TTLL5 and inherited retinal dystrophy: Interestingly, in mice, the RPGRORF15 (the photoreceptor-specific ORF15 variant of retinitis pigmentosa GTPase regulator) implicated in retinal dystrophy actually localizes to connecting cilia of photoreceptors and is glutamylated by TTLL5 in vivo (Rao et al., 2016).