在产前检测到的11p15.5 ICR1的母性遗传部分重复,导致表型在婴儿期重叠拉塞尔-银综合征
Amanda Thomas-Wilson1, Mythily Ganapathi2, Nina Harkavy3
1Molecular Diagnostics, New York Genome Center, New York, New York, USA.
Prenatal diagnosis
|June 13, 2025
概括
通过基因组测序确定的11p15.5染色体中的罕见重复与类似于拉塞尔-银综合征的生长障碍有关. 这一发现凸显了基因组印记在发育中的作用.
科学领域:
- 遗传学 是一个遗传学.
- 发展生物学 发展生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
背景情况:
- 基因组印记涉及控制基因表达的差异甲基化区域 (DMR).
- 染色体11p15.5的DMR与贝克维特-维德曼综合征 (BWS) 和拉塞尔-银综合征 (RSS) 有关.
- 了解这些DMR对于诊断和管理生长障碍至关重要.
研究的目的:
- 通过基因组测序确定的11p15.5染色体的母性遗传重复的研究.
- 分析复制区域内的印记控制区域 (ICR) 的甲基化状态.
- 为了将遗传发现与胎儿和家庭成员观察到的表型相关联.
主要方法:
- 基因组测序 (GS) 用于识别基因变异.
- 对胎儿细胞和母亲白细胞进行了甲基化研究.
- 进行了胎儿的表型评估和家族史评估.
主要成果:
- 在11p15.5确定了约281kb的重复,包括印记控制区域1 (ICR1) 和H19基因.
- 在胎儿细胞和母亲中观察到ICR1的低甲基化,而祖母则显示出高甲基化.
- 胎儿的生长速度有所减缓,表型与拉塞尔-银综合征重叠.
结论:
- 11p15.5区域的部分重复会导致生长障碍,表型类似于拉塞尔-银综合征.
- 基因组测序对于检测与印记障碍相关的DMRs是有效的.
- 这一案例扩大了对11p15.5印记障碍中的基因型-表型相关性的理解.
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