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Genome-wide sequencing and comparative profiling of cattle sperm DNA methylome

ABSTRACT: Genome-wide sequencing and comparative profiling of cattle sperm DNA methylome

PROVIDER: PRJNA417285 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR6261520_1.fastq.gz	Fastqsanger.gz
	SRR6261520_2.fastq.gz	Fastqsanger.gz
	SRR6261530_1.fastq.gz	Fastqsanger.gz
	SRR6261530_2.fastq.gz	Fastqsanger.gz
	SRR6261540_1.fastq.gz	Fastqsanger.gz

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Genome-wide sequencing and comparative profiling of cattle sperm DNA methylome

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Project description:5-methylcytosine is a major epigenetic modification sometimes called "the fifth nucleotide". However, our knowledge of how offspring inherit the DNA methylome from parents is limited. We generated nine single-base resolution DNA methylomes including zebrafish gametes and early embryos. The oocyte methylome is significantly hypo-methylated compared to sperm. Strikingly, the paternal DNA methylation pattern is maintained throughout early embryogenesis. The maternal DNA methylation pattern is maintained until the 16-cell stage. Then, the oocyte methylome is gradually discarded through cell division, and progressively reprogrammed to a pattern similar to that of the sperm methylome. The passive demethylation rate and the de novo methylation rate are similar in the maternal DNA. By the midblastula stage, the embryo?s methylome is virtually identical to the sperm methylome. Moreover, inheritance of the sperm methylome facilitates the epigenetic regulation of embryogenesis. Therefore, besides DNA sequences, sperm DNA methylome is also inherited in zebrafish early embryos. hMeDIP-seq is performed in sperm,2-cell,16-cell,1k-cell and a input control sample 4 new samples are added to GSE44075. RNA-seq is performed in sperm, egg,1k-cell, germring samples .hMeDIP-seq is performed in sperm,2-cell,16-cell,1k-cell and a input control sample 10 new samples are added to GSE44075. Bisulfite-seq is performed for nine samples : sperm, egg,16-cell,32-cell,64-cell,128-cell,1k-cell , Germring and testis. TAB-seq is performed for one sample , 32-cell.

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Project description:Using whole-genome bisulfite sequencing (WGBS), we profiled 18 DNA methylomes of cattle sperms that were collected from 18 representative age-matched Holstein bulls with high reliable phenotypes on many complex traits, including sire-conception rate (SCR), gestation length (GL), sire calving ease (SCE), cow conception rate (CCR) and body depth (BDE). Through comparison with human sperm methylome, we observed that genomic regions with differetial DNA methylation levels were enriched for GWAS signals and had important evolutionary impact. By comparing animals with extreme SCR, we showed that differentially methylated regions (DMR) associated with SCR and aging were significantly and selectively enriched for GWAS signals of male fertility traits in cattle. In addition, we detected ans compared DMRs assocaited with GL, CCR, SCE and BDE. We integrated GWAS signals of 37 complex traits with DMRs associated with GL to provide insights into genetic basis of GL.

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Project description:Aim: To characterize the sperm methylome in semen samples from 19 donors with proven fertility. Material and Methods: Bisulfite-converted sperm DNA was hybridized on the HumanMethylation450 Infinium BeadChip platform. CpG fluorescence-intensities were extracted and converted to β-values. Results: The sperm methylome is highly homogeneous and hypomethylated. Genes with hypomethylated promoters are ontologically associated to biological functions related to spermatogenesis and embryogenesis. Sex-chromosomes are the most hypomethylated chromosomes, supporting data that indicated their essential role in spermatogenesis. Ninety-four genes are resistant to demethylation, being strong candidates for transgenerational inheritance. Conclusion: Spermatozoa carry a homogeneous methylation profile that is a footprint of past events (spermatogenesis), is designed to facilitate future events (embryogenesis), and has a possible influence in the adult life (transgenerational effects).

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