Effect of the OPHN1 novel variant c.1025+1 G>A on RNA splicing: insights from a minigene assay.

IF 2.1 4区 医学 Q3 GENETICS & HEREDITY
Fei Yang, Minghui Wang
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引用次数: 0

Abstract

This research analyzes the clinical data, whole-exome sequencing results, and in vitro minigene functional experiments of a child with developmental delay and intellectual disability. The male patient, aged 4, began experiencing epileptic seizures at 3 months post-birth and has shown developmental delay. Rehabilitation training was administered between the ages of one and two. There were no other significant family medical histories. Through comprehensive family exome genetic testing, a hemizygous variant in the 11th exon of the OPHN1 gene was identified in the affected child: c.1025 + 1G > A. Family segregation analysis confirmed the presence of this variant in the patient's mother, which had not been previously reported. According to the ACMG guidelines, this variant was classified as a likely pathogenic variant. In response to this variant, an in vitro minigene functional experiment was designed and conducted, confirming that the mutation affects the normal splicing of the gene's mRNA, resulting in a 56 bp retention on the left side of Intron 11. It was confirmed that OPHN1: c.1025 + 1G > A is the pathogenic cause of X-linked intellectual disabilities in the child, with clinical phenotypes including developmental delay and seizures.

OPHN1 新型变体 c.1025+1 G>A 对 RNA 剪接的影响:微型基因检测的启示。
这项研究分析了一名发育迟缓和智障儿童的临床数据、全外显子组测序结果和体外微型基因功能实验。该男性患者今年 4 岁,出生后 3 个月开始出现癫痫发作,并表现出发育迟缓。一到两岁时接受了康复训练。没有其他重要的家族病史。通过全面的家族外显子组基因检测,发现患儿的 OPHN1 基因第 11 外显子存在一个半杂合子变异:c.1025 + 1G > A。家族分离分析证实,患者的母亲存在这一变异,而这一变异以前从未报道过。根据 ACMG 指南,该变异被归类为可能致病的变异。针对这一变异,研究人员设计并进行了体外微型基因功能实验,证实该变异影响了基因 mRNA 的正常剪接,导致内含子 11 左侧有 56 bp 的保留。结果证实,OPHN1:c.1025 + 1G > A 是该患儿 X 连锁智力障碍的致病原因,临床表现包括发育迟缓和癫痫发作。
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来源期刊
BMC Medical Genomics
BMC Medical Genomics 医学-遗传学
CiteScore
3.90
自引率
0.00%
发文量
243
审稿时长
3.5 months
期刊介绍: BMC Medical Genomics is an open access journal publishing original peer-reviewed research articles in all aspects of functional genomics, genome structure, genome-scale population genetics, epigenomics, proteomics, systems analysis, and pharmacogenomics in relation to human health and disease.
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