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| Status |
Public on Oct 26, 2020 |
| Title |
Evolution of CpH methylation in vertebrate brains |
| Organisms |
Apis mellifera; Branchiostoma lanceolatum; Callorhinchus milii; Danio rerio; Gallus gallus; Ornithorhynchus anatinus; Monodelphis domestica; Octopus bimaculoides; Lethenteron camtschaticum |
| Experiment type |
Expression profiling by high throughput sequencing
Methylation profiling by high throughput sequencing
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| Summary |
The brain requires complex mechanisms of genome regulation to encode and store behavioural information. In mammals, DNA methylation deposited at non-CG dinucleotides characterises brain epigenomes. However, it is unclear to what extent this non-canonical form of DNA methylation is evolutionarily conserved. To test this we profile brain cytosine methylation across the major vertebrate lineages, amphioxus, honeybee and octopus, finding that non-CG methylation in adult brain methylomes is restricted to vertebrates. In vertebrates, the genomic patterns of non-CG do not recapitulate those of CG methylation, yet both patterns are deeply conserved. Whereas low levels of gene body CG methylation demarcate a set of developmental transcription factors across tissues and species, a distinct set of neurodevelopmental genes accumulate non-CG methylation in neural tissues. We further show that the establishment of this methylation context coincides with the origin of the “writer” of non-CG methylation, the methyltransferase DNMT3A, and the “reader”, the methyl-CpG binding protein 2 (MeCP2), fuelled by the ancestral whole genome duplication in vertebrates. Surprisingly, MeCP2 evolved in a stepwise process, from an ancestral MBD4 protein with a dual role in transcriptional regulation and DNA repair in chordates. In sum, we show how a novel neural epigenomic layer assembled at the root of vertebrates and gained new regulatory roles partly independent from CG methylation, which could have fostered the sophisticated cognitive repertoires found in the vertebrate lineage.
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| Overall design |
Profiling of cytosine methylation for brain samples from Monodelphis domestica, Ornithorhynchus anatinus, Gallus gallus, Callorhinchus milii, Lethenteron camtschaticum, Apis mellifera, Octopus bimaculoides, and Branchiostoma lanceolatum.
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| Contributor(s) |
de Mendoza A, Poppe D, Buckberry S, Pflueger J, Bogdanovic O, Lister R |
| Citation(s) |
33462491 |
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| Submission date |
Dec 06, 2019 |
| Last update date |
Sep 04, 2023 |
| Contact name |
Ryan Lister |
| E-mail(s) |
ryanlister@gmail.com
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| Phone |
61864884407
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| Organization name |
The University of Western Australia
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| Street address |
35 Stirling Highway
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| City |
Perth |
| State/province |
WA |
| ZIP/Postal code |
6009 |
| Country |
Australia |
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| Platforms (9)
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| GPL13725 |
Illumina Genome Analyzer IIx (Apis mellifera) |
| GPL18171 |
Illumina HiSeq 1500 (Danio rerio) |
| GPL21476 |
Illumina HiSeq 1500 (Gallus gallus) |
| GPL27874 |
Illumina HiSeq 1500 (Monodelphis domestica) |
| GPL27875 |
Illumina HiSeq 1500 (Ornithorhynchus anatinus) |
| GPL27876 |
Illumina HiSeq 1500 (Callorhinchus milii) |
| GPL27877 |
Illumina HiSeq 1500 (Lethenteron camtschaticum) |
| GPL27878 |
Illumina HiSeq 1500 (Octopus bimaculoides) |
| GPL27879 |
Illumina NovaSeq 6000 (Branchiostoma lanceolatum) |
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| Samples (11)
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| Relations |
| BioProject |
PRJNA594208 |
| SRA |
SRP235124 |
| Supplementary file |
Size |
Download |
File type/resource |
| GSE141609_RAW.tar |
18.5 Gb |
(http)(custom) |
TAR (of CGMAP, TSV) |
SRA Run Selector |
| Raw data are available in SRA |
| Processed data provided as supplementary file |
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