研究"黑暗"基因组:在塞浦路斯首次报告了帕廷顿综合征
Constantia Aristidou1, Athina Theodosiou2, Pavlos Antoniou2,3
1Department of Clinical Genetics and Genomics, The Cyprus Institute of Neurology and Genetics, 2371 Nicosia, Cyprus.
Genes
|October 29, 2025
概括
研究人员在一个X链接智力障碍 (XLID) 的家庭中发现了一种新的ARX基因变异 (ARXdup24). 这一发现解决了诊断奥德赛,并强调了分析XLID病例中代表性不足的基因组区域的重要性.
科学领域:
- 遗传学和基因组学 遗传学和基因组学
- 神经发育障碍 神经发育障碍
- 人类分子遗传学
背景情况:
- 与X相关的智力障碍 (XLID) 是男性智力障碍的重要原因,其特点是遗传异质性.
- 尽管下一代测序 (NGS) 取得了进展,但许多XLID病例仍未在遗传上得到解决.
- 一个四代人的家庭呈现了综合征性XLID,可变智力障碍,焦点 dystonia 和.
研究的目的:
- 在一个具有复杂表型的多个受影响家庭中确定XLID的遗传原因.
- 调查在全外体测序 (WES) 和全基因组测序 (WGS) 数据中重新分析代表性不足的基因组区域的实用性.
- 为了确定一个新发现的变种的基因型-表型相关性.
主要方法:
- 最初的诊断评估包括细胞遗传和向遗传测试.
- 进行了全外基因组测序 (WES) 和短读全基因组测序 (WGS).
- 重新分析了测序数据,重点关注X染色体 (chrX) 覆盖较差的区域. 以表型驱动的工具 (Phenomizer) 被用来优先考虑候选基因.
- 使用桑格测序进行了变异验证和分离分析.
主要成果:
- 标准诊断和NGS分析没有产生诊断.
- 在chrX上手动检查覆盖范围较低的区域时,发现了一种复发性致病性ARX变体,NM_139058.3:c.441_464dup p.
- 在所有受影响的男性中确定了ARXdup24,并且在未受影响的母亲中确认了载体状态,与XLID表型分离,包括帕廷顿综合征.
- 这种变体以前与综合征性和非综合征性XLID有关.
结论:
- 发现了致病性ARXdup24变种,解决了该家族长期存在的诊断挑战.
- 这项研究确定了塞浦路斯首个报告的帕廷顿综合征家族,表明了明显的基因型-表型相关性.
- 在测序数据中重新评估代表性不足的基因组区域对于诊断像XLID这样的复杂遗传疾病至关重要.
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