大2p染色体重复相关的机制和临床表现
Xiaolan Fang1, Benjamin Hilton1, Katie Clarkson1
1Greenwood Genetic Center, Greenwood, South Carolina, USA.
Cytogenetic and genome research
|July 27, 2023
概括
染色体2p (chr2p) 的大量重复作为唯一异常可能导致发育延迟和独特的特征. 这些重复来自于各种机制,影响基因剂量和临床结果.
科学领域:
- 遗传学 遗传学 是一个
- 临床遗传学 临床遗传学
- 人类遗传学 人类遗传学
背景情况:
- 染色体2p (chr2p) 复制,或三症2p,是一种罕见的疾病,通常与发育迟缓和智力障碍有关.
- 大多数报告的病例涉及多个副本数变异 (CNVs) 并且很小,使得大型chr2p重复的结果作为唯一异常在很大程度上是未知的.
研究的目的:
- 研究作为唯一细胞遗传异常发生的大型chr2p重复的临床结果和遗传机制.
- 确定与这些大量重复相关的共享和独特的临床表现.
主要方法:
- 评估了193个具有chr2p CNV的样本,确定了8名具有大量chr2p重复 (9.3-89 Mb) 且没有其他CNV的患者.
- 复制机制的分析,包括使用微阵列和常规细胞遗传学的倒置,并联和转位相关的复制.
- 在相关情况下,通过光在位杂交 (FISH) 确认转位.
主要成果:
- 八名患者呈现出大量的chr2p重复,作为唯一确定的CNV,由各种机制引起.
- 临床特征包括发育迟缓,半面性缺血症,口腔裂,矮身,低血压,小脑低质生,大脑生.
- 一名患者患有马赛克完整的三发症2p,原因是不平衡的de novo (X;2) 转位.
结论:
- 单个的大型chr2p重复可以通过各种遗传机制发生,包括内染色体重排和转位.
- 这些重复与发育迟缓和特定的临床特征有关,可能是由于基因剂量效应.
- 了解这些大型chr2p重复对于诊断和管理相关的发育和临床问题至关重要.
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