Overview
- Science Advances published the study Wednesday, reporting that a small set of non-coding DNA regions called HAQERs tracks most closely with differences in language ability.
- These regions cover about a tenth of a percent of the genome yet explain roughly 188–200 times more variation in language than other sites, and they act like gene volume knobs that interact with FOXP2.
- The team linked whole-genome data from 350 Iowa schoolchildren to repeated language tests, then saw similar signals in large external cohorts including UK Biobank and SPARK.
- Comparisons with ancient DNA indicate these language-linked variants arose before modern humans split from Neanderthals and appear at least as common in Neanderthals, implying biological capacity rather than proof of speech identical to ours.
- The authors argue the variants stabilized through a trade-off where boosting fetal brain growth raised childbirth risk, and they plan family-based studies to separate direct genetic effects from parental influences often called genetic nurture.