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Manipulation of endogenous regulatory elements and transgenic analyses of the Tbx1 gene

Content Provider	Springer Nature Link
Author	Zhang, Zhen Baldini, Antonio
Copyright Year	2010
Abstract	Pharyngeal morphogenesis is a complex process involving precise coordination of multiple cell types and transcription networks. TBX1 heterozygous mutation causes DiGeorge Syndrome, a typical disorder of pharyngeal development. In mice, loss of function of Tbx1 causes severe disruption of pharyngeal development. Therefore, to understand the regulatory circuits controlling the pharyngeal apparatus, it is important to understand how Tbx1 is regulated. Transgenic experiments had shown that a Forkhead (Fox) transcription factor binding site is required for the activity of a Tbx1 enhancer driving expression in many of the endogenous domains. In this study we carried out manipulation of regulatory elements of the endogenous gene in mice and extensive transgenic analysis of the Tbx1 locus. Results indicated that the Fox binding site is dispensable for Tbx1 gene expression, but the enhancer within which it is located regulates, to a limited extent, mesodermal expression of the gene. Transgenic analysis of conserved noncoding regions within 54 kb of the Tbx1 locus identified a novel pharyngeal endoderm-specific enhancer and an intronic suppressor element. Overall, our data suggest a regulatory architecture of the Tbx1 gene made of tissue-specific modules and redundant elements that individually contribute, to a modest extent, to the expression of the gene.
Starting Page	556
Ending Page	564
Page Count	9
File Format	PDF
ISSN	09388990
Journal	Mammalian Genome
Volume Number	21
Issue Number	11-12
e-ISSN	14321777
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-11-25
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Zoology Anatomy Cell Biology
Content Type	Text
Resource Type	Article
Subject	Genetics

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