A Possible Mechanism of DNA to DNA Transcription in Eukaryotic Cells : Endonuclease Dependent Transcript Cutout

TL;DR

This paper proposes a novel mechanism for DNA to DNA transcription in eukaryotic cells involving endonuclease-dependent transcript cutout, where ssDNA fragments are produced and released from the genome.

Contribution

It introduces the concept of endonuclease-dependent transcript cutout as a new mechanism for DNA to DNA transcription in eukaryotic cells.

Findings

Proposes a new DNA to DNA transcription mechanism involving endonuclease activity.

Suggests ssDNA fragments are produced and released via nicking and repair cycles.

Highlights potential for multiple ssDNA transcript copies through repeated cycles.

Abstract

We previously proposed the existence of DNA to DNA transcription in eukaryotic cells, but the mechanism by which single-stranded DNA (ssDNA) transcript is produced and released from the genome remains unknown. We once speculated that the mechanism of DNA to DNA transcription might be similar to that of DNA to RNA transcription, but now we propose that endonuclease dependent transcript cutout may be a possible mechanism of DNA to DNA transcription, in which a copy of ssDNA fragment (transcript) between two nicks produced by nicking endonuclease is released from double-stranded DNA (dsDNA) region in the genome by an unknown ssDNA fragment releasing enzyme. The gap in the dsDNA will be filled through DNA repair mechanism. Occasionally, multiple copies of ssDNA transcripts could be produced through multiple rounds of cutout-repair-cutout cycle.