Project description:Investigation of whole genome gene expression level changes in mouse 4T1 mammary tumors expressing Cebpb shRNA, compared to 4T1 tumors expressing control shRNA. Analysis of mouse 4T1 mammary tumors expressing Cebpb shRNA compared to control shRNA are further described in Johansson & Berg et al 2012.
Project description:Investigation of whole genome gene expression level changes in mouse 4T1 mammary tumors expressing Cebpb shRNA, compared to 4T1 tumors expressing control shRNA. Analysis of mouse 4T1 mammary tumors expressing Cebpb shRNA compared to control shRNA are further described in Johansson & Berg et al 2012. A 10 chip study using total RNA recovered from five separate 4T1 tumors expressing Cebpb shRNA and five separate 4T1 tumors expressing control shRNA. All tumors were surgically removed after subcutaneous implantation in syngeneic BALB/c mice two weeks earlier. Each chip measures the expression level of 44,170 genes from Mus Musculus with fourteen 24-mer probe pairs (PM/MM) per gene, with three-fold technical redundancy.
Project description:4T1 is a mammary tumor cell line to which the NFAT1 transcription factor is essential for tumorigenesis and metastasis. control or shRNA transduced 4T1 cells growing in culture were collected and RNA was extracted from each sample and processed for hybridization to Affymetrix arrays.
Project description:4T1 mouse mammary carcinoma cells have an autocrine FGFR active loop leading to constitutive activation of downstream signaling pathways. We found that FGFR inhibitors have a strong effect on 4T1 tumors in-vivo. We used microarray to understand the contribution of FGFR signaling to the tumor formation upon TKI258 treatment. 4T1 cells were injected in the 4th mammary gland of Balb/C mice. After 7 days, daily treatment with TKI258 or water was performed for 14 days. At the end of the experiment, the RNA were extracted from three individual tumors per condition and hybridized on Affimetrix microarrays.
Project description:4T1 mouse mammary carcinoma cells have an autocrine FGFR active loop leading to constitutive activation of downstream signaling pathways. We found that FGFR inhibitors have a strong effect on 4T1 tumors in-vivo. We used microarray to understand the contribution of FGFR signaling to the tumor formation upon TKI258 treatment.
Project description:PAPAS is an antisense transcript of rRNA genes and mediates silencing of the locus in non-dividing cells. Here, we have analyzed PAPAS function in lactogenic differentiation of mammary epithelial cells (HC11 cells) and in mammary cancer cells (4T1). Using doxycycline (Dox) inducible shRNA against PAPAS, we found that the knockdown perturbs differentiation and inhibits expression of lactogenic genes. In contrast, Dox-inducible overexpression of PAPAS in 4T1 cells suppresses genes required for ribosome biogenesis and slows down the neoplastic growth.
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.