Transcription profiling of skeletal muscle from wild type and Nebulin knock-out mice
ABSTRACT: Knock out of the Nebulin gene. We compared the Quadriceps of two Nebulin -deficient vs. 2 Wildtype mice. The two KO-WT pairs derived from two litters (F2 generation, background: C57/Bl6 and 129/IB10).
The precise assembly of the highly organized filament systems found in muscle is critically important for its function. It has been hypothesized that nebulin, a giant filamentous protein extending along the entire length of the thin filament, provides a blueprint for muscle thin filament assembly. To test this hypothesis, we generated a KO mouse model to investigate nebulin functions in vivo. Nebulin KO mice assemble thin filaments of reduced lengths and approximately 15% of their Z-disks are ab ...[more]
Project description:Nebulin is a giant filamentous protein that is coextensive with the actin filaments of the skeletal muscle sarcomere. Nebulin mutations are the main cause of nemaline myopathy (NEM), with typical NEM adult patients having low expression of nebulin, yet the roles of nebulin in adult muscle remain poorly understood. To establish nebulin’s functional roles in adult muscle we performed studies on a novel conditional nebulin KO (Neb cKO) mouse model in which nebulin deletion was driven by the muscle creatine kinase (MCK) promotor. Neb cKO mice are born with high nebulin levels in their skeletal muscle but within weeks after birth nebulin expression rapidly falls to barely detectable levels Surprisingly, a large fraction of the mice survives to adulthood with low nebulin levels (<5% of control), contain nemaline rods, and undergo fiber-type switching towards oxidative types. These microarrays investigate the changes in gene expression when nebulin is deficient. Two skeletal muscle groups were studied: Quadriceps (which is markedly smaller in the Neb cKO mice relative to control) and Soleus (which is not significantly smaller in the Neb cKO relative to control). Six biological replicates for each muscle group were selected; all are age-matched males.
Project description:In the present study, we used a multimodal approach including protein and gene expression analysis and combined in vivo and in vitro measurements of force production. Overall, we aimed at investigating the functional impact of the expression of a single nebulin allele. Comparison of the miRNA expression profile of quadriceps in 3 nebulin wild type mice with 3 nebulin heterozygous mice.
Project description:In the present study, we used a multimodal approach including protein and gene expression analysis and combined in vivo and in vitro measurements of force production. Overall, we aimed at investigating the functional impact of the expression of a single nebulin allele. Comparison of the mRNA expression profile of quadriceps in 3 nebulin wild type mice with 3 nebulin heterozygous mice.
Project description:Genomic DNA was extracted from the livers of 5 22week old male mice, bisulfite converted and sequenced to ~30x coverage. The mice were obtained from two litters from an inbred agouti viable yellow colony. The individuals were isogenic but differed in their coat phenotype with one having a yellow coat, one a psuedoagouti coat and the remaining were phenotypically C57/BL6. The resulting DNA metylation profiles were investigated for individual differences in DNA methylation, including the identificaiton of novel metastable epialleles. Overall design: Whole genome bisulfite sequencing of liver DNA from five inbred male mice
Project description:Genome-wide gene expression analysis on tibialis anterior muscle from 2-month-old nebulin SH3 domain deleted (Neb∆SH3) mice compared to wildtype. Total RNA was obtained from biological triplicates of tibialis anterior muscle from 2-month-old nebulin SH3 domain deleted (Neb∆SH3) mice compared to wildtype.
Project description:Gene expression was analyzed in intestinal epithelial cells of germ-free and wildtype mice. Experiment Overall Design: Ileums and proximal colons of 4 C57/Bl6 control and 4 C57/BL6 germ-free mice were collected and embedded in OCT. Tissue sectioned (10 mikroM) and laser capture microscopy was performed using a Zeiss/Palm laser capture system. Total RNA was extracted from about 16000 cells of the catapulted samples using RNA microprep kit (Stratagene). These 16 000 cells derive from all 4 animals (pooled approx. 4 000 cells from each mouse). We retrieved between 50 and 150 ng total RNA. Fourty ng total RNA was expanded by two rounds of in vitro cRNA amplification and affymetrix genechip Moe403 were probed at the Swegene Resource Center Lund, Sweden. Array data analysis was performed using dCHIP2004 software.
Project description:This SuperSeries is composed of the following subset Series: GSE36741: In vivo and in vitro investigations of heterozygous nebulin knock-out mice reveal similarities with mild human form of nemaline myopathy [miRNA] GSE36743: In vivo and in vitro investigations of heterozygous nebulin knock-out mice reveal similarities with mild human form of nemaline myopathy [mRNA] Refer to individual Series
Project description:Foxi3 is a transcription factor expressed in the hair follicle epithelium during development and postnatally. In this study we used a microarray analysis to indentify differentially expressed genes in Foxi3 null epithelium compared to Foxi3 wt epithelium. We used E15.5 stage as the earliest time point when the Foxi3 null hair phenotype bacame obvious, to find out the most early consequences of Foxi3 ablation. Dispase-dissociated back skin epithelia of 4 Foxi3 total null and 4 wild-type E15.5 mouse embryos, littermates from 4 litters of C57/Bl6 background, were used for the analysis. Array and data analysis were performed in the Biomedicum Functional Genomics Unit (University of Helsinki, Finland).