PuSH - Publication Server of Helmholtz Zentrum München: Identification of <em>Cis</em>-regulatory elements in the mouse <em>Pax9/Nkx2-9</em> genomic region: Implication for evolutionary conserved synteny.

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Santagati, F. ; Abe, K.* ; Schmidt, V.* ; Schmitt-John, T.* ; Suzuki, M.* ; Yamamura, K.* ; Imai, K.

Identification of Cis-regulatory elements in the mouse Pax9/Nkx2-9 genomic region: Implication for evolutionary conserved synteny.

Genetics 165, 235-242 (2003)

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We previously reported close physical linkage between Pax9 and Nkx2-9 in the human, mouse, and pufferfish (Fugu rubripes) genomes. In this study, we analyzed cis-regulatory elements of the two genes by comparative sequencing in the three species and by transgenesis in the mouse. We identified two regions including conserved noncoding sequences that possessed specific enhancer activities for expression of Pax9 in the medial nasal process and of Nkx2-9 in the ventral neural tube. Remarkably, the latter contained the consensus Gli-binding motif. Interestingly, the identified Pax9 cis-regulatory sequences were located in an intron of the neighboring gene Slc25a21. Close examination of an extended genomic interval around Pax9 revealed the presence of strong synteny conservation in the human, mouse, and Fugu genomes. We propose such an intersecting organization of cis-regulatory sequences in multigenic regions as a possible mechanism that maintains evolutionary conserved synteny.

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