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The Central Dogma of molecular biology is that DNA makes RNA, and RNA makes protein. This doesn't explicitly state that there's a 1:1 dependency between these t
by mjg59 3y ago
The Central Dogma of molecular biology is that DNA makes RNA, and RNA makes protein. This doesn't explicitly state that there's a 1:1 dependency between these things, but it kind of implies it. This paper describes a discovery that in Octopuses, sufficiently low temperatures trigger modification of the RNA before it's used as a template for protein production. The paper identifies cases where this results in modification to a protein involved in microtubule transport and a protein involved in ion transport in synapses, both plausible scenarios where you may want different properties in different thermodynamic situations.
This is both very neat and very irritating! It's a lovely result where there's apparent demonstration of a complex mechanism producing an intuitive result, but it's also another case where just having the DNA sequence doesn't tell you what's actually happening in the cell. Biology is complicated.
- pfisherman 3y agoThe central dogma is kind of like a spherical cow in biology. It is a very rough approximation that is simple enough and correct enough for non-biosci college freshman to work with and learn something from.
- contrarian1234 3y agowhat...? It's not some simplification to make toy problems for freshman. It's literally be always correct till they just discovered this thing From what I understand it's the first case of "Temperature-dependent RNA editing" ever observed
- joshuahedlund 3y ago> till they just discovered this thing There’s introns, alternate splicings… lots of very common exceptions/complications to the central dogma that I never knew about until I started learning more than high school biology. This is discovery of a new form of post-transcription modification, but it’s not the first.
- pfisherman 3y agoLol! What makes a lung epithelial cell different from an alveolar cell? They both carry a copy of the entire genome. How do cells transduce mechanical, chemical, and environmental signals / stresses to alter gene expression?
- contrarian1234 3y agogene expression/inhibition doesn't require gene editing
- pfisherman 3y agoI am not sure what you are getting at. Epigenetic modification of the genome (methylation, acylation, TAD formation, etc) is not gene editing, but it is most certainly modification of the genome.
- echelon 3y agoSomatic recombination. Transposons. Barr bodies. It gets even wilder when you start looking at other animals and kingdoms of life.
- visarga 3y agoI am not a biologist, but from what I understand the gene regulatory network is like a neural network, so it could encode arbitrary behaviour as selected by evolution. Maybe someone who knows what they are talking about could chime in.
- VeninVidiaVicii 3y agoIt was rhetorical. The answer is immaterial, just that the question presented a clear deviation from the dogma.
- melagonster 3y agothis is more like a question of development biology. gene regulation play important role during development of cell. so the common question is what decide the fate of cells? and this is difficult. the normal explanation in textbook: when embryo develop, cell grow up to specific type by many different way(surely gene regulation), and in the whole life of individual cell just mitosis.
- kjkjadksj 3y agoRna is still encoding for protein though and dna is still encoding for rna which then gets processed. Plenty of rna is spliced after transcription in many species.
- vikramkr 3y agoMy take is that it's not a simplification - it's just incomplete. Presenting it as the only way things work is just incorrect and an unnecessary lie to teach students. But it is one way things work and a pretty important one at that. We've known about a myriad other interactions between dna, rna, and protein for a while though
- CatWChainsaw 3y ago...Are you unaware that HIV works, and has always worked, by using reverse transcriptase, which inputs RNA and outputs DNA? It may be a simplification in that it's the default, but it is not "literally always correct".
- VeninVidiaVicii 3y agoExactly, the reason it’s called a “dogma” is semi-sarcasm, just like “big bang”.
- JumpCrisscross 3y ago> Central Dogma of molecular biology is that DNA makes RNA, and RNA makes protein mRNA in most animal cells, sure. RNA’s direct role in gene expression, RNAi, RNA that modified other RNA, et cetera have been known about for a while.