当前位置: X-MOL 学术J. Hum. Genet. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Molecular mechanisms determining severity in patients with Pierson syndrome.
Journal of Human Genetics ( IF 2.6 ) Pub Date : 2020-01-21 , DOI: 10.1038/s10038-019-0715-0
Shogo Minamikawa 1 , Saori Miwa 2 , Tetsuji Inagaki 3 , Kei Nishiyama 4 , Hiroshi Kaito 1 , Takeshi Ninchoji 1 , Tomohiko Yamamura 1 , China Nagano 1 , Nana Sakakibara 1 , Shingo Ishimori 1 , Shigeo Hara 5 , Norishige Yoshikawa 6 , Daishi Hirano 2 , Ryoko Harada 7 , Riku Hamada 7 , Natsuki Matsunoshita 8 , Michio Nagata 9 , Yuko Shima 10 , Koichi Nakanishi 11 , Hiroaki Nagase 1 , Hiroki Takeda 1 , Naoya Morisada 1 , Kazumoto Iijima 1 , Kandai Nozu 1
Affiliation  

Null variants in LAMB2 cause Pierson syndrome (PS), a severe congenital nephrotic syndrome with ocular and neurological defects. Patients' kidney specimens show complete negativity for laminin β2 expression on glomerular basement membrane (GBM). In contrast, missense variants outside the laminin N-terminal (LN) domain in LAMB2 lead to milder phenotypes. However, we experienced cases not showing these typical genotype-phenotype correlations. In this paper, we report six PS patients: four with mild phenotypes and two with severe phenotypes. We conducted molecular studies including protein expression and transcript analyses. The results revealed that three of the four cases with milder phenotypes had missense variants located outside the LN domain and one of the two severe PS cases had a homozygous missense variant located in the LN domain; these variant positions could explain their phenotypes. However, one mild case possessed a splicing site variant (c.3797 + 5G>A) that should be associated with a severe phenotype. Upon transcript analysis, this variant generated some differently sized transcripts, including completely normal transcript, which could have conferred the milder phenotype. In one severe case, we detected the single-nucleotide substitution of c.4616G>A located outside the LN domain, which should be associated with a milder phenotype. However, we detected aberrant splicing caused by the creation of a novel splice site by this single-base substitution. These are novel mechanisms leading to an atypical genotype-phenotype correlation. In addition, all four cases with milder phenotypes showed laminin β2 expression on GBM. We identified novel mechanisms leading to atypical genotype-phenotype correlation in PS.

中文翻译:

确定Pierson综合征患者严重程度的分子机制。

LAMB2中的零变异会导致Pierson综合征(PS),这是一种严重的先天性肾病综合征,具有眼和神经功能缺损。患者的肾脏标本显示肾小球基底膜(GBM)上层粘连蛋白β2表达完全阴性。相比之下,LAMB2中层粘连蛋白N末端(LN)域外部的错义变体导致较轻的表型。但是,我们遇到的案例并未显示出这些典型的基因型与表型的相关性。在本文中,我们报告了六名PS患者:四名轻度表型和两名重度表型。我们进行了分子研究,包括蛋白质表达和转录本分析。结果显示,在四例具有较轻表型的病例中,有三例的错义变体位于LN结构域之外,而在两例严重的PS病例中,有一例的纯合性错义变体位于LN结构域中。这些变异的位置可以解释它们的表型。然而,一例轻度病例具有剪接位点变体(c.3797 + 5G> A),应与严重的表型相关。通过转录本分析,该变体产生了一些不同大小的转录本,包括完全正常的转录本,这可能赋予了较温和的表型。在一个严重的案例中,我们检测到位于LN结构域外部的c.4616G> A的单核苷酸取代,这应该与较温和的表型有关。但是,我们检测到由这种单碱基取代产生的新型剪接位点引起的异常剪接。这些是导致非典型基因型-表型相关性的新颖机制。另外,所有四例表型较轻的患者在GBM上均表现出层粘连蛋白β2的表达。
更新日期:2020-01-21
down
wechat
bug