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Retinas from the Pex1-G844D mouse model of Zellweger spectrum disorder

ABSTRACT: Gene expression analysis of retinas from a mouse model of the mild form of Zellweger spectrum disorder (ZSD). Mice homozygous for the hypomorphic Pex1-G844D allele, the murine ortholog of the human PEX1-G843D mutation found in a subset of patients with autosomal recessive ZSD, develop phenotypes found in humans with a milder form of ZSD, including retinal degeneration and vision loss. Similar to humans, mice heterozygous for the hypomorphic Pex1-G844D allele do not display age-related retinal abnormalities. We conducted a comparative analysis of retinal gene expression profile from Pex1-G844D homozygous and heterozygous mice in order to investigate the pathomechanisms of vision loss in humans with mild forms of ZSD. Whole retinas were obtained from 4 mice homozygous and 4 mice heterozygous for the hypomorphic Pex1-G844D allele, the murine ortholog of the human PEX1-G843D mutation found in a subset of patients with autosomal recessive Zellweger spectrum disorder (ZSD). The former group of animals show abnormal age-related related retinal degeneration due to peroxisome assembly defect resulting from having two copies of the hypomorphic Pex1-G844D allele. The latter group of animals display no evidence of abnormal age-related retinal degeneration due to the presence of one wild type copy of the Pex1 gene. The overall goal was to identify differentially expressed genes between mice homozygous and heterozygous for the hypomorphic Pex1-G844D allele that are informative of the pathomechanisms of age-related retinal degeneration in the former group.

ORGANISM(S): Mus musculus

SUBMITTER: Joseph Hacia

PROVIDER: E-GEOD-52348 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Retinas from the Pex1-G844D mouse model of Zellweger spectrum disorder

Project description:Gene expression analysis of retinas from a mouse model of the mild form of Zellweger spectrum disorder (ZSD). Mice homozygous for the hypomorphic Pex1-G844D allele, the murine ortholog of the human PEX1-G843D mutation found in a subset of patients with autosomal recessive ZSD, develop phenotypes found in humans with a milder form of ZSD, including retinal degeneration and vision loss. Similar to humans, mice heterozygous for the hypomorphic Pex1-G844D allele do not display age-related retinal abnormalities. We conducted a comparative analysis of retinal gene expression profile from Pex1-G844D homozygous and heterozygous mice in order to investigate the pathomechanisms of vision loss in humans with mild forms of ZSD.

2013-12-15 | GSE52348 | GEO

A Mutation in Transmembrane Protein 135 Impairs Lipid Metabolism in Mouse Eyecups

Project description:Aging is a significant factor in the development of age-related diseases but the molecular underpinnings of how aging disrupts cellular homeostasis to cause retinal disease is unknown. Here, we further our studies on Transmembrane protein 135 (Tmem135), a gene involved in retinal aging, by examining the transcriptomic profiles of wildtype, heterozygous and homozygous Tmem135 mutant posterior eyecup samples through RNA sequencing (RNA-Seq). We found significant gene expression changes in both heterozygous and homozygous Tmem135 mutant mouse eyecups that correlates with visual function deficits. Further analysis revealed many genes involved in lipid metabolism are changed due to the Tmem135 mutation. We confirm these changes by finding increased lipid accumulation in mutant Tmem135 eyecup samples. Since mutant Tmem135 mice have similar ocular pathologies as human age-related macular degeneration (AMD) eyes, we compared our homozygous Tmem135 mutant eyecup RNA-Seq dataset with datasets of human AMD donor eyes. We find similar changes in genes involved in lipid metabolism between the homozygous Tmem135 mutant eyecups and AMD donor eyes. Our study suggests that the Tmem135 mutation affects lipid metabolism as similarly observed in human AMD eyes, thus Tmem135 mutant mice can serve as a good model for the role of dysregulated lipid metabolism in AMD.

2021-09-22 | GSE184160 | GEO

A framework to identify functional interactors that contribute to disrupted early retinal development in Vsx2 mutant mice III

Project description:These datasets contain the transcriptomes from E12.5 mouse retinal tissues from embryos carrying three different combinations of the Vsx2 ocular retardation J (orJ) allele and the Mitf mi (mi) allele: orJ-heterozygous, which serves as the control, orJ-homozygous, and orJ-homozygous; mi-heterozygous. The orJ allele is a recessive loss of function and the mi allele is semi-dominant. Mitf is direct target of repression by Vsx2 in the retina and is an established causal factor in the orJ ocular phenotype of microphthalmia. The goal of this analysis was to determine if blocking Mitf function in the orJ mutant would restore retinal gene expression to wild type levels. All libraries were prepared and sequenced together, facilitating direct comparisons of the gene expression profiles across the 3 genotypes.

2023-05-19 | GSE227055 | GEO

Mus musculus

Project description:Age-related retinal degeneration study in mice

| PRJNA119485 | ENA

A framework to identify functional interactors that contribute to disrupted early retinal development in Vsx2 mutant mice

Project description:This SuperSeries is composed of the SubSeries listed below. The Vsx2 homeobox gene is expressed in the newly formed retinal domain during early eye development and mutations in the Vsx2 gene cause congenital microphthalmia. The primary disruptions in the early retina are compromised retinal identity (lineage infidelity), reduced proliferation, and delayed neurogenesis. One goal of the study was to use gene expression profiling to predict genetic interactions between Vsx2 and candidate functional interactors that contribute to the early retinal phenotype of the Vsx2-null mouse strain ocular retardation J (orJ). The orJ allele is a spontaneous, recessive allele caused by the presence of a premature stop codon in the Vsx2 homeodomain. The datasets contained within are from three independent experimental designs. One was to compare the retinal gene expression profiles from E12.5 embryos that are one of three genotypes: the orJ-homozygous mutant, the combinatorial orJ; Mitfmi heterozygous mutant, and the orJ-heterozygous mouse (control). Another analysis was to compare the gene expression profiles of E12.5 orJ-homozygous mutant retinal tissues cultured for 24 hour in the presence or absence of the RXR antagonist HX531. The other analysis was to compare the gene expression profiles of E12.5 orJ-homozygous mutant retinal tissues cultured for 24 hour in the presence or absence of the gamma-Secretase antagonist Dibenzazipine (DBZ).

2023-05-19 | GSE227056 | GEO

Actl7b-deficiency leads to mislocalization of LC8 type dynein light chains and disruption of murine spermatogenesis

Project description:Actin-related proteins (Arp) are classified according to their similarity to actin and are involved in diverse cellular processes. ACTL7B is a testis-specific Arp and highly conserved in rodents and primates. ACTL7B is specifically expressed in round and elongating spermatids during spermiogenesis. Here, we have generated an Actl7b-null allele in mice to unravel the role of ACTL7B in sperm formation. Male mice homozygous for the Actl7b-null allele (Actl7b-/-) were infertile, while heterozygous males (Actl7b+/-) were fertile. Severe spermatid defects such as detached acrosomes, disrupted membranes and failed elongation of the axoneme start to appear at spermiogenesis step 9 in Actl7b-/- mice, finally resulting in spermatogenic arrest. Abnormal spermatids, were degraded. Co-immunoprecipitation experiments identified interaction between ACTL7B and the LC8 dynein light chains DYNLL1 and DYNLL2, which are first detected in step 9 spermatids and mislocalized when ACTL7B is absent. Our data unequivocally establishes that mutations in ACTL7B are directly related to male infertility, pressing for additional research in men.

2023-10-19 | PXD038920 | Pride

Comparative genomic hybridization of mouse liver and tumors from Acd mutant and wild type strains in p53 deficient background

Project description:DNA from tumors of 10 male mice were competitively hybridized with DNA from liver samples from the same mouse on NimbleGen CGH arrays to assess copy number changes in the tumors. Four of the mice were wildtype for Acd (ortholog of human TPP1), 2 of which were p53-/- and 2 of which were p53-/+. The other 6 mice were homozygous for the mutant acd allele of Acd. 3 of these mice were p53-/- and the other 3 were p53-/+. Mice were crosses from double heterozygote parental mice. These parental mice were crosses of heterozygous Acd mutant mice (in a mixed DW/JxCAST/Ei background) with heterozygous null p53 mice (C57BL6/J; Trp53-tm1Tyj).

2009-04-07 | E-TABM-680 | biostudies-arrayexpress

Gene expression changes in mouse hematopoietic stem cell enriched populations following the loss of Meis1 expression

Project description:Hematopoietic stem cell enriched Lin-Sca1+cKit+ cells were isolated from heterozygous and homozygous transgenic mice with a loxP-flanked Meis1 allele following in vivo allele deletion.

2016-02-04 | E-MTAB-4133 | biostudies-arrayexpress

The alarmin IL-33 amplifies an immune response in the degenerating retina

Project description:ST2 heterodimerizes with IL-1RAcp to form the receptor for IL-33, which is primarily associated with allergic inflammation by inducing Th2 responses. Recently, however, IL-33 was found to be expressed in the central nervous system and in retinal Muller cells which imply functions, as yet undescribed, beyond Th2 mediated inflammation. Muller cells support the health of the retina and photoreceptors and are also involved in inflammation in retinal degeneration. It is not known how IL-33/ST2 functions in this capacity. We recently found that ST2 ko mice are protected from CLE-induced photoreceptor loss, implying a detrimental effect of IL33/ST2 in CLE. We wish to perform microarray analysis using WT and ST2 KO mice in CLE model to better understand the mechanism by which IL-33/ST2 regulates retinal degeneration. CLE (Constant Light Exposure) is a model of retinal damage/degeneration in mice. Mice are exposed to bright light 24 hours a day for a period of time which damages retina photoreceptors. This damage is assessed by histology, optical coherence tomography (OCT), which measures retina thickness in vivo. In this experiment, the WT and ST2 KO mice (5 mice per genotype per time point) will be exposed to 1200-lux constant light for 0, 3, 10 days. The retinal RNA will be isolated and analyzed for differential gene expression by microarray.

2015-12-17 | E-GEOD-74695 | biostudies-arrayexpress

Expression in the dorsal telencephalon of E13.5 conditional Dicer KO mice

Project description:To study the effect of miRNA depletion in the embryonic forebrain, we isolated RNA from E13.5 dorsal telencephalon of mice homozygous for a floxed Dicer allele and hemizygous for the forebrain expressed Emx1Cre (Dicer KO mice). These samples were compared to littermates heterozygous for the floxed allele and hemizygous for Emx1Cre.

2012-08-30 | GSE37610 | GEO

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