Manolis Kellis — Professor at MIT and head of the MIT Computational Biology Group. He studies the human genome through computational, evolutionary, and cross-disciplinary lenses, with prolific work on gene regulation and evolutionary signatures.
The gist
Lex Fridman talks with MIT professor Manolis Kellis about what makes the human genome beautiful: its digital, fault-tolerant code, the interplay of vertical (genetic) and horizontal (cultural) inheritance, and how natural variation across 7 billion people makes humans the best-studied organism. Kellis explains evolution as blind mutation plus ruthless selection, applies his evolutionary-signatures method to decode the SARS-CoV-2 genome, and argues messiness and breaking things are features, not bugs, in both biology and engineering. They range across free will, the placebo effect, immune diversity, brain-computer interfaces, the ambiguity of language, and translation. The conversation closes on Kellis's '42nd birthday' meaning-of-life symposium and his reflections on parenting and gratitude.
Big reveals
- Kellis's evolutionary-signatures analysis found ORF10, a hypothesized SARS-CoV-2 gene, is bogus: 'that's not a protein at all... it's an rna structure.'
- He discovered a hidden gene-within-a-gene inside ORF3a, meaning we don't even know all of SARS-CoV-2's building blocks.
- Genetics has made humans the most-studied species, overtaking model organisms: 'it's actually simpler to figure out the phenotype... by mining human data.'
- Contrarian take: kids raised 'eating dirt' build stronger immune systems than those in 'super clean environments' with tons of allergies.
- Diet and exercise, not pills, are the best way to boost every aspect of health including Alzheimer's, cancer, and COVID resilience.
- You have more non-human cells than human cells: 'you're basically a giant bag of bacteria with a few human cells.'
- Profound engineering lesson: 'if engineers had designed evolution we would still be perfectly replicating bacteria' because breaking things enables new optima.
- His linguist friend's answer to the meaning of life: 'become one' interpreted three ways.
Things worth remembering
- We change in height more during a day than any single height-related genetic variant contributes; you wake up taller than the evening.
- Any two people are 99.9% identical, yet any two siblings differ in millions of locations.
- The genome uses content-based indexing via short ~8-character regulatory motifs, not go-to addresses like computer code.
- Flip 20% of a hard drive's bits and you're in trouble; flip 20% of the genome's letters and you probably won't notice.
- SARS-CoV-2 hijacks human ribosomes from a single RNA to make ~30 proteins, while human cells make only one protein per RNA.
- An obesity allele (FTO locus) rose from 2% frequency in Africa to ~44% in Europe as fat-storing was selected for during ice ages.
- The D614G spike mutation jumped from ~1% to ~90% frequency, disrupting a position perfectly conserved across millions of years.
- Baker's yeast (Saccharomyces cerevisiae) descends from a whole-genome duplication coinciding with the emergence of fruit-bearing plants.
- To feel how we control bodies indirectly: when you breathe you think of your lungs, but you're actually just moving your diaphragm.
- Kellis throws numerology-themed birthdays, celebrating his '100000 binary' (32nd) and a meaning-of-life symposium at 42.