Deletion of most (206 bp) of the second exon of Hyls1 coupled with an insertion an extra 10-bp nucleotides, leading to a predicted reading frame shift. Only the first 38 amino acids of the very N-terminus are predicted to be translated followed shortly by a de novo stop codon. chif lies in the intron between exon 1 and exon 2 of Hyls1 and Hyls156 deletes the 30-aa C-terminus specific to chif-RA. This lesion in chif is designated chif56. The chif-RB and chif-RD isoforms are unaffected by this lesion and, because these isoforms are fully functional, the chif56 mutant should not affect chif function.
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In Hyls156 homozygous scolopidium one of the axonemes is missing.
Hyls156 homozygous larvae exhibit reduced touch sensitivity while Hyls156 homozygous adults exhibit abnormal locomotor behavior (climbing defect) and abnormal chemosensitive behavior (defects in attraction to grape juice).
Hyls156 homozygous spermatocytes exhibit shorter centrioles. Hyls156 homozygous spermatids exhibit a decrease in their number, loss of bundled organization, loss of atypical centrioles and incomplete and broken axonemal.
Embryos fathered by Hyls156 homozygotes exhibit developmental delay and arrest at the early cleavage stage.
Hyls156 is rescued by Hyls1Ub.GFP
Hyls156 is partially rescued by Scer\GAL4elav-C155/Hyls1UAS.GFP