The anterior tergite is deleted and replaced by a mirror-image duplication of the intersegmental membrane (ISM), posterior hairy zone (PHZ) and posterior tergite.
Causes the duplication of posterior structures anteriorly in each abdominal segment.
The anterior region of the abdominal tergites is missing in heterozygous adults, and is replaced by a mirror-image duplication of the posterior region of the tergite and intertergal region. Internally, the oenocytes underlying the posterior region of the tergite are also duplicated and the insertion points of the adult muscles reflect the symmetrical epidermal pattern.
Mirror-image duplication of tergite structure. Microchaetae are eliminated from the anterior portion of the tergite and replaced by a duplication consisting of an anteriorly oriented row of macrochaetae and the darkly pigmented cuticle normally found in the posterior portion of the tergite. Fat body and oenocytes underneath the tergite are also duplicated with mirror-image symmetry (Madhavan and Madhavan). Dominant and revertable by X ray mutagenesis suggesting that this allele constitutes a gain-of-function mutation.
The phenotypes in the tergite and PHZ are suppressed by biomb-282; in biomb-282 ; hhMir double mutants, both the normal and mirror-image duplicated PHZ and posterior tergite structures are missing and replaced with a mirror-image double anterior pattern similar to biomb-282 single mutants. However, all segments show double anterior patterning in the double mutants, whereas mirror-image duplications are only seen in a fraction of the segments in biomb-282 single mutants. biomb-282 does not suppress the formation of ectopic ISM seen in hhMir/+ flies.
Fails to complement the recessive lethality of hh mutant alleles.
Muskavitch.
Null alleles of bi are epistatic to hhMir.
Ectopic hh expression in the anterior compartment. Three reversions of hhMir have breaks at the hh locus and behave as hh nulls or hypomorphs.