期刊
HUMAN MOLECULAR GENETICS
卷 21, 期 6, 页码 1272-1286出版社
OXFORD UNIV PRESS
DOI: 10.1093/hmg/ddr557
关键词
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资金
- UK Medical Research Council [G0700073]
- Egyptian Government
- European Community [241955 SYSCILIA]
- Wellcome Trust
- Kidney Research UK
- Beit Memorial Fellowship for Medical Research
- Royal Society
- E.P. Araham Trust
- GlaxoSmithKline
- MRC [G1001644, G0802359, G0700073] Funding Source: UKRI
- Kidney Research UK [JF1/2009] Funding Source: researchfish
- Medical Research Council [G0802359, G1001644, G0700073] Funding Source: researchfish
MKS3, encoding the transmembrane receptor meckelin, is mutated in MeckelGruber syndrome (MKS), an autosomal-recessive ciliopathy. Meckelin localizes to the primary cilium, basal body and elsewhere within the cell. Here, we found that the cytoplasmic domain of meckelin directly interacts with the actin-binding protein filamin A, potentially at the apical cell surface associated with the basal body. Mutations in FLNA, the gene for filamin A, cause periventricular heterotopias. We identified a single consanguineous patient with an MKS-like ciliopathy that presented with both MKS and cerebellar heterotopia, caused by an unusual in-frame deletion mutation in the meckelin C-terminus at the region of interaction with filamin A. We modelled this mutation and found it to abrogate the meckelinfilamin A interaction. Furthermore, we found that loss of filamin A by siRNA knockdown, in patient cells, and in tissues from Flna(Dilp2) null mouse embryos results in cellular phenotypes identical to those caused by meckelin loss, namely basal body positioning and ciliogenesis defects. In addition, morpholino knockdown of flna in zebrafish embryos significantly increases the frequency of dysmorphology and severity of ciliopathy developmental defects caused by mks3 knockdown. Our results suggest that meckelin forms a functional complex with filamin A that is disrupted in MKS and causes defects in neuronal migration and Wnt signalling. Furthermore, filamin A has a crucial role in the normal processes of ciliogenesis and basal body positioning. Concurrent with these processes, the meckelinfilamin A signalling axis may be a key regulator in maintaining correct, normal levels of Wnt signalling.
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