Differences in the epigenetic modification of somatic cloned cattle from different types of donors still exist after reprogramming and differentiation
Ontology highlight
ABSTRACT: To investigate the differences in the epigenetic modification of somatic cloned cattle from different types of donors after reprogramming and differentiation,we established Six cell lines of cloned cattle from different donor nuclei (three strains derived from fetal fibroblasts, numbered FFB1, FFB2, and FFB3, and another three strains derived from fetal oviduct epithelial cells, numbered FOV1, FOV2, and FOV3)
Project description:Differences in the epigenetic modification of somatic cloned cattle from different types of donors still exist after reprogramming and differentiation
Project description:A major unresolved issue in the cloning of mammals by somatic cell nuclear transfer (SCNT) is the mechanism by which the process fails after embryos are transferred to the uterus of recipients, prior to or during the implantation window. We investigated this problem by using RNA-seq to compare the transcriptomes in cattle conceptuses produced by SCNT and artificial insemination (AI) at d18 (pre-implantation) and d34 (post-implantation) of gestation. In addition, endometrium was profiled in order to identify the communication pathways that might be affected by the presence of a cloned conceptus, ultimately leading to mortality prior to or during the implantation window. At d18, the effects on the transcriptome associated with SCNT were massive, involving more than 5,000 differentially expressed genes (DEGs). Among them are 121 genes that have embryonic lethal phenotypes in mice, cause defects in trophoblast and placental development, and/or affect conceptus survival in mice. In endometria at d18, <0.4% of expressed genes were affected by the presence of a cloned conceptus, whereas at d34, ~36% and <0.7% of genes were differentially expressed in intercaruncular and caruncular tissues, respectively. Functional analysis of DEGs in placental and endometrial tissues suggests a major disruption of signaling between the cloned conceptus and the endometrium, particularly the intercaruncular tissue. Our results support a bottleneck model for cloned conceptus survival during the peri-implantation period determined by gene expression levels in extra-embryonic tissues and the endometrial response to altered signaling from clones.
Project description:This project aimed to discover the protein-based biomarkers for tick resistance in cattle using cattle skin samples. The cattle were phenotyped into two groups, tick-resistant and susceptible after artificial tick challenge. Mean tick scores were used to categorise cattle. The SWATH analysis was sued to measure the relative abundance of proteins in skin samples of the two groups at different time points.
Project description:This project aimed to discover the protein-based biomarkers for tick resistance in cattle using cattle serum samples. The cattle were phenotyped into two groups, tick-resistant and susceptible after an artificial tick challenge. Mean tick scores were used to categorise cattle. The SWATH analysis was sued to measure the relative abundance of proteins in skin samples of the two groups at different time points.
Project description:Trophoblast stem cells (TSCs) are derived from the trophoectoderm of blastocysts and maintain ability to self-renewal and differentiation. TSC is a good model to research placenta development in vitro. It will contribute to understanding and improving cloned placentomegaly to compare the transcription and methylation between cloned and natural fertilized embryos throughout TSC derivation process. In the present study, we used SCNT (NT) and SCNT with HDACi treatment (SNT) as cloned groups and natural fertilized (NF) embryos to derive TSCs and chosed 5-time points to peform RNA-seq and RRBS. We found only NT got a barriar in TSC maintenace and both cloned groups exhited abnormal accumulating DNA methylation and it might be resiponsible for some malformations of cloned placentas.
Project description:Trophoblast stem cells (TSCs) are derived from the trophoectoderm of blastocysts and maintain ability to self-renewal and differentiation. TSC is a good model to research placenta development in vitro. It will contribute to understanding and improving cloned placentomegaly to compare the transcription and methylation between cloned and natural fertilized embryos throughout TSC derivation process. In the present study, we used SCNT (NT) and SCNT with HDACi treatment (SNT) as cloned groups and natural fertilized (NF) embryos to derive TSCs and chosed 5-time points to peform RNA-seq and RRBS. We found only NT got a barriar in TSC maintenace and both cloned groups exhited abnormal accumulating DNA methylation and it might be resiponsible for some malformations of cloned placentas.
Project description:This trial was undertaken to examine the perhipheral cellular and antibody response of cattle following infestation with the cattle tick, Rhipicephalus microplus. The information from the Affymetrix gene expression data is used to complement other measurements of immune function such as cellular subset composition and antibody response in cattle of high (Brahman) and low (Holstein-Friesian) resistance to the cattle tick. Keywords: Disease state analysis
Project description:De novo copy number variations in cloned dogs from the same nuclear donor In this study, we aimed to identify de novo post-cloning CNV events and estimated the rate of CNV mosaicism in cloned dogs with the identical genetic background.
Project description:Oligonucleotide DNA microarrays were used as a platform to compare C. jejuni isolates from feedlot cattle and human clinical cases from Alberta. Comparative genomic hybridization (CGH) analysis was performed on 87 isolates (46 bovine, 41 human) obtained within the same geographical regions and time frame. In addition, We also performed gene association analysis to determine if any genes may be differentially distributed between human and cattle sources or between clusters dominated by either human or cattle isolates (âhuman enrichedâ vs âcattle enrichedâ). Keywords: Comparative Genomic Hybridization; Genomic epidemiology; Gene-association study Data from 119 microarrays is included in the dataset, representing the 89 bacterial strains analyzed (87 field isolates, 2 control laboratory strains). Replicate arrays for 20 of the 87 field isolates were included in the dataset, as well as 5 replicates for each of the 2 laboratory controls. An array representing 1546 ORFs from strain NCTC 11168 was used in CGH experiments. CGH was performed by comparing signal from each Tester field isolate analyzed vs. signal from the Control strain NCTC 11168. Values represent mean of triplicate spots.