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Dev Biol 2006 Mar 15;2912:398-412. doi: 10.1016/j.ydbio.2005.12.029.
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Nucleosome regulator Xhmgb3 is required for cell proliferation of the eye and brain as a downstream target of Xenopus rax/Rx1.

Terada K , Kitayama A , Kanamoto T , Ueno N , Furukawa T .

Rax/Rx is a paired-type homeodomain-containing transcription factor that is essential for cell proliferation in the developing eye and brain. The molecular mechanisms that regulate cell proliferation by rax, however, are largely unknown. Here, we identify the high mobility group B3 gene (hmgb3) as a downstream target of Xenopus rax (Xrax/XRx1). Overexpression of Xhmgb3 results in an increase in eye and brain sizes due to promoted cell proliferation, while morpholino-oligo-mediated knock down of Xhmgb3 reduces eye and brain sizes. In addition, ChIP assays showed that Xhmgb3 is recruited around the promoter region of c-myc to enhance c-myc transcription. We also found that XOptx2 requires rax for its initial expression. Furthermore, we show that Xhmgb3 and XOptx2 are required for retinal development mainly at different developmental stages. Our findings reveal a novel aspect of progenitor cell proliferation during embryonic central nervous system (CNS) development.

PubMed ID: 16445903
Article link: Dev Biol

Species referenced: Xenopus laevis
Genes referenced: en2 gal.2 hmgb3 myc mycn pax6 prkra rax six3 six6 smad10
Morpholinos: hmgb3 MO1 rax MO1 rax MO2

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