Genes connected to proficiency in language?

Along tonal (where pitch communicates meaning, as in Chinese) lines. Of 26 linguistic features studied ("such as whether consonants aggregate at the beginnings and ends of words") among 49 populations, only tonality was found to correlate with two alleles (variants of genes) being studied for microcephaly.
So possibly having the appropriate allele allows for easier processing of a tonal or non-tonal language.