NESP55/NESPAS中的复发性小变异与广泛的GNAS甲基化缺陷和假性甲状旁腺功能减退症1b型有关

IF 6.3 1区 医学 Q1 MEDICINE, RESEARCH & EXPERIMENTAL
Dong Li, Suzanne Jan de Beur, Cuiping Hou, Maura Rz Ruzhnikov, Hilary Seeley, Garry R Cutting, Molly B Sheridan, Michael A Levine
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引用次数: 0

摘要

假性甲状旁腺功能减退症1B型(PHP1B)与印记GNAS基因母系等位基因的表观遗传变化有关,这种变化抑制了Gs(Gsα)α亚基的表达,从而导致肾近曲小管细胞对甲状旁腺激素产生抗性,而父系GNAS等位基因的Gs 的表达通常是沉默的。尽管所有 PHP1B 患者的外显子 A/B 不同甲基化区(DMR)都显示出甲基化缺失,但一些常染色体显性 PHP1B 患者(AD-PHP1B)和大多数散发性 PHP1B 患者都有额外的甲基化缺陷,这些缺陷会影响与 XL、AS1 和 NESP 外显子相对应的 DMR。由于大多数患者的基因缺陷不明,我们试图在两个具有广泛 GNAS 甲基化缺陷和阴性临床外显子的多代家族中找出 AD-PHP1B 的潜在遗传基础。基因组测序在每个家族中都发现了小的 GNAS 变异,这些变异也出现在复制队列中与 PHP1B 无关的受试者中。一个 GNAS 小缺失的母系传递在一些未受影响的患者中显示出较低的渗透性。在受影响患者的细胞中,AS 转录物的表达增加,NESP 表达减少。这些结果表明,小缺失激活了 AS 的转录,导致 NESP DMR 甲基化,从而抑制了 NESP 的转录,从而为 PHP1B 提供了一种潜在的机制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Recurrent small variants in NESP55/NESPAS associated with broad GNAS methylation defects and pseudohypoparathyroidism type 1B.

Pseudohypoparathyroidism type 1B (PHP1B) is associated with epigenetic changes in the maternal allele of the imprinted GNAS gene that inhibit expression of the α subunit of Gs (Gsα), thereby leading to parathyroid hormone resistance in renal proximal tubule cells where expression of Gsα from the paternal GNAS allele is normally silent. Although all patients with PHP1B show loss of methylation for the exon A/B differentially methylated region (DMR), some patients with autosomal dominant PHP1B (AD-PHP1B) and most patients with sporadic PHP1B have additional methylation defects that affect the DMRs corresponding to exons XL, AS1, and NESP. Because the genetic defect is unknown in most of these patients, we sought to identify the underlying genetic basis for AD-PHP1B in 2 multigenerational families with broad GNAS methylation defects and negative clinical exomes. Genome sequencing identified small GNAS variants in each family that were also present in unrelated individuals with PHP1B in a replication cohort. Maternal transmission of one GNAS microdeletion showed reduced penetrance in some unaffected patients. Expression of AS transcripts was increased, and NESP was decreased, in cells from affected patients. These results suggest that the small deletion activated AS transcription, leading to methylation of the NESP DMR with consequent inhibition of NESP transcription, and thereby provide a potential mechanism for PHP1B.

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来源期刊
JCI insight
JCI insight Medicine-General Medicine
CiteScore
13.70
自引率
1.20%
发文量
543
审稿时长
6 weeks
期刊介绍: JCI Insight is a Gold Open Access journal with a 2022 Impact Factor of 8.0. It publishes high-quality studies in various biomedical specialties, such as autoimmunity, gastroenterology, immunology, metabolism, nephrology, neuroscience, oncology, pulmonology, and vascular biology. The journal focuses on clinically relevant basic and translational research that contributes to the understanding of disease biology and treatment. JCI Insight is self-published by the American Society for Clinical Investigation (ASCI), a nonprofit honor organization of physician-scientists founded in 1908, and it helps fulfill the ASCI's mission to advance medical science through the publication of clinically relevant research reports.
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