title: RPGRIP1 is essential for normal rod photoreceptor outer segment elaboration and morphogenesis.
abstract: The function of the retinitis pigmentosa GTPase regulator interacting protein 1 (RPGRIP1) gene is currently not known. However, mutations within the gene lead to Leber Congenital Amaurosis and autosomal recessive retinitis pigmentosa in human patients. In a previously described knockout mouse model of the long splice variant of Rpgrip1, herein referred to as Rpgrip1(tm1Tili) mice, mislocalization of key outer segment proteins and dysmorphogenesis of outer segment discs preceded subsequent photoreceptor degeneration. In this report, we describe a new mouse model carrying a splice acceptor site mutation in Rpgrip1, herein referred to as Rpgrip1(nmf247) that is phenotypically distinct from Rpgrip1(tm1Tili) mice. Photoreceptor degeneration in homozygous Rpgrip1(nmf247) mice is earlier in onset and more severe when compared with Rpgrip1(tm1Tili) mice. Also, ultrastructural studies reveal that whereas Rpgrip1(nmf247) mutants have a normal structure and number of connecting cilia, unlike Rpgrip1(tm1Tili) mice, they do not elaborate rod outer segments (OS). Therefore, in addition to its role in OS disc morphogenesis, RPGRIP1 is essential for rod OS formation. Our study indicates the absence of multiple Rpgrip1 isoforms in Rpgrip1(nmf247) mice, suggesting different isoforms may play different roles in photoreceptors and underscores the importance of considering splice variants when generating targeted null mutations.
authors.affiliation: The Jackson Laboratory, Bar Harbor, ME 04609, USA.
authors.forename: Jungyeon
authors.initials: J
authors.lastname: Won
authors.forename: Elaine
authors.initials: E
authors.lastname: Gifford
authors.forename: Richard S
authors.initials: RS
authors.lastname: Smith
authors.forename: Haiqing
authors.initials: H
authors.lastname: Yi
authors.forename: Paulo A
authors.initials: PA
authors.lastname: Ferreira
authors.forename: Wanda L
authors.initials: WL
authors.lastname: Hicks
authors.forename: Tiansen
authors.initials: T
authors.lastname: Li
authors.forename: Jürgen K
authors.initials: JK
authors.lastname: Naggert
authors.forename: Patsy M
authors.initials: PM
authors.lastname: Nishina
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D003598:Cytoskeletal Proteins; D004195:Disease Models, Animal; D005260:Female; D006801:Humans; D008297:Male; D051379:Mice; D008811:Mice, Inbred DBA; D008969:Molecular Sequence Data; D009024:Morphogenesis; D009154:Mutation; D021381:Protein Transport; D011506:Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D012160:Retina / Q000254:growth & development* / Q000378:metabolism; D012174:Retinitis Pigmentosa / Q000235:genetics / Q000378:metabolism*; D012374:Rod Cell Outer Segment / Q000737:chemistry / Q000378:metabolism*; D016415:Sequence Alignment
chemical_list: D003598:Cytoskeletal Proteins; D011506:Proteins; C540216:Rpgrip1 protein, mouse
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