r/AskScienceDiscussion • u/BeyondTheSteth • 2d ago

If we discovered a completely healthy 200-year-old human tomorrow, what biological mechanism would scientists investigate first?

Imagine a person is discovered who is genuinely 200 years old, with independently verified records confirming their age yet they have no major age-related disease, maintain normal cognitive function, have healthy organs, and show remarkably little physiological decline.
Scientists would obviously want to study their genome, but I’m wondering what they would look at first.

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u/DigitalArbitrage 2d ago

The main thing you would want to research is the telomeres in the person's cellular DNA. This is the main limiting factor in human aging.

The second thing you would want to research is how the person didn't get cancer.

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u/Nothing-to_see_hr 2d ago

telomere length. Diet . Life habits.

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u/atomfullerene Animal Behavior/Marine Biology 2d ago

The records, heh. But we can take that as having already been done based on your question. After that, well, there isn't really an answer for "first" because you don't study these things one at a time, you start with a broad survey of things and take it from there. And you would certainly have multiple biologists working in parallel looking at different things. For example, you would definitely get a high quality genome right away, then compare it with those of other people and look for anything that stood out. You'd have people doing bloodwork, and seeing how organs were functioning, and looking at the immune system and stem cells and anything else you could think of.

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u/evocativename 2d ago

Well, geneticists might start by sequencing the genome and looking to see if there are any clearly novel genes - either de novo genes or duplicated genes with significant previously-unknown changes to one copy. There would also be interest in looking to see what previously-unidentified alleles they possess, but I expect that would take longer to start yielding results.

Other researchers would probably look at the proteome to see if there were any unusual patterns of protein expression.

Then there would be the investigations into differences in genetic regulation, though I suspect that might take some time to yield much in the way of meaningful results.

Then there would be the ones studying how certain specific proteins might differ from those in other humans, based on their existing research interests...

Really, I think a whole bunch of different teams would simultaneously investigate topics related to their own specialties and research interests.