A Novel NALCN Homozygote Variant in Non-related Infants with IHPRF1 Syndrome: A Report of 2 Cases

IF 0.4 4区 医学 Q4 PEDIATRICS
S. Ahmadipour, Golnaz Mahmoudvand, Arshia Fakouri, Simin Farokhi, A. Karimi Rouzbahani
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Abstract

Introduction: Sodium leak channel, non-selective (NALCN) is an ion channel with an important function in neuronal excitability. The activity of NALCN is essential in the balance of rhythmic behaviors. Infantile hypotonia with psychomotor retardation and characteristic facies 1 (IHPRF1), which occurs due to biallelic NALCN variants, leads to dysmorphic characteristics and global developmental delay. We hereby report 2 non-related patients with IHPRF1 syndrome. Case Presentation: The first case was a 1 - year-old girl referred to our center because of constipation and poor weight gain, and the other was a 2 - year-old girl presenting with hypotonia, constipation, and poor weight gain. Whole exome sequencing led to the detection of homozygote NALCN variants. Interestingly, in both cases, a novel variant of c.1434 + 1G>A in NACLN was identified, which, to the best of our knowledge, has not been reported as a pathogenic variant so far. Conclusions: NALCN dysfunctions lead to rare yet clinically significant disorders. Due to the potential mortality, further studies are essential for a more comprehensive understanding of these rare disorders.
一种新的NALCN纯合子变异在IHPRF1综合征的非相关婴儿中:附2例报告
非选择性钠离子泄漏通道(NALCN)是一种对神经元兴奋性起重要作用的离子通道。NALCN的活动在节律行为的平衡中是必不可少的。由于双等位基因NALCN变异,婴儿低张力伴精神运动迟缓和特征相1 (IHPRF1),导致畸形特征和整体发育迟缓。我们在此报告2例与IHPRF1综合征无关的患者。病例介绍:第一个病例是一名1岁的女孩,因为便秘和体重增加不佳而转介到我们中心,另一个是一名2岁的女孩,表现为张力不足、便秘和体重增加不佳。全外显子组测序检测到纯合子NALCN变异。有趣的是,在这两种情况下,在NACLN中发现了c.1434 + 1G> a的新变体,据我们所知,到目前为止还没有作为致病变体的报道。结论:NALCN功能障碍导致罕见但具有临床意义的疾病。由于潜在的死亡率,进一步的研究对于更全面地了解这些罕见疾病是必不可少的。
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来源期刊
CiteScore
0.90
自引率
20.00%
发文量
75
审稿时长
6-12 weeks
期刊介绍: Iranian Journal of Pediatrics (Iran J Pediatr) is a peer-reviewed medical publication. The purpose of Iran J Pediatr is to increase knowledge, stimulate research in all fields of Pediatrics, and promote better management of pediatric patients. To achieve the goals, the journal publishes basic, biomedical, and clinical investigations on prevalent diseases relevant to pediatrics. The acceptance criteria for all papers are the quality and originality of the research and their significance to our readership. Except where otherwise stated, manuscripts are peer-reviewed by minimum three anonymous reviewers. The Editorial Board reserves the right to refuse any material for publication and advises that authors should retain copies of submitted manuscripts and correspondence as the material cannot be returned. Final acceptance or rejection rests with the Editors.
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