Feschotte said this virally transmitted DNA may be a cause of mutation and psychiatric disorders such as schizophrenia and mood disorders. Feschotte wrote on recent research led by Professor Keizo Tomonaga at Osaka University in Japan. The research showed that the genomes of humans and other mammals contain DNA derived from the insertion of bornaviruses, RNA viruses whose replication and transcription takes place in the nucleus. The study, and an accompanying News & Views article by University of Texas at Arlington biology professor Cédric Feschotte, is published in the journal Nature.