Project description:We report the distribution of histone H3K4me1 and H3K27ac within the genome of mouse embryonic midbrain. We prepared the chromatin from 11 dpc embryonic midbrain and made chromatin precipitation with antibody against H3K4me1 and H3K27ac (rabbit polyclonal antibody). High-throughput sequencing applied for the ChIP analysis revealed the differential distribution of modified histone within developing midbrain. ChIP analysis of mouse 11 dpc embryonic midbrain and forelimb buds against anti-H3K4me1 and H3K27ac antibody.
Project description:We report the distribution of histone H3K4me1 and H3K27ac within the genome of mouse embryonic midbrain. We prepared the chromatin from 11 dpc embryonic midbrain and made chromatin precipitation with antibody against H3K4me1 and H3K27ac (rabbit polyclonal antibody). High-throughput sequencing applied for the ChIP analysis revealed the differential distribution of modified histone within developing midbrain.
Project description:Lmx1b regulates dorsalization of limb fates, but the mechanism of this regulation has not been characterized. To identify candidate genes regulated by Lmx1b we compared the limbs from Lmx1b KO mice to wild type mice during limb dorsalization (e11.5-13.5). Differentially expressed genes that we common to all three stages examined were considered to be likely candidates for Lmx1b regulation and further evaluated. At 11.5 and 12.5 dpc, embryos were harvested and the limb buds with the limb girdles were isolated. Embryos at 13.5dpc were also harvested and their distal limb buds (zeugopods and autopods) were isolated. Embryos were genotyped to confirm Lmx1b homozygosity (-/- or +/+). RNA from embryonic forelimbs and hindlimbs of wild type (WT) and Lmx1b KO mice was harvested using the Rneasy Kit (Qiagen). RNA was pooled to decrease genetic variability, i.e., six limbs at 11.5 dpc, three limbs at 12.5 dpc and six limbs at 13.5 dpc. Duplicate samples were generated using different embryos for each stage and then hybridized to the Affymetrix GeneChip® Mouse Genome 430 2.0 Array (UCI, Irvine, CA).
Project description:The aim of this study was to analyze the gene expression profile for three main cell lines (supporting, interstitial/stromal, and germ cells) isolated from developing gonads at the critical period of sexual differentiation (between 11.5, and 13.5 dpc). Three cell lines (supporting, interstitial/stromal, and germ cells) were isolated from murine fetal XX and XY gonads at three time points (11.5, 12.5, and 13.5 dpc). Transgenic mouse strains with the expression of cell type specific fluorescent markers were used to isolate the cell lines. Cells were sorted using FACS method and then the RNA was extracted.
Project description:Introgressed variants from other species can be an important source of genetic variation because they may arise rapidly, can include multiple mutations on a single haplotype, and have often been pretested by selection in the species of origin. Although introgressed alleles are generally deleterious, several studies have reported introgression as the source of adaptive alleles-including the rodenticide-resistant variant of Vkorc1 that introgressed from Mus spretus into European populations of Mus musculus domesticus. Here, we conducted bidirectional genome scans to characterize introgressed regions into one wild population of M. spretus from Spain and three wild populations of M. m. domesticus from France, Germany, and Iran. Despite the fact that these species show considerable intrinsic postzygotic reproductive isolation, introgression was observed in all individuals, including in the M. musculus reference genome (GRCm38). Mus spretus individuals had a greater proportion of introgression compared with M. m. domesticus, and within M. m. domesticus, the proportion of introgression decreased with geographic distance from the area of sympatry. Introgression was observed on all autosomes for both species, but not on the X-chromosome in M. m. domesticus, consistent with known X-linked hybrid sterility and inviability genes that have been mapped to the M. spretus X-chromosome. Tract lengths were generally short with a few outliers of up to 2.7 Mb. Interestingly, the longest introgressed tracts were in olfactory receptor regions, and introgressed tracts were significantly enriched for olfactory receptor genes in both species, suggesting that introgression may be a source of functional novelty even between species with high barriers to gene flow.
Project description:Understanding congenital liver disease requires elucidation of the signaling pathways and transcriptional events in the developing liver. Comprehensive assessment of gene expression between 10.5 and 16.5 dpc in the developing mouse liver and comparison with adult liver and non-hepatic embryonic tissue was validated with real-time PCR and in situ hybridization. The broad nature of the analysis provides insights into patterns of genetic control of hepatogenesis. Pathways implicated in human disease are highly regulated at the transcriptional level. Rather than activating or inhibiting a pathway or biological process by altering the expression of a single signaling molecule, transcriptional changes in large numbers of genes in a pathway or process are regulated in a coordinated manner. For example, both TGF-beta and Notch signaling is inhibited during hepatogenesis not just by decreasing transcription of multiple pathway members, but also with a complementary increase in the transcription of a pathway inhibitor. Similarly, genes related to specific biological processes exhibit strong temporal synchronization in which multiple members of the pathway have similar transcriptional regulation over time. Global coordination of signaling or functional families at the transcriptional level may be a mechanism to produce robustness of the desired outcomes. In addition, this comprehensive analysis provides a database for the further study of transcriptional events during liver development by identifying liver-specific, highly regulated genes. Experiment Overall Design: In order to provide transcriptional profile of the developing liver compared both to normal adult liver and non-hepatic embryonic tissueswe performed high-density microarray analysis using Affymetrix MG 430 2.0 chips for embryonic liver samples at 10.5, 11.5, 12.5, 13.5, 14.5, and 16.5 days post conception (dpc), embryo-minus liver tissues at 10.5, 11.5, 12.5, and 14.5 dpc, and normal 10-week-old adult mouse liver. Each sample consisted of at least five embryos.
Project description:The aim of this study was to analyze the gene expression profile for three main cell lines (supporting, interstitial/stromal, and germ cells) isolated from developing gonads at the critical period of sexual differentiation (between 11.5, and 13.5 dpc).
Project description:Translational research is commonly performed in the C57B6/J mouse strain, chosen for its genetic homogeneity and phenotypic uniformity. Here, we evaluate the suitability of the white-footed deer mouse (Peromyscus leucopus) as a model organism for aging research, offering a comparative analysis against C57B6/J and diversity outbred (DO) Mus musculus strains. Our study includes comparisons of body composition, skeletal muscle function, and cardiovascular parameters, shedding light on potential applications and limitations of P. leucopus in aging studies. Notably, P. leucopus exhibits distinct body composition characteristics, emphasizing reduced muscle force exertion and a unique metabolism, particularly in fat mass. Cardiovascular assessments showed changes in arterial stiffness, challenging conventional assumptions and highlighting the need for a nuanced interpretation of aging-related phenotypes. Our study also highlights inherent challenges associated with maintaining and phenotyping P. leucopus cohorts. Behavioral considerations, including anxiety-induced responses during handling and phenotyping assessment, pose obstacles in acquiring meaningful data. Moreover, the unique anatomy of P. leucopus necessitates careful adaptation of protocols designed for Mus musculus. While showcasing potential benefits, further extensive analyses across broader age ranges and larger cohorts are necessary to establish the reliability of P. leucopus as a robust and translatable model for aging studies.