The kinetochore protein, CENPF, is mutated in human ciliopathy and microcephaly phenotypes
Background: Mutations in microtubule-regulating genes are associated with disorders of neuronal migration and microcephaly. Regulation of centriole length has been shown to underlie the pathogenesis of certain ciliopathy phenotypes. Using a next-generation sequencing approach, we identified mutations in a novel centriolar disease gene in a kindred with an embryonic lethal ciliopathy phenotype and in a patient with primary microcephaly. Methods and results: Whole exome sequencing data from a non-consanguineous Caucasian kindred exhibiting mid-gestation lethality and ciliopathic malformations revealed two novel non-synonymous variants in CENPF, a microtubule-regulating gene. All four affected fetuses showed segregation for two mutated alleles [IVS5-2A>C, predicted to abolish the consensus splice-acceptor site from exon 6; c.1744G>T, p.E582X]. In a second unrelated patient exhibiting microcephaly, we identified two CENPF mutations [c.1744G>T, p.E582X; c.8692 C>T, p.R2898X] by whole exome sequencing. We found that CENP-F colocalised with Ninein at the subdistal appendages of the mother centriole in mouse inner medullary collecting duct cells. Intraflagellar transport protein-88 (IFT-88) colocalised with CENP-F along the ciliary axonemes of renal epithelial cells in age-matched control human fetuses but did not in truncated cilia of mutant CENPF kidneys. Pairwise co-immunoprecipitation assays of mitotic and serum-starved HEKT293 cells confirmed that IFT88 precipitates with endogenous CENP-F. Conclusions: Our data identify CENPF as a new centriolar disease gene implicated in severe human ciliopathy and microcephaly related phenotypes. CENP-F has a novel putative function in ciliogenesis and cortical neurogenesis.
Waters, AM; Asfahani, R; Carroll, P; Bicknell, L; Lescai, F; Bright, A; Chanudet, E; Brooks, A; Christou-Savina, S; Osman, G; Walsh, P; Bacchelli, C; Chapgier, A; Vernay, B; Bader, DM; Deshpande, C; O'Sullivan, M; Ocaka, L; Stanescu, H; Stewart, HS; Hildebrandt, F; Otto, E; Johnson, CA; Szymanska, K; Katsanis, N; Davis, E; Kleta, R; Hubank, M; Doxsey, S; Jackson, A; Stupka, E; Winey, M; Beales, PL
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