Is there any virus that contains both DNA and RNA in its genome? It is known that viruses contain DNA or RNA- either one and not both. I came across a question: Which virus contains both DNA and RNA?

Here is the results summary of the study that describes the discovery of DNA:RNA hybrid virus:

> Results Bioinformatic analysis of viral metagenomic sequences derived from a hot, acidic lake revealed a circular, putatively single-stranded DNA virus encoding a major capsid protein similar to those found only in single-stranded RNA viruses. The presence and circular configuration of the complete virus genome was confirmed by inverse PCR amplification from native DNA extracted from lake sediment. The virus genome appears to be the result of a RNA-DNA recombination event between two ostensibly unrelated virus groups. Environmental sequence databases were examined for homologous genes arranged in similar configurations and three similar putative virus genomes from marine environments were identified. This result indicates the existence of a widespread but previously undetected group of viruses.

And here is the link to the paper:

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