A frameshift mutation after the first 36 codons, likely a deletion of G108 relative to the ATG start of Six4.
Deletion of a single G residue at position 108 relative to the ATG causes a frameshift after aa36.
Six4108 homozygotes and Six4108/Six4289 transheterozygotes are lethal.
Six4108 homozygous somatic clones fail to form basal stalks, resulting in the presence of fused egg chambers, and clonal follicle stem cells exhibit a significant increase in cell competition capacity, as seen by their increase in clonal expansion as compared to wild-type control clones.