5) Early Drosophila III

5) Early Drosophila III - 9/6/10 Developmental Biology BIOL...

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9/6/10 1 Developmental Biology BIOL 3090-001 Lecture 5) Development of the Drosophila Body Plan III Lecture Outline DV patterning: Dpp Gap genes and how they are controlled Pair-rule genes Segmentation genes: engrailed Compartments and their boundaries – Wingless and Hedgehog signaling Homeotic selector genes
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9/6/10 2 Segmentation Genes Activated in response to the pair-rule genes Expressed in 14 transverse stripes Example is engrailed Engrailed Delimits the Anterior Parasegment Boundary Expressed throughout the life of the fly Delimits a cell-lineage boundary Defines a compartment
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9/6/10 3 Compartments In the Wing Compartments visualized in genetic mosaic animals Compartment boundary in wing is straight and doesn’t follow any structural features No compartment boundary in engrailed mutant Segmentation Genes Affect segmentation patterns visualized on the larval cuticle Normal patterning depends on the stabilization of segment boundaries wg and hh mutants have denticles completely covering abdomen
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This note was uploaded on 09/18/2011 for the course BIOL 3090 taught by Professor Steven during the Spring '10 term at Toledo.

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5) Early Drosophila III - 9/6/10 Developmental Biology BIOL...

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