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Development, Vol 127, Issue 24 5309-5318, Copyright © 2000 by Company of Biologists

JOURNAL ARTICLES

Apterous mediates development of direct flight muscles autonomously and indirect flight muscles through epidermal cues

A Ghazi, S Anant and K VijayRaghavan
National Centre for Biological Sciences, TIFR, Bangalore 560065, India.

Two physiologically distinct types of muscles, the direct and indirect flight muscles, develop from myoblasts associated with the Drosophila wing disc. We show that the direct flight muscles are specified by the expression of Apterous, a Lim homeodomain protein, in groups of myoblasts. This suggests a mechanism of cell-fate specification by labelling groups of fusion competent myoblasts, in contrast to mechanisms in the embryo, where muscle cell fate is specified by single founder myoblasts. In addition, Apterous is expressed in the developing adult epidermal muscle attachment sites. Here, it functions to regulate the expression of stripe, a gene that is an important element of early patterning of muscle fibres, from the epidermis. Our results, which may have broad implications, suggest novel mechanisms of muscle patterning in the adult, in contrast to embryonic myogenesis.
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