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2015 ; 8
(6
): 527-41
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The Meckel-Gruber syndrome protein TMEM67 controls basal body positioning and
epithelial branching morphogenesis in mice via the non-canonical Wnt pathway
#MMPMID26035863
Abdelhamed ZA
; Natarajan S
; Wheway G
; Inglehearn CF
; Toomes C
; Johnson CA
; Jagger DJ
Dis Model Mech
2015[Jun]; 8
(6
): 527-41
PMID26035863
show ga
Ciliopathies are a group of developmental disorders that manifest with
multi-organ anomalies. Mutations in TMEM67 (MKS3) cause a range of human
ciliopathies, including Meckel-Gruber and Joubert syndromes. In this study we
describe multi-organ developmental abnormalities in the Tmem67(tm1Dgen/H1)
knockout mouse that closely resemble those seen in Wnt5a and Ror2 knockout mice.
These include pulmonary hypoplasia, ventricular septal defects, shortening of the
body longitudinal axis, limb abnormalities, and cochlear hair cell stereociliary
bundle orientation and basal body/kinocilium positioning defects. The basal
body/kinocilium complex was often uncoupled from the hair bundle, suggesting
aberrant basal body migration, although planar cell polarity and apical planar
asymmetry in the organ of Corti were normal. TMEM67 (meckelin) is essential for
phosphorylation of the non-canonical Wnt receptor ROR2
(receptor-tyrosine-kinase-like orphan receptor 2) upon stimulation with
Wnt5a-conditioned medium. ROR2 also colocalises and interacts with TMEM67 at the
ciliary transition zone. Additionally, the extracellular N-terminal domain of
TMEM67 preferentially binds to Wnt5a in an in vitro binding assay. Cultured lungs
of Tmem67 mutant mice failed to respond to stimulation of epithelial branching
morphogenesis by Wnt5a. Wnt5a also inhibited both the Shh and canonical
Wnt/?-catenin signalling pathways in wild-type embryonic lung. Pulmonary
hypoplasia phenotypes, including loss of correct epithelial branching
morphogenesis and cell polarity, were rescued by stimulating the non-canonical
Wnt pathway downstream of the Wnt5a-TMEM67-ROR2 axis by activating RhoA. We
propose that TMEM67 is a receptor that has a main role in non-canonical Wnt
signalling, mediated by Wnt5a and ROR2, and normally represses Shh signalling.
Downstream therapeutic targeting of the Wnt5a-TMEM67-ROR2 axis might, therefore,
reduce or prevent pulmonary hypoplasia in ciliopathies and other congenital
conditions.