在 Beckwith-Wiedemann 综合征中高度可变的基因组甲基化与多位点印记干扰相关
Francesco Cecere1,2, Laura Pignata2, Emilia D'Angelo2
1Institute of Genetics and Biophysics (IGB) "Adriano Buzzati-Traverso", Consiglio Nazionale Delle Ricerche (CNR), 80131, Naples, Italy.
Clinical epigenetics
|October 4, 2025
概括
贝克威特-维德曼综合征 (BWS) 患者的多位印记障碍 (MLID) 与孕产妇效应基因变异和潜在的老化卵细胞有关. 这些干扰导致广泛的,可变的DNA甲基化变化,影响印制和非印制基因.
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.
- 发展生物学 发展生物学
背景情况:
- 印制基因表达依赖于在生殖线差异甲基化区域 (gDMRs) 的差异性DNA甲基化.
- 贝克威斯-维德曼综合征 (BWS) 通常是由KCNQ1OT1-TSSgDMR (IC2LoM) 的甲基化损失引起的.
- 多部位印记障碍 (MLID) 影响约三分之一的IC2LoM的BWS患者,可能与卵细胞皮下母体复合体 (SCMC) 变异有关.
研究的目的:
- 研究IC2LoM的BWS患者的全基因组DNA甲基化模式.
- 确定导致MLID的遗传和表观遗传因素.
- 探索MLID对印制和非印制物体的影响.
主要方法:
- 使用Infinium EPIC甲基化阵列进行全基因组CpG甲基化分析.
- 在BWS患者 (n=64) 和对照组 (n=37) 之间比较甲基化概况.
- 在BWS患者的母亲中,对母性效应基因的基因定型,包括SCMC基因.
主要成果:
- 确定了两组患者:一个是24 gDMR的可变甲基化 (MLID组),另一个是单位IC2LoM.
- 患有MLID患者的母亲有更多的母性影响基因变异,包括50%的SCMC基因变异,并且年龄较大.
- 在MLID患者中,在非印记基位的数千个CpG中显示出甲基化变异性,包括原卡德林和癌症相关基因.
- 多个受影响的兄弟姐妹和反复流产与双基母效应SCMC基因变异有关.
结论:
- 在BWS中的MLID的特点是,在整个基因组中发生广泛的随机甲基化变化.
- MLID可能是母亲效应基因,环境因素和老化的卵细胞之间的相互作用造成的.
- 需要进一步的研究,以了解这些表的长期健康影响.
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