This was discovered ten years ago:

Here we report a case showing not only the
integration of a viral segment into the genome of its host
(honeybee) but also the reciprocal integration of a host–genome
segment into a virus-derived sequence. As a result of integration
of a viral sequence into the host genome, a new phenotype has
emerged: individual bees harboring the integrated viral
sequence were found to be virus-resistant.

This paper reports
not only the integration of a DNA version of an RNA segment
from a bee-affecting dicistrovirus into the genome of the
honeybee, but also the reciprocal integration of an RNA version
of a segment of the host DNA into the virus. This indicates
RNA–DNA mobility in both directions in a non-retroviral system.

Bi-directional RNA mobilization may lead to dual co-evolution
of host and virus. Expression of viral sequences from the
host genome is probably an infrequent event prone to
deterioration. However, when expressible, it may lead to the
appearance of a new host phenotype.

Maori, Eyal, Edna Tanne, and Ilan Sela. "Reciprocal sequence exchange between non-retro viruses and hosts leading to the appearance of new host phenotypes." Virology 362.2 (2007): 342-349.

[Comment: I mention this because it created quite a buzz at the time. Where did this discovery lead to?]

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