Two distinct mechanisms for long-range patterning by Decapentaplegic in the Drosophila wing

Article Abstract:

The localized expression of Drosophila Decapentaplegic (Dpp) protein specifies the long-range patterning along the anterior-posterior (A/P) axis of the wing by two different mechanisms. In one mechanism, patterning depends on the local concentration of Dpp. The patterning also depends on the ability of cells to retain the signals that their progenitors got when they were present near Dpp secreting cells. The spalt and optomotor-blind genes mediate Dpp activity and successive A/P axis formation in the early embryo.

Cell interaction, Cell interactions, Embryology, Animal embryology

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Specification of the wing by localized expression of wingless protein

Article Abstract:

The activity of the Drosophila patterning system of anteroposterior subdivision of wing disc affects specification of the wing primordium in early second instar. The dorsoventral (DV) patterning system has no affect. The wingless gene (wg) has an important role in specifying the wing primordium. The gene controls the patterning activities of the DV compartment boundary. The DV system activates the wg and Vestigial proteins, and both the proteins are essential for the wing growth.

Proteins, Mutation (Biology), Mutation, Wings (Animal), Animal wings

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Signal transduction by cAMP-dependent protein kinase A in Drosophila limb patterning

Article Abstract:

Examination of the developing limbs of Drosophila reveals that loss of gene encoding cyclic AMP-dependent protein kinase A is functionally equivalent to loss of patched gene activity or to supplying cells with Hedgehog protein (Hh) signal. Expression of decapentaplegic gene and development of compartment boundary organizer is induced by Hh and patched gene via the cyclic AMP-dependent protein kinase A present in the signal transduction pathway.

Analysis, Genetic aspects, Cellular signal transduction, Protein kinases, Extremities (Anatomy)

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