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Mono-symptomatic Fabry disease in a population with mild-to-moderate left ventricular hypertrophy
Molecular Genetics and Metabolism Reports ( IF 1.9 ) Pub Date : 2020-12-10 , DOI: 10.1016/j.ymgmr.2020.100697
Maria Fuller , Rebecca Perry , Madiha Saiedi , Janice M. Fletcher , Joseph B. Selvanayagam

Fabry disease (FD) results from a deficiency in the exoglycohydrolase, α-galactosidase A (AGA), an enzyme required for the sequential degradation of glycosphingolipids, which consequently accumulate in the lysosomes of affected cells. An X-linked inherited metabolic disorder, FD has a high incidence of a later onset phenotype that is under-diagnosed and under-recognised in adulthood despite the availability of specific treatment. As the first presenting feature in adults is often left ventricular hypertrophy (LVH), we hypothesized that testing patients with an attenuated echocardiographic phenotype of unexplained hypertrophic cardiomyopathy, might identify cases of undiagnosed FD. We employed a simple screening test by measuring AGA activity in dried blood spots collected from a finger-prick of blood in a cohort of 511 individuals aged between 18 and 75 with LVH between 1.2 and 1.5 cm. Two males were identified with AGA activity below the reference interval and subsequent molecular testing confirmed the commonly reported genetic variants, p.Ala143Thr in one individual and p.Asn215Ser, in the other. Additional biochemical measurement of plasma, lyso-Gb1 was normal in both patients. Of the 179 females screened, one individual returned AGA activity slightly below the reference interval but was lost to further follow-up. This pilot study suggests that screening patients with mild-to-moderate LVH of unknown aetiology does indeed identify undiagnosed cases of FD.



中文翻译:

轻度至中度左心室肥大人群中的单症状法布里病

法布里病(FD)是由糖外水解酶α-半乳糖苷酶A(AGA)缺乏引起的,α-半乳糖苷酶A是糖鞘脂顺序降解所需的酶,因此会在受影响细胞的溶酶体中积聚。FD是一种X连锁遗传性代谢障碍,尽管有特殊治疗方法,但其成年后表型的发病率很高,该表型在成年期仍被诊断不足和认识不足。由于成人的首发表现通常是左心室肥大(LVH),因此我们假设测试患有无法解释的肥厚型心肌病的超声心动图表现型减弱的患者,可能会发现未确诊的FD病例。我们通过测量511名年龄在18至75岁,LVH在1.2至1.5 cm之间的人群中从手指采血中采集的干血斑中的AGA活性,采用了一项简单的筛选测试。鉴定出两名男性具有低于参考区间的AGA活性,随后的分子测试证实了共同报告的遗传变异,其中一个个体为p.Ala143Thr,另一个体为p.Asn215Ser。两名患者的血浆溶血Gb1的其他生化测量均正常。在被筛查的179名女性中,有1个人的AGA活性略低于参考时间间隔,但又失去了进一步的随访。这项初步研究表明,筛查病因不明的轻度至中度LVH的患者确实的确诊为FD。鉴定出两名男性具有低于参考区间的AGA活性,随后的分子测试证实了共同报告的遗传变异,其中一个个体为p.Ala143Thr,另一个体为p.Asn215Ser。两名患者的血浆溶血Gb1的其他生化测量均正常。在被筛查的179名女性中,有1个人的AGA活性略低于参考间隔,但仍无法继续随访。这项初步研究表明,筛查病因不明的轻度至中度LVH的患者确实的确诊为FD。鉴定出两名男性具有低于参考区间的AGA活性,随后的分子测试证实了共同报告的遗传变异,其中一个个体为p.Ala143Thr,另一个体为p.Asn215Ser。两名患者的血浆溶血Gb1的其他生化测量均正常。在被筛查的179名女性中,有1个人的AGA活性略低于参考时间间隔,但又失去了进一步的随访。这项初步研究表明,筛查病因不明的轻度至中度LVH的患者确实的确诊为FD。在被筛查的179名女性中,有1个人的AGA活性略低于参考时间间隔,但又失去了进一步的随访。这项初步研究表明,筛查病因不明的轻度至中度LVH的患者确实的确诊为FD。在被筛查的179名女性中,有1个人的AGA活性略低于参考时间间隔,但又失去了进一步的随访。这项初步研究表明,筛查病因不明的轻度至中度LVH的患者确实的确诊为FD。

更新日期:2020-12-10
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