在M频段编码外子中的双切断TTN变体会导致胎儿致命的滴病变
Ming-Wei Li1, Fan Li1, Zhen-Xing Cheng2
1Department of Obstetrics and Gynecology, The First Affiliated Hospital of Anhui University of Science and Technology, Huainan, Anhui, China.
Prenatal diagnosis
|December 26, 2023
概括
这项研究确定了两种新的TTN基因变异,导致胎儿衰退型头病,扩大了这种疾病的已知遗传原因. 这些发现扩大了对TTN相关疾病及其临床表现的理解.
科学领域:
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
- 儿童心脏病学 儿童心脏病学
背景情况:
- 蒂 (TTN) 基因突变是遗传性心肌病和肌肉疾病的重要原因.
- 胎儿衰退型头病是一种严重的疾病,其特征是早期开始的肌肉功能障碍.
- 扩大TTN变异的频谱对于准确的诊断和遗传咨询至关重要.
研究的目的:
- 报告两种与胎儿衰退型头病变相关的新型TTN变异.
- 扩大TTN变异的频谱涉及到titinopathy. 为了扩大TTN变异的范围.
- 描述这些新型变异的胎儿的临床表现.
主要方法:
- 从胎儿和父母收集临床数据.
- 从胎儿组织和父母血液中提取基因组DNA.
- 在胎儿DNA上进行全外体序列 (WES) 测序.
- 生物信息学分析以识别变异.
- 桑格测序用于变种确认.
- 产前超声波评估.
主要成果:
- 一个胎儿呈现出胎儿水,胎儿运动减弱,多重关节收缩和多水,导致子宫内胎儿死亡.
- 外基因测序确定了TTN基因中的复合异构体变体:c.101227C>T (p.Arg33743Ter) 和c.104254C>T (p.Gln34752Ter).
- 这些变异是新型的,以复合异合体的方式 (父性和母性) 遗传,并被归类为可能致病的.
结论:
- 这份报告描述了一位患有hydrops fetalis和arthrogryposis multiplex congenita的胎儿,这是由于新型化合物异构性TTN变体而产生的.
- 这些发现扩大了已知的TTN相关疾病的临床和遗传景观.
- 对TTN变异的进一步研究对于改善诊断和对titinopathies的理解至关重要.
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