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Fig. 9. Model for hunchback depletion in Oncopeltus fasciatus.
Increasingly stronger hunchback knockdown results in two distinct
effects. The first aspect of the depletion phenotype is transformation of the
labial and anterior thoracic segments towards abdominal identity. In stronger
depletion animals, this region of transformation expands, eventually
encompassing the entire thorax. The second aspect of the hunchback
phenotype is posterior compaction. Weak hb depletion results in mild
compaction of the abdomen. In moderate and strong phenotypic classes, the
abdomen is significantly shortened, with associated defects in segmentation.
Therefore in the most severe cases (class V), these two aspects together
result in a phenotype where the head is followed by an indeterminate number of
segments, all with abdominal identity.
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