BACKGROUND: Mutations in the GRN gene are causative for an autosomal dominant form of frontotemporal dementia.
OBJECTIVE/METHODS: The objective of the present study is to describe clinical and molecular features of three siblings harboring the GRN deletion NM_002087.3:c.295_308delTGCCCACGGGGCTT, p.(Cys99Profs*15) identified with next generation sequencing.
RESULTS: Our patients demonstrated heterogeneous clinical phenotypes, such as progressive supranuclear palsy-like in the proband and the behavioral variant of frontotemporal dementia in the two affected siblings. Progranulin haploinsufficiency was revealed by both gene expression and protein analyses.
CONCLUSION: The pathogenicity of the novel GRN deletion c.295_308del TGCCCACGGGGCTT is confirmed by both functional analysis and segregation in three affected siblings.