罕见剂量异常 - 副本数量变异 横跨Shox基因
I Gherlan1,2, E Braha3, D C Manole1
1Pediatric Endocrinology Department, "C.I. Parhon" National Institute of Endocrinology Bucharest, Romania.
概括
下游SHOX增强剂中的遗传重复与特异性矮身 (ISS) 有关. 罗马尼亚患者的这些发现突出了矮身的潜在原因,需要进一步研究确切的临床机制.
科学领域:
- 遗传学 遗传学 是一个
- 内分泌学 在内分泌学.
- 分子生物学分子生物学
背景情况:
- 在SHOX基因中的分子缺陷会导致各种矮身疾病,包括Léri-Weill异构造症,Langer mesomelic发育不良症,特纳综合征和异常矮身 (ISS).
- 据报道,SHOX基因旁边的保存非编码元素 (CNEs) 的重复发生,但它们的临床意义尚不清楚.
研究的目的:
- 调查SHOX下游监管区域中重复的作用,这些重复的作用在体型矮小,生长激素 (GH) 和类似胰岛素的生长因子1 (IGF1) 水平正常的患者身上.
- 报告与罗马尼亚下游SHOX增强剂大量重复相关的ISS的第一个病例.
主要方法:
- 分析了两个具有正常GH-IGF1状态的矮身病例.
- 使用多重结合依赖探针放大 (MLPA) 和数组比较基因组杂交 (arrayCGH) 来检测遗传变化.
- 分析包括对下游SHOX CNEs内部重复的描述.
主要成果:
- 发现这两名患者在SHOX基因下游区域,特别是CNE (包括CNE8,CNE9,CNE4,CNE5,CNE6和ECR1) 中都有异构复制.
- 一名患者从母亲那里继承了这种复制.
- 这些重复涉及对基因调节至关重要的保存的非编码 cis-regulatory DNA 元素 (CNEs).
结论:
- 在SHOX基因下游非编码调节区域内的重复被认为是导致矮身的潜在原因.
- 这些发现代表了罗马尼亚首次报告的ISS病例,其中下游SHOX增强器CNE大量重复.
- 需要进一步的研究来阐明表型后果的全部范围以及这些遗传变化的临床表达背后的精确机制.
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