A frameshift allele that truncates the majority of the coding potential of the gene.
A 1 bp deletion in the Spn77Bc coding region leads to a frameshift. There is also a two base substitution (TT/GA) just upstream of the deletion.
Spn77BcSK4 mutant adults do not show any overt morphological defects. However, adult males carrying the Spn77BcSK4 allele over a cognate deficiency as well as Spn77BcSK4 homozygotes do not display any decrease in male fecundity, despite the significant increase in the frequency of spermatid individualization defects and high proportion of abnormal individualization complexes, the deposition of mature sperm to the seminal vesicles is also compromised.
