UASt regulatory sequences drive expression of a cDNA encoding the Chchd2-PA isoform, mutated to carry a S81L amino acid replacement (this change is equivalent to a S59L change in the human CHCHD10 gene, a pathogenic variant associated with frontotemporal lobar degeneration and amyotrophic lateral sclerosis). The coding sequence is tagged at the C-terminal end with Tag:V5.