Project description:This SuperSeries is composed of the following subset Series: GSE40734: The effect on gene expression of Smchd1 deletion in primary MEFs, transformed MEFs and MEF tumours GSE40879: The effect on gene expression of Smchd1 deletion in pre-B cells from E17.5 Eµ-Myc embryos GSE40880: The effect on gene expression of Smchd1 deletion in end stage lymphomas GSE40881: The effect on gene expression of Smchd1 deletion in premalignant pre-B cells Refer to the individual subSeries. NOTE: all the cell types need to be analyzed separately.
Project description:Smchd1 appears to act as a tumour suppressor in the Eµ-Myc B cell lymphoma model. We find gene expression differences are most pronounced in the premalignant cells, and observe more variability in end stage lymphomas. We always detect a small number of clustered genes and imprinted genes as differentially expressed, along with others involved in tumorigenesis. The microarrays compared Smchd1 null and Smchd1 wildtype samples from end stage lymphomas. All lymphomas are on the C57BL/6 background and carry the Eµ-Myc transgene, and Smchd1 null samples are additionally homozygous for a Smchd1 genetrap allele.
Project description:Smchd1 appears to act as a tumour suppressor in the Eµ-Myc B cell lymphoma model. We find gene expression differences are most pronounced in the premalignant cells, and observe more variability in end stage lymphomas. We always detect a small number of clustered genes and imprinted genes as differentially expressed, along with others involved in tumorigenesis.
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.