The protein encoded by this gene is localized to primary cilia and centrosomes in ciliated human epithelial kidney cells and retinal pigment epithelial cells . RPGRIP1L colocalized at the basal body-centrosome complex with the proteins NPHP4, NPHP6, and TUBG1.[2][3]
Also, it can interact with MyosinVa [4]
A genetic variation within the RPGRIP1L gene, rs3213758, is associated with increased BMI.[7][8] Genetic variations strongly associated with obesity within the FTO gene have also been implicated in the control of RPGRIP1L expression.[9] Mice with decreased expression of RPGRIP1L are fatter, eat more, have diminished sensitivity to the hormone leptin that normally reduces food intake, and display altered morphology of the brain center that regulates feeding.[10][11][12] Similarly, cells derived from Joubert patients with RPGRIP1L mutations have decreased leptin sensitivity,[10][13] and neurons important for food intake segregating for obesity-risk variations at the FTO locus have decreased RPGRIP1L expression and diminished outgrowth.[12] These studies suggest that RPGRIP1L is a gene important in human obesity.
^ abDelous M, Baala L, Salomon R, Laclef C, Vierkotten J, Tory K, Golzio C, Lacoste T, Besse L, Ozilou C, Moutkine I, Hellman NE, Anselme I, Silbermann F, Vesque C, Gerhardt C, Rattenberry E, Wolf MT, Gubler MC, Martinovic J, Encha-Razavi F, Boddaert N, Gonzales M, Macher MA, Nivet H, Champion G, Berthélémé JP, Niaudet P, McDonald F, Hildebrandt F, Johnson CA, Vekemans M, Antignac C, Rüther U, Schneider-Maunoury S, Attié-Bitach T, Saunier S (July 2007). "The ciliary gene RPGRIP1L is mutated in cerebello-oculo-renal syndrome (Joubert syndrome type B) and Meckel syndrome". Nature Genetics. 39 (7): 875–81. doi:10.1038/ng2039. PMID17558409. S2CID6982566.
^Arts HH, Doherty D, van Beersum SE, Parisi MA, Letteboer SJ, Gorden NT, Peters TA, Märker T, Voesenek K, Kartono A, Ozyurek H, Farin FM, Kroes HY, Wolfrum U, Brunner HG, Cremers FP, Glass IA, Knoers NV, Roepman R (July 2007). "Mutations in the gene encoding the basal body protein RPGRIP1L, a nephrocystin-4 interactor, cause Joubert syndrome". Nature Genetics. 39 (7): 882–8. doi:10.1038/ng2069. PMID17558407. S2CID12910768.