Molecular cloning of sequences from wingless, a segment polarity gene in Drosophila: the spatial distribution of a transcript in embryos (original) (raw)

EMBO J. 1987 Jun; 6(6): 1765–1773.

Medical Research Council, Laboratory of Molecular Biology, University Medical School, Hills Road, Cambridge CB2 2QH, UK

Present address: Department of Biochemistry, University of California, Berkeley, CA 94720, USA

Abstract

In Drosophila the process of segmentation depends on the function of coordinate, gap, pair-rule and segment-polarity genes. Mutations in segment-polarity genes cause defects in the pattern of every segment. Here the cloning of sequences from a segment-polarity gene, wingless, and the in situ localization of a transcript in embryos are described. The transcript is first detected in the anterior and posterior regions of the blastoderm embryo at cellularization, and accumulates in a series of stripes in the extended germ band, one stripe per metameric unit. Each stripe is localized to the most posterior cells of each parasegment. The signal is predominantly epidermal, and transcript accumulates only transiently in the mesoderm and nervous system. This pattern of expression is discussed with respect to models of pattern formation in segmental units.

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