This a preprint and has not been peer reviewed. Data may be preliminary.

Stuttering is a complex speech disorder and heritability of this trait is persuasive, with multiple afflicted families showing phenotypic segregation across generations, yet no conclusive genetic etiology could be identified. Analyzing multiplex families using exome sequencing(ES) may help in identification of putative genes and scope for understanding the mutational burden for speech implicated pathways. In this study ES was performed in six individuals from two clinically well characterized, multiple affected, south Indian families showing stuttering across five generations. From ES to variant prioritization, a sequential bioinformatics approach was implemented to search for putative gene targets. In the two multiplex families studied, ES data analysis resulted in an enriched list of 14 genes (with variants) (COL4A2,