Deletion of base pairs 145 and 146 in the first coding exon leads to a frame shift and stop signal 12 codons downstream, resulting in a mutant protein 59 aa long (rather than the wild-type 735 aa).
barrE831 homozygous and barrE831/barrL305 transheterozygous embryos show variable muscle pattern defects, which may include: misshaped and disoriented muscles, missing muscles and/or "holes" in the muscle pattern; distorted pharynx musculature; heart cells are occasionally missing or duplicated. These musculature defects are not observed in barrE831/Df(2L)Exel7077 transheterozygotes that also express barrUASp.cOa.EGFP under the control of Scer\GAL4da.PU.
barrE831 homozygous embryos also show a disturbed central nervous system, as compared to controls.