Detecting regular sound changes in linguistics as events of concerted evolution

Daniel Hruschka, Simon Branford, Eric D. Smith, Jon Wilkins, Andrew Meade, Mark Pagel, Tanmoy Bhattacharya

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

Background Concerted evolution is normally used to describe parallel changes at different sites in a genome, but it is also observed in languages where a specific phoneme changes to the same other phoneme in many words in the lexicon - a phenomenon known as regular sound change. We develop a general statistical model that can detect concerted changes in aligned sequence data and apply it to study regular sound changes in the Turkic language family.

Results Linguistic evolution, unlike the genetic substitutional process, is dominated by events of concerted evolutionary change. Our model identified more than 70 historical events of regular sound change that occurred throughout the evolution of the Turkic language family, while simultaneously inferring a dated phylogenetic tree. Including regular sound changes yielded an approximately 4-fold improvement in the characterization of linguistic change over a simpler model of sporadic change, improved phylogenetic inference, and returned more reliable and plausible dates for events on the phylogenies. The historical timings of the concerted changes closely follow a Poisson process model, and the sound transition networks derived from our model mirror linguistic expectations.

Conclusions We demonstrate that a model with no prior knowledge of complex concerted or regular changes can nevertheless infer the historical timings and genealogical placements of events of concerted change from the signals left in contemporary data. Our model can be applied wherever discrete elements - such as genes, words, cultural trends, technologies, or morphological traits - can change in parallel within an organism or other evolving group.

Original languageEnglish (US)
Pages (from-to)1-9
Number of pages9
JournalCurrent Biology
Volume25
Issue number1
DOIs
StatePublished - Jan 5 2015

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)

Fingerprint

Dive into the research topics of 'Detecting regular sound changes in linguistics as events of concerted evolution'. Together they form a unique fingerprint.

Cite this