Mitochondrial supplementation at fertilization enhances early developmental outcome
Ontology highlight
ABSTRACT:
ORGANISM(S): Sus scrofa
SUBMITTER: Justin St. John
PROVIDER: E-GEOD-65310 | biostudies-arrayexpress |
REPOSITORIES: biostudies-arrayexpress
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Project description:Parental dietary conditions can influence the metabolic traits of offspring. In mice, paternal consumption of low protein diet alters cholesterol and lipid metabolism of progeny. Here, we examine RNA species expressed in male reproductive tissues of mice. Protein restriction leads to altered levels of multiple small RNAs in mature sperm, as well as throughout the male reproductive tract, with decreased levels of let-7 family members and increased levels of 5â fragments of tRNA-Gly isoacceptors. Intriguingly, tRNA fragments are scarce in the testis, but their levels increase in sperm during post-testicular maturation in the epididymis. We find that epididymosomes â extracellular vesicles which fuse with sperm during epididymal transit â exhibit RNA payloads closely matching those of mature sperm, and can deliver tRNA fragments to immature sperm in vitro both in mouse and in bull. Finally, we show that tRNA-Gly-GCC fragments play a role in repressing genes associated with the endogenous retroelement MERVL, both in ES cells and in preimplantation embryos. Our results shed light on small RNA biogenesis during post-testicular sperm maturation, and link tRNA fragments to regulation of endogenous retroelements active in the early embryo. Zygotes were generated by ICSI from oocytes/females fed a Control diet and sperm/males fed either a Control or Low Protein diet. The sperm was isolated from either the Rete testis or the Cauda epididymis and injected either as a whole sperm or just the sperm head. Following fertilization by ICSI the zygotes developed for 28 hours (2C stage) and were harvested for single-embryo RNA-Seq.
2015-12-31 | E-GEOD-75769 | biostudies-arrayexpress
Project description:Metabolic stress associated with negative energy balance in high producing dairy cattle and obesity in women is a risk factor for decreased fertility. Non-esterified fatty acids (NEFA) are involved in this pathogenesis as they jeopardize oocyte and embryo development. Growing evidence indicates that maternal metabolic disorders can disturb epigenetic programming, and more specifically DNA methylation, in the offspring. Final oocyte maturation and early embryo development coincide with specific methylation changes and both time periods are sensitive to adverse environments. Therefore, we investigated whether elevated NEFA concentrations affect the establishment and maintenance of DNA methylation patterns in oocytes and embryos and subsequently alter transcriptomic profiles and developmental competence of the resultant blastocysts. To do this, bovine oocytes and embryos were exposed to different NEFA concentrations in two separate experiments. In the first experiment, oocytes were matured in vitro for 24 hours in medium containing: 1) physiological (âBASALâ) concentrations of oleic (OA), palmitic (PA) and stearic (SA) or 2) elevated (pathophysiological or âHIGH COMBIâ) concentrations of OA, PA and SA. In the second experiment, zygotes were cultivated in vitro for 6.5 days under BASAL or HIGH COMBI conditions. The developmental competence was evaluated by assessing cleavage and blastocyst rate. Overall gene expression and DNA methylation of resultant blastocysts were analyzed using microarray techniques. Data regarding DNA methylation were re-evaluated by pyrosequencing. HIGH COMBI-exposed oocytes and embryos displayed a lower competence to develop into blastocysts compared to their BASAL-exposed counterparts (19.3 % compared to 23.2 % and 18.2 % compared to 25.3 %, respectively) (P < 0.05). HIGH COMBI-exposed oocytes and embryos resulted in blastocysts with altered DNA methylation profiles and transcriptomic fingerprints, compared to BASAL-exposed counterparts. Differences in gene expression and methylation were more pronounced after exposure during culture compared to maturation suggesting that zygotes are more susceptible to an adverse environment. Main gene networks affected were related to lipid and carbohydrate metabolism, cell death, immune response and metabolic disorders. This may offer clues regarding the high rate of embryonic loss and metabolic diseases during later stages of life observed in offspring from mothers displaying lipolytic disorders. Two experiments were set up to characterize the epigenomic profile of the resultant day 7.5 blastocysts. In the first (in vitro maturation or IVM) experiment, the effect of elevated NEFA exposure during oocyte maturation (24 h) on DNA methylation profiles was evaluated by exposing oocytes to the BASAL or HIGH COMBI conditions. In the second (in vitro culture or IVC) experiment, the effect of elevated NEFA exposure during embryo culture (6.5 days) on DNA methylation marks was evaluated by exposing embryos to the BASAL or HIGH COMBI conditions. A total of 1039 and 1412 oocytes were used in the IVM and IVC experiment, respectively, equally distributed between treatments in 4 replicates. Resultant day 7.5 blastocysts were snap frozen for subsequent DNA methylation analysis (80 blastocysts in each experiments, equally collected between treatments in 4 replicates).
2016-06-28 | E-GEOD-83766 | biostudies-arrayexpress
Project description:Sperm are highly differentiated and the activities that reprogram them for embryonic development during fertilization have historically been considered unique to the oocyte. We here challenge this view and demonstrate that mouse embryos in the mitotic cell cycle can also directly reprogram sperm for full term development. Developmentally incompetent haploid embryos (parthenogenotes) injected with sperm developed to produce healthy offspring at up to 24% of control rates, depending when in the embryonic cell cycle injection took place. This implies that most of the first embryonic cell cycle can be bypassed in sperm genome reprogramming for full development. Remodeling of histones and genomic 5'- methylcytosine and 5'-hydroxymethylcytosine following embryo injection were distinct from remodeling in fertilization and the resulting 2-cell embryos consistently possessed abnormal transcriptomes. These studies demonstrate plasticity in the reprogramming of terminally differentiated sperm nuclei and suggest that different epigenetic pathways or kinetics can establish totipotency. phICSI vs ICSI
2016-07-22 | E-GEOD-60595 | biostudies-arrayexpress
Project description:Microarray analysis of transcriptome bovine blastocysts Day 8, deriving from oocytes matured under different insulin concentrations as model for metabolic imbalance Three conditions experiment: control, Low Insulin, High Insulin treatments. Biological replicates: 4 for each treatment. One replicate per array.
2014-10-31 | E-GEOD-62881 | biostudies-arrayexpress
Project description:Treatment of oocytes derived from large (4-6 mm; LG) or small (>3 mm; SM) follicles with glial cell line-derived neurotrophic factor (GDNF) during in vitro maturation. Four-condition experiment, SM and LG oocytes, each with and without GDNF. Biological replicates: 9 per condition, independently collected. Pools of three replicates per array.
2012-11-09 | E-GEOD-42198 | biostudies-arrayexpress
Project description:Objective: To develop a reliable, reproducible, and sensitive method for investigating gene-expression profiles from individual human oocytes. Setting: University medical center and university microarray laboratory. Patient(s): Couples undergoing intracytoplasmic sperm injection treatment were asked to donate their immature oocytes for research, and written informed consent was obtained in all cases. Seventy-nine human oocytes were used in total. Intervention(s): None. Main Outcome Measure(s): Amplification efficiency and microarray profiles. Result(s): Two of the five protocols (WT-Ovation One-Direct and Arcturus RiboAMp HS Plus) resulted in sufficient yields and high success rates and were further validated for their performance in obtaining reliable, reproducible, and sensitive expression profiles from individual human oocytes. Evaluation of these two protocols demonstrated that they both displayed low technical variation and produced highly reproducible profiles (r R 0.95). One of them identified significantly more transcripts but also had a higher number of false discoveries. Conclusion(s): Two protocols generated ample amounts of mRNA for (quantitative) polymerase chain reaction, microarray, and sequencing techniques. Further validation using a design that discriminates between biological and technical variation showed that both protocols can be used for gene-expression profiling of individual human oocytes. Design: Five commercially available protocols were investigated for their efficiency to amplify messenger RNA (mRNA) from 54 single human oocytes. Protocols resulting in sufficient yields were further validated using microarray technology. For the validation, mRNA was isolated from 25 human oocytes. To eliminate biological variation, RNA from 13 human oocytes was pooled together and split into 12 identical samples for further mRNA amplification. From 12 oocytes, mRNA was individually isolated.
2015-12-31 | E-GEOD-48141 | biostudies-arrayexpress
Project description:Metabolic stress associated with negative energy balance in high producing dairy cattle and obesity in women is a risk factor for decreased fertility. Non-esterified fatty acids (NEFA) are involved in this pathogenesis as they jeopardize oocyte and embryo development. Growing evidence indicates that maternal metabolic disorders can disturb epigenetic programming, and more specifically DNA methylation, in the offspring. Final oocyte maturation and early embryo development coincide with specific methylation changes and both time periods are sensitive to adverse environments. Therefore, we investigated whether elevated NEFA concentrations affect the establishment and maintenance of DNA methylation patterns in oocytes and embryos and subsequently alter transcriptomic profiles and developmental competence of the resultant blastocysts. To do this, bovine oocytes and embryos were exposed to different NEFA concentrations in two separate experiments. In the first experiment, oocytes were matured in vitro for 24 hours in medium containing: 1) physiological (âBASALâ) concentrations of oleic (OA), palmitic (PA) and stearic (SA) or 2) elevated (pathophysiological or âHIGH COMBIâ) concentrations of OA, PA and SA. In the second experiment, zygotes were cultivated in vitro for 6.5 days under BASAL or HIGH COMBI conditions. The developmental competence was evaluated by assessing cleavage and blastocyst rate. Overall gene expression and DNA methylation of resultant blastocysts were analyzed using microarray techniques. Data regarding DNA methylation were re-evaluated by pyrosequencing. HIGH COMBI-exposed oocytes and embryos displayed a lower competence to develop into blastocysts compared to their BASAL-exposed counterparts (19.3 % compared to 23.2 % and 18.2 % compared to 25.3 %, respectively) (P < 0.05). HIGH COMBI-exposed oocytes and embryos resulted in blastocysts with altered DNA methylation profiles and transcriptomic fingerprints, compared to BASAL-exposed counterparts. Differences in gene expression and methylation were more pronounced after exposure during culture compared to maturation suggesting that zygotes are more susceptible to an adverse environment. Main gene networks affected were related to lipid and carbohydrate metabolism, cell death, immune response and metabolic disorders. This may offer clues regarding the high rate of embryonic loss and metabolic diseases during later stages of life observed in offspring from mothers displaying lipolytic disorders. The effect of elevated NEFA exposure during embryo culture (6.5 days) on gene expression was evaluated by exposing embryos to the BASAL or HIGH COMBI conditions. A total of 1412 oocytes were used, equally distributed between treatments in 4 replicates. Resultant day 7.5 blastocysts were snap frozen for subsequent transcriptome analysis (80 blastocysts in each experiments, equally collected between treatments in 4 replicates).
2016-06-28 | E-GEOD-83767 | biostudies-arrayexpress
Project description:Competent oocytes can be discriminated by BCB staining. Positive stained oocytes are considered more competent than BCB negative oocyte, and injection of BCB+ oocyte extracted mitochondria into BCB negative oocytse can increase fertilisation and blastocyst rate. Here we have analysed the impact of mitochondrial supplementation on subsequent blastocyst transcriptome using agilent one color microarray that is specificly design to study the porcine embryo preimplantation period. Blastocysts were produced by intra cytoplasmic sperm injection (ICSI) from BCB positive and BCB negative oocytes as well as BCB negative oocytes supplemented with mitochondrial extract during ICSI (mICSI), and 3-4 single blatocyst transcriptomes were analysed for each group.
2016-09-01 | GSE65310 | GEO
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2016-08-25 | E-GEOD-50193 | biostudies-arrayexpress
Project description:Clinicians need additional metrics for predicting quality of human oocytes for IVF procedures. Human polar bodies reflect the oocyte transcript profile. Quantitation of polar body mRNAs could allow for both oocyte ranking and embryo preferences in IVF applications. The transcriptome of a polar body has never been reported, in any organism. Eight total samples. There are 2 biological replicates of the following four conditions: pooled oocytes and their sister polar bodies and a single oocyte and its sister polar body.
2011-10-12 | E-GEOD-32689 | biostudies-arrayexpress