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在PHYH基因中识别新的致病变体,并扩大Refsum病的表型范围
Cheryl Y Gregory-Evans1,2, Anna Lehman2, Andre Mattman3
1Departments of Ophthalmology and Visual Sciences, University of British Columbia, Vancouver, Canada.
Ophthalmic genetics
|November 25, 2025
概括
基因测试发现了PHYH和PHYN的新型变异,证实了两个患有遗传视网膜变的患者的Refsum病. 早期诊断和饮食改变对于管理Refsum病并发症至关重要.
科学领域:
- 眼科医生 眼科 眼科
- 医学遗传学 医学遗传学
- 代谢障碍 代谢障碍 代谢障碍
背景情况:
- 遗传性视网膜发育不良 (IRDs) 包含一组影响视力的遗传性疾病.
- 雷夫瑟姆病是一种罕见的代谢障碍,其特点是植物酸的积累.
- 在Refsum病中,眼部表现很常见,但与黄斑发育不良的特定关联不太了解.
研究的目的:
- 在两名患者身上调查疑似遗传性视网膜变的遗传基础.
- 识别与视网膜疾病相关的新型遗传变异.
- 为了确定黄斑缩和雷弗苏姆病之间的潜在联系.
主要方法:
- 眼科检查和转诊进行基因检测.
- 分子遗传分析用于识别相关基因中的致病变体.
- 生物化学测试以测量植物酸水平用于Refsum病诊断.
主要成果:
- 患者1 (P1) 呈现 retinitis pigmentosa,并被发现具有PHYH的新型致病变体.
- 患者2 (P2) 呈现斑点色素变化,并且在PHYN中出现了新的变异.
- 两位患者均表现出高酸水平,证实了Refsum病,并具有共同的全身特征.
结论:
- 这项研究首次报告了黄斑发育不良和Refsum病之间的关联.
- 在PHYH和PHYN中对变异的遗传鉴定有助于了解IRDs的遗传景观.
- 早期诊断Refsum病允许饮食修改以改善预后,尽管视觉恢复可能有限.
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