KDM1B是一种基因组H3K4脱甲基酶,需要建立母体基因组印记
David N Ciccone1, Hui Su, Sarah Hevi
1Epigenetics Program, Novartis Institutes for Biomedical Research, 250 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA.
Nature
|September 4, 2009
概括
氨酸脱甲基酶1B (KDM1B) 对于在卵细胞发育过程中在印记的基因上建立DNA甲基化印记至关重要. 它的缺失导致异常的基因表达和小鼠的胚胎致死性.
科学领域:
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 基因组学就是基因组学.
- 发育生物学 发展生物学
背景情况:
- 基因组印记通过差异性DNA甲基化来调节父母起源的特定基因表达.
- 在新基因DNA甲基转移酶DNMT3A和DNMT3L中,对于在游戏生成过程中建立这些甲基化印记至关重要.
- 针对 de novo 甲基化机制在生殖线中的特定印记位置的精确机制尚不清楚.
研究的目的:
- 调查氨基氧化酶 (含有黄素) 域1 (AOF1) 的作用,重新命名为氨酸脱甲基酶1B (KDM1B),在胚胎DNA甲基化和基因组印记中.
- 确定KDM1B作为卵细胞中的基因素H3氨酸4 (H3K4) 脱甲基酶的功能.
主要方法:
- 基因向破坏小鼠中的KDM1B基因.
- 从KDM1B缺乏的雌性卵细胞中分析H3K4甲基化水平.
- 评估DNA甲基化印记和基因表达在卵细胞和由此产生的胚胎中的印记位置.
主要成果:
- 在生长中的卵细胞中KDM1B的表达很高,这与印记的建立相吻合.
- 缺少KDM1B导致H3K4甲基化增加,并且无法在几个印制基因上建立DNA甲基化标记.
- 来自KDM1B缺陷卵细胞的胚胎表现出双基因表达/抑制,并在妊娠中期之前死亡.
结论:
- 基因组H3K4通过KDM1B去甲基化对于在 oogenesis 期间正确建立 DNA 甲基化印记至关重要.
- KDM1B在调节胚胎发育所必需的印记基因表达方面发挥着至关重要的作用.
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