Frontier Questions
7 frontier questions in mTOR biology — not gaps in the Atlas's corpus, but questions about how the pathway is being measured: whether activity is read as a level when it behaves as a pattern, whether its outputs separate, whether location decides substrate choice, and which human ageing phenotypes are actually reachable.
Does mTORC1 carry information in the pattern of its activity over time, not its average level?
Much of the mTOR literature measures activity the way you would read a thermometer once: one number, from one moment, often right after the cell was given a sudden jolt of nutrients. That approach has taught us a lot, bu…
How can the same mTORC1 activity produce different outputs — and which of them carries ageing?
The same amount of mTORC1 activity does not have to give the same result. Each of the enzyme's targets has its own sensitivity: some stay switched on when mTORC1 is only partly blocked, others switch off first (Kang 2013…
Is mTOR signalling decided by where the complex is active, rather than by how much of it is active?
The lysosome is normally described as mTOR's parking space. There are reasons to think it is more like a workbench, where what the enzyme can reach depends on where and how it is docked. One of its targets, TFEB, is only…
Does the timing of mTOR inhibition have to match the body's own pulses — feeding, exercise, sleep?
Giving the drug once a week instead of daily is usually explained as a way to lower the dose and avoid side effects. But if the pathway cares about rhythm, the question is not how often you give it — it is whether the ga…
Which human ageing phenotypes are causally reversible by mTOR modulation — and is it the same mechanism in each tissue?
Asking whether a drug makes people live longer cannot be answered in any reasonable amount of time, and aiming at it has crowded out better questions. Ageing is not one thing: the immune system, muscle, metabolism and th…
Can different combinations of inputs give the same average mTORC1 activity but a different time course — and a different outcome?
mTOR listens to several things at once: food (amino acids), hormones like insulin, the cell's energy level, and stress. Experiments usually change one of these at a time and read the answer once. But two different mixes …
Does how long mTOR is inhibited decide which complex is inhibited — and how are mTORC1 and mTORC2 coupled in time?
Rapamycin is called an mTORC1 drug, and at first it is. Given for longer, it also starts to take apart the second complex, mTORC2, in many cell types, and in mice that is linked to the drug's effect on blood sugar. So ho…
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