Language’s Strength Is Driven by Its Genetic Underpinnings

What makes us unique throughout the animal kingdom? The ability to read, write, and talk is what sets humans apart from other animals; it allows us to convey a wide variety of ideas and feelings to others. Our understanding of the molecular mechanisms that underpin such skills is, however, far from complete. Research on identical twins has shown that a wide range of heritability in linguistic abilities, including reading and writing, from 30 to 80 percent.

Five reading and language-related qualities are intimately connected at the genetic level, according to new study that analyzed fundamental assessments of reading and language in addition to genetic data from thousands of individuals. Proceedings of the National Academy of Sciences has published the results (PNAS). Additionally, the results of this research differed from those of prior, smaller investigations, indicating that the candidate genes reported in those papers may be erroneous.

Volunteers that worked on this project spoke a variety of languages, including but not limited to English, Finnish, French, German, Hungarian, and Spanish. Basic abilities were tested, such as the test taker’s ability to read both genuine and fabricated words, such as “horse” and “chove.” Other tests were uttering a word with a missing letter, such as “halt” without the “s,” or saying a spoonerism, in which a normal sentence is altered to sound more like “dice no” instead of “good day.” Participants’ ability to remember and recite difficult nonwords like “loddernapish” was evaluated, along with their ability to articulate and understand spoken language.

To identify genetic variations associated with alterations in linguistic aptitude, a genome-wide association research was conducted. DOCK7, ATG4C, ANGPTL3, and USP1 are only few of the genes on chromosome 1 that have been associated to word reading abilities. This research uncovered a few common genetic variations that have previously been associated to both verbal and nonverbal intelligence.

This study also discovered that there are heritable variations in the neuronal architecture of the left superior temporal sulcus. The ability to spell, read, and recognize phonemes all seem to depend on the development of this area, which has a strong connection to both spoken and written language. Reading and language skills were shown to be influenced by prenatal brain development and by genetic variations, the research found.

Else Eising, a researcher at the Max Planck Institute for Psycholinguistics (MPI) in Nijmegen and the study’s primary author, said, “If we can reveal the biological roots of abilities involved in speaking and reading, we may learn more about how language originated in our species.” Even in nations where the majority of individuals obtain the same high-quality education in regards to reading and language, “we can better understand why there are individual disparities in these abilities.”

The Max Planck Institute and the Proceedings of the National Academy of Sciences