Case Report: A Novel In-Frame Deletion of GLIS2 Leading to Nephronophthisis and Early Onset Kidney Failure.

Case Report: A Novel In-Frame Deletion of GLIS2 Leading to Nephronophthisis and Early Onset Kidney Failure.
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DOI:
10.3389/fgene.2021.791495
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发表时间:
2021
影响因子:
3.7
通讯作者:
Sayer JA
Sayer JA
中科院分区:
生物学3区
文献类型:
--
作者:
Al Alawi I;Powell L;Rice SJ;Al Riyami MS;Al-Riyami M;Al Salmi I;Sayer JA

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GLIS 家族锌指蛋白 2 (GLIS2) 的变体是肾结核相关纤毛病 (NPHP-RC) 的罕见原因。尿浓度降低和进行性慢性肾小管间质性肾病伴皮质髓质囊肿是 NPHP 的主要特征。 NPHP 表现出表型和遗传异质性,至少有 25 个不同的隐性基因与该疾病相关。我们报告了一名来自近亲家庭的女性,她在 9 岁时就出现肾脏回声强,伴有皮质髓质分化丧失和进行性慢性肾病,并在 10 岁时达到肾衰竭。使用与每个亲本分离的全外显子组测序 (WES) 鉴定了 GLIS2 中新的纯合框内缺失 (NM_032,575.3: c.560_574delACCATGTCAACGATT, p.H188_Y192del)。五个氨基酸缺失破坏了 GLIS2 锌指基序的 α 螺旋,预计该蛋白质会发生错误折叠,从而导致其致病性。这项研究拓宽了导致 NPHP-RC 的 GLIS2 变体的变体谱。 WES 是一种适合提示 NPHP-RC 肾衰竭儿童的分子工具,并且应该成为不明原因肾衰竭常规诊断的一部分,尤其是在近亲家庭中。
Variants in the GLIS family zinc finger protein 2 (GLIS2) are a rare cause of nephronophthisis-related ciliopathies (NPHP-RC). A reduction in urinary concentration and a progressive chronic tubulointerstitial nephropathy with corticomedullary cysts are the major characteristic features of NPHP. NPHP demonstrates phenotypic and genetic heterogeneity with at least 25 different recessive genes associated with the disease. We report a female, from a consanguineous family, who presented age 9 years with echogenic kidneys with loss of cortico-medullary differentiation and progressive chronic kidney disease reaching kidney failure by 10 years of age. A novel homozygous in-frame deletion (NM_032,575.3: c.560_574delACCATGTCAACGATT, p.H188_Y192del) in GLIS2 was identified using whole exome sequencing (WES) that segregated from each parent. The five amino acid deletion disrupts the alpha-helix of GLIS2 zinc-finger motif with predicted misfolding of the protein leading to its predicted pathogenicity. This study broadens the variant spectrum of GLIS2 variants leading to NPHP-RC. WES is a suitable molecular tool for children with kidney failure suggestive of NPHP-RC and should be part of routine diagnostics in kidney failure of unknown cause, especially in consanguineous families.
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