| Content Provider | Springer Nature : BioMed Central |
|---|---|
| Author | Gómez-Redondo, Isabel Planells, Benjamín Cánovas, Sebastián Ivanova, Elena Kelsey, Gavin Gutiérrez-Adán, Alfonso |
| Abstract | Background Prior work in mice has shown that some retrotransposed elements remain substantially methylated during DNA methylation reprogramming of germ cells. In the pig, however, information about this process is scarce. The present study was designed to examine the methylation profiles of porcine germ cells during the time course of epigenetic reprogramming. Results Sows were artificially inseminated, and their fetuses were collected 28, 32, 36, 39, and 42 days later. At each time point, genital ridges were dissected from the mesonephros and germ cells were isolated through magnetic-activated cell sorting using an anti-SSEA-1 antibody, and recovered germ cells were subjected to whole-genome bisulphite sequencing. Methylation levels were quantified using SeqMonk software by performing an unbiased analysis, and persistently methylated regions (PMRs) in each sex were determined to extract those regions showing 50% or more methylation. Most genomic elements underwent a dramatic loss of methylation from day 28 to day 36, when the lowest levels were shown. By day 42, there was evidence for the initiation of genomic re-methylation. We identified a total of 1456 and 1122 PMRs in male and female germ cells, respectively, and large numbers of transposable elements (SINEs, LINEs, and LTRs) were found to be located within these PMRs. Twenty-one percent of the introns located in these PMRs were found to be the first introns of a gene, suggesting their regulatory role in the expression of these genes. Interestingly, most of the identified PMRs were demethylated at the blastocyst stage. Conclusions Our findings indicate that methylation reprogramming in pig germ cells follows the general dynamics shown in mice and human, unveiling genomic elements that behave differently between male and female germ cells. |
| Related Links | https://clinicalepigeneticsjournal.biomedcentral.com/counter/pdf/10.1186/s13148-021-01003-x.pdf |
| Ending Page | 13 |
| Page Count | 13 |
| Starting Page | 1 |
| File Format | HTM / HTML |
| ISSN | 18687083 |
| DOI | 10.1186/s13148-021-01003-x |
| Journal | Clinical Epigenetics |
| Issue Number | 1 |
| Volume Number | 13 |
| Language | English |
| Publisher | BioMed Central |
| Publisher Date | 2021-02-03 |
| Access Restriction | Open |
| Subject Keyword | Human Genetics Gene Function Embryo Primordial germ cells Methylation reprogramming Whole-genome bisulphite sequencing |
| Content Type | Text |
| Resource Type | Article |
| Subject | Molecular Biology Genetics (clinical) Developmental Biology Genetics |
| Journal Impact Factor | 4.8/2023 |
| 5-Year Journal Impact Factor | 5.8/2023 |
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