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Deletion of the core-H region in mice abolishes the expression of three proximal odorant receptor genes in cis.

Proc Natl Acad Sci U S A. 2007 Dec 11;104(50):20067-72. Epub 2007 Dec 05
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摘要


We have previously reported that a 2.1-kb homology (H) sequence, conserved between mouse and human, regulates the odorant receptor (OR) gene MOR28 in transgenic mice. Here, we narrowed down the essential sequences of the H to a core of 124 bp by using a transient expression system in zebrafish embryos. Transgenic experiments in mice demonstrated that the core-H sequence is sufficient to endow expression of the MOR28 minigene. Deletion and mutation analyses of the core-H region revealed two homeodomain sequences to be essential for the H enhancer activity. Targeted deletion of the core-H abolished expression of three proximal OR genes, MOR28, MOR10, and MOR83, in cis, indicating the presence of another locus control region/enhancer in the downstream region, that regulates four distal OR genes in the same MOR28 cluster. In the heterozygous mice, the H(-) phenotype of the mutant allele was not rescued by the wild-type H(+) allele in trans.

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