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Dev Growth Differ 2004 Aug 01;464:335-41. doi: 10.1111/j.1440-169x.2004.00750.x.
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A new G-stretch-DNA-binding protein, Unichrom, displays cell-cycle-dependent expression in sea urchin embryos.

Moritani K , Tagashira H , Shimotori T , Sakamoto N , Tanaka S , Takata K , Mitsunaga-Nakatsubo K , Bojiiwa Y , Yamamoto T , Shimada H , Akasaka K .

We report the identification and characterization of Unichrom, a gene encoding a new G-stretch-DNA-binding protein in the sea urchin embryo. The derived amino acid sequence of Unichrom contains plant homeodomain (PHD) finger and high mobility group (HMG) motifs as well as motifs required for cell-cycle-dependent degradation. The expression of a Unichrom-green fluorescent protein (GFP) fusion protein in sea urchin embryonic cells indicates that Unichrom protein accumulates in nuclei during interphase and disperses into the cytoplasm at mitosis. Overexpression of dominant negative Unichrom, which contains the DNA binding domain lacking the motif for cell-cycle-dependent degradation, causes impairment of chromosome segregation. These results suggest that Unichrom binds to genome DNA at G-stretch and that degradation of Unichrom is required for segregation of chromosomes.

PubMed ID: 15367201
Article link: Dev Growth Differ

Genes referenced: LOC100887844 LOC115918087 LOC115919910