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Dach1, a vertebrate homologue of Drosophila dachshund, is expressed in the developing eye and ear of both chick and mouse and is regulated independently of Pax and Eya genes.

Abstract：

:We have cloned a chick homologue of Drosophila dachshund (dac), termed Dach1. Dach1 is the orthologue of mouse and human Dac/Dach (hereafter referred to as Dach1). We show that chick Dach1 is expressed in a variety of sites during embryonic development, including the eye and ear. Previous work has demonstrated the existence of a functional network and genetic regulatory hierarchy in Drosophila in which eyeless (ey, the Pax6 orthologue), eyes absent (eya), and dac operate together to regulate Drosophila eye development, and that ey regulates the expression of eya and dac. We find that in the developing eye of both chick and mouse, expression domains of Dach1 overlap with those of Pax6, a gene required for normal eye development. Similarly, in the developing ear of both mouse and chick, Dach1 expression overlaps with the expression of another Pax gene, Pax2. In the mouse, Dach1 expression in the developing ear also overlaps with the expression of Eya1 (an eya homologue). Both Pax2 and Eya1 are required for normal ear development. Our expression studies suggest that the Drosophila Pax-eya-dac regulatory network may be evolutionarily conserved such that Pax genes, Eya1, and Dach1 may function together in vertebrates to regulate neural development. To address the further possibility that a regulatory hierarchy exists between Pax, Eya, and Dach genes, we have examined the expression of mouse Dach1 in Pax6, Pax2 and Eya1 mutant backgrounds. Our results indicate that Pax6, Pax2, and Eya1 do not regulate Dach1 expression through a simple linear hierarchy.

journal_name

Mech Dev

journal_title

Mechanisms of development

authors

Heanue TA,Davis RJ,Rowitch DH,Kispert A,McMahon AP,Mardon G,Tabin CJ

doi

10.1016/s0925-4773(01)00611-6

subject

Has Abstract

pub_date

2002-02-01 00:00:00

pages

75-87

issue

1-2

eissn

0925-4773

issn

1872-6356

pii

S0925477301006116

journal_volume

111

pub_type

杂志文章

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