UASt regulatory sequences drive expression of a mir-9a "sponge" sequence, which consists of ten repetitive mir-9a complementary sequences with mismatches at positions 9-12 separated by a variable four-nucleotide linker. The sponge sequence is inserted into 3'UTR sequence downstream of the EGFP coding region, to enhance stability.
Expression of Avic\GFPEGFP.Scer\UAS-mir-9aSP under the control of the ubiquitous Scer\GAL4αTub84B.PL driver results in posterior wing margin defects.
Expression of mir-9asponge.Scer\UAS.T:Avic\GFP-EGFP under the control of the ubiquitous Scer\GAL4αTub84B.PL driver results in posterior wing margin defects. This phenotype is enhanced in a mir-9aJ22/+ background.
A mir-9aJ22/+ background enhances the wing margin defects seen when Avic\GFPEGFP.Scer\UAS-mir-9aSP is expressed under the control of Scer\GAL4αTub84B.PL.
Expression of Avic\GFPEGFP.Scer\UAS-mir-9aSP along the dorsal-ventral boundary of the wing disc using Scer\GAL4vg.PM fails to rescue the wing margin phenotype seen in mir-9aJ22 homozygous mutants.