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  • 1
    In: Development, The Company of Biologists, Vol. 140, No. 6 ( 2013-03-15), p. 1330-1341
    Abstract: Dysfunction or death of photoreceptors is the primary cause of vision loss in retinal and macular degenerative diseases. As photoreceptors have an intimate relationship with the retinal pigment epithelium (RPE) for exchange of macromolecules, removal of shed membrane discs and retinoid recycling, an improved understanding of the development of the photoreceptor-RPE complex will allow better design of gene- and cell-based therapies. To explore the epigenetic contribution to retinal development we generated conditional knockout alleles of DNA methyltransferase 1 (Dnmt1) in mice. Conditional Dnmt1 knockdown in early eye development mediated by Rx-Cre did not produce lamination or cell fate defects, except in cones; however, the photoreceptors completely lacked outer segments despite near normal expression of phototransduction and cilia genes. We also identified disruption of RPE morphology and polarization as early as E15.5. Defects in outer segment biogenesis were evident with Dnmt1 exon excision only in RPE, but not when excision was directed exclusively to photoreceptors. We detected a reduction in DNA methylation of LINE1 elements (a measure of global DNA methylation) in developing mutant RPE as compared with neural retina, and of Tuba3a, which exhibited dramatically increased expression in mutant retina. These results demonstrate a unique function of DNMT1-mediated DNA methylation in controlling RPE apicobasal polarity and neural retina differentiation. We also establish a model to study the epigenetic mechanisms and signaling pathways that guide the modulation of photoreceptor outer segment morphogenesis by RPE during retinal development and disease.
    Type of Medium: Online Resource
    ISSN: 1477-9129 , 0950-1991
    Language: English
    Publisher: The Company of Biologists
    Publication Date: 2013
    detail.hit.zdb_id: 2007916-3
    SSG: 12
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  • 2
    In: Development, The Company of Biologists, ( 2016-01-01)
    Abstract: Defects in cilia-centrosomal genes cause pleiotropic clinical phenotypes, collectively called ciliopathies. Cilia biogenesis is initiated by interaction of positive and negative regulators. The centriolar coiled coil protein CP110 caps the distal end of mother centriole and is shown to act as a suppressor to control the timing of ciliogenesis. Here we demonstrate that CP110 promotes cilia formation in vivo unlike the findings in cultured cells. Cp110−/− mice die shortly after birth because of organogenesis defects as in ciliopathies. Shh signaling is impaired in null embryos, and primary cilia are reduced in multiple tissues. We show that CP110 is required for anchoring of basal bodies to membrane during cilia formation. CP110 loss resulted in abnormal distribution of core components of sub-distal appendages (SDA) and of recycling endosomes, which may be associated with premature extension of axonemal microtubules. Our data implicate CP110 in SDA assembly and ciliary vesicle docking, two requisite early steps in cilia formation. We suggest that CP110 has unique context-dependent functions acting as both a suppressor and a promoter of ciliogenesis.
    Type of Medium: Online Resource
    ISSN: 1477-9129 , 0950-1991
    Language: English
    Publisher: The Company of Biologists
    Publication Date: 2016
    detail.hit.zdb_id: 2007916-3
    SSG: 12
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  • 3
    Online Resource
    Online Resource
    The Company of Biologists ; 2015
    In:  Disease Models & Mechanisms Vol. 8, No. 2 ( 2015-02-01), p. 109-129
    In: Disease Models & Mechanisms, The Company of Biologists, Vol. 8, No. 2 ( 2015-02-01), p. 109-129
    Abstract: Retinal neurodegeneration associated with the dysfunction or death of photoreceptors is a major cause of incurable vision loss. Tremendous progress has been made over the last two decades in discovering genes and genetic defects that lead to retinal diseases. The primary focus has now shifted to uncovering disease mechanisms and designing treatment strategies, especially inspired by the successful application of gene therapy in some forms of congenital blindness in humans. Both spontaneous and laboratory-generated mouse mutants have been valuable for providing fundamental insights into normal retinal development and for deciphering disease pathology. Here, we provide a review of mouse models of human retinal degeneration, with a primary focus on diseases affecting photoreceptor function. We also describe models associated with retinal pigment epithelium dysfunction or synaptic abnormalities. Furthermore, we highlight the crucial role of mouse models in elucidating retinal and photoreceptor biology in health and disease, and in the assessment of novel therapeutic modalities, including gene- and stem-cell-based therapies, for retinal degenerative diseases.
    Type of Medium: Online Resource
    ISSN: 1754-8411 , 1754-8403
    Language: English
    Publisher: The Company of Biologists
    Publication Date: 2015
    detail.hit.zdb_id: 2451104-3
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  • 4
    In: Biology Open, The Company of Biologists
    Abstract: Protein inhibitor of activated Stat 3 (Pias3) is implicated in guiding specification of rod and cone photoreceptors through posttranslational modification of key retinal transcription factors. To investigate its role during retinal development, we deleted exon 2-5 of the mouse Pias3 gene, which resulted in complete loss of the Pias3 protein. Pias3−/- mice did not show any overt phenotype, and retinal lamination appeared normal even at 18 months. We detected reduced photopic b-wave amplitude by electroretinography following green light stimulation of postnatal day (P) 21 Pias3−/- retina, suggesting a compromised visual response of medium wavelength (M) cones. No change was evident in response of short wavelength (S) cones or rod photoreceptors until 7 months. Increased S-opsin expression in the M-cone dominant dorsal retina suggested altered distribution of cone photoreceptors. Transcriptome profiling of P21 and 18 month old Pias3−/- retina revealed aberrant expression of a subset of photoreceptor genes. Our studies demonstrate functional redundancy in SUMOylation-associated transcriptional control mechanisms and identify a specific though limited role of Pias3 in modulating spatial patterning and optimal function of cone photoreceptor subtypes in the mouse retina.
    Type of Medium: Online Resource
    ISSN: 2046-6390
    Language: English
    Publisher: The Company of Biologists
    Publication Date: 2017
    detail.hit.zdb_id: 2632264-X
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  • 5
    Online Resource
    Online Resource
    The Company of Biologists ; 2014
    In:  Biology Open Vol. 3, No. 9 ( 2014-09-15), p. 861-870
    In: Biology Open, The Company of Biologists, Vol. 3, No. 9 ( 2014-09-15), p. 861-870
    Abstract: Planar cell polarity (PCP) signaling plays a critical role in tissue morphogenesis. In mammals, disruption of three of the six “core PCP” components results in polarity-dependent defects with rotated cochlear hair cell stereocilia and open neural tube. We recently demonstrated a role of Prickle1, a core PCP molecule in Drosophila, in mammalian neuronal development. To examine Prickle1 function along a broader developmental window, we generated three mutant alleles in mice. We show that the complete loss of Prickle1 leads to systemic tissue outgrowth defects, aberrant cell organization and disruption of polarity machinery. Curiously, Prickle1 mutants recapitulate the characteristic features of human Robinow syndrome and phenocopy mouse mutants with Wnt5a or Ror2 gene defects, prompting us to explore an association of Prickle1 with the Wnt pathway. We show that Prickle1 is a proteasomal target of Wnt5a signaling and that Dvl2, a target of Wnt5a signaling, is misregulated in Prickle1 mutants. Our studies implicate Prickle1 as a key component of the Wnt-signaling pathway and suggest that Prickle1 mediates some of the WNT5A-associated genetic defects in Robinow syndrome.
    Type of Medium: Online Resource
    ISSN: 2046-6390
    Language: English
    Publisher: The Company of Biologists
    Publication Date: 2014
    detail.hit.zdb_id: 2632264-X
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  • 6
    Online Resource
    Online Resource
    The Company of Biologists ; 2016
    In:  Journal of Cell Science Vol. 129, No. 10 ( 2016-05-15), p. e1.1-e1.1
    In: Journal of Cell Science, The Company of Biologists, Vol. 129, No. 10 ( 2016-05-15), p. e1.1-e1.1
    Type of Medium: Online Resource
    ISSN: 1477-9137 , 0021-9533
    Language: English
    Publisher: The Company of Biologists
    Publication Date: 2016
    detail.hit.zdb_id: 219171-4
    detail.hit.zdb_id: 1483099-1
    SSG: 12
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