The transmembrane Frizzled-like receptor Tmem67/MKS-3, a transition zone protein that functionally binds Wnt5a (Abdelhamed et al., 2015) and whose mutations are responsible for the MKS and JBTS ciliopathies, has moreover been located to the PC base of the C. elegans ciliated sensory neurons (Williams et al., 2010). This evidence concerns the gene TMEM67 and Meckel syndrome, type 1.