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Multiple evolutionarily conserved enhancers control expression of Eya1
Author(s) -
Ishihara Tadashi,
Sato Shigeru,
Ikeda Keiko,
Yajima Hiroshi,
Kawakami Kiyoshi
Publication year - 2008
Publication title -
developmental dynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.634
H-Index - 141
eISSN - 1097-0177
pISSN - 1058-8388
DOI - 10.1002/dvdy.21716
Subject(s) - enhancer , biology , otic vesicle , genetics , neural crest , microbiology and biotechnology , neural tube , locus (genetics) , enhancer trap , embryo , gene , transcription factor , gene expression , in situ hybridization
Eya1 is a homolog of eyes absent in Drosophila , and essential for various organ formations in vertebrates. Mouse and chick Eya1 shows dynamic expression pattern in early development. We identified ten independent Eya1 enhancers by screening evolutionarily conserved sequences. They exhibited enhancer activities in Hensen's node, neural tube, migrating neural crest cells, otic vesicle, olfactory placode, cranial ganglia, and somites at HH6–17 of chick embryo. The sum of the enhancer activities of the enhancers covers the endogenous expression domains of Eya1 common to chick and mouse. Enhancer activities were also observed in species‐specific expression domains such as trigeminal ganglia and brain. Mutational study of one of the enhancers revealed that the enhancer is composed of positive and negative cis‐regulatory elements. Thus, we successfully identified a comprehensive group of enhancers around Eya1 locus, which are probably involved in the control of the complex expression pattern of Eya1 in vivo. Developmental Dynamics 237:3142–3156, 2008. © 2008 Wiley‐Liss, Inc.