致死性常染色体隐性多囊肾病的PKHD1基因22外显子纯合错义突变

IF 0.3 Q4 PEDIATRICS
Sajina Sathyan, Femitha Pournami, G. Madhavilatha, Amrita Tuteja, Anand Nandakumar, Jyothi Prabhakar, Naveen Jain
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引用次数: 0

摘要

常染色体隐性多囊肾病,被称为先天性肝肾纤维囊性综合征,是儿童终末期肾衰竭的重要遗传原因,据报道发病率为2万分之一。临床范围很广。产前超声肾形肾脏肿大伴有严重羊水少的宫内肾功能衰竭的证据是典型的。产后疾病的范围从新生儿肺发育不全引起的致命呼吸衰竭到儿童慢性肾病,或后来出现导管板畸形和门静脉高压症。遗传诊断技术的进步使基因型识别成为可能。我们报道了ppkd1基因22外显子上的一个新的纯合错义变异(chr6:51915067G > a;c.2167C >t),导致密码子723处半胱氨酸取代精氨酸(p.Arg723Cys)。受影响的新生儿表现为产前羊水无,典型的放射学特征,以及可能由肺发育不全引起的严重缺氧性呼吸衰竭和死亡。双亲为杂合携带者。先证者中特异性变异的检测有助于下次妊娠的产前调查。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Homozygous Missense Mutation on Exon 22 of PKHD1 Gene Causing Fatal Autosomal Recessive Polycystic Kidney Disease
Abstract Autosomal recessive polycystic kidney disease, described as a congenital hepatorenal fibrocystic syndrome, is a significant inherited cause of end stage renal failure in children with reported incidence of 1 in 20,000 live births. The clinical spectrum is wide. Antenatal findings of echogenic reniform enlarged kidneys associated with evidence of intrauterine renal failure in the form of severe oligoamnios are pathognomonic. Postnatal illness ranges from fatal respiratory failure due to pulmonary hypoplasia in neonates to chronic kidney disease in children, or later presentation of ductal plate malformation and portal hypertension. Advances in genetic diagnostic techniques have allowed recognition of genotypes. We report a novel homozygous missense variant on exon 22 of PKHD1 gene (chr6:51915067G > A; c.2167C > T) that results in the amino acid substitution of cysteine for arginine at codon 723 (p.Arg723Cys). The affected neonate presented with antenatal anhydramnios, classical radiological features, and severe hypoxic respiratory failure likely due to pulmonary hypoplasia and succumbed. The parents were found to be heterozygous carriers. Detection of the specific variant in the proband facilitated prenatal investigation in the next pregnancy.
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