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| Status |
Public on Dec 11, 2018 |
| Title |
DNA methylation profiling of Daphnia species. |
| Organisms |
Daphnia pulex; Daphnia magna |
| Experiment type |
Methylation profiling by high throughput sequencing
Expression profiling by high throughput sequencing
|
| Summary |
To profile the Daphnia species methylome and to achieve a better understanding of the level of variations in the methylome of Daphnia species, we performed whole genome bisulfite sequencing (WGBSeq) of adult Daphnia magna Bham2 strain and Daphnia pulex Eloise Butler strain (EB45 and EB31 strains). We also analysed the correlation between gene expression and methylation in the two species, using data generated in this study and RNA-seq data from Orsini, et al. 2016. We found that methylation percentage across the genome of Daphnia spp. follows a bimodal distribution. Furthermore, CpG methylation in Daphnia predominantly occurs at coding regions. Although methylation levels significantly decrease towards the 3’ end of a gene with a significant drop in methylation levels from one exon to the neighbouring intron, there is a clear spike in relative methylation levels between exon and intron boundaries, which may be linked to regulation of splicing. We further demonstrate that DNA methylation in Daphnia is responsive to intrinsic and extrinsic factors.
We also compared the methylation and gene expression correlations found in Daphnia to publicly available dataset from two other invertebrate species (Apis mellifera and Nasonia vitripennis) and two vertebrate species (Homo sapiens and Mus musculus). We observed that similar to other invertebrates, Daphnia’s genome is sparsely methylated at a lower level and the methylation is predominantly focused at gene body while in vertebrate species the genome is heavily methylated (global methylation). Although the level and distribution of methylation across CpG sites is different between vertebrates and invertebrates it is possible that methylation density at coding regions has the same function between vertebrates and invertebrates. We demonstrate evolutionary conservation of a positive correlation between high methylation density at coding regions and gene expression across vertebrates and invertebrates, leading to potentially ensuring continuous high expression of genes required throughout the life in both vertebrates and invertebrates.
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| Overall design |
Examination of DNA methylation in two different species of Daphnia (Daphnia magna bham2 and Daphnia pulex EB strains)
Correlation analysis between levels of gene expression and DNA methylation (Daphnia pulex EB45).
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| |
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| Contributor(s) |
Kvist J, Gonçalves Athanásio C, Mirbahai L |
| Citation(s) |
30060190 |
| |
| Submission date |
Sep 18, 2017 |
| Last update date |
Jul 25, 2021 |
| Contact name |
Jouni Antero Kvist |
| Organization name |
University of Helsinki
|
| Department |
Research Program for Molecular Neurology
|
| Lab |
Medical Neurogenetics group
|
| Street address |
Haartmaninkatu 8
|
| City |
Helsinki |
| State/province |
Uusimaa |
| ZIP/Postal code |
00014 |
| Country |
Finland |
| |
|
| Platforms (3) |
| GPL23821 |
Illumina HiSeq 2500 (Daphnia magna) |
| GPL24021 |
Illumina NextSeq 500 (Daphnia pulex) |
| GPL24022 |
Illumina NextSeq 500 (Daphnia magna) |
|
| Samples (41)
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|
| Relations |
| BioProject |
PRJNA407732 |
| SRA |
SRP117884 |
| Supplementary file |
Size |
Download |
File type/resource |
| GSE103939_GSF1035-F.expression.txt.gz |
368.6 Kb |
(ftp)(http) |
TXT |
| GSE103939_RAW.tar |
1.4 Gb |
(http)(custom) |
TAR (of TXT) |
| GSE103939_cpg.var.bham2.v2.vcf.gz |
8.8 Mb |
(ftp)(http) |
VCF |
| GSE103939_cpg.var.pulex.v2.vcf.gz |
19.3 Mb |
(ftp)(http) |
VCF |
| GSE103939_daphnia.magna.bham2.txt.gz |
39.1 Mb |
(ftp)(http) |
TXT |
| GSE103939_daphnia.pulex.eb31.eb45.txt.gz |
38.1 Mb |
(ftp)(http) |
TXT |
| GSE103939_expression_Bham2_Xinb3.txt.gz |
1.6 Mb |
(ftp)(http) |
TXT |
| GSE103939_magna_snp_cgvIN.vcf.gz |
81.6 Mb |
(ftp)(http) |
VCF |
| GSE103939_pulex_snp_cgvIN.vcf.gz |
180.5 Mb |
(ftp)(http) |
VCF |
SRA Run Selector |
| Raw data are available in SRA |
| Processed data provided as supplementary file |
| Processed data are available on Series record |
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