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Recent studies have identified the molecular defect underlying autosomal dominant osteogenesis imperfecta (OI) type V. Unlike all other OI types, which are characterized by high genetic heterogeneity, OI type V appears consistently associated to a unique de novo C&gt;T transition within the 5' UTR of the IFITM5 gene. Although the precise frequency of OI type V is not known, this recurrent base substitution may well represent a mutational hotspot in the human genome. We show that it occurs at a CpG dinucleotide that is highly methylated in several tissues and particularly in the sperm DNA, suggesting a mutational mechanism common to other de novo recurrent dominant mutations.

The recurrent causal mutation for osteogenesis imperfecta type V occurs at a highly methylated CpG dinucleotide within the IFITM5 gene