theSIGNAL SCIENCE
13 June 2026
"Language is the house of being; its foundations may be older than we ever dared to think."
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Science

Tiny DNA Slivers May Explain Why Humans Alone Talk

A University of Iowa study finds that less than 0.1% of human DNA drives an outsized share of our language ability — and it predates our split from Neanderthals.

Picture a volume knob. Not a gene, not a chromosome — just a tiny dial buried inside your DNA, quietly deciding how loudly certain genes speak. A new study from University of Iowa Health Care suggests that a scattering of these dials, collectively smaller than a footnote in the genome, may be responsible for one of the most remarkable things humans do: talk to each other. The regions in question are called Human Ancestor Quickly Evolved Regions, or HAQERs.

They are not genes themselves. Rather, they are regulatory sequences — stretches of DNA that control how other genes behave. What makes them startling is their scale. HAQERs make up less than a tenth of a percent of the entire human genome, yet researchers found they drive roughly 200 times more impact on language ability than any other genomic region.

Jacob Michaelson, Roy J.

Photo: National Cancer Institute / Unsplash
A researcher examines genetic sequence data linked to human language development in a laboratory setting.
Discuss
  • Why might it surprise scientists that language-related DNA regions evolved before Neanderthals and humans split?
  • Jacob Michaelson compares DNA regions to a 'volume knob' — how effective is this metaphor, and can you think of a better one?
  • Should long-term studies like Tomblin's, which store children's DNA for decades, require ongoing consent from participants?
  • How might the discovery that HAQERs predate modern humans change the way we think about Neanderthal communication?
  • If language ability is partly genetic, does that make it more or less impressive as a human achievement?
Science

Poverty leaves marks inside your DNA

Sixty-six thousand people. One hundred and forty studies. One unsettling conclusion: poverty and discrimination appear to fast-forward your body's biological clock — and the evidence is written directly into your DNA. Researchers at Berlin's Max Planck Institute, working with Columbia University, ran a sweeping meta-analysis published in *Nature Human Behaviour*. …
  • Can the biological effects of poverty ever be fully reversed?
∞
What we are seeing is how a very small part of the genome can have an outsized influence, not just on who we were as a species, but on who we are as individuals.
Jacob Michaelson, Roy J. Carver Professor of Psychiatry and Neuroscience, University of Iowa
Science

A One-Time Shot That Resets Lupus

Katie Tinkler lived with lupus for over thirty years. Then, in an NHS trial at University College London, doctors took her own white blood cells, genetically rewired them, and sent them back in. Within months, her symptoms had vanished — and she danced at her daughter's wedding. The technique is called CAR T-cell therapy. …
  • Should experimental therapies like CAR-T be fast-tracked for autoimmune diseases worldwide?
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theSIGNAL IN THE LAB
1VOCABULARY
regulatory sequencesdiverged
meta-analysisepigenetic clocksaccelerated aging
remissionmisfiring
2GRAMMAR FOCUS
Inversion with negative adverbials
When sentences begin with negative or restrictive adverbials such as 'Not only', 'Hardly', 'Never', or 'Seldom', the subject and auxiliary verb are inverted, as in a question structure. This creates emphasis and is common in formal or academic writing.
did · had · were · Never · Not only · Hardly · have
  1. Not only HAQERs make up less than a tenth of a percent of the genome, but they also drive roughly 200 times more impact on language ability than any other region.
  2. Hardly Bruce Tomblin preserved the saliva samples in the 1990s when he imagined they would one day reshape the story of human language.
  3. Not only the children in the Iowa study unaware of their contribution, but their DNA eventually helped scientists push the origins of language further back in time.
  4. before had researchers considered that the biological roots of language might predate the split between modern humans and Neanderthals.
  5. did the CAR T-cell therapy eliminate Katie Tinkler's symptoms, but it also freed her from the need for lifelong medication.
  6. had the infusion been completed when several of the severely ill patients began moving towards remission.
  7. Not only epigenetic aging affect adults living in poverty — children in poorer households already displayed its effects at an early age.
3PHRASAL VERBS
Match the phrasal verb (1–6) to its correct definition (A–F). All six appear in today's articles.
  1. 1. run on top (of)
  2. 2. push back
  3. 3. fast-forward
  4. 4. send back (in)
  5. 5. fast-track
  6. 6. hang in the air
4CRITICAL THINKING
All three articles describe discoveries that challenge previously held assumptions — about when language evolved, whether poverty's damage is permanent, and what CAR-T therapy can treat. Choose one of these overturned assumptions and explain why it matters beyond the laboratory: what social, ethical, or philosophical consequences follow if the new picture is correct?
5CREATIVE · HEADLINES
Write a headline for the top story (HAQERs and the origins of language) in each of the following styles. One line each, no explanation:
  • TABLOID NEWSPAPER
  • LUXURY MAGAZINE
  • ACTIVIST BLOG
6WRITING
Bruce Tomblin collected DNA from schoolchildren in the 1990s, not knowing how it would eventually be used — and those children never knew either. Write a short letter from one of those now-adult participants to the researchers, expressing their reaction on learning their saliva sample helped rewrite the history of human language.
7DEGREES OF EXTREMITY
Complete each ladder from mild to strong.
  • unusual→→
  • affected→→
  • influenced→→
  • unwell→→
  • cautious→→
  • noticeable→→
  • improved→→
8SPEAKING
  1. Who should fund long-term genetic research — governments or private companies?
  2. Is it ethical to use cancer treatments for autoimmune diseases?
  3. Could epigenetic aging markers ever be used against people legally?
  4. What responsibilities do scientists have when results challenge historical beliefs?
  5. Should DNA collected decades ago be destroyed once research concludes?