Pattern formation and differentiation center in the eye disc of Drosophila

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The ommatidial pattern formation and differentiation center during the development of the Drosophila compound eye is described using combined autoradiography and transplantation methods. The mitotic waves for photoreceptor formation produced from the posterior to the anterior of the eye disc during the third instar larvae. However, in the eye discs which removed the posterior edge does not occured such a mitotic waves. The fragments of the third instar eye discs implanted into adult abdomens with ecdysteroid, moulting hormone will differentiate to adult structures. Anterior or posterior fragments from the third instar discs were formed ommatidial structures. By contrast, the fragments from the early third instar discs, ommatidial formation were observed only posterior ones. However, dorsal and ventral half of the fragments in the early third instar discs were formed the ommatidium. These findings strongly suggest that the differentiation center exists at the two parts, that is dorsal and ventral part of the posterior region in the 60 hours eye disc and proceed from posterior to anterior region.
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