Several components of the ciliary cargo transport system known as intraflagellar transport (IFT) were also implicated in the pathogenesis of JATD including IFT80 (MIM 611177) (10), TTC21B/IFT139 (MIM 612014) (11), IFT140 (MIM 614620) (12), WDR19/IFT144 (MIM 608151) (13), WDR34 (MIM 613363) (14), WDR60 (MIM 615462) (15), and IFT172 (MIM 607386) (8). This evidence concerns the gene TTC21B and Jeune syndrome.