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Transcriptome phylogenies support ancient evolutionary transitions in bioluminescence phenotypes of cypridinid ostracods

ABSTRACT: Transcriptome phylogenies support ancient evolutionary transitions in bioluminescence phenotypes of cypridinid ostracods

PROVIDER: PRJNA723333 | ENA |

REPOSITORIES: ENA

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Project description:Transcriptome phylogenies support ancient evolutionary transitions in bioluminescence traits of cypridinid ostracods

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Variant Polycomb complexes in Drosophila consistent with ancient functional diversity

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Project description:Cytosine methylation of DNA is a widespread modification of DNA that plays numerous critical roles, yet has been lost many times in diverse eukaryotic lineages. In the yeast Cryptococcus neoformans, CG methylation occurs in transposon-rich repeats and requires the DNA methyltransferase, Dnmt5. We show that Dnmt5 displays exquisite maintenance-type specificity in vitro and in vivo and utilizes similar in vivo cofactors as the metazoan maintenance methylase Dnmt1. Remarkably, phylogenetic and functional analysis revealed that the ancestral species lost the gene for a de novo methylase, DnmtX, between 50-150 MYA. We examined how methylation has persisted since the ancient loss of DnmtX. Experimental and comparative studies reveal efficient replication of methylation patterns in C. neoformans, rare stochastic methylation loss and gain events, and the action of natural selection. We propose that an epigenome has been propagated for >50 MY through a process analogous to Darwinian evolution of the genome.

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