -acting variants in the genomic region in human chromosome 2q. Finally, we also discuss the general issue of genetic modifiers in FOP.