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dc.contributor.advisorAranda, Manuel
dc.contributor.authorRuiz Santiesteban, Juan Antonio
dc.date.accessioned2018-11-29T07:01:57Z
dc.date.available2019-11-29T00:00:00Z
dc.date.issued2018-11
dc.identifier.citationRuiz Santiesteban, J. A. (2018). DNA Methylation in the Demosponge Amphimedon queenslandica is Involved in Genome Evolution and Transcription. KAUST Research Repository. https://doi.org/10.25781/KAUST-0575H
dc.identifier.doi10.25781/KAUST-0575H
dc.identifier.urihttp://hdl.handle.net/10754/630102
dc.description.abstractDNA methylation is an epigenetic mechanism with roles that range from the fine tuning of transcription to genome wide dynamic acclimation to changing environments and regulation of developmental processes. While recent work has confirmed the presence and regulatory functions of DNA methylation in non-bilaterians, its role and distribution in Porifera has never been addressed. In this study, we performed whole genome bisulfite sequencing of the demosponge Amphimedon queenslandica and show that DNA methylation occurs mostly in CpG dinucleotides of coding regions. While high levels of gene-body methylation correlate positively with high expression and co-occur with the histone modification H3K36me3, they are not associated with amelioration of spurious transcription as found in other metazoans; nonetheless, per-exon methylation levels are predictive for exon retention suggesting a role in mRNA splicing. Additionally, analyses of Amphimedon and other sponges genomic data consistently revealed biased dinucleotide frequencies that suggest a long history of methylation-driven CpG conversion. Despite a genome wide loss of CpG dinucleotides, these are positively selected in exons and in methylated genes. These results indicate DNA methylation as a component of early metazoans regulome and challenge hypothesis on CpG methylation acting as a means for codon usage optimization.
dc.language.isoen
dc.subjectEpigenetics
dc.subjectDNA Methylation
dc.subjectPorifera
dc.subjectEvolution
dc.subjectTranscription
dc.subjectGenomes
dc.titleDNA Methylation in the Demosponge Amphimedon queenslandica is Involved in Genome Evolution and Transcription
dc.typeThesis
dc.contributor.departmentBiological and Environmental Science and Engineering (BESE) Division
dc.rights.embargodate2019-11-29
thesis.degree.grantorKing Abdullah University of Science and Technology
dc.contributor.committeememberVoolstra, Christian R.
dc.contributor.committeememberFischle, Wolfgang
thesis.degree.disciplineBioscience
thesis.degree.nameMaster of Science
dc.rights.accessrightsAt the time of archiving, the student author of this thesis opted to temporarily restrict access to it. The full text of this thesis became available to the public after the expiration of the embargo on 2019-11-29.
refterms.dateFOA2018-11-29T07:02:29Z


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