Biotech Research and Innovation Centre (BRIC), Centre for Epigenetics, University of Copenhagen, Copenhagen, Denmark.
Mol Cell. 2010 Apr 23;38(2):165-78. doi: 10.1016/j.molcel.2010.03.002. Epub 2010 Mar 25.
X-linked mental retardation (XLMR) is an inherited disorder that mostly affects males and is caused by mutations in genes located on the X chromosome. Here, we show that the XLMR protein PHF8 and a C. elegans homolog F29B9.2 catalyze demethylation of di- and monomethylated lysine 9 of histone H3 (H3K9me2/me1). The PHD domain of PHF8 binds to H3K4me3 and colocalizes with H3K4me3 at transcription initiation sites. Furthermore, PHF8 interacts with another XMLR protein, ZNF711, which binds to a subset of PHF8 target genes, including the XLMR gene JARID1C. Of interest, the C. elegans PHF8 homolog is highly expressed in neurons, and mutant animals show impaired locomotion. Taken together, our results functionally link the XLMR gene PHF8 to two other XLMR genes, ZNF711 and JARID1C, indicating that MR genes may be functionally linked in pathways, causing the complex phenotypes observed in patients developing MR.
X 连锁智力障碍 (XLMR) 是一种遗传性疾病,主要影响男性,由位于 X 染色体上的基因突变引起。在这里,我们表明 XLMR 蛋白 PHF8 和秀丽隐杆线虫的同源物 F29B9.2 催化组蛋白 H3 的二甲基和单甲基赖氨酸 9 的去甲基化 (H3K9me2/me1)。PHF8 的 PHD 结构域结合 H3K4me3,并与转录起始位点的 H3K4me3 共定位。此外,PHF8 与另一个 XMLR 蛋白 ZNF711 相互作用,ZNF711 结合到 PHF8 的一组靶基因上,包括 XLMR 基因 JARID1C。有趣的是,秀丽隐杆线虫 PHF8 同源物在神经元中高度表达,突变动物表现出运动障碍。总之,我们的研究结果将 XLMR 基因 PHF8 与另外两个 XLMR 基因 ZNF711 和 JARID1C 联系起来,表明 MR 基因可能在通路中具有功能联系,导致患者出现复杂的智力障碍表型。
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