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Brain Metabolic DNA: A Long Story and Some Conclusions

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Abstract

We have previously outlined the main properties of brain metabolic DNA (BMD) and its involvement in circadian oscillations, learning, and post-trial sleep. The presence of BMD in certain subcellular fractions and their behavior in cesium gradients have suggested that BMD originates from cytoplasmic reverse transcription and subsequently acquires a double-stranded configuration. More recently, it has been reported that some DNA sequences of cytoplasmic BMD in learning mice are different from that of the control animals. Furthermore, BMD is located in vicinity of the genes involved in different modifications of synaptic activity, suggesting that BMD may contribute to the brain’s response to the changing environment. The present review outlines recent data with a special emphasis on reverse transcription of BMD that may recapitulate the molecular events at the time of the “RNA world” by activating mitochondrial telomerase and generating RNA templates from mitochondrial transcripts. The latter unexpected role of mitochondria is likely to promote a better understanding of mitochondrial contribution to cellular interactions and eukaryotic evolution. An initial step regards the role of human mitochondria in embryonic BMD synthesis, which is exclusively of maternal origin. In addition, mitochondrial transcripts involved in reverse transcription of BMD might possibly reveal unexpected features elucidating mitochondrial involvement in cancer events and neurodegenerative disorders.

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Acknowledgements

We thank Prof. Marianna Crispino, University of Naples Federico II, and Dr. Chun Jong Tai, Stazione Zoologica Anton Dohrn, Naples, for their helpful collaboration and comments to our manuscript.

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  1. Accademia Di Scienze Fisiche E Matematiche, Via Mezzocannone 8, 80134, Napoli, Italy

    Antonio Giuditta

  2. Dept Neuroscience, University of Verona, Strada Le Grazie 8, 37129, Verona, Italy

    Gigliola Grassi Zucconi

  3. Dept Experimental Medicine, Medical School, University Campania “L. Vanvitelli”, Via S. Andrea delle Dame 7, 80138, Naples, Italy

    Adolfo Sadile

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Giuditta, A., Zucconi, G.G. & Sadile, A. Brain Metabolic DNA: A Long Story and Some Conclusions. Mol Neurobiol 60, 228–234 (2023). https://doi.org/10.1007/s12035-022-03030-y

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